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/*******************************************************************************
* 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:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.utility.internal.model;
import org.eclipse.jpt.utility.model.Model;
/**
* This change support class will notify the source when one of the source's
* aspects has changed.
*/
public class CallbackChangeSupport extends ChangeSupport {
private static final long serialVersionUID = 1L;
public CallbackChangeSupport(Source source) {
super(source);
}
protected Source source() {
return (Source) this.source;
}
@Override
protected ChangeSupport buildChildChangeSupport() {
return new Child(this.source());
}
@Override
protected void sourceChanged(String aspectName) {
super.sourceChanged(aspectName);
this.source().aspectChanged(aspectName);
}
// ********** child chang support **********
/**
* The aspect-specific change support class does not need to
* notify the source node of changes (the parent will take care of that);
* nor does it need to build "grandchildren" change support objects.
*/
protected static class Child extends ChangeSupport {
private static final long serialVersionUID = 1L;
public Child(Source source) {
super(source);
}
protected Source source() {
return (Source) this.source;
}
@Override
protected ChangeSupport buildChildChangeSupport() {
// there are no grandchildren
throw new UnsupportedOperationException();
}
}
// ********** source interface **********
/**
* The callback change support source must implement this interface so it
* can be notified of any aspect changes.
*/
public interface Source extends Model {
/**
* The specified aspect changed.
*/
void aspectChanged(String aspectName);
}
}
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