/*
 * The contents of this file are subject to the terms of the Common Development and
 * Distribution License (the License). You may not use this file except in compliance with the
 * License.
 *
 * You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
 * specific language governing permission and limitations under the License.
 *
 * When distributing Covered Software, include this CDDL Header Notice in each file and include
 * the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
 * Header, with the fields enclosed by brackets [] replaced by your own identifying
 * information: "Portions Copyright [year] [name of copyright owner]".
 *
 * Copyright 2006-2010 Sun Microsystems, Inc.
 * Portions Copyright 2011-2016 ForgeRock AS.
 */
package org.opends.server.core;

import static org.opends.messages.ConfigMessages.*;
import static org.opends.messages.PluginMessages.*;
import static org.opends.server.util.StaticUtils.*;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import java.util.StringTokenizer;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.locks.ReentrantLock;

import org.forgerock.i18n.LocalizableMessage;
import org.forgerock.i18n.LocalizableMessageDescriptor.Arg4;
import org.forgerock.i18n.LocalizableMessageDescriptor.Arg5;
import org.forgerock.i18n.slf4j.LocalizedLogger;
import org.forgerock.opendj.config.server.ConfigChangeResult;
import org.forgerock.opendj.config.server.ConfigException;
import org.forgerock.opendj.ldap.DN;
import org.forgerock.opendj.ldap.ResultCode;
import org.forgerock.util.Utils;
import org.opends.server.admin.ClassPropertyDefinition;
import org.opends.server.admin.server.ConfigurationAddListener;
import org.opends.server.admin.server.ConfigurationChangeListener;
import org.opends.server.admin.server.ConfigurationDeleteListener;
import org.opends.server.admin.server.ServerManagementContext;
import org.opends.server.admin.std.meta.PluginCfgDefn;
import org.opends.server.admin.std.server.PluginCfg;
import org.opends.server.admin.std.server.PluginRootCfg;
import org.opends.server.admin.std.server.RootCfg;
import org.opends.server.api.ClientConnection;
import org.opends.server.api.plugin.DirectoryServerPlugin;
import org.opends.server.api.plugin.InternalDirectoryServerPlugin;
import org.opends.server.api.plugin.PluginResult;
import org.opends.server.api.plugin.PluginType;
import org.opends.server.types.CanceledOperationException;
import org.opends.server.types.DisconnectReason;
import org.opends.server.types.Entry;
import org.opends.server.types.InitializationException;
import org.opends.server.types.IntermediateResponse;
import org.opends.server.types.LDIFExportConfig;
import org.opends.server.types.LDIFImportConfig;
import org.opends.server.types.Modification;
import org.opends.server.types.Operation;
import org.opends.server.types.SearchResultEntry;
import org.opends.server.types.SearchResultReference;
import org.opends.server.types.operation.PluginOperation;
import org.opends.server.types.operation.PostOperationAbandonOperation;
import org.opends.server.types.operation.PostOperationAddOperation;
import org.opends.server.types.operation.PostOperationBindOperation;
import org.opends.server.types.operation.PostOperationCompareOperation;
import org.opends.server.types.operation.PostOperationDeleteOperation;
import org.opends.server.types.operation.PostOperationExtendedOperation;
import org.opends.server.types.operation.PostOperationModifyDNOperation;
import org.opends.server.types.operation.PostOperationModifyOperation;
import org.opends.server.types.operation.PostOperationSearchOperation;
import org.opends.server.types.operation.PostOperationUnbindOperation;
import org.opends.server.types.operation.PostResponseAddOperation;
import org.opends.server.types.operation.PostResponseBindOperation;
import org.opends.server.types.operation.PostResponseCompareOperation;
import org.opends.server.types.operation.PostResponseDeleteOperation;
import org.opends.server.types.operation.PostResponseExtendedOperation;
import org.opends.server.types.operation.PostResponseModifyDNOperation;
import org.opends.server.types.operation.PostResponseModifyOperation;
import org.opends.server.types.operation.PostResponseSearchOperation;
import org.opends.server.types.operation.PostSynchronizationAddOperation;
import org.opends.server.types.operation.PostSynchronizationDeleteOperation;
import org.opends.server.types.operation.PostSynchronizationModifyDNOperation;
import org.opends.server.types.operation.PostSynchronizationModifyOperation;
import org.opends.server.types.operation.PreOperationAddOperation;
import org.opends.server.types.operation.PreOperationBindOperation;
import org.opends.server.types.operation.PreOperationCompareOperation;
import org.opends.server.types.operation.PreOperationDeleteOperation;
import org.opends.server.types.operation.PreOperationExtendedOperation;
import org.opends.server.types.operation.PreOperationModifyDNOperation;
import org.opends.server.types.operation.PreOperationModifyOperation;
import org.opends.server.types.operation.PreOperationOperation;
import org.opends.server.types.operation.PreOperationSearchOperation;
import org.opends.server.types.operation.PreParseAbandonOperation;
import org.opends.server.types.operation.PreParseAddOperation;
import org.opends.server.types.operation.PreParseBindOperation;
import org.opends.server.types.operation.PreParseCompareOperation;
import org.opends.server.types.operation.PreParseDeleteOperation;
import org.opends.server.types.operation.PreParseExtendedOperation;
import org.opends.server.types.operation.PreParseModifyDNOperation;
import org.opends.server.types.operation.PreParseModifyOperation;
import org.opends.server.types.operation.PreParseOperation;
import org.opends.server.types.operation.PreParseSearchOperation;
import org.opends.server.types.operation.PreParseUnbindOperation;
import org.opends.server.types.operation.SearchEntrySearchOperation;
import org.opends.server.types.operation.SearchReferenceSearchOperation;
import org.opends.server.types.operation.SubordinateModifyDNOperation;

/**
 * This class defines a utility that will be used to manage the configuration
 * for the set of plugins defined in the Directory Server.  It will perform the
 * necessary initialization of those plugins when the server is first started,
 * and then will manage any changes to them while the server is running.  It
 * also provides methods for invoking all the plugins of a given type.
 */
public class PluginConfigManager
       implements ConfigurationAddListener<PluginCfg>,
                  ConfigurationDeleteListener<PluginCfg>,
                  ConfigurationChangeListener<PluginCfg>
{
  private static final LocalizedLogger logger = LocalizedLogger.getLoggerForThisClass();

  // Arrays for holding the plugins of each type.
  private DirectoryServerPlugin[] startupPlugins;
  private DirectoryServerPlugin[] shutdownPlugins;
  private DirectoryServerPlugin[] postConnectPlugins;
  private DirectoryServerPlugin[] postDisconnectPlugins;
  private DirectoryServerPlugin[] ldifImportPlugins;
  private DirectoryServerPlugin[] ldifImportEndPlugins;
  private DirectoryServerPlugin[] ldifImportBeginPlugins;
  private DirectoryServerPlugin[] ldifExportPlugins;
  private DirectoryServerPlugin[] preParseAbandonPlugins;
  private DirectoryServerPlugin[] preParseAddPlugins;
  private DirectoryServerPlugin[] preParseBindPlugins;
  private DirectoryServerPlugin[] preParseComparePlugins;
  private DirectoryServerPlugin[] preParseDeletePlugins;
  private DirectoryServerPlugin[] preParseExtendedPlugins;
  private DirectoryServerPlugin[] preParseModifyPlugins;
  private DirectoryServerPlugin[] preParseModifyDNPlugins;
  private DirectoryServerPlugin[] preParseSearchPlugins;
  private DirectoryServerPlugin[] preParseUnbindPlugins;
  private DirectoryServerPlugin[] preOperationAddPlugins;
  private DirectoryServerPlugin[] preOperationBindPlugins;
  private DirectoryServerPlugin[] preOperationComparePlugins;
  private DirectoryServerPlugin[] preOperationDeletePlugins;
  private DirectoryServerPlugin[] preOperationExtendedPlugins;
  private DirectoryServerPlugin[] preOperationModifyPlugins;
  private DirectoryServerPlugin[] preOperationModifyDNPlugins;
  private DirectoryServerPlugin[] preOperationSearchPlugins;
  private DirectoryServerPlugin[] postOperationAbandonPlugins;
  private DirectoryServerPlugin[] postOperationAddPlugins;
  private DirectoryServerPlugin[] postOperationBindPlugins;
  private DirectoryServerPlugin[] postOperationComparePlugins;
  private DirectoryServerPlugin[] postOperationDeletePlugins;
  private DirectoryServerPlugin[] postOperationExtendedPlugins;
  private DirectoryServerPlugin[] postOperationModifyPlugins;
  private DirectoryServerPlugin[] postOperationModifyDNPlugins;
  private DirectoryServerPlugin[] postOperationSearchPlugins;
  private DirectoryServerPlugin[] postOperationUnbindPlugins;
  private DirectoryServerPlugin[] postResponseAddPlugins;
  private DirectoryServerPlugin[] postResponseBindPlugins;
  private DirectoryServerPlugin[] postResponseComparePlugins;
  private DirectoryServerPlugin[] postResponseDeletePlugins;
  private DirectoryServerPlugin[] postResponseExtendedPlugins;
  private DirectoryServerPlugin[] postResponseModifyPlugins;
  private DirectoryServerPlugin[] postResponseModifyDNPlugins;
  private DirectoryServerPlugin[] postResponseSearchPlugins;
  private DirectoryServerPlugin[] postSynchronizationAddPlugins;
  private DirectoryServerPlugin[] postSynchronizationDeletePlugins;
  private DirectoryServerPlugin[] postSynchronizationModifyPlugins;
  private DirectoryServerPlugin[] postSynchronizationModifyDNPlugins;
  private DirectoryServerPlugin[] searchResultEntryPlugins;
  private DirectoryServerPlugin[] searchResultReferencePlugins;
  private DirectoryServerPlugin[] subordinateModifyDNPlugins;
  private DirectoryServerPlugin[] subordinateDeletePlugins;
  private DirectoryServerPlugin[] intermediateResponsePlugins;


  /**
   * The mapping between the DN of a plugin entry and the plugin instance loaded
   * from that entry.
   */
  private ConcurrentHashMap<DN,
               DirectoryServerPlugin<? extends PluginCfg>>
                    registeredPlugins;

  /**
   * The mapping between an operation and a set of post operation plugins
   * it should skip. This pairs up pre and post operation plugin processing
   * such that only plugins that successfully execute its pre op plugin will
   * have its post op plugin executed on a per operation basis. If an
   * operation is not registered on this list then all all pre op plugins
   * executed successfully for this operation so all post op plugins should
   * execute.
   */
  private ConcurrentHashMap<PluginOperation, ArrayList<DirectoryServerPlugin>>
      skippedPreOperationPlugins;

  /** The plugin root configuration read at server startup. */
  private PluginRootCfg pluginRootConfig;

  /**
   * The lock that will provide threadsafe access to the sets of registered
   * plugins.
   */
  private ReentrantLock pluginLock;

  private final ServerContext serverContext;

  /**
   * Creates a new instance of this plugin config manager.
   *
   * @param serverContext
   *          The server context.
   */
  public PluginConfigManager(ServerContext serverContext)
  {
    this.serverContext = serverContext;
    pluginLock = new ReentrantLock();

    startupPlugins                     = new DirectoryServerPlugin[0];
    shutdownPlugins                    = new DirectoryServerPlugin[0];
    postConnectPlugins                 = new DirectoryServerPlugin[0];
    postDisconnectPlugins              = new DirectoryServerPlugin[0];
    ldifImportPlugins                  = new DirectoryServerPlugin[0];
    ldifImportEndPlugins               = new DirectoryServerPlugin[0];
    ldifImportBeginPlugins             = new DirectoryServerPlugin[0];
    ldifExportPlugins                  = new DirectoryServerPlugin[0];
    preParseAbandonPlugins             = new DirectoryServerPlugin[0];
    preParseAddPlugins                 = new DirectoryServerPlugin[0];
    preParseBindPlugins                = new DirectoryServerPlugin[0];
    preParseComparePlugins             = new DirectoryServerPlugin[0];
    preParseDeletePlugins              = new DirectoryServerPlugin[0];
    preParseExtendedPlugins            = new DirectoryServerPlugin[0];
    preParseModifyPlugins              = new DirectoryServerPlugin[0];
    preParseModifyDNPlugins            = new DirectoryServerPlugin[0];
    preParseSearchPlugins              = new DirectoryServerPlugin[0];
    preParseUnbindPlugins              = new DirectoryServerPlugin[0];
    preOperationAddPlugins             = new DirectoryServerPlugin[0];
    preOperationBindPlugins            = new DirectoryServerPlugin[0];
    preOperationComparePlugins         = new DirectoryServerPlugin[0];
    preOperationDeletePlugins          = new DirectoryServerPlugin[0];
    preOperationExtendedPlugins        = new DirectoryServerPlugin[0];
    preOperationModifyPlugins          = new DirectoryServerPlugin[0];
    preOperationModifyDNPlugins        = new DirectoryServerPlugin[0];
    preOperationSearchPlugins          = new DirectoryServerPlugin[0];
    postOperationAbandonPlugins        = new DirectoryServerPlugin[0];
    postOperationAddPlugins            = new DirectoryServerPlugin[0];
    postOperationBindPlugins           = new DirectoryServerPlugin[0];
    postOperationComparePlugins        = new DirectoryServerPlugin[0];
    postOperationDeletePlugins         = new DirectoryServerPlugin[0];
    postOperationExtendedPlugins       = new DirectoryServerPlugin[0];
    postOperationModifyPlugins         = new DirectoryServerPlugin[0];
    postOperationModifyDNPlugins       = new DirectoryServerPlugin[0];
    postOperationSearchPlugins         = new DirectoryServerPlugin[0];
    postOperationUnbindPlugins         = new DirectoryServerPlugin[0];
    postResponseAddPlugins             = new DirectoryServerPlugin[0];
    postResponseBindPlugins            = new DirectoryServerPlugin[0];
    postResponseComparePlugins         = new DirectoryServerPlugin[0];
    postResponseDeletePlugins          = new DirectoryServerPlugin[0];
    postResponseExtendedPlugins        = new DirectoryServerPlugin[0];
    postResponseModifyPlugins          = new DirectoryServerPlugin[0];
    postResponseModifyDNPlugins        = new DirectoryServerPlugin[0];
    postResponseSearchPlugins          = new DirectoryServerPlugin[0];
    postSynchronizationAddPlugins      = new DirectoryServerPlugin[0];
    postSynchronizationDeletePlugins   = new DirectoryServerPlugin[0];
    postSynchronizationModifyPlugins   = new DirectoryServerPlugin[0];
    postSynchronizationModifyDNPlugins = new DirectoryServerPlugin[0];
    searchResultEntryPlugins           = new DirectoryServerPlugin[0];
    searchResultReferencePlugins       = new DirectoryServerPlugin[0];
    subordinateModifyDNPlugins         = new DirectoryServerPlugin[0];
    subordinateDeletePlugins           = new DirectoryServerPlugin[0];
    intermediateResponsePlugins        = new DirectoryServerPlugin[0];
    registeredPlugins                  = new ConcurrentHashMap<>();
    skippedPreOperationPlugins = new ConcurrentHashMap<>();
  }



  /**
   * Initializes this plugin configuration manager. This should only be called
   * at Directory Server startup and before user plugins are loaded.
   *
   * @throws ConfigException
   *           If a critical configuration problem prevents the plugin
   *           initialization from succeeding.
   */
  public void initializePluginConfigManager() throws ConfigException
  {
    registeredPlugins.clear();

    // Get the root configuration object.
    ServerManagementContext managementContext =
         ServerManagementContext.getInstance();
    RootCfg rootConfiguration =
         managementContext.getRootConfiguration();

    // Get the plugin root configuration and register with it as an add and
    // delete listener so we can be notified if any plugin entries are added or
    // removed.
    pluginRootConfig = rootConfiguration.getPluginRoot();
    pluginRootConfig.addPluginAddListener(this);
    pluginRootConfig.addPluginDeleteListener(this);
  }



  /**
   * Initializes any plugins defined in the directory server
   * configuration. This should only be called at Directory Server
   * startup and after this plugin configuration manager has been
   * initialized.
   *
   * @param pluginTypes
   *          The set of plugin types for the plugins to initialize, or
   *          <CODE>null</CODE> to initialize all types of plugins
   *          defined in the server configuration. In general, this
   *          should only be non-null for cases in which the server is
   *          running in a special mode that only uses a minimal set of
   *          plugins (e.g., LDIF import or export).
   * @throws ConfigException
   *           If a critical configuration problem prevents the plugin
   *           initialization from succeeding.
   * @throws InitializationException
   *           If a problem occurs while initializing the plugins that
   *           is not related to the server configuration.
   */
  public void initializeUserPlugins(Set<PluginType> pluginTypes)
         throws ConfigException, InitializationException
  {
    //Initialize the user plugins.
    for (String pluginName : pluginRootConfig.listPlugins())
    {
      PluginCfg pluginConfiguration = pluginRootConfig.getPlugin(pluginName);
      pluginConfiguration.addChangeListener(this);

      if (! pluginConfiguration.isEnabled())
      {
        continue;
      }

      // Create a set of plugin types for the plugin.
      HashSet<PluginType> initTypes = new HashSet<>();
      for (PluginCfgDefn.PluginType pluginType : pluginConfiguration.getPluginType())
      {
        PluginType t = getPluginType(pluginType);
        if (pluginTypes == null || pluginTypes.contains(t))
        {
          initTypes.add(t);
        }
      }

      if (initTypes.isEmpty())
      {
        continue;
      }

      try
      {
        DirectoryServerPlugin<? extends PluginCfg> plugin =
             loadPlugin(pluginConfiguration.getJavaClass(), initTypes,
                        pluginConfiguration, true);
        registerPlugin(plugin, pluginConfiguration.dn(), initTypes);
      }
      catch (InitializationException ie)
      {
        logger.error(ie.getMessageObject());
        continue;
      }
    }
  }



