| /****************************************************************************** |
| * Copyright (c) 2008 Oracle |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Konstantin Komissarchik - initial implementation and ongoing maintenance |
| ******************************************************************************/ |
| |
| package org.eclipse.wst.common.project.facet.core.util.internal; |
| |
| import java.util.EnumMap; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.concurrent.CopyOnWriteArraySet; |
| |
| import org.eclipse.wst.common.project.facet.core.internal.FacetCorePlugin; |
| |
| /** |
| * @author <a href="mailto:konstantin.komissarchik@oracle.com">Konstantin Komissarchik</a> |
| */ |
| |
| public abstract class AbstractListenerRegistry<T extends Enum<T>,E,L> |
| { |
| private final Class<T> eventTypeClass; |
| private final Map<T,Set<L>> listeners; |
| |
| public AbstractListenerRegistry( final Class<T> eventTypeClass ) |
| { |
| this.eventTypeClass = eventTypeClass; |
| this.listeners = new EnumMap<T,Set<L>>( this.eventTypeClass ); |
| |
| for( T t : this.eventTypeClass.getEnumConstants() ) |
| { |
| this.listeners.put( t, new CopyOnWriteArraySet<L>() ); |
| } |
| } |
| |
| public void addListener( final L listener, |
| final T... types ) |
| { |
| if( listener == null || types == null ) |
| { |
| throw new IllegalArgumentException(); |
| } |
| |
| for( T type : ( types.length > 0 ? types : this.eventTypeClass.getEnumConstants() ) ) |
| { |
| this.listeners.get( type ).add( listener ); |
| } |
| } |
| |
| public void removeListener( final L listener ) |
| { |
| if( listener == null ) |
| { |
| throw new IllegalArgumentException(); |
| } |
| |
| for( Set<L> listeners : this.listeners.values() ) |
| { |
| listeners.remove( listener ); |
| } |
| } |
| |
| public void notifyListeners( final T eventType, |
| final E event ) |
| { |
| for( L listener : this.listeners.get( eventType ) ) |
| { |
| try |
| { |
| notifyListener( listener, event ); |
| } |
| catch( Exception e ) |
| { |
| FacetCorePlugin.log( e ); |
| } |
| } |
| } |
| |
| protected abstract void notifyListener( final L listener, |
| final E event ); |
| |
| } |