| /******************************************************************************* |
| * 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); |
| } |
| } |