  /**
   * Loads the specified class, instantiates it as a plugin, and optionally
   * initializes that plugin.
   *
   * @param  className      The fully-qualified name of the plugin class to
   *                        load, instantiate, and initialize.
   * @param  pluginTypes    The set of plugin types for the plugins to
   *                        initialize, or {@code null} to initialize all types
   *                        of plugins defined in the server configuration.  In
   *                        general, this should only be non-null for cases in
   *                        which the server is running in a special mode that
   *                        only uses a minimal set of plugins (e.g., LDIF
   *                        import or export).
   * @param  configuration  The configuration to use to initialize the plugin.
   *                        It must not be {@code null}.
   * @param  initialize     Indicates whether the plugin instance should be
   *                        initialized.
   *
   * @return  The possibly initialized plugin.
   *
   * @throws  InitializationException  If a problem occurred while attempting to
   *                                   initialize the plugin.
   */
  private <T extends PluginCfg> DirectoryServerPlugin<T>
               loadPlugin(String className, Set<PluginType> pluginTypes,
                          T configuration, boolean initialize)
          throws InitializationException
  {
    try
    {
      PluginCfgDefn definition =
           PluginCfgDefn.getInstance();
      ClassPropertyDefinition propertyDefinition =
           definition.getJavaClassPropertyDefinition();
      Class<? extends DirectoryServerPlugin> pluginClass =
           propertyDefinition.loadClass(className, DirectoryServerPlugin.class);
      DirectoryServerPlugin<T> plugin = pluginClass.newInstance();

      if (initialize)
      {
        plugin.initializeInternal(configuration.dn(), pluginTypes,
            configuration.isInvokeForInternalOperations());
        plugin.initializePlugin(pluginTypes, configuration);
      }
      else
      {
        List<LocalizableMessage> unacceptableReasons = new ArrayList<>();
        if (!plugin.isConfigurationAcceptable(configuration, unacceptableReasons))
        {
          String buffer = Utils.joinAsString(".  ", unacceptableReasons);
          throw new InitializationException(
              ERR_CONFIG_PLUGIN_CONFIG_NOT_ACCEPTABLE.get(configuration.dn(), buffer));
        }
      }

      return plugin;
    }
    catch (Exception e)
    {
      LocalizableMessage message = ERR_CONFIG_PLUGIN_CANNOT_INITIALIZE.
          get(className, configuration.dn(), stackTraceToSingleLineString(e));
      throw new InitializationException(message, e);
    }
  }



  /**
   * Gets the OpenDS plugin type object that corresponds to the configuration
   * counterpart.
   *
   * @param  configPluginType  The configuration plugin type for which to
   *                           retrieve the OpenDS plugin type.
   */
  private PluginType getPluginType(PluginCfgDefn.PluginType
                                        configPluginType)
  {
    switch (configPluginType)
    {
      case STARTUP:                return PluginType.STARTUP;
      case SHUTDOWN:               return PluginType.SHUTDOWN;
      case POSTCONNECT:            return PluginType.POST_CONNECT;
      case POSTDISCONNECT:         return PluginType.POST_DISCONNECT;
      case LDIFIMPORT:             return PluginType.LDIF_IMPORT;
      case LDIFIMPORTEND:          return PluginType.LDIF_IMPORT_END;
      case LDIFIMPORTBEGIN:        return PluginType.LDIF_IMPORT_BEGIN;
      case LDIFEXPORT:             return PluginType.LDIF_EXPORT;
      case PREPARSEABANDON:        return PluginType.PRE_PARSE_ABANDON;
      case PREPARSEADD:            return PluginType.PRE_PARSE_ADD;
      case PREPARSEBIND:           return PluginType.PRE_PARSE_BIND;
      case PREPARSECOMPARE:        return PluginType.PRE_PARSE_COMPARE;
      case PREPARSEDELETE:         return PluginType.PRE_PARSE_DELETE;
      case PREPARSEEXTENDED:       return PluginType.PRE_PARSE_EXTENDED;
      case PREPARSEMODIFY:         return PluginType.PRE_PARSE_MODIFY;
      case PREPARSEMODIFYDN:       return PluginType.PRE_PARSE_MODIFY_DN;
      case PREPARSESEARCH:         return PluginType.PRE_PARSE_SEARCH;
      case PREPARSEUNBIND:         return PluginType.PRE_PARSE_UNBIND;
      case PREOPERATIONADD:        return PluginType.PRE_OPERATION_ADD;
      case PREOPERATIONBIND:       return PluginType.PRE_OPERATION_BIND;
      case PREOPERATIONCOMPARE:    return PluginType.PRE_OPERATION_COMPARE;
      case PREOPERATIONDELETE:     return PluginType.PRE_OPERATION_DELETE;
      case PREOPERATIONEXTENDED:   return PluginType.PRE_OPERATION_EXTENDED;
      case PREOPERATIONMODIFY:     return PluginType.PRE_OPERATION_MODIFY;
      case PREOPERATIONMODIFYDN:   return PluginType.PRE_OPERATION_MODIFY_DN;
      case PREOPERATIONSEARCH:     return PluginType.PRE_OPERATION_SEARCH;
      case POSTOPERATIONABANDON:   return PluginType.POST_OPERATION_ABANDON;
      case POSTOPERATIONADD:       return PluginType.POST_OPERATION_ADD;
      case POSTOPERATIONBIND:      return PluginType.POST_OPERATION_BIND;
      case POSTOPERATIONCOMPARE:   return PluginType.POST_OPERATION_COMPARE;
      case POSTOPERATIONDELETE:    return PluginType.POST_OPERATION_DELETE;
      case POSTOPERATIONEXTENDED:  return PluginType.POST_OPERATION_EXTENDED;
      case POSTOPERATIONMODIFY:    return PluginType.POST_OPERATION_MODIFY;
      case POSTOPERATIONMODIFYDN:  return PluginType.POST_OPERATION_MODIFY_DN;
      case POSTOPERATIONSEARCH:    return PluginType.POST_OPERATION_SEARCH;
      case POSTOPERATIONUNBIND:    return PluginType.POST_OPERATION_UNBIND;
      case POSTRESPONSEADD:        return PluginType.POST_RESPONSE_ADD;
      case POSTRESPONSEBIND:       return PluginType.POST_RESPONSE_BIND;
      case POSTRESPONSECOMPARE:    return PluginType.POST_RESPONSE_COMPARE;
      case POSTRESPONSEDELETE:     return PluginType.POST_RESPONSE_DELETE;
      case POSTRESPONSEEXTENDED:   return PluginType.POST_RESPONSE_EXTENDED;
      case POSTRESPONSEMODIFY:     return PluginType.POST_RESPONSE_MODIFY;
      case POSTRESPONSEMODIFYDN:   return PluginType.POST_RESPONSE_MODIFY_DN;
      case POSTRESPONSESEARCH:     return PluginType.POST_RESPONSE_SEARCH;
      case SEARCHRESULTENTRY:      return PluginType.SEARCH_RESULT_ENTRY;
      case SEARCHRESULTREFERENCE:  return PluginType.SEARCH_RESULT_REFERENCE;
      case SUBORDINATEMODIFYDN:    return PluginType.SUBORDINATE_MODIFY_DN;
      case SUBORDINATEDELETE:      return PluginType.SUBORDINATE_DELETE;
      case INTERMEDIATERESPONSE:   return PluginType.INTERMEDIATE_RESPONSE;
      case POSTSYNCHRONIZATIONADD:
                return PluginType.POST_SYNCHRONIZATION_ADD;
      case POSTSYNCHRONIZATIONDELETE:
                return PluginType.POST_SYNCHRONIZATION_DELETE;
      case POSTSYNCHRONIZATIONMODIFY:
                return PluginType.POST_SYNCHRONIZATION_MODIFY;
      case POSTSYNCHRONIZATIONMODIFYDN:
                return PluginType.POST_SYNCHRONIZATION_MODIFY_DN;
      default:                     return null;
    }
  }



  /**
   * Finalizes all plugins that are registered with the Directory Server.
   */
  public void finalizePlugins()
  {
    pluginLock.lock();

    try
    {
      for (DirectoryServerPlugin<? extends PluginCfg> plugin : registeredPlugins.values())
      {
        try
        {
          plugin.finalizePlugin();
        }
        catch (Exception e)
        {
          logger.traceException(e);
        }
      }

      registeredPlugins.clear();
    }
    finally
    {
      pluginLock.unlock();
    }
  }



  /**
   * Retrieves the set of plugins that have been registered with the Directory
   * Server.
   *
   * @return  The set of plugins that have been registered with the Directory
   *          Server.
   */
  public ConcurrentHashMap<DN,
              DirectoryServerPlugin<? extends PluginCfg>>
                   getRegisteredPlugins()
  {
    return registeredPlugins;
  }



  /**
   * Retrieves the plugin with the specified configuration entry DN.
   *
   * @param  pluginDN  The DN of the configuration entry for the plugin to
   *                   retrieve.
   *
   * @return  The requested plugin, or <CODE>null</CODE> if there is no such
   *          plugin.
   */
  public DirectoryServerPlugin getRegisteredPlugin(DN pluginDN)
  {
    return registeredPlugins.get(pluginDN);
  }



  /**
   * Registers the provided internal plugin with this plugin config
   * manager and ensures that it will be invoked in the specified ways.
   *
   * @param plugin
   *          The internal plugin to register with the server. The
   *          plugin must specify a configuration entry which is
   *          guaranteed to be unique.
   */
  void registerInternalPlugin(InternalDirectoryServerPlugin plugin)
  {
    pluginLock.lock();
    try
    {
      registerPlugin0(plugin, plugin.getPluginTypes());
    }
    finally
    {
      pluginLock.unlock();
    }
  }



  /**
   * Register a plugin in the appropriate tables.
   *
   * @param plugin
   *          The plugin to register with the server.
   * @param pluginTypes
   *          The plugin types that will be used to control the points
   *          at which the provided plugin is invoked.
   */
  private void registerPlugin0(
      DirectoryServerPlugin<? extends PluginCfg> plugin,
      Set<PluginType> pluginTypes)
  {
    for (PluginType t : pluginTypes)
    {
      switch (t)
      {
      case STARTUP:
        startupPlugins =
            addPlugin(startupPlugins, plugin, t, pluginRootConfig
                .getPluginOrderStartup());
        break;
      case SHUTDOWN:
        shutdownPlugins =
            addPlugin(shutdownPlugins, plugin, t, pluginRootConfig
                .getPluginOrderShutdown());
        break;
      case POST_CONNECT:
        postConnectPlugins =
            addPlugin(postConnectPlugins, plugin, t, pluginRootConfig
                .getPluginOrderPostConnect());
        break;
      case POST_DISCONNECT:
        postDisconnectPlugins =
            addPlugin(postDisconnectPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPostDisconnect());
        break;
      case LDIF_IMPORT:
        ldifImportPlugins =
            addPlugin(ldifImportPlugins, plugin, t, pluginRootConfig
                .getPluginOrderLDIFImport());
        break;
      case LDIF_IMPORT_END:
        ldifImportEndPlugins =
            addPlugin(ldifImportEndPlugins, plugin, t, pluginRootConfig
                .getPluginOrderLDIFImportEnd());
        break;
      case LDIF_IMPORT_BEGIN:
        ldifImportBeginPlugins =
            addPlugin(ldifImportBeginPlugins, plugin, t,
                pluginRootConfig.getPluginOrderLDIFImportBegin());
        break;
      case LDIF_EXPORT:
        ldifExportPlugins =
            addPlugin(ldifExportPlugins, plugin, t, pluginRootConfig
                .getPluginOrderLDIFExport());
        break;
      case PRE_PARSE_ABANDON:
        preParseAbandonPlugins =
            addPlugin(preParseAbandonPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPreParseAbandon());
        break;
      case PRE_PARSE_ADD:
        preParseAddPlugins =
            addPlugin(preParseAddPlugins, plugin, t, pluginRootConfig
                .getPluginOrderPreParseAdd());
        break;
      case PRE_PARSE_BIND:
        preParseBindPlugins =
            addPlugin(preParseBindPlugins, plugin, t, pluginRootConfig
                .getPluginOrderPreParseBind());
        break;
      case PRE_PARSE_COMPARE:
        preParseComparePlugins =
            addPlugin(preParseComparePlugins, plugin, t,
                pluginRootConfig.getPluginOrderPreParseCompare());
        break;
      case PRE_PARSE_DELETE:
        preParseDeletePlugins =
            addPlugin(preParseDeletePlugins, plugin, t,
                pluginRootConfig.getPluginOrderPreParseDelete());
        break;
      case PRE_PARSE_EXTENDED:
        preParseExtendedPlugins =
            addPlugin(preParseExtendedPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPreParseExtended());
        break;
      case PRE_PARSE_MODIFY:
        preParseModifyPlugins =
            addPlugin(preParseModifyPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPreParseModify());
        break;
      case PRE_PARSE_MODIFY_DN:
        preParseModifyDNPlugins =
            addPlugin(preParseModifyDNPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPreParseModifyDN());
        break;
      case PRE_PARSE_SEARCH:
        preParseSearchPlugins =
            addPlugin(preParseSearchPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPreParseSearch());
        break;
      case PRE_PARSE_UNBIND:
        preParseUnbindPlugins =
            addPlugin(preParseUnbindPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPreParseUnbind());
        break;
      case PRE_OPERATION_ADD:
        preOperationAddPlugins =
            addPlugin(preOperationAddPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPreOperationAdd());
        break;
      case PRE_OPERATION_BIND:
        preOperationBindPlugins =
            addPlugin(preOperationBindPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPreOperationBind());
        break;
      case PRE_OPERATION_COMPARE:
        preOperationComparePlugins =
            addPlugin(preOperationComparePlugins, plugin, t,
                pluginRootConfig.getPluginOrderPreOperationCompare());
        break;
      case PRE_OPERATION_DELETE:
        preOperationDeletePlugins =
            addPlugin(preOperationDeletePlugins, plugin, t,
                pluginRootConfig.getPluginOrderPreOperationDelete());
        break;
      case PRE_OPERATION_EXTENDED:
        preOperationExtendedPlugins =
            addPlugin(preOperationExtendedPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPreOperationExtended());
        break;
      case PRE_OPERATION_MODIFY:
        preOperationModifyPlugins =
            addPlugin(preOperationModifyPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPreOperationModify());
        break;
      case PRE_OPERATION_MODIFY_DN:
        preOperationModifyDNPlugins =
            addPlugin(preOperationModifyDNPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPreOperationModifyDN());
        break;
      case PRE_OPERATION_SEARCH:
        preOperationSearchPlugins =
            addPlugin(preOperationSearchPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPreOperationSearch());
        break;
      case POST_OPERATION_ABANDON:
        postOperationAbandonPlugins =
            addPlugin(postOperationAbandonPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPostOperationAbandon());
        break;
      case POST_OPERATION_ADD:
        postOperationAddPlugins =
            addPlugin(postOperationAddPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPostOperationAdd());
        break;
      case POST_OPERATION_BIND:
        postOperationBindPlugins =
            addPlugin(postOperationBindPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPostOperationBind());
        break;
      case POST_OPERATION_COMPARE:
        postOperationComparePlugins =
            addPlugin(postOperationComparePlugins, plugin, t,
                pluginRootConfig.getPluginOrderPostOperationCompare());
        break;
      case POST_OPERATION_DELETE:
        postOperationDeletePlugins =
            addPlugin(postOperationDeletePlugins, plugin, t,
                pluginRootConfig.getPluginOrderPostOperationDelete());
        break;
      case POST_OPERATION_EXTENDED:
        postOperationExtendedPlugins =
            addPlugin(postOperationExtendedPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPostOperationExtended());
        break;
      case POST_OPERATION_MODIFY:
        postOperationModifyPlugins =
            addPlugin(postOperationModifyPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPostOperationModify());
        break;
      case POST_OPERATION_MODIFY_DN:
        postOperationModifyDNPlugins =
            addPlugin(postOperationModifyDNPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPostOperationModifyDN());
        break;
      case POST_OPERATION_SEARCH:
        postOperationSearchPlugins =
            addPlugin(postOperationSearchPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPostOperationSearch());
        break;
      case POST_OPERATION_UNBIND:
        postOperationUnbindPlugins =
            addPlugin(postOperationUnbindPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPostOperationUnbind());
        break;
      case POST_RESPONSE_ADD:
        postResponseAddPlugins =
            addPlugin(postResponseAddPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPostResponseAdd());
        break;
      case POST_RESPONSE_BIND:
        postResponseBindPlugins =
            addPlugin(postResponseBindPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPostResponseBind());
        break;
      case POST_RESPONSE_COMPARE:
        postResponseComparePlugins =
            addPlugin(postResponseComparePlugins, plugin, t,
                pluginRootConfig.getPluginOrderPostResponseCompare());
        break;
      case POST_RESPONSE_DELETE:
        postResponseDeletePlugins =
            addPlugin(postResponseDeletePlugins, plugin, t,
                pluginRootConfig.getPluginOrderPostResponseDelete());
        break;
      case POST_RESPONSE_EXTENDED:
        postResponseExtendedPlugins =
            addPlugin(postResponseExtendedPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPostResponseExtended());
        break;
      case POST_RESPONSE_MODIFY:
        postResponseModifyPlugins =
            addPlugin(postResponseModifyPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPostResponseModify());
        break;
      case POST_RESPONSE_MODIFY_DN:
        postResponseModifyDNPlugins =
            addPlugin(postResponseModifyDNPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPostResponseModifyDN());
        break;
      case POST_RESPONSE_SEARCH:
        postResponseSearchPlugins =
            addPlugin(postResponseSearchPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPostResponseSearch());
        break;
      case POST_SYNCHRONIZATION_ADD:
        postSynchronizationAddPlugins =
            addPlugin(postSynchronizationAddPlugins, plugin, t,
                pluginRootConfig.getPluginOrderPostSynchronizationAdd());
        break;
      case POST_SYNCHRONIZATION_DELETE:
        postSynchronizationDeletePlugins =
            addPlugin(postSynchronizationDeletePlugins, plugin, t,
                pluginRootConfig
                    .getPluginOrderPostSynchronizationDelete());
        break;
      case POST_SYNCHRONIZATION_MODIFY:
        postSynchronizationModifyPlugins =
            addPlugin(postSynchronizationModifyPlugins, plugin, t,
                pluginRootConfig
                    .getPluginOrderPostSynchronizationModify());
        break;
      case POST_SYNCHRONIZATION_MODIFY_DN:
        postSynchronizationModifyDNPlugins =
            addPlugin(postSynchronizationModifyDNPlugins, plugin, t,
                pluginRootConfig
                    .getPluginOrderPostSynchronizationModifyDN());
        break;
      case SEARCH_RESULT_ENTRY:
        searchResultEntryPlugins =
            addPlugin(searchResultEntryPlugins, plugin, t,
                pluginRootConfig.getPluginOrderSearchResultEntry());
        break;
      case SEARCH_RESULT_REFERENCE:
        searchResultReferencePlugins =
            addPlugin(searchResultReferencePlugins, plugin, t,
                pluginRootConfig.getPluginOrderSearchResultReference());
        break;
      case SUBORDINATE_MODIFY_DN:
        subordinateModifyDNPlugins =
            addPlugin(subordinateModifyDNPlugins, plugin, t,
                pluginRootConfig.getPluginOrderSubordinateModifyDN());
        break;
      case SUBORDINATE_DELETE:
        subordinateDeletePlugins =
            addPlugin(subordinateDeletePlugins, plugin, t,
                pluginRootConfig.getPluginOrderSubordinateDelete());
        break;
      case INTERMEDIATE_RESPONSE:
        intermediateResponsePlugins =
            addPlugin(intermediateResponsePlugins, plugin, t,
                pluginRootConfig.getPluginOrderIntermediateResponse());
        break;
      default:
      }
    }
  }



