/*******************************************************************************
* Copyright (c) 2009 Matthew Hall and others.
* 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:
* Matthew Hall - initial API and implementation (bug 265561)
* Matthew Hall - bug 268336
******************************************************************************/
package org.eclipse.core.internal.databinding.beans;
import java.beans.PropertyChangeListener;
import java.beans.PropertyDescriptor;
import org.eclipse.core.databinding.observable.IDiff;
import org.eclipse.core.databinding.property.IProperty;
import org.eclipse.core.databinding.property.ISimplePropertyListener;
import org.eclipse.core.databinding.property.NativePropertyListener;
/**
* @since 3.3
*
*/
public abstract class BeanPropertyListener extends NativePropertyListener
implements PropertyChangeListener {
private final PropertyDescriptor propertyDescriptor;
protected BeanPropertyListener(IProperty property,
PropertyDescriptor propertyDescriptor,
ISimplePropertyListener listener) {
super(property, listener);
this.propertyDescriptor = propertyDescriptor;
}
public void propertyChange(java.beans.PropertyChangeEvent evt) {
if (evt.getPropertyName() == null
|| propertyDescriptor.getName().equals(evt.getPropertyName())) {
Object oldValue = evt.getOldValue();
Object newValue = evt.getNewValue();
IDiff diff;
if (evt.getPropertyName() == null || oldValue == null
|| newValue == null)
diff = null;
else
diff = computeDiff(oldValue, newValue);
fireChange(evt.getSource(), diff);
}
}
protected abstract IDiff computeDiff(Object oldValue, Object newValue);
protected void doAddTo(Object source) {
BeanPropertyListenerSupport.hookListener(source, propertyDescriptor
.getName(), this);
}
protected void doRemoveFrom(Object source) {
BeanPropertyListenerSupport.unhookListener(source, propertyDescriptor
.getName(), this);
}
}