libjava/java/util/EventListenerProxy.java

   1 /* EventListenerProxy.java -- abstract wrapper for event listeners
   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., 59 Temple Place, Suite 330, Boston, MA
  19 02111-1307 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.util;
  40
  41 /**
  42  * An abstract wrapper for event listeners.  This allows subclasses to
  43  * attach additional parameters to an existing event listener to create
  44  * a new one.  Subclasses are expected to add methods to set and retrieve
  45  * any attached properties.
  46  *
  47  * @author Eric Blake (ebb9@email.byu.edu)
  48  * @since 1.4
  49  * @status updated to 1.4
  50  */
  51 public abstract class EventListenerProxy implements EventListener
  52 {
  53   /** The listener that this proxy wraps. */
  54   private final EventListener listener;
  55
  56   /**
  57    * Construct a proxy event listener, given an existing one to augment.
  58    *
  59    * @param listener the listener to wrap
  60    */
  61   public EventListenerProxy(EventListener listener)
  62   {
  63     this.listener = listener;
  64   }
  65
  66   /**
  67    * Return the wrapped event listener.
  68    *
  69    * @return the listener associated with this proxy
  70    */
  71   public EventListener getListener()
  72   {
  73     return listener;
  74   }
  75 } // class EventListenerProxy