  /**
   * Registers the provided plugin with this plugin config manager and
   * ensures that it will be invoked in the specified ways.
   *
   * @param plugin
   *          The plugin to register with the server.
   * @param pluginEntryDN
   *          The DN of the configuration entry for the provided plugin.
   * @param pluginTypes
   *          The plugin types that will be used to control the points
   *          at which the provided plugin is invoked.
   */
  private void registerPlugin(
      DirectoryServerPlugin<? extends PluginCfg> plugin,
      DN pluginEntryDN, Set<PluginType> pluginTypes)
  {
    pluginLock.lock();
    try
    {
      registeredPlugins.put(pluginEntryDN, plugin);
      registerPlugin0(plugin, pluginTypes);
    }
    finally
    {
      pluginLock.unlock();
    }
  }



  /**
   * Adds the provided plugin to the given array.  The provided array will not
   * itself be modified, but rather a new array will be created with one
   * additional element.  The provided plugin will be the last element in the
   * new array.
   * <BR><BR>
   * Note that the only use of this method outside of this class should be for
   * testing purposes.
   *
   * @param  pluginArray  The array containing the existing set of plugins.
   * @param  plugin       The plugin to be added to the array.
   * @param  pluginType   The plugin type for the plugin being registered.
   * @param  pluginOrder  A string that represents the order in which plugins of
   *                      this type should be invoked, or {@code null} if the
   *                      order is not considered important.
   *
   * @return  The new array containing the new set of plugins.
   */
  static DirectoryServerPlugin[] addPlugin(DirectoryServerPlugin[] pluginArray,
                                           DirectoryServerPlugin plugin,
                                           PluginType pluginType,
                                           String pluginOrder)
  {
    // If the provided plugin order string is null, empty, or contains only a
    // wildcard, then simply add the new plugin to the end of the list.
    // Otherwise, parse the order string and figure out where to put the
    // provided plugin.
    if (pluginOrder == null
        || (pluginOrder = pluginOrder.trim()).length() == 0
        || pluginOrder.equals("*"))
    {
      DirectoryServerPlugin[] newPlugins =
           new DirectoryServerPlugin[pluginArray.length+1];
      System.arraycopy(pluginArray, 0, newPlugins, 0, pluginArray.length);
      newPlugins[pluginArray.length] = plugin;

      return newPlugins;
    }
    else
    {
      // Parse the plugin order into initial and final plugin names.
      boolean starFound = false;
      LinkedHashSet<String> initialPluginNames = new LinkedHashSet<>();
      LinkedHashSet<String> finalPluginNames   = new LinkedHashSet<>();

      StringTokenizer tokenizer = new StringTokenizer(pluginOrder, ",");
      while (tokenizer.hasMoreTokens())
      {
        String token = tokenizer.nextToken().trim();
        if (token.length() == 0)
        {
          // Only log the warning once per plugin type.  The plugin array will
          // be empty the first time through, so we can use that to make the
          // determination.
          if (pluginArray.length == 0)
          {
            logger.warn(WARN_CONFIG_PLUGIN_EMPTY_ELEMENT_IN_ORDER, pluginType.getName());
          }
        }
        else if (token.equals("*"))
        {
          if (starFound)
          {
            // Only log the warning once per plugin type.  The plugin array will
            // be empty the first time through, so we can use that to make the
            // determination.
            if (pluginArray.length == 0)
            {
              logger.warn(WARN_CONFIG_PLUGIN_MULTIPLE_WILDCARDS_IN_ORDER, pluginType.getName());
            }
          }
          else
          {
            starFound = true;
          }
        }
        else
        {
          String lowerName = toLowerCase(token);
          if (starFound)
          {
            if (initialPluginNames.contains(lowerName) ||
                finalPluginNames.contains(lowerName))
            {
              // Only log the warning once per plugin type.  The plugin array
              // will be empty the first time through, so we can use that to
              // make the determination.
              if (pluginArray.length == 0)
              {
                logger.warn(WARN_CONFIG_PLUGIN_LISTED_MULTIPLE_TIMES,
                    pluginType.getName(), token);
              }
            }

            finalPluginNames.add(lowerName);
          }
          else
          {
            if (initialPluginNames.contains(lowerName))
            {
              // Only log the warning once per plugin type.  The plugin array
              // will be empty the first time through, so we can use that to
              // make the determination.
              if (pluginArray.length == 0)
              {
                logger.warn(WARN_CONFIG_PLUGIN_LISTED_MULTIPLE_TIMES,
                    pluginType.getName(), token);
              }
            }

            initialPluginNames.add(lowerName);
          }
        }
      }

      if (! starFound)
      {
        // Only log the warning once per plugin type.  The plugin array will be
        // empty the first time through, so we can use that to make the
        // determination.
        if (pluginArray.length == 0)
        {
          logger.warn(WARN_CONFIG_PLUGIN_ORDER_NO_WILDCARD, pluginType.getName());
        }
      }


      // Parse the array of already registered plugins to sort them accordingly.
      HashMap<String,DirectoryServerPlugin> initialPlugins = new HashMap<>(initialPluginNames.size());
      HashMap<String,DirectoryServerPlugin> finalPlugins = new HashMap<>(finalPluginNames.size());
      ArrayList<DirectoryServerPlugin> otherPlugins = new ArrayList<>();
      for (DirectoryServerPlugin p : pluginArray)
      {
        DN dn = p.getPluginEntryDN();
        String lowerName = toLowerCase(dn.rdn().getFirstAVA().getAttributeValue().toString());
        if (initialPluginNames.contains(lowerName))
        {
          initialPlugins.put(lowerName, p);
        }
        else if (finalPluginNames.contains(lowerName))
        {
          finalPlugins.put(lowerName, p);
        }
        else
        {
          otherPlugins.add(p);
        }
      }


      // Get the name of the provided plugin from its RDN value and put it in
      // the correct category.
      DN dn = plugin.getPluginEntryDN();
      String lowerName = toLowerCase(dn.rdn().getFirstAVA().getAttributeValue().toString());
      if (initialPluginNames.contains(lowerName))
      {
        initialPlugins.put(lowerName, plugin);
      }
      else if (finalPluginNames.contains(lowerName))
      {
        finalPlugins.put(lowerName, plugin);
      }
      else
      {
        otherPlugins.add(plugin);
      }


      // Compile a list of all the plugins in the correct order, convert it to
      // an array, and return it.
      ArrayList<DirectoryServerPlugin> newList = new ArrayList<>(pluginArray.length + 1);
      for (String name : initialPluginNames)
      {
        DirectoryServerPlugin p = initialPlugins.get(name);
        if (p != null)
        {
          newList.add(p);
        }
      }

      newList.addAll(otherPlugins);

      for (String name : finalPluginNames)
      {
        DirectoryServerPlugin p = finalPlugins.get(name);
        if (p != null)
        {
          newList.add(p);
        }
      }

      DirectoryServerPlugin[] newPlugins =
           new DirectoryServerPlugin[newList.size()];
      newList.toArray(newPlugins);
      return newPlugins;
    }
  }



  /**
   * Deregisters the provided internal plugin.
   *
   * @param plugin
   *          The internal plugin to deregister from the server.
   */
  void deregisterInternalPlugin(InternalDirectoryServerPlugin plugin)
  {
    pluginLock.lock();
    try
    {
      deregisterPlugin0(plugin);
      plugin.finalizePlugin();
    }
    finally
    {
      pluginLock.unlock();
    }
  }



  /**
   * Deregisters the plugin with the provided configuration entry DN.
   *
   * @param configEntryDN
   *          The DN of the configuration entry for the plugin to
   *          deregister.
   */
  private void deregisterPlugin(DN configEntryDN)
  {
    pluginLock.lock();
    DirectoryServerPlugin<? extends PluginCfg> plugin;
    try
    {
      plugin = registeredPlugins.remove(configEntryDN);
      if (plugin != null)
      {
        deregisterPlugin0(plugin);
        plugin.finalizePlugin();
      }
    }
    finally
    {
      pluginLock.unlock();
    }
  }



  /**
   * Deregisters the provided plugin.
   *
   * @param plugin
   *          The plugin to deregister from the server.
   */
  private void deregisterPlugin0(
      DirectoryServerPlugin<? extends PluginCfg> plugin)
  {
    for (PluginType t : plugin.getPluginTypes())
    {
      switch (t)
      {
        case STARTUP:
          startupPlugins = removePlugin(startupPlugins, plugin);
          break;
        case SHUTDOWN:
          shutdownPlugins = removePlugin(shutdownPlugins, plugin);
          break;
        case POST_CONNECT:
          postConnectPlugins = removePlugin(postConnectPlugins, plugin);
          break;
        case POST_DISCONNECT:
          postDisconnectPlugins = removePlugin(postDisconnectPlugins, plugin);
          break;
        case LDIF_IMPORT:
          ldifImportPlugins = removePlugin(ldifImportPlugins, plugin);
          break;
        case LDIF_IMPORT_END:
          ldifImportEndPlugins = removePlugin(ldifImportEndPlugins, plugin);
          break;
        case LDIF_IMPORT_BEGIN:
          ldifImportBeginPlugins =
            removePlugin(ldifImportBeginPlugins, plugin);
          break;
        case LDIF_EXPORT:
          ldifExportPlugins = removePlugin(ldifExportPlugins, plugin);
          break;
        case PRE_PARSE_ABANDON:
          preParseAbandonPlugins = removePlugin(preParseAbandonPlugins,
                                                plugin);
          break;
        case PRE_PARSE_ADD:
          preParseAddPlugins = removePlugin(preParseAddPlugins, plugin);
          break;
        case PRE_PARSE_BIND:
          preParseBindPlugins = removePlugin(preParseBindPlugins, plugin);
          break;
        case PRE_PARSE_COMPARE:
          preParseComparePlugins = removePlugin(preParseComparePlugins,
                                                plugin);
          break;
        case PRE_PARSE_DELETE:
          preParseDeletePlugins = removePlugin(preParseDeletePlugins, plugin);
          break;
        case PRE_PARSE_EXTENDED:
          preParseExtendedPlugins = removePlugin(preParseExtendedPlugins,
                                                 plugin);
          break;
        case PRE_PARSE_MODIFY:
          preParseModifyPlugins = removePlugin(preParseModifyPlugins, plugin);
          break;
        case PRE_PARSE_MODIFY_DN:
          preParseModifyDNPlugins = removePlugin(preParseModifyDNPlugins,
                                                 plugin);
          break;
        case PRE_PARSE_SEARCH:
          preParseSearchPlugins = removePlugin(preParseSearchPlugins, plugin);
          break;
        case PRE_PARSE_UNBIND:
          preParseUnbindPlugins = removePlugin(preParseUnbindPlugins, plugin);
          break;
        case PRE_OPERATION_ADD:
          preOperationAddPlugins = removePlugin(preOperationAddPlugins,
                                                plugin);
          break;
        case PRE_OPERATION_BIND:
          preOperationBindPlugins = removePlugin(preOperationBindPlugins,
                                                 plugin);
          break;
        case PRE_OPERATION_COMPARE:
          preOperationComparePlugins =
               removePlugin(preOperationComparePlugins, plugin);
          break;
        case PRE_OPERATION_DELETE:
          preOperationDeletePlugins = removePlugin(preOperationDeletePlugins,
                                                   plugin);
          break;
        case PRE_OPERATION_EXTENDED:
          preOperationExtendedPlugins =
               removePlugin(preOperationExtendedPlugins, plugin);
          break;
        case PRE_OPERATION_MODIFY:
          preOperationModifyPlugins = removePlugin(preOperationModifyPlugins,
                                                   plugin);
          break;
        case PRE_OPERATION_MODIFY_DN:
          preOperationModifyDNPlugins =
               removePlugin(preOperationModifyDNPlugins, plugin);
          break;
        case PRE_OPERATION_SEARCH:
          preOperationSearchPlugins = removePlugin(preOperationSearchPlugins,
                                                   plugin);
          break;
        case POST_OPERATION_ABANDON:
          postOperationAbandonPlugins =
               removePlugin(postOperationAbandonPlugins, plugin);
          break;
        case POST_OPERATION_ADD:
          postOperationAddPlugins = removePlugin(postOperationAddPlugins,
                                                 plugin);
          break;
        case POST_OPERATION_BIND:
          postOperationBindPlugins = removePlugin(postOperationBindPlugins,
                                                  plugin);
          break;
        case POST_OPERATION_COMPARE:
          postOperationComparePlugins =
               removePlugin(postOperationComparePlugins, plugin);
          break;
        case POST_OPERATION_DELETE:
          postOperationDeletePlugins =
               removePlugin(postOperationDeletePlugins, plugin);
          break;
        case POST_OPERATION_EXTENDED:
          postOperationExtendedPlugins =
               removePlugin(postOperationExtendedPlugins, plugin);
          break;
        case POST_OPERATION_MODIFY:
          postOperationModifyPlugins =
               removePlugin(postOperationModifyPlugins, plugin);
          break;
        case POST_OPERATION_MODIFY_DN:
          postOperationModifyDNPlugins =
               removePlugin(postOperationModifyDNPlugins, plugin);
          break;
        case POST_OPERATION_SEARCH:
          postOperationSearchPlugins =
               removePlugin(postOperationSearchPlugins, plugin);
          break;
        case POST_OPERATION_UNBIND:
          postOperationUnbindPlugins =
               removePlugin(postOperationUnbindPlugins, plugin);
          break;
        case POST_RESPONSE_ADD:
          postResponseAddPlugins = removePlugin(postResponseAddPlugins,
                                                plugin);
          break;
        case POST_RESPONSE_BIND:
          postResponseBindPlugins = removePlugin(postResponseBindPlugins,
                                                 plugin);
          break;
        case POST_RESPONSE_COMPARE:
          postResponseComparePlugins =
               removePlugin(postResponseComparePlugins, plugin);
          break;
        case POST_RESPONSE_DELETE:
          postResponseDeletePlugins = removePlugin(postResponseDeletePlugins,
                                                   plugin);
          break;
        case POST_RESPONSE_EXTENDED:
          postResponseExtendedPlugins =
               removePlugin(postResponseExtendedPlugins, plugin);
          break;
        case POST_RESPONSE_MODIFY:
          postResponseModifyPlugins = removePlugin(postResponseModifyPlugins,
                                                   plugin);
          break;
        case POST_RESPONSE_MODIFY_DN:
          postResponseModifyDNPlugins =
               removePlugin(postResponseModifyDNPlugins, plugin);
          break;
        case POST_RESPONSE_SEARCH:
          postResponseSearchPlugins = removePlugin(postResponseSearchPlugins,
                                                   plugin);
          break;
        case POST_SYNCHRONIZATION_ADD:
          postSynchronizationAddPlugins =
               removePlugin(postSynchronizationAddPlugins, plugin);
          break;
        case POST_SYNCHRONIZATION_DELETE:
          postSynchronizationDeletePlugins =
               removePlugin(postSynchronizationDeletePlugins, plugin);
          break;
        case POST_SYNCHRONIZATION_MODIFY:
          postSynchronizationModifyPlugins =
               removePlugin(postSynchronizationModifyPlugins, plugin);
          break;
        case POST_SYNCHRONIZATION_MODIFY_DN:
          postSynchronizationModifyDNPlugins =
               removePlugin(postSynchronizationModifyDNPlugins, plugin);
          break;
        case SEARCH_RESULT_ENTRY:
          searchResultEntryPlugins = removePlugin(searchResultEntryPlugins,
                                                  plugin);
          break;
        case SEARCH_RESULT_REFERENCE:
          searchResultReferencePlugins =
               removePlugin(searchResultReferencePlugins, plugin);
          break;
        case SUBORDINATE_MODIFY_DN:
          subordinateModifyDNPlugins =
               removePlugin(subordinateModifyDNPlugins, plugin);
          break;
        case SUBORDINATE_DELETE:
          subordinateDeletePlugins =
               removePlugin(subordinateDeletePlugins, plugin);
          break;
        case INTERMEDIATE_RESPONSE:
          intermediateResponsePlugins =
               removePlugin(intermediateResponsePlugins, plugin);
          break;
        default:
      }
    }
  }



