/**
* 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.lucene.gdata.server.registry;
import java.util.ArrayList;
import java.util.List;
import org.apache.lucene.gdata.data.ServerBaseEntry;
import org.apache.lucene.gdata.data.ServerBaseFeed;
/**
* This class will be informed about every successful entry event and
* distributes all event to all registered
* {@link org.apache.lucene.gdata.server.registry.EntryEventListener}
*
* @author Simon Willnauer
*
*/
public abstract class EntryEventMediator {
private final List<EntryEventListener> entryEventListener = new ArrayList<EntryEventListener>(
5);
/**
* @return - a entry event mediator instance
*/
public abstract EntryEventMediator getEntryEventMediator();
/**
* Registers a {@link EntryEventListener}. This listener will be fired if an
* entry update, insert or delete occurs
*
* @param listener -
* listener to register
*/
public void registerEntryEventListener(final EntryEventListener listener) {
if (listener == null || this.entryEventListener.contains(listener))
return;
this.entryEventListener.add(listener);
}
/**
* @param entry -
* the updated entry
*/
public void entryUpdated(final ServerBaseEntry entry) {
for (EntryEventListener listener : this.entryEventListener) {
listener.fireUpdateEvent(entry);
}
}
/**
* @param entry -
* the added entry
*/
public void entryAdded(final ServerBaseEntry entry) {
for (EntryEventListener listener : this.entryEventListener) {
listener.fireInsertEvent(entry);
}
}
/**
* @param feed - the feed to delete all entries for
*/
public void allEntriesDeleted(final ServerBaseFeed feed){
for (EntryEventListener listener : this.entryEventListener) {
listener.fireDeleteAllEntries(feed);
}
}
/**
* @param entry -
* the deleted entry
*/
public void entryDeleted(final ServerBaseEntry entry) {
for (EntryEventListener listener : this.entryEventListener) {
listener.fireDeleteEvent(entry);
}
}
/**
* checks if the listener is already registered.
* @param listner - the listener to check
* @return <code>true</code> if and only if the given listener is already registered, otherwise <code>false</code>.
*/
public boolean isListenerRegistered(final EntryEventListener listner){
return listner!=null&&this.entryEventListener.contains(listner);
}
}
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