001 /* AWTEventListenerProxy.java -- wrapper/filter for AWTEventListener
002 Copyright (C) 2002, 2005 Free Software Foundation, Inc.
003
004 This file is part of GNU Classpath.
005
006 GNU Classpath is free software; you can redistribute it and/or modify
007 it under the terms of the GNU General Public License as published by
008 the Free Software Foundation; either version 2, or (at your option)
009 any later version.
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013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014 General Public License for more details.
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019 02110-1301 USA.
020
021 Linking this library statically or dynamically with other modules is
022 making a combined work based on this library. Thus, the terms and
023 conditions of the GNU General Public License cover the whole
024 combination.
025
026 As a special exception, the copyright holders of this library give you
027 permission to link this library with independent modules to produce an
028 executable, regardless of the license terms of these independent
029 modules, and to copy and distribute the resulting executable under
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031 independent module, the terms and conditions of the license of that
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036 exception statement from your version. */
037
038
039 package java.awt.event;
040
041 import java.awt.AWTEvent;
042 import java.awt.Toolkit;
043 import java.util.EventListenerProxy;
044
045 /**
046 * This class allows adding an AWTEventListener which only pays attention to
047 * a specific event mask.
048 *
049 * @author Eric Blake (ebb9@email.byu.edu)
050 * @see Toolkit
051 * @see EventListenerProxy
052 * @since 1.4
053 * @status updated to 1.4
054 */
055 public class AWTEventListenerProxy extends EventListenerProxy
056 implements AWTEventListener
057 {
058 /** The event mask. */
059 private final long mask;
060
061 /**
062 * Construct an AWT Event Listener which only listens to events in the given
063 * mask, passing the work on to the real listener.
064 *
065 * @param eventMask the mask of events to listen to
066 * @param listener the wrapped listener
067 */
068 public AWTEventListenerProxy(long eventMask, AWTEventListener listener)
069 {
070 super(listener);
071 mask = eventMask;
072 }
073
074 /**
075 * Forwards events on to the delegate.
076 *
077 * @param event the to forward to the delagate listener
078 *
079 * @throws NullPointerException if the delegate this was created with is null
080 */
081 public void eventDispatched(AWTEvent event)
082 {
083 ((AWTEventListener) getListener()).eventDispatched(event);
084 }
085
086 /**
087 * This returns the event mask associated with this listener.
088 *
089 * @return the event mask
090 */
091 public long getEventMask()
092 {
093 return mask;
094 }
095 } // class AWTEventListenerProxy