  /**
   * Removes the provided plugin from the given array.  The provided array will
   * not itself be modified, but rather a new array will be created with one
   * fewer element (assuming that the specified plugin was found).
   *
   * @param  pluginArray  The array containing the existing set of plugins.
   * @param  plugin       The plugin to be removed from the array.
   *
   * @return  The new array containing the new set of plugins.
   */
  private DirectoryServerPlugin[]
               removePlugin(DirectoryServerPlugin[] pluginArray,
                            DirectoryServerPlugin plugin)
  {
    int slot   = -1;
    int length = pluginArray.length;
    for (int i=0; i < length; i++)
    {
      if (pluginArray[i].getPluginEntryDN().equals(plugin.getPluginEntryDN()))
      {
        slot = i;
        break;
      }
    }

    if (slot < 0)
    {
      // The plugin wasn't found in the list, so return the same list.
      return pluginArray;
    }


    // If it was the only element in the array, then return an empty array.
    if (length == 0)
    {
      return new DirectoryServerPlugin[0];
    }


    // Create an array that's one element smaller and copy the remaining "good"
    // elements into it.
    DirectoryServerPlugin[] newPlugins = new DirectoryServerPlugin[length-1];
    if (slot > 0)
    {
      System.arraycopy(pluginArray, 0, newPlugins, 0, slot);
    }

    if (slot < length-1)
    {
      System.arraycopy(pluginArray, slot+1, newPlugins, slot, length-slot-1);
    }

    return newPlugins;
  }



  /**
   * Invokes the set of startup plugins that have been registered with the
   * Directory Server.
   *
   * @return  The result of processing the startup plugins.
   */
  public PluginResult.Startup invokeStartupPlugins()
  {
    PluginResult.Startup result = null;

    for (DirectoryServerPlugin p : startupPlugins)
    {
      try
      {
        result = p.doStartup();
      }
      catch (Exception e)
      {
        logger.traceException(e);

        LocalizableMessage message = ERR_PLUGIN_STARTUP_PLUGIN_EXCEPTION.get(
                p.getPluginEntryDN(), stackTraceToSingleLineString(e));
        return PluginResult.Startup.stopStartup(message);
      }

      if (result == null)
      {
        LocalizableMessage message = ERR_PLUGIN_STARTUP_PLUGIN_RETURNED_NULL.get(p.getPluginEntryDN());
        logger.error(message);
        return PluginResult.Startup.stopStartup(message);
      }
      else if (! result.continueProcessing())
      {
        logger.error(ERR_PLUGIN_STARTUP_PLUGIN_FAIL_ABORT,
                p.getPluginEntryDN(),
                result.getErrorMessage(),
                result.getErrorMessage().ordinal());
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no startup plugins registered,
      // which is fine.
      result = PluginResult.Startup.continueStartup();
    }

    return result;
  }



  /**
   * Invokes the set of shutdown plugins that have been configured in the
   * Directory Server.
   *
   * @param  reason  The human-readable reason for the shutdown.
   */
  public void invokeShutdownPlugins(LocalizableMessage reason)
  {
    for (DirectoryServerPlugin p : shutdownPlugins)
    {
      try
      {
        p.doShutdown(reason);
      }
      catch (Exception e)
      {
        logger.traceException(e);
        logger.error(ERR_PLUGIN_SHUTDOWN_PLUGIN_EXCEPTION, p.getPluginEntryDN(), stackTraceToSingleLineString(e));
      }
    }
  }



  /**
   * Invokes the set of post-connect plugins that have been configured in the
   * Directory Server.
   *
   * @param  clientConnection  The client connection that has been established.
   *
   * @return  The result of processing the post-connect plugins.
   */
  public PluginResult.PostConnect invokePostConnectPlugins(ClientConnection
                                                           clientConnection)
  {
    PluginResult.PostConnect result = null;

    for (DirectoryServerPlugin p : postConnectPlugins)
    {
      try
      {
        result = p.doPostConnect(clientConnection);
      }
      catch (Exception e)
      {
        logger.traceException(e);

        LocalizableMessage message = ERR_PLUGIN_POST_CONNECT_PLUGIN_EXCEPTION.
            get(p.getPluginEntryDN(),
                clientConnection.getConnectionID(),
                clientConnection.getClientAddress(),
                stackTraceToSingleLineString(e));
        logger.error(message);

        return PluginResult.PostConnect.disconnectClient(
            DisconnectReason.SERVER_ERROR, true, message);
      }


      if (result == null)
      {
        LocalizableMessage message = ERR_PLUGIN_POST_CONNECT_PLUGIN_RETURNED_NULL.
            get(p.getPluginEntryDN(), clientConnection.getConnectionID(), clientConnection.getClientAddress());
        logger.error(message);

        return PluginResult.PostConnect.disconnectClient(
            DisconnectReason.SERVER_ERROR, true, message);
      }
      else if (!result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no post-connect plugins
      // registered, which is fine.
      result = PluginResult.PostConnect.continueConnectProcessing();
    }

    return result;
  }



  /**
   * Invokes the set of post-disconnect plugins that have been configured in the
   * Directory Server.
   *
   * @param  clientConnection  The client connection that has been closed.
   * @param  disconnectReason  The general reason that the connection was
   *                           closed.
   * @param  message           A human-readable message that may provide
   *                           additional information about the closure.
   *
   * @return  The result of processing the post-connect plugins.
   */
  public PluginResult.PostDisconnect invokePostDisconnectPlugins(
                                        ClientConnection clientConnection,
                                        DisconnectReason disconnectReason,
                                        LocalizableMessage message)
  {
    PluginResult.PostDisconnect result = null;

    for (DirectoryServerPlugin p : postDisconnectPlugins)
    {
      try
      {
        result = p.doPostDisconnect(clientConnection, disconnectReason,
                message);
      }
      catch (Exception e)
      {
        logger.traceException(e);
        logger.error(ERR_PLUGIN_POST_DISCONNECT_PLUGIN_EXCEPTION,
                p.getPluginEntryDN(),
                clientConnection.getConnectionID(),
                clientConnection.getClientAddress(),
                stackTraceToSingleLineString(e));
      }


      if (result == null)
      {
        logger.error(ERR_PLUGIN_POST_DISCONNECT_PLUGIN_RETURNED_NULL,
                p.getPluginEntryDN(),
                clientConnection.getConnectionID(),
                clientConnection.getClientAddress());
      }
      else if (! result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no post-disconnect plugins
      // registered, which is fine.
      result = PluginResult.PostDisconnect.continueDisconnectProcessing();
    }

    return result;
  }



  /**
   * Invokes the set of LDIF import plugins that have been configured in the
   * Directory Server.
   *
   * @param  importConfig  The LDIF import configuration used to read the
   *                       associated entry.
   * @param  entry         The entry that has been read from LDIF.
   *
   * @return  The result of processing the LDIF import plugins.
   */
  public PluginResult.ImportLDIF invokeLDIFImportPlugins(
      LDIFImportConfig importConfig, Entry entry)
  {
    PluginResult.ImportLDIF result = null;

    for (DirectoryServerPlugin p : ldifImportPlugins)
    {
      try
      {
        result = p.doLDIFImport(importConfig, entry);
      }
      catch (Exception e)
      {
        logger.traceException(e);

        LocalizableMessage message = ERR_PLUGIN_LDIF_IMPORT_PLUGIN_EXCEPTION.get(
            p.getPluginEntryDN(), entry.getName(), stackTraceToSingleLineString(e));
        logger.error(message);

        return PluginResult.ImportLDIF.stopEntryProcessing(message);
      }

      if (result == null)
      {
        LocalizableMessage message = ERR_PLUGIN_LDIF_IMPORT_PLUGIN_RETURNED_NULL.
            get(p.getPluginEntryDN(), entry.getName());
        logger.error(message);

        return PluginResult.ImportLDIF.stopEntryProcessing(message);
      }
      else if (! result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no LDIF import plugins
      // registered, which is fine.
      result = PluginResult.ImportLDIF.continueEntryProcessing();
    }

    return result;
  }



  /**
   * Invokes the LDIF import session finalization of LDIF import plugins that
   * have been configured in the Directory Server.
   *
   * @param  importConfig  The LDIF import configuration used for the LDIF
   *                       import session.
   */
  public void invokeLDIFImportEndPlugins(
      LDIFImportConfig importConfig)
  {
    for (DirectoryServerPlugin p : ldifImportEndPlugins)
    {
      p.doLDIFImportEnd(importConfig);
    }
  }



  /**
   * Invokes the LDIF import session initialization of LDIF import plugins that
   * have been configured in the Directory Server.
   *
   * @param  importConfig  The LDIF import configuration used for the LDIF
   *                       import session.
   */
  public void invokeLDIFImportBeginPlugins(
      LDIFImportConfig importConfig)
  {
    for (DirectoryServerPlugin p : ldifImportBeginPlugins)
    {
      p.doLDIFImportBegin(importConfig);
    }
  }



  /**
   * Invokes the set of LDIF export plugins that have been configured in the
   * Directory Server.
   *
   * @param  exportConfig  The LDIF export configuration used to read the
   *                       associated entry.
   * @param  entry         The entry that has been read from LDIF.
   *
   * @return  The result of processing the LDIF export plugins.
   */
  public PluginResult.ImportLDIF invokeLDIFExportPlugins(
      LDIFExportConfig exportConfig, Entry entry)
  {
    PluginResult.ImportLDIF result = null;

    for (DirectoryServerPlugin p : ldifExportPlugins)
    {
      try
      {
        result = p.doLDIFExport(exportConfig, entry);
      }
      catch (Exception e)
      {
        logger.traceException(e);

        LocalizableMessage message = ERR_PLUGIN_LDIF_EXPORT_PLUGIN_EXCEPTION.
            get(p.getPluginEntryDN(),
                entry.getName(),
                stackTraceToSingleLineString(e));
        logger.error(message);

        return PluginResult.ImportLDIF.stopEntryProcessing(message);
      }

      if (result == null)
      {
        LocalizableMessage message = ERR_PLUGIN_LDIF_EXPORT_PLUGIN_RETURNED_NULL.
            get(p.getPluginEntryDN(), entry.getName());
        logger.error(message);

        return PluginResult.ImportLDIF.stopEntryProcessing(message);
      }
      else if (! result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no LDIF export plugins
      // registered, which is fine.
      result = PluginResult.ImportLDIF.continueEntryProcessing();
    }

    return result;
  }



  /**
   * Invokes the set of pre-parse abandon plugins that have been configured in
   * the Directory Server.
   *
   * @param  abandonOperation  The abandon operation for which to invoke the
   *                           pre-parse plugins.
   *
   * @return  The result of processing the pre-parse abandon plugins.
   */
  public PluginResult.PreParse invokePreParseAbandonPlugins(
                                   PreParseAbandonOperation abandonOperation)
  {
    PluginResult.PreParse result = null;

    for (DirectoryServerPlugin p : preParseAbandonPlugins)
    {
      if (isInternalOperation(abandonOperation, p))
      {
        continue;
      }

      try
      {
        result = p.doPreParse(abandonOperation);
      }
      catch (Exception e)
      {
        return handlePreParseException(e, abandonOperation, p);
      }

      if (result == null)
      {
        return handlePreParseResult(abandonOperation, p);
      }
      else if (!result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no pre-parse abandon plugins
      // registered, which is fine.
      result = PluginResult.PreParse.continueOperationProcessing();
    }

    return result;
  }


  private PluginResult.PreParse handlePreParseException(
      Exception e, PreParseOperation operation, DirectoryServerPlugin plugin)
  {
    logger.traceException(e);

    LocalizableMessage message =
        ERR_PLUGIN_PRE_PARSE_PLUGIN_EXCEPTION.get(operation.getOperationType()
            .getOperationName(), plugin.getPluginEntryDN(),
            operation.getConnectionID(), operation.getOperationID(),
            stackTraceToSingleLineString(e));
    logger.error(message);

    return PluginResult.PreParse.stopProcessing(DirectoryServer
        .getServerErrorResultCode(), message);
  }

  private PluginResult.PreParse handlePreParseResult(
      PreParseOperation operation, DirectoryServerPlugin plugin)
  {
    LocalizableMessage message =
        ERR_PLUGIN_PRE_PARSE_PLUGIN_RETURNED_NULL.get(operation
            .getOperationType().getOperationName(), plugin
            .getPluginEntryDN(), operation.getConnectionID(), operation.getOperationID());
    logger.error(message);

    return PluginResult.PreParse.stopProcessing(DirectoryServer
        .getServerErrorResultCode(), message);
  }


