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'databene commons' is an open source Java library by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.databene.commons.bean;

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.io.IOException;
import java.io.ObjectInputStream;

import org.databene.commons.NullSafeComparator;

/**
 * Default implementation for {@link ObservableBean}.
 * Created at 17.07.2008 14:47:55
 * @since 0.4.5
 * @author Volker Bergmann
 */
public class AbstractObservableBean implements ObservableBean {

	private static final long serialVersionUID = 8228948623675990966L;
	
	protected transient PropertyChangeSupport propertyChangeSupport = new PropertyChangeSupport(this);

	@Override
	public void addPropertyChangeListener(PropertyChangeListener listener) {
		propertyChangeSupport.addPropertyChangeListener(listener);
	}

	@Override
	public void addPropertyChangeListener(String propertyName, PropertyChangeListener listener) {
		propertyChangeSupport.addPropertyChangeListener(propertyName, listener);
	}

	@Override
	public void removePropertyChangeListener(PropertyChangeListener listener) {
		propertyChangeSupport.removePropertyChangeListener(listener);
	}

	@Override
	public void removePropertyChangeListener(String propertyName, PropertyChangeListener listener) {
		propertyChangeSupport.removePropertyChangeListener(propertyName, listener);
	}
	
	protected void firePropertyChange(Object source, String propertyName, Object oldValue, Object newValue) {
		if (!NullSafeComparator.equals(oldValue, newValue)) {
			PropertyChangeEvent event = new PropertyChangeEvent(source, propertyName, oldValue, newValue);
			propertyChangeSupport.firePropertyChange(event);
		}
	}

	private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
		in.defaultReadObject();
		this.propertyChangeSupport = new PropertyChangeSupport(this);
	}
	
}