/*
 * $Id: AbstractSerializableBean.java,v 1.1 2008/07/12 11:36:49 dbarashev Exp $
 *
 * Copyright 2008 Sun Microsystems, Inc., 4150 Network Circle,
 * Santa Clara, California 95054, U.S.A. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
package org.jdesktop.beans;

import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
import java.beans.VetoableChangeListener;
import java.beans.VetoableChangeSupport;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

/**
 * This subclass enhances {@code AbstractBean} by implementing the
 * {@code Serializable} interface. {@code AbstractSerializableBean} correctly
 * serializes all {@code Serializable} listeners that it contains. Implementors
 * that need to extends {@code AbstractBean} or one of its subclasses and
 * require serialization should use this class if possible. If it is not
 * possible to extend this class, the implementation can guide implementors on
 * how to properly serialize the listeners.
 * 
 * @author Karl George Schaefer
 * 
 * @see Serializable
 * @see ObjectInputStream
 * @see ObjectOutputStream
 */
public abstract class AbstractSerializableBean extends AbstractBean implements
		Serializable {
	/**
	 * Creates a new instance of {@code AbstractSerializableBean}.
	 */
	protected AbstractSerializableBean() {
		super();
	}

	/**
	 * Creates a new instance of {@code AbstractSerializableBean}, using the
	 * supplied support delegates. Neither of these may be {@code null}.
	 * 
	 * @param pcs
	 *            the property change support class to use
	 * @param vcs
	 *            the vetoable change support class to use
	 * @throws NullPointerException
	 *             if any parameter is {@code null}
	 */
	protected AbstractSerializableBean(PropertyChangeSupport pcs,
			VetoableChangeSupport vcs) {
		super(pcs, vcs);
	}

	private void writeObject(ObjectOutputStream s) throws IOException {
		s.defaultWriteObject();

		for (PropertyChangeListener l : getPropertyChangeListeners()) {
			if (l instanceof Serializable) {
				s.writeObject(l);
			}
		}

		for (VetoableChangeListener l : getVetoableChangeListeners()) {
			if (l instanceof Serializable) {
				s.writeObject(l);
			}
		}

		s.writeObject(null);
	}

	private void readObject(ObjectInputStream s) throws ClassNotFoundException,
			IOException {
		s.defaultReadObject();

		Object listenerOrNull;
		while (null != (listenerOrNull = s.readObject())) {
			if (listenerOrNull instanceof PropertyChangeListener) {
				addPropertyChangeListener((PropertyChangeListener) listenerOrNull);
			} else if (listenerOrNull instanceof VetoableChangeListener) {
				addVetoableChangeListener((VetoableChangeListener) listenerOrNull);
			}
		}
	}
}