  /**
   * Invokes the set of pre-parse add plugins that have been configured in the
   * Directory Server.
   *
   * @param  addOperation  The add operation for which to invoke the pre-parse
   *                       plugins.
   *
   * @return  The result of processing the pre-parse add plugins.
   *
   * @throws CanceledOperationException if the operation should be canceled.
   */
  public PluginResult.PreParse invokePreParseAddPlugins(
      PreParseAddOperation addOperation)
      throws CanceledOperationException {
    PluginResult.PreParse result = null;

    for (DirectoryServerPlugin p : preParseAddPlugins)
    {
      if (isInternalOperation(addOperation, p))
      {
        continue;
      }

      try
      {
        result = p.doPreParse(addOperation);
      }
      catch (CanceledOperationException coe)
      {
        throw coe;
      }
      catch (Exception e)
      {
        return handlePreParseException(e, addOperation, p);
      }

      if (result == null)
      {
        return handlePreParseResult(addOperation, p);
      }
      else if (!result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no pre-parse add plugins
      // registered, which is fine.
      result = PluginResult.PreParse.continueOperationProcessing();
    }

    return result;
  }



  /**
   * Invokes the set of pre-parse bind plugins that have been configured in
   * the Directory Server.
   *
   * @param  bindOperation  The bind operation for which to invoke the pre-parse
   *                        plugins.
   *
   * @return  The result of processing the pre-parse bind plugins.
   */
  public PluginResult.PreParse invokePreParseBindPlugins(
                                   PreParseBindOperation bindOperation)
  {
    PluginResult.PreParse result = null;

    for (DirectoryServerPlugin p : preParseBindPlugins)
    {
      if (isInternalOperation(bindOperation, p))
      {
        continue;
      }

      try
      {
        result = p.doPreParse(bindOperation);
      }
      catch (Exception e)
      {
        return handlePreParseException(e, bindOperation, p);
      }

      if (result == null)
      {
        return handlePreParseResult(bindOperation, p);
      }
      else if (!result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no pre-parse bind plugins
      // registered, which is fine.
      result = PluginResult.PreParse.continueOperationProcessing();
    }

    return result;
  }



  /**
   * Invokes the set of pre-parse compare plugins that have been configured in
   * the Directory Server.
   *
   * @param  compareOperation  The compare operation for which to invoke the
   *                           pre-parse plugins.
   *
   * @return  The result of processing the pre-parse compare plugins.
   *
   * @throws CanceledOperationException if the operation should be canceled.
   */
  public PluginResult.PreParse invokePreParseComparePlugins(
      PreParseCompareOperation compareOperation)
      throws CanceledOperationException {
    PluginResult.PreParse result = null;

    for (DirectoryServerPlugin p : preParseComparePlugins)
    {
      if (isInternalOperation(compareOperation, p))
      {
        continue;
      }

      try
      {
        result = p.doPreParse(compareOperation);
      }
      catch (CanceledOperationException coe)
      {
        throw coe;
      }
      catch (Exception e)
      {
        return handlePreParseException(e, compareOperation, p);
      }

      if (result == null)
      {
        return handlePreParseResult(compareOperation, p);
      }
      else if (!result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no pre-parse compare plugins
      // registered, which is fine.
      result = PluginResult.PreParse.continueOperationProcessing();
    }

    return result;
  }



  /**
   * Invokes the set of pre-parse delete plugins that have been configured in
   * the Directory Server.
   *
   * @param  deleteOperation  The delete operation for which to invoke the
   *                          pre-parse plugins.
   *
   * @return  The result of processing the pre-parse delete plugins.
   *
   * @throws CanceledOperationException if the operation should be canceled.
   */
  public PluginResult.PreParse invokePreParseDeletePlugins(
                              PreParseDeleteOperation deleteOperation)
      throws CanceledOperationException {
    PluginResult.PreParse result = null;

    for (DirectoryServerPlugin p : preParseDeletePlugins)
    {
      if (isInternalOperation(deleteOperation, p))
      {
        continue;
      }

      try
      {
        result = p.doPreParse(deleteOperation);
      }
      catch (CanceledOperationException coe)
      {
        throw coe;
      }
      catch (Exception e)
      {
        return handlePreParseException(e, deleteOperation, p);
      }

      if (result == null)
      {
        return handlePreParseResult(deleteOperation, p);
      }
      else if (!result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no pre-parse delete plugins
      // registered, which is fine.
      result = PluginResult.PreParse.continueOperationProcessing();
    }

    return result;
  }



  /**
   * Invokes the set of pre-parse extended plugins that have been configured in
   * the Directory Server.
   *
   * @param  extendedOperation  The extended operation for which to invoke the
   *                            pre-parse plugins.
   *
   * @return  The result of processing the pre-parse extended plugins.
   *
   * @throws CanceledOperationException if the operation should be canceled.
   */
  public PluginResult.PreParse invokePreParseExtendedPlugins(
                                   PreParseExtendedOperation extendedOperation)
      throws CanceledOperationException {
    PluginResult.PreParse result = null;

    for (DirectoryServerPlugin p : preParseExtendedPlugins)
    {
      if (isInternalOperation(extendedOperation, p))
      {
        continue;
      }

      try
      {
        result = p.doPreParse(extendedOperation);
      }
      catch (CanceledOperationException coe)
      {
        throw coe;
      }
      catch (Exception e)
      {
        return handlePreParseException(e, extendedOperation, p);
      }

      if (result == null)
      {
        return handlePreParseResult(extendedOperation, p);
      }
      else if (!result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no pre-parse extended plugins
      // registered, which is fine.
      result = PluginResult.PreParse.continueOperationProcessing();
    }

    return result;
  }



  /**
   * Invokes the set of pre-parse modify plugins that have been configured in
   * the Directory Server.
   *
   * @param  modifyOperation  The modify operation for which to invoke the
   *                          pre-parse plugins.
   *
   * @return  The result of processing the pre-parse modify plugins.
   *
   * @throws CanceledOperationException if the operation should be canceled.
   */
  public PluginResult.PreParse invokePreParseModifyPlugins(
                                   PreParseModifyOperation modifyOperation)
      throws CanceledOperationException {
    PluginResult.PreParse result = null;

    for (DirectoryServerPlugin p : preParseModifyPlugins)
    {
      if (isInternalOperation(modifyOperation, p))
      {
        continue;
      }

      try
      {
        result = p.doPreParse(modifyOperation);
      }
      catch (CanceledOperationException coe)
      {
        throw coe;
      }
      catch (Exception e)
      {
        return handlePreParseException(e, modifyOperation, p);
      }

      if (result == null)
      {
        return handlePreParseResult(modifyOperation, p);
      }
      else if (!result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no pre-parse modify plugins
      // registered, which is fine.
      result = PluginResult.PreParse.continueOperationProcessing();
    }

    return result;
  }



  /**
   * Invokes the set of pre-parse modify DN plugins that have been configured in
   * the Directory Server.
   *
   * @param  modifyDNOperation  The modify DN operation for which to invoke the
   *                            pre-parse plugins.
   *
   * @return  The result of processing the pre-parse modify DN plugins.
   *
   * @throws CanceledOperationException if the operation should be canceled.
   */
  public PluginResult.PreParse invokePreParseModifyDNPlugins(
                                   PreParseModifyDNOperation modifyDNOperation)
      throws CanceledOperationException {
    PluginResult.PreParse result = null;

    for (DirectoryServerPlugin p : preParseModifyDNPlugins)
    {
      if (isInternalOperation(modifyDNOperation, p))
      {
        continue;
      }

      try
      {
        result = p.doPreParse(modifyDNOperation);
      }
      catch (CanceledOperationException coe)
      {
        throw coe;
      }
      catch (Exception e)
      {
        return handlePreParseException(e, modifyDNOperation, p);
      }

      if (result == null)
      {
        return handlePreParseResult(modifyDNOperation, p);
      }
      else if (!result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no pre-parse modify DN plugins
      // registered, which is fine.
      result = PluginResult.PreParse.continueOperationProcessing();
    }

    return result;
  }



  /**
   * Invokes the set of pre-parse search plugins that have been configured in
   * the Directory Server.
   *
   * @param  searchOperation  The search operation for which to invoke the
   *                          pre-parse plugins.
   *
   * @return  The result of processing the pre-parse search plugins.
   *
   * @throws CanceledOperationException if the operation should be canceled.
   */
  public PluginResult.PreParse invokePreParseSearchPlugins(
                                   PreParseSearchOperation searchOperation)
      throws CanceledOperationException {
    PluginResult.PreParse result = null;

    for (DirectoryServerPlugin p : preParseSearchPlugins)
    {
      if (isInternalOperation(searchOperation, p))
      {
        continue;
      }

      try
      {
        result = p.doPreParse(searchOperation);
      }
      catch (CanceledOperationException coe)
      {
        throw coe;
      }
      catch (Exception e)
      {
        return handlePreParseException(e, searchOperation, p);
      }

      if (result == null)
      {
        return handlePreParseResult(searchOperation, p);
      }
      else if (!result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no pre-parse search plugins
      // registered, which is fine.
      result = PluginResult.PreParse.continueOperationProcessing();
    }

    return result;
  }



  /**
   * Invokes the set of pre-parse unbind plugins that have been configured in
   * the Directory Server.
   *
   * @param  unbindOperation  The unbind operation for which to invoke the
   *                          pre-parse plugins.
   *
   * @return  The result of processing the pre-parse unbind plugins.
   */
  public PluginResult.PreParse invokePreParseUnbindPlugins(
                                   PreParseUnbindOperation unbindOperation)
  {
    PluginResult.PreParse result = null;

    for (DirectoryServerPlugin p : preParseUnbindPlugins)
    {
      if (isInternalOperation(unbindOperation, p))
      {
        continue;
      }

      try
      {
        result = p.doPreParse(unbindOperation);
      }
      catch (Exception e)
      {
        return handlePreParseException(e, unbindOperation, p);
      }

      if (result == null)
      {
        return handlePreParseResult(unbindOperation, p);
      }
      else if (!result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no pre-parse unbind plugins
      // registered, which is fine.
      result = PluginResult.PreParse.continueOperationProcessing();
    }

    return result;
  }



  /**
   * Invokes the set of pre-operation add plugins that have been configured in
   * the Directory Server.
   *
   * @param  addOperation  The add operation for which to invoke the
   *                       pre-operation plugins.
   *
   * @return  The result of processing the pre-operation add plugins.
   *
   * @throws CanceledOperationException if the operation should be canceled.
   */
  public PluginResult.PreOperation invokePreOperationAddPlugins(
                                       PreOperationAddOperation addOperation)
      throws CanceledOperationException {
    PluginResult.PreOperation result = null;

    for (int i = 0; i < preOperationAddPlugins.length; i++)
    {
      DirectoryServerPlugin p = preOperationAddPlugins[i];
      if (isInternalOperation(addOperation, p))
      {
        continue;
      }

      try
      {
        result = p.doPreOperation(addOperation);
      }
      catch (CanceledOperationException coe)
      {
        throw coe;
      }
      catch (Exception e)
      {
        return handlePreOperationException(e, i, preOperationAddPlugins,
            addOperation, p);
      }

      if (result == null)
      {
        return handlePreOperationResult(addOperation, i, preOperationAddPlugins,
            p);
      }
      else if (!result.continuePluginProcessing())
      {
        registerSkippedPreOperationPlugins(i, preOperationAddPlugins,
            addOperation);
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no pre-operation add plugins
      // registered, which is fine.
      result = PluginResult.PreOperation.continueOperationProcessing();
    }

    return result;
  }



  /**
   * Invokes the set of pre-operation bind plugins that have been configured in
   * the Directory Server.
   *
   * @param  bindOperation  The bind operation for which to invoke the
   *                        pre-operation plugins.
   *
   * @return  The result of processing the pre-operation bind plugins.
   */
  public PluginResult.PreOperation invokePreOperationBindPlugins(
                                       PreOperationBindOperation bindOperation)
  {
    PluginResult.PreOperation result = null;

    for (int i = 0; i < preOperationBindPlugins.length; i++)
    {
      DirectoryServerPlugin p = preOperationBindPlugins[i];
      if (isInternalOperation(bindOperation, p))
      {
        continue;
      }

      try
      {
        result = p.doPreOperation(bindOperation);
      }
      catch (Exception e)
      {
        return handlePreOperationException(e, i, preOperationBindPlugins,
            bindOperation, p);
      }

      if (result == null)
      {
        return handlePreOperationResult(bindOperation, i,
            preOperationBindPlugins, p);
      }
      else if (!result.continuePluginProcessing())
      {
        registerSkippedPreOperationPlugins(i, preOperationBindPlugins,
            bindOperation);

        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no pre-operation add plugins
      // registered, which is fine.
      result = PluginResult.PreOperation.continueOperationProcessing();
    }

    return result;
  }



  /**
   * Invokes the set of pre-operation compare plugins that have been configured
   * in the Directory Server.
   *
   * @param  compareOperation  The compare operation for which to invoke the
   *                           pre-operation plugins.
   *
   * @return  The result of processing the pre-operation compare plugins.
   *
   * @throws CanceledOperationException if the operation should be canceled.
   */
  public PluginResult.PreOperation invokePreOperationComparePlugins(
     PreOperationCompareOperation compareOperation)
      throws CanceledOperationException {
    PluginResult.PreOperation result = null;

    for (int i = 0; i < preOperationComparePlugins.length; i++)
    {
      DirectoryServerPlugin p = preOperationComparePlugins[i];
      if (isInternalOperation(compareOperation, p))
      {
        continue;
      }

      try
      {
        result = p.doPreOperation(compareOperation);
      }
      catch (CanceledOperationException coe)
      {
        throw coe;
      }
      catch (Exception e)
      {
        return handlePreOperationException(e, i, preOperationComparePlugins,
            compareOperation, p);
      }

      if (result == null)
      {
        return handlePreOperationResult(compareOperation, i,
            preOperationComparePlugins, p);
      }
      else if (!result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no pre-operation add plugins
      // registered, which is fine.
      result = PluginResult.PreOperation.continueOperationProcessing();
    }

    return result;
  }



  /**
   * Invokes the set of pre-operation delete plugins that have been configured
   * in the Directory Server.
   *
   * @param  deleteOperation  The delete operation for which to invoke the
   *                          pre-operation plugins.
   *
   * @return  The result of processing the pre-operation delete plugins.
   *
   * @throws CanceledOperationException if the operation should be canceled.
   */
  public PluginResult.PreOperation invokePreOperationDeletePlugins(
                                  PreOperationDeleteOperation deleteOperation)
      throws CanceledOperationException {
    PluginResult.PreOperation result = null;

    for (int i = 0; i < preOperationDeletePlugins.length; i++)
    {
      DirectoryServerPlugin p = preOperationDeletePlugins[i];
      if (isInternalOperation(deleteOperation, p))
      {
        continue;
      }

      try
      {
        result = p.doPreOperation(deleteOperation);
      }
      catch (CanceledOperationException coe)
      {
        throw coe;
      }
      catch (Exception e)
      {
        return handlePreOperationException(e, i, preOperationDeletePlugins,
            deleteOperation, p);
      }

      if (result == null)
      {
        return handlePreOperationResult(deleteOperation, i,
            preOperationDeletePlugins, p);
      }
      else if (!result.continuePluginProcessing())
      {
        registerSkippedPreOperationPlugins(i, preOperationDeletePlugins,
            deleteOperation);

        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no pre-operation add plugins
      // registered, which is fine.
      result = PluginResult.PreOperation.continueOperationProcessing();
    }

    return result;
  }

  private PluginResult.PreOperation handlePreOperationException(Exception e,
      int i, DirectoryServerPlugin[] plugins, PreOperationOperation operation,
      DirectoryServerPlugin plugin)
  {
    logger.traceException(e);

    LocalizableMessage message =
        ERR_PLUGIN_PRE_OPERATION_PLUGIN_EXCEPTION.get(operation
            .getOperationType().getOperationName(), plugin
            .getPluginEntryDN(), operation.getConnectionID(), operation
            .getOperationID(), stackTraceToSingleLineString(e));
    logger.error(message);

    registerSkippedPreOperationPlugins(i, plugins, operation);

    return PluginResult.PreOperation.stopProcessing(DirectoryServer
        .getServerErrorResultCode(), message);
  }

  private PluginResult.PreOperation handlePreOperationResult(
      PreOperationOperation operation, int i, DirectoryServerPlugin[] plugins,
      DirectoryServerPlugin plugin)
  {
    LocalizableMessage message =
        ERR_PLUGIN_PRE_OPERATION_PLUGIN_RETURNED_NULL.get(operation
            .getOperationType().getOperationName(), plugin
            .getPluginEntryDN(), operation.getConnectionID(), operation
            .getOperationID());
    logger.error(message);

    registerSkippedPreOperationPlugins(i, plugins, operation);

    return PluginResult.PreOperation.stopProcessing(DirectoryServer
        .getServerErrorResultCode(), message);
  }



  /**
   * Invokes the set of pre-operation extended plugins that have been configured
   * in the Directory Server.
   *
   * @param  extendedOperation  The extended operation for which to invoke the
   *                            pre-operation plugins.
   *
   * @return  The result of processing the pre-operation extended plugins.
   *
   * @throws CanceledOperationException if the operation should be canceled.
   */
  public PluginResult.PreOperation invokePreOperationExtendedPlugins(
                               PreOperationExtendedOperation extendedOperation)
      throws CanceledOperationException {
    PluginResult.PreOperation result = null;

    for (int i = 0; i < preOperationExtendedPlugins.length; i++)
    {
      DirectoryServerPlugin p = preOperationExtendedPlugins[i];
      if (isInternalOperation(extendedOperation, p))
      {
        registerSkippedPreOperationPlugin(p, extendedOperation);
        continue;
      }

      try
      {
        result = p.doPreOperation(extendedOperation);
      }
      catch (CanceledOperationException coe)
      {
        throw coe;
      }
      catch (Exception e)
      {
        return handlePreOperationException(e, i, preOperationExtendedPlugins,
            extendedOperation, p);
      }

      if (result == null)
      {
        return handlePreOperationResult(extendedOperation, i,
            preOperationExtendedPlugins, p);
      }
      else if (!result.continuePluginProcessing())
      {
        registerSkippedPreOperationPlugins(i, preOperationExtendedPlugins,
            extendedOperation);

