| /******************************************************************************* |
| * Copyright (c) 2007 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.io.Serializable; |
| |
| import org.eclipse.jpt.utility.internal.model.event.CollectionChangeEvent; |
| import org.eclipse.jpt.utility.internal.model.event.ListChangeEvent; |
| import org.eclipse.jpt.utility.internal.model.event.PropertyChangeEvent; |
| import org.eclipse.jpt.utility.internal.model.event.StateChangeEvent; |
| import org.eclipse.jpt.utility.internal.model.event.TreeChangeEvent; |
| import org.eclipse.jpt.utility.internal.model.listener.CollectionChangeListener; |
| import org.eclipse.jpt.utility.internal.model.listener.ListChangeListener; |
| import org.eclipse.jpt.utility.internal.model.listener.PropertyChangeListener; |
| import org.eclipse.jpt.utility.internal.model.listener.StateChangeListener; |
| import org.eclipse.jpt.utility.internal.model.listener.TreeChangeListener; |
| |
| /** |
| * Null implementation of ChangeEventDispatcher interface: Do nothing. |
| */ |
| public class NullChangeEventDispatcher |
| implements ChangeEventDispatcher, Serializable |
| { |
| // singleton |
| private static ChangeEventDispatcher INSTANCE; |
| |
| private static final long serialVersionUID = 1L; |
| |
| |
| /** |
| * Return the singleton. |
| */ |
| public synchronized static ChangeEventDispatcher instance() { |
| if (INSTANCE == null) { |
| INSTANCE = new NullChangeEventDispatcher(); |
| } |
| return INSTANCE; |
| } |
| |
| /** |
| * Ensure non-instantiability. |
| */ |
| private NullChangeEventDispatcher() { |
| super(); |
| } |
| |
| public void stateChanged(StateChangeListener listener, StateChangeEvent event) { |
| // do nothing |
| } |
| |
| public void propertyChanged(PropertyChangeListener listener, PropertyChangeEvent event) { |
| // do nothing |
| } |
| |
| public void itemsAdded(CollectionChangeListener listener, CollectionChangeEvent event) { |
| // do nothing |
| } |
| |
| public void itemsRemoved(CollectionChangeListener listener, CollectionChangeEvent event) { |
| // do nothing |
| } |
| |
| public void collectionCleared(CollectionChangeListener listener, CollectionChangeEvent event) { |
| // do nothing |
| } |
| |
| public void collectionChanged(CollectionChangeListener listener, CollectionChangeEvent event) { |
| // do nothing |
| } |
| |
| public void itemsAdded(ListChangeListener listener, ListChangeEvent event) { |
| // do nothing |
| } |
| |
| public void itemsRemoved(ListChangeListener listener, ListChangeEvent event) { |
| // do nothing |
| } |
| |
| public void itemsReplaced(ListChangeListener listener, ListChangeEvent event) { |
| // do nothing |
| } |
| |
| public void itemsMoved(ListChangeListener listener, ListChangeEvent event) { |
| // do nothing |
| } |
| |
| public void listCleared(ListChangeListener listener, ListChangeEvent event) { |
| // do nothing |
| } |
| |
| public void listChanged(ListChangeListener listener, ListChangeEvent event) { |
| // do nothing |
| } |
| |
| public void nodeAdded(TreeChangeListener listener, TreeChangeEvent event) { |
| // do nothing |
| } |
| |
| public void nodeRemoved(TreeChangeListener listener, TreeChangeEvent event) { |
| // do nothing |
| } |
| |
| public void treeCleared(TreeChangeListener listener, TreeChangeEvent event) { |
| // do nothing |
| } |
| |
| public void treeChanged(TreeChangeListener listener, TreeChangeEvent event) { |
| // do nothing |
| } |
| |
| /** |
| * Serializable singleton support |
| */ |
| private Object readResolve() { |
| return instance(); |
| } |
| |
| } |