/*
* 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
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*/
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;
}