        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no pre-operation add plugins
      // registered, which is fine.
      result = PluginResult.PreOperation.continueOperationProcessing();
    }

    return result;
  }



  /**
   * Invokes the set of pre-operation modify plugins that have been configured
   * in the Directory Server.
   *
   * @param  modifyOperation  The modify operation for which to invoke the
   *                          pre-operation plugins.
   *
   * @return  The result of processing the pre-operation modify plugins.
   *
   * @throws CanceledOperationException if the operation should be canceled.
   */
  public PluginResult.PreOperation invokePreOperationModifyPlugins(
                                  PreOperationModifyOperation modifyOperation)
      throws CanceledOperationException {
    PluginResult.PreOperation result = null;

    for (int i = 0; i < preOperationModifyPlugins.length; i++)
    {
      DirectoryServerPlugin p = preOperationModifyPlugins[i];
      if (isInternalOperation(modifyOperation, p))
      {
        continue;
      }

      try
      {
        result = p.doPreOperation(modifyOperation);
      }
      catch (CanceledOperationException coe)
      {
        throw coe;
      }
      catch (Exception e)
      {
        return handlePreOperationException(e, i, preOperationModifyPlugins,
            modifyOperation, p);
      }

      if (result == null)
      {
        return handlePreOperationResult(modifyOperation, i,
            preOperationModifyPlugins, p);
      }
      else if (!result.continuePluginProcessing())
      {
        registerSkippedPreOperationPlugins(i, preOperationModifyPlugins,
            modifyOperation);

        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no pre-operation add plugins
      // registered, which is fine.
      result = PluginResult.PreOperation.continueOperationProcessing();
    }

    return result;
  }



  /**
   * Invokes the set of pre-operation modify DN plugins that have been
   * configured in the Directory Server.
   *
   * @param  modifyDNOperation  The modify DN operation for which to invoke the
   *                            pre-operation plugins.
   *
   * @return  The result of processing the pre-operation modify DN plugins.
   *
   * @throws CanceledOperationException if the operation should be canceled.
   */
  public PluginResult.PreOperation invokePreOperationModifyDNPlugins(
                              PreOperationModifyDNOperation modifyDNOperation)
      throws CanceledOperationException {
    PluginResult.PreOperation result = null;

    for (int i = 0; i < preOperationModifyDNPlugins.length; i++)
    {
      DirectoryServerPlugin p = preOperationModifyDNPlugins[i];
      if (isInternalOperation(modifyDNOperation, p))
      {
        continue;
      }

      try
      {
        result = p.doPreOperation(modifyDNOperation);
      }
      catch (CanceledOperationException coe)
      {
        throw coe;
      }
      catch (Exception e)
      {
        return handlePreOperationException(e, i, preOperationModifyDNPlugins,
            modifyDNOperation, p);
      }

      if (result == null)
      {
        return handlePreOperationResult(modifyDNOperation, i,
            preOperationModifyDNPlugins, p);
      }
      else if (!result.continuePluginProcessing())
      {
        registerSkippedPreOperationPlugins(i, preOperationModifyDNPlugins,
            modifyDNOperation);

        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no pre-operation add plugins
      // registered, which is fine.
      result = PluginResult.PreOperation.continueOperationProcessing();
    }

    return result;
  }



  /**
   * Invokes the set of pre-operation search plugins that have been configured
   * in the Directory Server.
   *
   * @param  searchOperation  The search operation for which to invoke the
   *                          pre-operation plugins.
   *
   * @return  The result of processing the pre-operation search plugins.
   *
   * @throws CanceledOperationException if the operation should be canceled.
   */
  public PluginResult.PreOperation invokePreOperationSearchPlugins(
                                  PreOperationSearchOperation searchOperation)
      throws CanceledOperationException {
    PluginResult.PreOperation result = null;

    for (int i = 0; i < preOperationSearchPlugins.length; i++)
    {
      DirectoryServerPlugin p = preOperationSearchPlugins[i];
      if (isInternalOperation(searchOperation, p))
      {
        continue;
      }

      try
      {
        result = p.doPreOperation(searchOperation);
      }
      catch (CanceledOperationException coe)
      {
        throw coe;
      }
      catch (Exception e)
      {
        return handlePreOperationException(e, i, preOperationSearchPlugins,
            searchOperation, p);
      }

      if (result == null)
      {
        return handlePreOperationResult(searchOperation, i,
            preOperationSearchPlugins, p);
      }
      else if (!result.continuePluginProcessing())
      {
        registerSkippedPreOperationPlugins(i, preOperationSearchPlugins,
             searchOperation);

        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no pre-operation add plugins
      // registered, which is fine.
      result = PluginResult.PreOperation.continueOperationProcessing();
    }

    return result;
  }



  /**
   * Invokes the set of post-operation abandon plugins that have been configured
   * in the Directory Server.
   *
   * @param  abandonOperation  The abandon operation for which to invoke the
   *                           post-operation plugins.
   *
   * @return  The result of processing the post-operation abandon plugins.
   */
  public PluginResult.PostOperation invokePostOperationAbandonPlugins(
                              PostOperationAbandonOperation abandonOperation)
  {
    PluginResult.PostOperation result = null;
    PluginResult.PostOperation finalResult = null;

    for (DirectoryServerPlugin p : postOperationAbandonPlugins)
    {
      if (isInternalOperation(abandonOperation, p))
      {
        continue;
      }

      try
      {
        result = p.doPostOperation(abandonOperation);
      }
      catch (Exception e)
      {
        logException(abandonOperation, p, e, ERR_PLUGIN_POST_OPERATION_PLUGIN_EXCEPTION);
      }

      if (result == null)
      {
        logNullResult(abandonOperation, p, ERR_PLUGIN_POST_OPERATION_PLUGIN_RETURNED_NULL);
      }
      else if (!result.continueProcessing())
      {
        // This plugin requested operation processing to stop. However, we
        // still have to invoke all the post op plugins that successfully
        // invoked its pre op plugins. We will just take this plugin's
        // results as the final result.
        finalResult = result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no post-operation add plugins
      // registered, which is fine.
      finalResult = PluginResult.PostOperation.continueOperationProcessing();
    }
    else if(finalResult == null)
    {
      // None of the plugins requested processing to stop so all results
      // have equal priority. Just return the last one.
      finalResult = result;
    }

    return finalResult;
  }



  /**
   * Invokes the set of post-operation add plugins that have been configured in
   * the Directory Server.
   *
   * @param  addOperation  The add operation for which to invoke the
   *                       post-operation plugins.
   *
   * @return  The result of processing the post-operation add plugins.
   */
  public PluginResult.PostOperation invokePostOperationAddPlugins(
                                        PostOperationAddOperation addOperation)
  {
    PluginResult.PostOperation result = null;
    PluginResult.PostOperation finalResult = null;

    ArrayList<DirectoryServerPlugin> skippedPlugins =
        skippedPreOperationPlugins.remove(addOperation);

    for (DirectoryServerPlugin p : postOperationAddPlugins)
    {
      if (isInternalOperation(addOperation, p)
          || isSkipped(skippedPlugins, p))
      {
        continue;
      }

      try
      {
        result = p.doPostOperation(addOperation);
      }
      catch (Exception e)
      {
        logException(addOperation, p, e, ERR_PLUGIN_POST_OPERATION_PLUGIN_EXCEPTION);
      }

      if (result == null)
      {
        logNullResult(addOperation, p, ERR_PLUGIN_POST_OPERATION_PLUGIN_RETURNED_NULL);
      }
      else if (!result.continueProcessing())
      {
        // This plugin requested operation processing to stop. However, we
        // still have to invoke all the post op plugins that successfully
        // invoked its pre op plugins. We will just take this plugin's
        // results as the final result.
        finalResult = result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no post-operation add plugins
      // registered, which is fine.
      finalResult = PluginResult.PostOperation.continueOperationProcessing();
    }
    else if(finalResult == null)
    {
      // None of the plugins requested processing to stop so all results
      // have equal priority. Just return the last one.
      finalResult = result;
    }

    return finalResult;
  }



  /**
   * Invokes the set of post-operation bind plugins that have been configured
   * in the Directory Server.
   *
   * @param  bindOperation  The bind operation for which to invoke the
   *                        post-operation plugins.
   *
   * @return  The result of processing the post-operation bind plugins.
   */
  public PluginResult.PostOperation invokePostOperationBindPlugins(
                                   PostOperationBindOperation bindOperation)
  {
    PluginResult.PostOperation result = null;
    PluginResult.PostOperation finalResult = null;

    ArrayList<DirectoryServerPlugin> skippedPlugins =
        skippedPreOperationPlugins.remove(bindOperation);

    for (DirectoryServerPlugin p : postOperationBindPlugins)
    {
      if (isInternalOperation(bindOperation, p)
          || isSkipped(skippedPlugins, p))
      {
        continue;
      }

      try
      {
        result = p.doPostOperation(bindOperation);
      }
      catch (Exception e)
      {
        logException(bindOperation, p, e, ERR_PLUGIN_POST_OPERATION_PLUGIN_EXCEPTION);
      }

      if (result == null)
      {
        logNullResult(bindOperation, p, ERR_PLUGIN_POST_OPERATION_PLUGIN_RETURNED_NULL);
      }
      else if (!result.continueProcessing())
      {
        // This plugin requested operation processing to stop. However, we
        // still have to invoke all the post op plugins that successfully
        // invoked its pre op plugins. We will just take this plugin's
        // results as the final result.
        finalResult = result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no post-operation add plugins
      // registered, which is fine.
      finalResult = PluginResult.PostOperation.continueOperationProcessing();
    }
    else if(finalResult == null)
    {
      // None of the plugins requested processing to stop so all results
      // have equal priority. Just return the last one.
      finalResult = result;
    }

    return finalResult;
  }



  /**
   * Invokes the set of post-operation compare plugins that have been configured
   * in the Directory Server.
   *
   * @param  compareOperation  The compare operation for which to invoke the
   *                           post-operation plugins.
   *
   * @return  The result of processing the post-operation compare plugins.
   */
  public PluginResult.PostOperation invokePostOperationComparePlugins(
      PostOperationCompareOperation compareOperation)
  {
    PluginResult.PostOperation result = null;
    PluginResult.PostOperation finalResult = null;

    ArrayList<DirectoryServerPlugin> skippedPlugins =
        skippedPreOperationPlugins.remove(compareOperation);

    for (DirectoryServerPlugin p : postOperationComparePlugins)
    {
      if (isInternalOperation(compareOperation, p)
          || isSkipped(skippedPlugins, p))
      {
        continue;
      }

      try
      {
        result = p.doPostOperation(compareOperation);
      }
      catch (Exception e)
      {
        logException(compareOperation, p, e, ERR_PLUGIN_POST_OPERATION_PLUGIN_EXCEPTION);
      }

      if (result == null)
      {
        logNullResult(compareOperation, p, ERR_PLUGIN_POST_OPERATION_PLUGIN_RETURNED_NULL);
      }
      else if (!result.continueProcessing())
      {
        // This plugin requested operation processing to stop. However, we
        // still have to invoke all the post op plugins that successfully
        // invoked its pre op plugins. We will just take this plugin's
        // results as the final result.
        finalResult = result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no post-operation add plugins
      // registered, which is fine.
      finalResult = PluginResult.PostOperation.continueOperationProcessing();
    }
    else if(finalResult == null)
    {
      // None of the plugins requested processing to stop so all results
      // have equal priority. Just return the last one.
      finalResult = result;
    }

    return finalResult;
  }

  private boolean isInternalOperation(PluginOperation op, DirectoryServerPlugin p)
  {
    return op.isInternalOperation() && !p.invokeForInternalOperations();
  }

  private boolean isSkipped(ArrayList<DirectoryServerPlugin> skippedPlugins, DirectoryServerPlugin p)
  {
    return skippedPlugins != null && skippedPlugins.contains(p);
  }

  /**
   * Invokes the set of post-operation delete plugins that have been configured
   * in the Directory Server.
   *
   * @param  deleteOperation  The delete operation for which to invoke the
   *                          post-operation plugins.
   *
   * @return  The result of processing the post-operation delete plugins.
   */
  public PluginResult.PostOperation invokePostOperationDeletePlugins(
                                   PostOperationDeleteOperation deleteOperation)
  {
    PluginResult.PostOperation result = null;
    PluginResult.PostOperation finalResult = null;

    ArrayList<DirectoryServerPlugin> skippedPlugins =
        skippedPreOperationPlugins.remove(deleteOperation);

    for (DirectoryServerPlugin p : postOperationDeletePlugins)
    {
      if (isInternalOperation(deleteOperation, p)
          || isSkipped(skippedPlugins, p))
      {
        continue;
      }

      try
      {
        result = p.doPostOperation(deleteOperation);
      }
      catch (Exception e)
      {
        logException(deleteOperation, p, e, ERR_PLUGIN_POST_OPERATION_PLUGIN_EXCEPTION);
      }

      if (result == null)
      {
        logNullResult(deleteOperation, p, ERR_PLUGIN_POST_OPERATION_PLUGIN_RETURNED_NULL);
      }
      else if (!result.continueProcessing())
      {
        // This plugin requested operation processing to stop. However, we
        // still have to invoke all the post op plugins that successfully
        // invoked its pre op plugins. We will just take this plugin's
        // results as the final result.
        finalResult = result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no post-operation add plugins
      // registered, which is fine.
      finalResult = PluginResult.PostOperation.continueOperationProcessing();
    }
    else if(finalResult == null)
    {
      // None of the plugins requested processing to stop so all results
      // have equal priority. Just return the last one.
      finalResult = result;
    }

    return finalResult;
  }



  /**
   * Invokes the set of post-operation extended plugins that have been
   * configured in the Directory Server.
   *
   * @param  extendedOperation  The extended operation for which to invoke the
   *                            post-operation plugins.
   *
   * @return  The result of processing the post-operation extended plugins.
   */
  public PluginResult.PostOperation invokePostOperationExtendedPlugins(
                             PostOperationExtendedOperation extendedOperation)
  {
    PluginResult.PostOperation result = null;
    PluginResult.PostOperation finalResult = null;

    ArrayList<DirectoryServerPlugin> skippedPlugins =
        skippedPreOperationPlugins.remove(extendedOperation);

    for (DirectoryServerPlugin p : postOperationExtendedPlugins)
    {
      if (isInternalOperation(extendedOperation, p)
          || isSkipped(skippedPlugins, p))
      {
        continue;
      }

      try
      {
        result = p.doPostOperation(extendedOperation);
      }
      catch (Exception e)
      {
        logException(extendedOperation, p, e, ERR_PLUGIN_POST_OPERATION_PLUGIN_EXCEPTION);
      }

      if (result == null)
      {
        logNullResult(extendedOperation, p, ERR_PLUGIN_POST_OPERATION_PLUGIN_RETURNED_NULL);
      }
      else if (!result.continueProcessing())
      {
        // This plugin requested operation processing to stop. However, we
        // still have to invoke all the post op plugins that successfully
        // invoked its pre op plugins. We will just take this plugin's
        // results as the final result.
        finalResult = result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no post-operation add plugins
      // registered, which is fine.
      finalResult = PluginResult.PostOperation.continueOperationProcessing();
    }
    else if(finalResult == null)
    {
      // None of the plugins requested processing to stop so all results
      // have equal priority. Just return the last one.
      finalResult = result;
    }

    return finalResult;
  }



  /**
   * Invokes the set of post-operation modify plugins that have been configured
   * in the Directory Server.
   *
   * @param  modifyOperation  The modify operation for which to invoke the
   *                          post-operation plugins.
   *
   * @return  The result of processing the post-operation modify plugins.
   */
  public PluginResult.PostOperation invokePostOperationModifyPlugins(
                                   PostOperationModifyOperation modifyOperation)
  {
    PluginResult.PostOperation result = null;
    PluginResult.PostOperation finalResult = null;

    ArrayList<DirectoryServerPlugin> skippedPlugins =
        skippedPreOperationPlugins.remove(modifyOperation);

    for (DirectoryServerPlugin p : postOperationModifyPlugins)
    {
      if (isInternalOperation(modifyOperation, p)
          || isSkipped(skippedPlugins, p))
      {
        continue;
      }

      try
      {
        result = p.doPostOperation(modifyOperation);
      }
      catch (Exception e)
      {
        logException(modifyOperation, p, e, ERR_PLUGIN_POST_OPERATION_PLUGIN_EXCEPTION);
      }

      if (result == null)
      {
        logNullResult(modifyOperation, p, ERR_PLUGIN_POST_OPERATION_PLUGIN_RETURNED_NULL);
      }
      else if (!result.continueProcessing())
      {
        // This plugin requested operation processing to stop. However, we
        // still have to invoke all the post op plugins that successfully
        // invoked its pre op plugins. We will just take this plugin's
        // results as the final result.
        finalResult = result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no post-operation add plugins
      // registered, which is fine.
      finalResult = PluginResult.PostOperation.continueOperationProcessing();
    }
    else if(finalResult == null)
    {
      // None of the plugins requested processing to stop so all results
      // have equal priority. Just return the last one.
      finalResult = result;
    }
    return finalResult;
  }



