| /******************************************************************************* |
| * 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.ClassTools; |
| 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 that never notifies any listeners of any changes |
| * because it never changes. |
| */ |
| public class NullModel |
| implements Model, Cloneable, Serializable |
| { |
| private static final long serialVersionUID = 1L; |
| |
| |
| /** |
| * Default constructor. |
| */ |
| public NullModel() { |
| super(); |
| } |
| |
| |
| // ********** Model implementation ********** |
| |
| public void addStateChangeListener(StateChangeListener listener) { |
| // ignore listeners - nothing ever changes |
| } |
| |
| public void removeStateChangeListener(StateChangeListener listener) { |
| // ignore listeners - nothing ever changes |
| } |
| |
| public void addPropertyChangeListener(PropertyChangeListener listener) { |
| // ignore listeners - nothing ever changes |
| } |
| |
| public void addPropertyChangeListener(String propertyName, PropertyChangeListener listener) { |
| // ignore listeners - nothing ever changes |
| } |
| |
| public void removePropertyChangeListener(PropertyChangeListener listener) { |
| // ignore listeners - nothing ever changes |
| } |
| |
| public void removePropertyChangeListener(String propertyName, PropertyChangeListener listener) { |
| // ignore listeners - nothing ever changes |
| } |
| |
| public void addCollectionChangeListener(CollectionChangeListener listener) { |
| // ignore listeners - nothing ever changes |
| } |
| |
| public void addCollectionChangeListener(String collectionName, CollectionChangeListener listener) { |
| // ignore listeners - nothing ever changes |
| } |
| |
| public void removeCollectionChangeListener(CollectionChangeListener listener) { |
| // ignore listeners - nothing ever changes |
| } |
| |
| public void removeCollectionChangeListener(String collectionName, CollectionChangeListener listener) { |
| // ignore listeners - nothing ever changes |
| } |
| |
| public void addListChangeListener(ListChangeListener listener) { |
| // ignore listeners - nothing ever changes |
| } |
| |
| public void addListChangeListener(String listName, ListChangeListener listener) { |
| // ignore listeners - nothing ever changes |
| } |
| |
| public void removeListChangeListener(ListChangeListener listener) { |
| // ignore listeners - nothing ever changes |
| } |
| |
| public void removeListChangeListener(String listName, ListChangeListener listener) { |
| // ignore listeners - nothing ever changes |
| } |
| |
| public void addTreeChangeListener(TreeChangeListener listener) { |
| // ignore listeners - nothing ever changes |
| } |
| |
| public void addTreeChangeListener(String treeName, TreeChangeListener listener) { |
| // ignore listeners - nothing ever changes |
| } |
| |
| public void removeTreeChangeListener(TreeChangeListener listener) { |
| // ignore listeners - nothing ever changes |
| } |
| |
| public void removeTreeChangeListener(String treeName, TreeChangeListener listener) { |
| // ignore listeners - nothing ever changes |
| } |
| |
| |
| // ********** Object overrides ********** |
| |
| @Override |
| public synchronized NullModel clone() { |
| try { |
| return (NullModel) super.clone(); |
| } catch (CloneNotSupportedException ex) { |
| throw new InternalError(); |
| } |
| } |
| |
| @Override |
| public String toString() { |
| return ClassTools.shortClassNameForObject(this); |
| } |
| |
| } |