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/*******************************************************************************
* 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();
}
}
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