  /**
   * Invokes the set of post-operation modify DN plugins that have been
   * configured in the Directory Server.
   *
   * @param  modifyDNOperation  The modify DN operation for which to invoke the
   *                            post-operation plugins.
   *
   * @return  The result of processing the post-operation modify DN plugins.
   */
  public PluginResult.PostOperation invokePostOperationModifyDNPlugins(
                             PostOperationModifyDNOperation modifyDNOperation)
  {
    PluginResult.PostOperation result = null;
    PluginResult.PostOperation finalResult = null;

    ArrayList<DirectoryServerPlugin> skippedPlugins =
        skippedPreOperationPlugins.remove(modifyDNOperation);

    for (DirectoryServerPlugin p : postOperationModifyDNPlugins)
    {
      if (isInternalOperation(modifyDNOperation, p)
          || isSkipped(skippedPlugins, p))
      {
        continue;
      }

      try
      {
        result = p.doPostOperation(modifyDNOperation);
      }
      catch (Exception e)
      {
        logException(modifyDNOperation, p, e, ERR_PLUGIN_POST_OPERATION_PLUGIN_EXCEPTION);
      }

      if (result == null)
      {
        logNullResult(modifyDNOperation, p, ERR_PLUGIN_POST_OPERATION_PLUGIN_RETURNED_NULL);
      }
      else if (!result.continueProcessing())
      {
        // This plugin requested operation processing to stop. However, we
        // still have to invoke all the post op plugins that successfully
        // invoked its pre op plugins. We will just take this plugin's
        // results as the final result.
        finalResult = result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no post-operation add plugins
      // registered, which is fine.
      finalResult = PluginResult.PostOperation.continueOperationProcessing();
    }
    else if(finalResult == null)
    {
      // None of the plugins requested processing to stop so all results
      // have equal priority. Just return the last one.
      finalResult = result;
    }

    return finalResult;
  }



  /**
   * Invokes the set of post-operation search plugins that have been configured
   * in the Directory Server.
   *
   * @param  searchOperation  The search operation for which to invoke the
   *                          post-operation plugins.
   *
   * @return  The result of processing the post-operation search plugins.
   */
  public PluginResult.PostOperation invokePostOperationSearchPlugins(
                                   PostOperationSearchOperation searchOperation)
  {
    PluginResult.PostOperation result = null;
    PluginResult.PostOperation finalResult = null;

    ArrayList<DirectoryServerPlugin> skippedPlugins =
        skippedPreOperationPlugins.remove(searchOperation);

    for (DirectoryServerPlugin p : postOperationSearchPlugins)
    {
      if (isInternalOperation(searchOperation, p)
          || isSkipped(skippedPlugins, p))
      {
        continue;
      }

      try
      {
        result = p.doPostOperation(searchOperation);
      }
      catch (Exception e)
      {
        logException(searchOperation, p, e, ERR_PLUGIN_POST_OPERATION_PLUGIN_EXCEPTION);
      }

      if (result == null)
      {
        logNullResult(searchOperation, p, ERR_PLUGIN_POST_OPERATION_PLUGIN_RETURNED_NULL);
      }
      else if (!result.continueProcessing())
      {
        // This plugin requested operation processing to stop. However, we
        // still have to invoke all the post op plugins that successfully
        // invoked its pre op plugins. We will just take this plugin's
        // results as the final result.
        finalResult = result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no post-operation add plugins
      // registered, which is fine.
      finalResult = PluginResult.PostOperation.continueOperationProcessing();
    }
    else if(finalResult == null)
    {
      // None of the plugins requested processing to stop so all results
      // have equal priority. Just return the last one.
      finalResult = result;
    }

    return finalResult;
  }



  /**
   * Invokes the set of post-operation unbind plugins that have been configured
   * in the Directory Server.
   *
   * @param  unbindOperation  The unbind operation for which to invoke the
   *                          post-operation plugins.
   *
   * @return  The result of processing the post-operation unbind plugins.
   */
  public PluginResult.PostOperation invokePostOperationUnbindPlugins(
                                 PostOperationUnbindOperation unbindOperation)
  {
    PluginResult.PostOperation result = null;
    PluginResult.PostOperation finalResult = null;

    ArrayList<DirectoryServerPlugin> skippedPlugins =
        skippedPreOperationPlugins.remove(unbindOperation);

    for (DirectoryServerPlugin p : postOperationUnbindPlugins)
    {
      if (isInternalOperation(unbindOperation, p)
          || isSkipped(skippedPlugins, p))
      {
        continue;
      }

      try
      {
        result = p.doPostOperation(unbindOperation);
      }
      catch (Exception e)
      {
        logException(unbindOperation, p, e, ERR_PLUGIN_POST_OPERATION_PLUGIN_EXCEPTION);
      }

      if (result == null)
      {
        logNullResult(unbindOperation, p, ERR_PLUGIN_POST_OPERATION_PLUGIN_RETURNED_NULL);
      }
      else if (!result.continueProcessing())
      {
        // This plugin requested operation processing to stop. However, we
        // still have to invoke all the post op plugins that successfully
        // invoked its pre op plugins. We will just take this plugin's
        // results as the final result.
        finalResult = result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no post-operation add plugins
      // registered, which is fine.
      finalResult = PluginResult.PostOperation.continueOperationProcessing();
    }
    else if(finalResult == null)
    {
      // None of the plugins requested processing to stop so all results
      // have equal priority. Just return the last one.
      finalResult = result;
    }

    return finalResult;
  }



  /**
   * Invokes the set of post-response add plugins that have been configured in
   * the Directory Server.
   *
   * @param  addOperation  The add operation for which to invoke the
   *                       post-response plugins.
   *
   * @return  The result of processing the post-response add plugins.
   */
  public PluginResult.PostResponse invokePostResponseAddPlugins(
                                       PostResponseAddOperation addOperation)
  {
    PluginResult.PostResponse result = null;

    for (DirectoryServerPlugin p : postResponseAddPlugins)
    {
      if (isInternalOperation(addOperation, p))
      {
        continue;
      }

      try
      {
        result = p.doPostResponse(addOperation);
      }
      catch (Exception e)
      {
        logException(addOperation, p, e, ERR_PLUGIN_POST_RESPONSE_PLUGIN_EXCEPTION);
      }

      if (result == null)
      {
        logNullResult(addOperation, p, ERR_PLUGIN_POST_RESPONSE_PLUGIN_RETURNED_NULL);
      }
      else if (!result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no post-response add plugins
      // registered, which is fine.
      result = PluginResult.PostResponse.continueOperationProcessing();
    }

    return result;
  }



  /**
   * Invokes the set of post-response bind plugins that have been configured in
   * the Directory Server.
   *
   * @param  bindOperation  The bind operation for which to invoke the
   *                        post-response plugins.
   *
   * @return  The result of processing the post-response bind plugins.
   */
  public PluginResult.PostResponse invokePostResponseBindPlugins(
                                       PostResponseBindOperation bindOperation)
  {
    PluginResult.PostResponse result = null;

    for (DirectoryServerPlugin p : postResponseBindPlugins)
    {
      if (isInternalOperation(bindOperation, p))
      {
        continue;
      }

      try
      {
        result = p.doPostResponse(bindOperation);
      }
      catch (Exception e)
      {
        logException(bindOperation, p, e, ERR_PLUGIN_POST_RESPONSE_PLUGIN_EXCEPTION);
      }

      if (result == null)
      {
        logNullResult(bindOperation, p, ERR_PLUGIN_POST_RESPONSE_PLUGIN_RETURNED_NULL);
      }
      else if (!result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no post-response add plugins
      // registered, which is fine.
      result = PluginResult.PostResponse.continueOperationProcessing();
    }

    return result;
  }



  /**
   * Invokes the set of post-response compare plugins that have been configured
   * in the Directory Server.
   *
   * @param  compareOperation  The compare operation for which to invoke the
   *                           post-response plugins.
   *
   * @return  The result of processing the post-response compare plugins.
   */
  public PluginResult.PostResponse invokePostResponseComparePlugins(
      PostResponseCompareOperation compareOperation)
  {
    PluginResult.PostResponse result = null;

    for (DirectoryServerPlugin p : postResponseComparePlugins)
    {
      if (isInternalOperation(compareOperation, p))
      {
        continue;
      }

      try
      {
        result = p.doPostResponse(compareOperation);
      }
      catch (Exception e)
      {
        logException(compareOperation, p, e, ERR_PLUGIN_POST_RESPONSE_PLUGIN_EXCEPTION);
      }

      if (result == null)
      {
        logNullResult(compareOperation, p, ERR_PLUGIN_POST_RESPONSE_PLUGIN_RETURNED_NULL);
      }
      else if (!result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no post-response add plugins
      // registered, which is fine.
      result = PluginResult.PostResponse.continueOperationProcessing();
    }

    return result;
  }

  /**
   * Invokes the set of post-response delete plugins that have been configured
   * in the Directory Server.
   *
   * @param  deleteOperation  The delete operation for which to invoke the
   *                          post-response plugins.
   *
   * @return  The result of processing the post-response delete plugins.
   */
  public PluginResult.PostResponse invokePostResponseDeletePlugins(
                          PostResponseDeleteOperation deleteOperation)
  {
    PluginResult.PostResponse result = null;

    for (DirectoryServerPlugin p : postResponseDeletePlugins)
    {
      if (isInternalOperation(deleteOperation, p))
      {
        continue;
      }

      try
      {
        result = p.doPostResponse(deleteOperation);
      }
      catch (Exception e)
      {
        logException(deleteOperation, p, e, ERR_PLUGIN_POST_RESPONSE_PLUGIN_EXCEPTION);
      }

      if (result == null)
      {
        logNullResult(deleteOperation, p, ERR_PLUGIN_POST_RESPONSE_PLUGIN_RETURNED_NULL);
      }
      else if (!result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no post-response add plugins
      // registered, which is fine.
      result = PluginResult.PostResponse.continueOperationProcessing();
    }
    return result;
  }



  /**
   * Invokes the set of post-response extended plugins that have been configured
   * in the Directory Server.
   *
   * @param  extendedOperation  The extended operation for which to invoke the
   *                            post-response plugins.
   *
   * @return  The result of processing the post-response extended plugins.
   */
  public PluginResult.PostResponse invokePostResponseExtendedPlugins(
                              PostResponseExtendedOperation extendedOperation)
  {
    PluginResult.PostResponse result = null;

    for (DirectoryServerPlugin p : postResponseExtendedPlugins)
    {
      if (isInternalOperation(extendedOperation, p))
      {
        continue;
      }

      try
      {
        result = p.doPostResponse(extendedOperation);
      }
      catch (Exception e)
      {
        logException(extendedOperation, p, e, ERR_PLUGIN_POST_RESPONSE_PLUGIN_EXCEPTION);
      }

      if (result == null)
      {
        logNullResult(extendedOperation, p, ERR_PLUGIN_POST_RESPONSE_PLUGIN_RETURNED_NULL);
      }
      else if (!result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no post-response add plugins
      // registered, which is fine.
      result = PluginResult.PostResponse.continueOperationProcessing();
    }

    return result;
  }



  /**
   * Invokes the set of post-response modify plugins that have been configured
   * in the Directory Server.
   *
   * @param  modifyOperation  The modify operation for which to invoke the
   *                          post-response plugins.
   *
   * @return  The result of processing the post-response modify plugins.
   */
  public PluginResult.PostResponse invokePostResponseModifyPlugins(
                                  PostResponseModifyOperation modifyOperation)
  {
    PluginResult.PostResponse result = null;

    for (DirectoryServerPlugin p : postResponseModifyPlugins)
    {
      if (isInternalOperation(modifyOperation, p))
      {
        continue;
      }

      try
      {
        result = p.doPostResponse(modifyOperation);
      }
      catch (Exception e)
      {
        logException(modifyOperation, p, e, ERR_PLUGIN_POST_RESPONSE_PLUGIN_EXCEPTION);
      }

      if (result == null)
      {
        logNullResult(modifyOperation, p, ERR_PLUGIN_POST_RESPONSE_PLUGIN_RETURNED_NULL);
      }
      else if (!result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no post-response add plugins
      // registered, which is fine.
      result = PluginResult.PostResponse.continueOperationProcessing();
    }

    return result;
  }



  /**
   * Invokes the set of post-response modify DN plugins that have been
   * configured in the Directory Server.
   *
   * @param  modifyDNOperation  The modify DN operation for which to invoke the
   *                            post-response plugins.
   *
   * @return  The result of processing the post-response modify DN plugins.
   */
  public PluginResult.PostResponse invokePostResponseModifyDNPlugins(
                               PostResponseModifyDNOperation modifyDNOperation)
  {
    PluginResult.PostResponse result = null;

    for (DirectoryServerPlugin p : postResponseModifyDNPlugins)
    {
      if (isInternalOperation(modifyDNOperation, p))
      {
        continue;
      }

      try
      {
        result = p.doPostResponse(modifyDNOperation);
      }
      catch (Exception e)
      {
        logException(modifyDNOperation, p, e, ERR_PLUGIN_POST_RESPONSE_PLUGIN_EXCEPTION);
      }

      if (result == null)
      {
        logNullResult(modifyDNOperation, p, ERR_PLUGIN_POST_RESPONSE_PLUGIN_RETURNED_NULL);
      }
      else if (!result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no post-response add plugins
      // registered, which is fine.
      result = PluginResult.PostResponse.continueOperationProcessing();
    }

    return result;
  }



  /**
   * Invokes the set of post-response search plugins that have been configured
   * in the Directory Server.
   *
   * @param  searchOperation  The search operation for which to invoke the
   *                          post-response plugins.
   *
   * @return  The result of processing the post-response search plugins.
   */
  public PluginResult.PostResponse invokePostResponseSearchPlugins(
                                  PostResponseSearchOperation searchOperation)
  {
    PluginResult.PostResponse result = null;

    for (DirectoryServerPlugin p : postResponseSearchPlugins)
    {
      if (isInternalOperation(searchOperation, p))
      {
        continue;
      }

      try
      {
        result = p.doPostResponse(searchOperation);
      }
      catch (Exception e)
      {
        logException(searchOperation, p, e, ERR_PLUGIN_POST_RESPONSE_PLUGIN_EXCEPTION);
      }

      if (result == null)
      {
        logNullResult(searchOperation, p, ERR_PLUGIN_POST_RESPONSE_PLUGIN_RETURNED_NULL);
      }
      else if (!result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no post-response add plugins
      // registered, which is fine.
      result = PluginResult.PostResponse.continueOperationProcessing();
    }

    return result;
  }

  private void logException(PluginOperation op, DirectoryServerPlugin p, Exception e,
      Arg5<Object, Object, Number, Number, Object> errorMsg)
  {
    logger.traceException(e);
    logger.error(errorMsg,
            op.getOperationType().getOperationName(),
            p.getPluginEntryDN(),
            op.getConnectionID(), op.getOperationID(),
            stackTraceToSingleLineString(e));
  }

  private void logNullResult(PluginOperation op, DirectoryServerPlugin p,
      Arg4<Object, Object, Number, Number> nullResultMsg)
  {
    logger.error(nullResultMsg,
            op.getOperationType().getOperationName(),
            p.getPluginEntryDN(),
            op.getConnectionID(), op.getOperationID());
  }

  /**
   * Invokes the set of post-synchronization add plugins that have been
   * configured in the Directory Server.
   *
   * @param  addOperation  The add operation for which to invoke the
   *                       post-synchronization plugins.
   */
  public void invokePostSynchronizationAddPlugins(
                   PostSynchronizationAddOperation addOperation)
  {
    for (DirectoryServerPlugin p : postSynchronizationAddPlugins)
    {
      try
      {
        p.doPostSynchronization(addOperation);
      }
      catch (Exception e)
      {
        logException(addOperation, p, e, ERR_PLUGIN_POST_SYNCHRONIZATION_PLUGIN_EXCEPTION);
      }
    }
  }



  /**
   * Invokes the set of post-synchronization delete plugins that have been
   * configured in the Directory Server.
   *
   * @param  deleteOperation  The delete operation for which to invoke the
   *                          post-synchronization plugins.
   */
  public void invokePostSynchronizationDeletePlugins(
                   PostSynchronizationDeleteOperation deleteOperation)
  {
    for (DirectoryServerPlugin p : postSynchronizationDeletePlugins)
    {
      try
      {
        p.doPostSynchronization(deleteOperation);
      }
      catch (Exception e)
      {
        logException(deleteOperation, p, e, ERR_PLUGIN_POST_SYNCHRONIZATION_PLUGIN_EXCEPTION);
      }
    }
  }

  /**
   * Invokes the set of post-synchronization modify plugins that have been
   * configured in the Directory Server.
   *
   * @param  modifyOperation  The modify operation for which to invoke the
   *                          post-synchronization plugins.
   */
  public void invokePostSynchronizationModifyPlugins(
                   PostSynchronizationModifyOperation modifyOperation)
  {
    for (DirectoryServerPlugin p : postSynchronizationModifyPlugins)
    {
      try
      {
        p.doPostSynchronization(modifyOperation);
      }
      catch (Exception e)
      {
        logException(modifyOperation, p, e, ERR_PLUGIN_POST_SYNCHRONIZATION_PLUGIN_EXCEPTION);
      }
    }
  }



