/* * Copyright (c) 1998, 2006, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * 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. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package javax.swing.event; import java.beans.PropertyChangeSupport;import java.beans.PropertyChangeEvent; import javax.swing.SwingUtilities; /** * 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.     *     * @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.     *     * @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}     *     * <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 {@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     */    private final boolean notifyOnEDT;}