/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
package org.apache.directory.server.core.event;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import org.apache.directory.server.core.api.DirectoryService;
import org.apache.directory.server.core.api.event.DirectoryListener;
import org.apache.directory.server.core.api.event.EventService;
import org.apache.directory.server.core.api.event.NotificationCriteria;
import org.apache.directory.server.core.api.event.RegistrationEntry;
import org.apache.directory.server.core.api.normalization.FilterNormalizingVisitor;
import org.apache.directory.shared.ldap.model.filter.ExprNode;
import org.apache.directory.shared.ldap.model.schema.SchemaManager;
import org.apache.directory.shared.ldap.model.schema.normalizers.ConcreteNameComponentNormalizer;
import org.apache.directory.shared.ldap.model.schema.normalizers.NameComponentNormalizer;
/**
* A class implementing the EventService interface. It stores all the Listener
* associated with a DirectoryService.
*
* @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
*/
class DefaultEventService implements EventService
{
/** The list of RegistrationEntries being registered */
private List<RegistrationEntry> registrations = new CopyOnWriteArrayList<RegistrationEntry>();
/** The DirectoryService instance */
private DirectoryService directoryService;
/** A normalizer used for filters */
private FilterNormalizingVisitor filterNormalizer;
/**
* Create an instance of EventService
* @param directoryService The associated DirectoryService
* @param registrations The list of Registrations
*/
public DefaultEventService( DirectoryService directoryService )
{
this.directoryService = directoryService;
SchemaManager schemaManager = directoryService.getSchemaManager();
NameComponentNormalizer ncn = new ConcreteNameComponentNormalizer( schemaManager );
filterNormalizer = new FilterNormalizingVisitor( ncn, schemaManager );
}
/**
* {@inheritDoc}
*/
public void addListener( DirectoryListener listener, NotificationCriteria criteria ) throws Exception
{
criteria.getBase().apply( directoryService.getSchemaManager() );
ExprNode result = ( ExprNode ) criteria.getFilter().accept( filterNormalizer );
criteria.setFilter( result );
registrations.add( new RegistrationEntry( listener, criteria ) );
}
/**
* {@inheritDoc}
*/
public void removeListener( DirectoryListener listener )
{
for ( RegistrationEntry entry : registrations )
{
if ( entry.getListener() == listener )
{
registrations.remove( entry );
}
}
}
/**
* {@inheritDoc}
*/
public List<RegistrationEntry> getRegistrationEntries()
{
return Collections.unmodifiableList( registrations );
}
}