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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * This code is free software; you can redistribute it and/or modify it
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 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
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package javax.swing.event;

import java.beans.PropertyChangeSupport;
import java.beans.PropertyChangeEvent;

import javax.swing.SwingUtilities;

This subclass of java.beans.PropertyChangeSupport is almost identical in functionality. The only difference is if constructed with SwingPropertyChangeSupport(sourceBean, true) it ensures listeners are only ever notified on the Event Dispatch Thread.
Author:
Igor Kushnirskiy/**
 * This subclass of {@code java.beans.PropertyChangeSupport} is almost
 * identical in functionality. The only difference is if constructed with
 * {@code SwingPropertyChangeSupport(sourceBean, true)} it ensures
 * listeners are only ever notified on the <i>Event Dispatch Thread</i>.
 *
 * @author Igor Kushnirskiy
 */

public final class SwingPropertyChangeSupport extends PropertyChangeSupport {

    
Constructs a SwingPropertyChangeSupport object.
Params:
sourceBean –  The bean to be given as the source for any
       events.
Throws:
NullPointerException – if sourceBean is null/**
     * Constructs a SwingPropertyChangeSupport object.
     *
     * @param sourceBean  The bean to be given as the source for any
     *        events.
     * @throws NullPointerException if {@code sourceBean} is
     *         {@code null}
     */
    public SwingPropertyChangeSupport(Object sourceBean) {
        this(sourceBean, false);
    }

    
Constructs a SwingPropertyChangeSupport object.
Params:
sourceBean – the bean to be given as the source for any events
notifyOnEDT – whether to notify listeners on the Event
       Dispatch Thread only
Throws:
NullPointerException – if sourceBean is null
Since:
1.6/**
     * Constructs a SwingPropertyChangeSupport object.
     *
     * @param sourceBean the bean to be given as the source for any events
     * @param notifyOnEDT whether to notify listeners on the <i>Event
     *        Dispatch Thread</i> only
     *
     * @throws NullPointerException if {@code sourceBean} is
     *         {@code null}
     * @since 1.6
     */
    public SwingPropertyChangeSupport(Object sourceBean, boolean notifyOnEDT) {
        super(sourceBean);
        this.notifyOnEDT = notifyOnEDT;
    }

    
{@inheritDoc}
 If isNotifyOnEDT is true and called off the Event Dispatch Thread this implementation uses SwingUtilities.invokeLater to send out the notification on the Event Dispatch Thread. This ensures  listeners
are only ever notified on the Event Dispatch Thread.
Throws:
NullPointerException – if evt is null
Since:
1.6/**
     * {@inheritDoc}
     *
     * <p>
     * If {@link #isNotifyOnEDT} is {@code true} and called off the
     * <i>Event Dispatch Thread</i> this implementation uses
     * {@code SwingUtilities.invokeLater} to send out the notification
     * on the <i>Event Dispatch Thread</i>. This ensures  listeners
     * are only ever notified on the <i>Event Dispatch Thread</i>.
     *
     * @throws NullPointerException if {@code evt} is
     *         {@code null}
     * @since 1.6
     */
    public void firePropertyChange(final PropertyChangeEvent evt) {
        if (evt == null) {
            throw new NullPointerException();
        }
        if (! isNotifyOnEDT()
            || SwingUtilities.isEventDispatchThread()) {
            super.firePropertyChange(evt);
        } else {
            SwingUtilities.invokeLater(
                new Runnable() {
                    public void run() {
                        firePropertyChange(evt);
                    }
                });
        }
    }

    
Returns notifyOnEDT property. 
See Also:
SwingPropertyChangeSupport(Object sourceBean, boolean notifyOnEDT)
Returns:
notifyOnEDT property
Since:
1.6/**
     * Returns {@code notifyOnEDT} property.
     *
     * @return {@code notifyOnEDT} property
     * @see #SwingPropertyChangeSupport(Object sourceBean, boolean notifyOnEDT)
     * @since 1.6
     */
    public final boolean isNotifyOnEDT() {
        return notifyOnEDT;
    }

    // Serialization version ID
    static final long serialVersionUID = 7162625831330845068L;

    
whether to notify listeners on EDT
@serial
Since:
1.6/**
     * whether to notify listeners on EDT
     *
     * @serial
     * @since 1.6
     */
    private final boolean notifyOnEDT;
}