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. 010 011 GNU Classpath is distributed in the hope that it will be useful, but 012 WITHOUT ANY WARRANTY; without even the implied warranty of 013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 General Public License for more details. 015 016 You should have received a copy of the GNU General Public License 017 along with GNU Classpath; see the file COPYING. If not, write to the 018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 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 030 terms of your choice, provided that you also meet, for each linked 031 independent module, the terms and conditions of the license of that 032 module. An independent module is a module which is not derived from 033 or based on this library. If you modify this library, you may extend 034 this exception to your version of the library, but you are not 035 obligated to do so. If you do not wish to do so, delete this 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