  /**
   * Invokes the set of post-synchronization modify DN plugins that have been
   * configured in the Directory Server.
   *
   * @param  modifyDNOperation  The modify DN operation for which to invoke the
   *                            post-synchronization plugins.
   */
  public void invokePostSynchronizationModifyDNPlugins(
                   PostSynchronizationModifyDNOperation modifyDNOperation)
  {
    for (DirectoryServerPlugin p : postSynchronizationModifyDNPlugins)
    {
      try
      {
        p.doPostSynchronization(modifyDNOperation);
      }
      catch (Exception e)
      {
        logException(modifyDNOperation, p, e, ERR_PLUGIN_POST_SYNCHRONIZATION_PLUGIN_EXCEPTION);
      }
    }
  }



  /**
   * Invokes the set of search result entry plugins that have been configured
   * in the Directory Server.
   *
   * @param  searchOperation  The search operation for which to invoke the
   *                          search result entry plugins.
   * @param  searchEntry      The search result entry to be processed.
   *
   * @return  The result of processing the search result entry plugins.
   */
  public PluginResult.IntermediateResponse invokeSearchResultEntryPlugins(
      SearchEntrySearchOperation searchOperation,
      SearchResultEntry searchEntry)
  {
    PluginResult.IntermediateResponse result = null;

    for (DirectoryServerPlugin p : searchResultEntryPlugins)
    {
      if (isInternalOperation(searchOperation, p))
      {
        continue;
      }

      try
      {
        result = p.processSearchEntry(searchOperation, searchEntry);
      }
      catch (Exception e)
      {
        logger.traceException(e);

        LocalizableMessage message = ERR_PLUGIN_SEARCH_ENTRY_PLUGIN_EXCEPTION.
            get(p.getPluginEntryDN(),
                searchOperation.getConnectionID(),
                searchOperation.getOperationID(),
                searchEntry.getName(),
                stackTraceToSingleLineString(e));
        logger.error(message);

        return PluginResult.IntermediateResponse.stopProcessing(false,
            DirectoryServer.getServerErrorResultCode(), message);
      }

      if (result == null)
      {
        LocalizableMessage message = ERR_PLUGIN_SEARCH_ENTRY_PLUGIN_RETURNED_NULL.
            get(p.getPluginEntryDN(),
                searchOperation.getConnectionID(),
                searchOperation.getOperationID(),
                searchEntry.getName());
        logger.error(message);

        return PluginResult.IntermediateResponse.stopProcessing(false,
            DirectoryServer.getServerErrorResultCode(), message);
      }
      else if (! result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no search result entry plugins
      // registered, which is fine.
      result =
          PluginResult.IntermediateResponse.continueOperationProcessing(true);
    }

    return result;
  }



  /**
   * Invokes the set of search result reference plugins that have been
   * configured in the Directory Server.
   *
   * @param  searchOperation  The search operation for which to invoke the
   *                          search result reference plugins.
   * @param  searchReference  The search result reference to be processed.
   *
   * @return  The result of processing the search result reference plugins.
   */
  public PluginResult.IntermediateResponse invokeSearchResultReferencePlugins(
      SearchReferenceSearchOperation searchOperation,
      SearchResultReference searchReference)
  {
    PluginResult.IntermediateResponse result = null;

    for (DirectoryServerPlugin p : searchResultReferencePlugins)
    {
      if (isInternalOperation(searchOperation, p))
      {
        continue;
      }

      try
      {
        result = p.processSearchReference(searchOperation, searchReference);
      }
      catch (Exception e)
      {
        logger.traceException(e);

        LocalizableMessage message = ERR_PLUGIN_SEARCH_REFERENCE_PLUGIN_EXCEPTION.
            get(p.getPluginEntryDN(),
                searchOperation.getConnectionID(),
                searchOperation.getOperationID(),
                searchReference.getReferralURLString(),
                stackTraceToSingleLineString(e));
        logger.error(message);

        return PluginResult.IntermediateResponse.stopProcessing(false,
            DirectoryServer.getServerErrorResultCode(), message);
      }

      if (result == null)
      {
        LocalizableMessage message = ERR_PLUGIN_SEARCH_REFERENCE_PLUGIN_RETURNED_NULL.
            get(p.getPluginEntryDN(),
                searchOperation.getConnectionID(),
                searchOperation.getOperationID(),
                searchReference.getReferralURLString());
        logger.error(message);

        return PluginResult.IntermediateResponse.stopProcessing(false,
            DirectoryServer.getServerErrorResultCode(), message);
      }
      else if (! result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no search result reference
      // plugins registered, which is fine.
      result =
          PluginResult.IntermediateResponse.continueOperationProcessing(true);
    }

    return result;
  }



  /**
   * Invokes the set of subordinate modify DN plugins that have been configured
   * in the Directory Server.
   *
   * @param  modifyDNOperation  The modify DN operation with which the
   *                            subordinate entry is associated.
   * @param  oldEntry           The subordinate entry prior to the move/rename
   *                            operation.
   * @param  newEntry           The subordinate entry after the move/rename
   *                            operation.
   * @param  modifications      A list into which any modifications made to the
   *                            target entry should be placed.
   *
   * @return  The result of processing the subordinate modify DN plugins.
   */
  public PluginResult.SubordinateModifyDN invokeSubordinateModifyDNPlugins(
              SubordinateModifyDNOperation modifyDNOperation, Entry oldEntry,
              Entry newEntry, List<Modification> modifications)
  {
    PluginResult.SubordinateModifyDN result = null;

    for (DirectoryServerPlugin p : subordinateModifyDNPlugins)
    {
      if (isInternalOperation(modifyDNOperation, p))
      {
        continue;
      }

      try
      {
        result = p.processSubordinateModifyDN(modifyDNOperation, oldEntry,
                                               newEntry, modifications);
      }
      catch (Exception e)
      {
        logger.traceException(e);

        LocalizableMessage message =
            ERR_PLUGIN_SUBORDINATE_MODIFY_DN_PLUGIN_EXCEPTION.get(
                p.getPluginEntryDN(),
                modifyDNOperation.getConnectionID(),
                modifyDNOperation.getOperationID(),
                stackTraceToSingleLineString(e));
        logger.error(message);

        return PluginResult.SubordinateModifyDN.stopProcessing(
            DirectoryServer.getServerErrorResultCode(), message);
      }

      if (result == null)
      {
        LocalizableMessage message =
            ERR_PLUGIN_SUBORDINATE_MODIFY_DN_PLUGIN_RETURNED_NULL.get(
                        p.getPluginEntryDN(),
                        modifyDNOperation.getConnectionID(),
                        modifyDNOperation.getOperationID());
        logger.error(message);

        return PluginResult.SubordinateModifyDN.stopProcessing(
            DirectoryServer.getServerErrorResultCode(), message);
      }
      else if (! result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no subordinate modify DN plugins
      // registered, which is fine.
      result = PluginResult.SubordinateModifyDN.continueOperationProcessing();
    }

    return result;
  }



  /**
   * Invokes the set of subordinate delete plugins that have been configured
   * in the Directory Server.
   *
   * @param  deleteOperation  The delete operation with which the
   *                          subordinate entry is associated.
   * @param  entry            The subordinate entry being deleted.
   *
   * @return The result of processing the subordinate delete plugins.
   */
  public PluginResult.SubordinateDelete invokeSubordinateDeletePlugins(
              DeleteOperation deleteOperation, Entry entry)
  {
    PluginResult.SubordinateDelete result = null;

    for (DirectoryServerPlugin p : subordinateDeletePlugins)
    {
      if (deleteOperation.isInternalOperation() && !p.invokeForInternalOperations())
      {
        continue;
      }

      try
      {
        result = p.processSubordinateDelete(deleteOperation, entry);
      }
      catch (Exception e)
      {
        logger.traceException(e);

        LocalizableMessage message =
            ERR_PLUGIN_SUBORDINATE_DELETE_PLUGIN_EXCEPTION.get(
                p.getPluginEntryDN(),
                deleteOperation.getConnectionID(),
                deleteOperation.getOperationID(),
                stackTraceToSingleLineString(e));
        logger.error(message);

        return PluginResult.SubordinateDelete.stopProcessing(
            DirectoryServer.getServerErrorResultCode(), message);
      }

      if (result == null)
      {
        LocalizableMessage message =
            ERR_PLUGIN_SUBORDINATE_DELETE_PLUGIN_RETURNED_NULL.get(
                        p.getPluginEntryDN(),
                        deleteOperation.getConnectionID(),
                        deleteOperation.getOperationID());
        logger.error(message);

        return PluginResult.SubordinateDelete.stopProcessing(
            DirectoryServer.getServerErrorResultCode(), message);
      }
      else if (! result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no subordinate modify DN plugins
      // registered, which is fine.
      result = PluginResult.SubordinateDelete.continueOperationProcessing();
    }

    return result;
  }



  /**
   * Invokes the set of intermediate response plugins that have been configured
   * in the Directory Server.
   *
   * @param  intermediateResponse  The intermediate response for which to invoke
   *                               the intermediate response plugins.
   *
   * @return  The result of processing the intermediate response plugins.
   */
  public PluginResult.IntermediateResponse
              invokeIntermediateResponsePlugins(
                   IntermediateResponse intermediateResponse)
  {
    PluginResult.IntermediateResponse result = null;
    Operation operation = intermediateResponse.getOperation();

    for (DirectoryServerPlugin p : intermediateResponsePlugins)
    {
      try
      {
        result = p.processIntermediateResponse(intermediateResponse);
      }
      catch (Exception e)
      {
        logger.traceException(e);

        LocalizableMessage message = ERR_PLUGIN_INTERMEDIATE_RESPONSE_PLUGIN_EXCEPTION.
            get(p.getPluginEntryDN(),
                operation.getConnectionID(), operation.getOperationID(),
                stackTraceToSingleLineString(e));
        logger.error(message);

        return PluginResult.IntermediateResponse.stopProcessing
            (false, DirectoryServer.getServerErrorResultCode(), message);
      }

      if (result == null)
      {
        LocalizableMessage message = ERR_PLUGIN_INTERMEDIATE_RESPONSE_PLUGIN_RETURNED_NULL.
            get(p.getPluginEntryDN(),
                operation.getConnectionID(), operation.getOperationID());
        logger.error(message);

        return PluginResult.IntermediateResponse.stopProcessing
            (false, DirectoryServer.getServerErrorResultCode(), message);
      }
      else if (! result.continuePluginProcessing())
      {
        return result;
      }
    }

    if (result == null)
    {
      // This should only happen if there were no intermediate response plugins
      // registered, which is fine.WARN

      result =
          PluginResult.IntermediateResponse.continueOperationProcessing(true);
    }

    return result;
  }



  /** {@inheritDoc} */
  @Override
  public boolean isConfigurationAddAcceptable(PluginCfg configuration,
                                              List<LocalizableMessage> unacceptableReasons)
  {
    if (configuration.isEnabled())
    {
      HashSet<PluginType> pluginTypes = getPluginTypes(configuration);

      // Get the name of the class and make sure we can instantiate it as a plugin.
      String className = configuration.getJavaClass();
      try
      {
        loadPlugin(className, pluginTypes, configuration, false);
      }
      catch (InitializationException ie)
      {
        unacceptableReasons.add(ie.getMessageObject());
        return false;
      }
    }

    // If we've gotten here, then it's fine.
    return true;
  }



  /** {@inheritDoc} */
  @Override
  public ConfigChangeResult applyConfigurationAdd(
                                 PluginCfg configuration)
  {
    final ConfigChangeResult ccr = new ConfigChangeResult();

    configuration.addChangeListener(this);

    if (! configuration.isEnabled())
    {
      return ccr;
    }

    HashSet<PluginType> pluginTypes = getPluginTypes(configuration);

    // Get the name of the class and make sure we can instantiate it as a plugin.
    DirectoryServerPlugin<? extends PluginCfg> plugin = null;
    String className = configuration.getJavaClass();
    try
    {
      plugin = loadPlugin(className, pluginTypes, configuration, true);
    }
    catch (InitializationException ie)
    {
      ccr.setResultCodeIfSuccess(DirectoryServer.getServerErrorResultCode());
      ccr.addMessage(ie.getMessageObject());
    }

    if (ccr.getResultCode() == ResultCode.SUCCESS)
    {
      registerPlugin(plugin, configuration.dn(), pluginTypes);
    }

    return ccr;
  }



  /** {@inheritDoc} */
  @Override
  public boolean isConfigurationDeleteAcceptable(
                      PluginCfg configuration,
                      List<LocalizableMessage> unacceptableReasons)
  {
    // We will always allow plugins to be removed.
    return true;
  }



  /** {@inheritDoc} */
  @Override
  public ConfigChangeResult applyConfigurationDelete(
                                 PluginCfg configuration)
  {
    final ConfigChangeResult ccr = new ConfigChangeResult();

    deregisterPlugin(configuration.dn());

    return ccr;
  }



  /** {@inheritDoc} */
  @Override
  public boolean isConfigurationChangeAcceptable(
                      PluginCfg configuration,
                      List<LocalizableMessage> unacceptableReasons)
  {
    if (configuration.isEnabled())
    {
      HashSet<PluginType> pluginTypes = getPluginTypes(configuration);

      // Get the name of the class and make sure we can instantiate it as a plugin.
      String className = configuration.getJavaClass();
      try
      {
        loadPlugin(className, pluginTypes, configuration, false);
      }
      catch (InitializationException ie)
      {
        unacceptableReasons.add(ie.getMessageObject());
        return false;
      }
    }

    // If we've gotten here, then it's fine.
    return true;
  }



  /** {@inheritDoc} */
  @Override
  public ConfigChangeResult applyConfigurationChange(
                                 PluginCfg configuration)
  {
    final ConfigChangeResult ccr = new ConfigChangeResult();


    // Get the existing plugin if it's already enabled.
    DirectoryServerPlugin existingPlugin =
         registeredPlugins.get(configuration.dn());


    // If the new configuration has the plugin disabled, then deregister it if
    // it is enabled, or do nothing if it's already disabled.
    if (! configuration.isEnabled())
    {
      if (existingPlugin != null)
      {
        deregisterPlugin(configuration.dn());
      }

      return ccr;
    }


    // Get the class for the identity mapper.  If the mapper is already enabled,
    // then we shouldn't do anything with it although if the class has changed
    // then we'll at least need to indicate that administrative action is
    // required.  If the mapper is disabled, then instantiate the class and
    // initialize and register it as an identity mapper.  Also, update the
    // plugin to indicate whether it should be invoked for internal operations.
    String className = configuration.getJavaClass();
    if (existingPlugin != null)
    {
      if (! className.equals(existingPlugin.getClass().getName()))
      {
        ccr.setAdminActionRequired(true);
      }

      existingPlugin.setInvokeForInternalOperations(
                          configuration.isInvokeForInternalOperations());

      return ccr;
    }

    // Create a set of plugin types for the plugin.
    HashSet<PluginType> pluginTypes = getPluginTypes(configuration);

    DirectoryServerPlugin<? extends PluginCfg> plugin = null;
    try
    {
      plugin = loadPlugin(className, pluginTypes, configuration, true);
    }
    catch (InitializationException ie)
    {
      ccr.setResultCodeIfSuccess(DirectoryServer.getServerErrorResultCode());
      ccr.addMessage(ie.getMessageObject());
    }

    if (ccr.getResultCode() == ResultCode.SUCCESS)
    {
      registerPlugin(plugin, configuration.dn(), pluginTypes);
    }

    return ccr;
  }

  private HashSet<PluginType> getPluginTypes(PluginCfg configuration)
  {
    HashSet<PluginType> pluginTypes = new HashSet<>();
    for (PluginCfgDefn.PluginType pluginType : configuration.getPluginType())
    {
      pluginTypes.add(getPluginType(pluginType));
    }
    return pluginTypes;
  }

  private void registerSkippedPreOperationPlugins(int i,
                                                DirectoryServerPlugin[] plugins,
                                                 PluginOperation operation)
  {
    ArrayList<DirectoryServerPlugin> skippedPlugins = new ArrayList<>(plugins.length - i);
    for(int j = i; j < plugins.length; j++)
    {
      skippedPlugins.add(plugins[j]);
    }
    skippedPreOperationPlugins.put(operation, skippedPlugins);
  }

  private void registerSkippedPreOperationPlugin(DirectoryServerPlugin plugin,
                                                 PluginOperation operation)
  {
    ArrayList<DirectoryServerPlugin> existingList =
        skippedPreOperationPlugins.get(operation);
    if(existingList == null)
    {
      existingList = new ArrayList<>();
    }
    existingList.add(plugin);
    skippedPreOperationPlugins.put(operation, existingList);
  }
}