| /******************************************************************************* |
| * Copyright (c) 2008, 2009 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: |
| * Oracle - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.jpt.utility.internal.model; |
| |
| import java.util.EventListener; |
| |
| import org.eclipse.jpt.utility.internal.ListenerList; |
| import org.eclipse.jpt.utility.model.Model; |
| |
| /** |
| * This change support class will notify listeners whenever one of the source's |
| * aspects has changed. Only the aspect name is passed to the listener; no |
| * event is generated. This allows the listeners to delegate to the change |
| * support object verification that an aspect as actually changed. This is |
| * useful for simple things like setting dirty flags, blanket validation, and |
| * blanket sychronization; i.e. things that might be interested in the *name* |
| * of the aspect that changed but not so much *how* the aspect changed. |
| */ |
| public class CallbackChangeSupport |
| extends ChangeSupport |
| { |
| protected final ListenerList<Listener> listenerList; |
| private static final long serialVersionUID = 1L; |
| |
| |
| public CallbackChangeSupport(Model source, Listener listener) { |
| this(source); |
| this.listenerList.add(listener); |
| } |
| |
| public CallbackChangeSupport(Model source) { |
| super(source); |
| this.listenerList = new ListenerList<Listener>(Listener.class); |
| } |
| |
| @Override |
| protected void aspectChanged(String aspectName) { |
| super.aspectChanged(aspectName); |
| for (Listener listener : this.listenerList.getListeners()) { |
| listener.aspectChanged(aspectName); |
| } |
| } |
| |
| public void addListener(Listener listener) { |
| this.listenerList.add(listener); |
| } |
| |
| public void removeListener(Listener listener) { |
| this.listenerList.remove(listener); |
| } |
| |
| |
| // ********** listener interface ********** |
| |
| /** |
| * Listener that will be notified of any aspect changes. |
| */ |
| public interface Listener extends EventListener { |
| |
| /** |
| * The specified aspect changed. |
| */ |
| void aspectChanged(String aspectName); |
| |
| } |
| |
| } |