001/* AWTEventListenerProxy.java -- wrapper/filter for AWTEventListener 002 Copyright (C) 2002, 2005 Free Software Foundation, Inc. 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038 039package java.awt.event; 040 041import java.awt.AWTEvent; 042import java.awt.Toolkit; 043import 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 */ 055public 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