Source for java.awt.event.AWTEventListenerProxy

   1: /* AWTEventListenerProxy.java -- wrapper/filter for AWTEventListener
   2:    Copyright (C) 2002, 2005  Free Software Foundation, Inc.
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: 
  39: package java.awt.event;
  40: 
  41: import java.awt.AWTEvent;
  42: import java.awt.Toolkit;
  43: import java.util.EventListenerProxy;
  44: 
  45: /**
  46:  * This class allows adding an AWTEventListener which only pays attention to
  47:  * a specific event mask.
  48:  *
  49:  * @author Eric Blake (ebb9@email.byu.edu)
  50:  * @see Toolkit
  51:  * @see EventListenerProxy
  52:  * @since 1.4
  53:  * @status updated to 1.4
  54:  */
  55: public class AWTEventListenerProxy extends EventListenerProxy
  56:   implements AWTEventListener
  57: {
  58:   /** The event mask. */
  59:   private final long mask;
  60: 
  61:   /**
  62:    * Construct an AWT Event Listener which only listens to events in the given
  63:    * mask, passing the work on to the real listener.
  64:    *
  65:    * @param eventMask the mask of events to listen to
  66:    * @param listener the wrapped listener
  67:    */
  68:   public AWTEventListenerProxy(long eventMask, AWTEventListener listener)
  69:   {
  70:     super(listener);
  71:     mask = eventMask;
  72:   }
  73: 
  74:   /**
  75:    * Forwards events on to the delegate.
  76:    *
  77:    * @param event the to forward to the delagate listener
  78:    *
  79:    * @throws NullPointerException if the delegate this was created with is null
  80:    */
  81:   public void eventDispatched(AWTEvent event)
  82:   {
  83:     ((AWTEventListener) getListener()).eventDispatched(event);
  84:   }
  85: 
  86:   /**
  87:    * This returns the event mask associated with this listener.
  88:    *
  89:    * @return the event mask
  90:    */
  91:   public long getEventMask()
  92:   {
  93:     return mask;
  94:   }
  95: } // class AWTEventListenerProxy