001    /* EventListenerProxy.java -- abstract wrapper for event listeners
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.util;
040    
041    /**
042     * An abstract wrapper for event listeners.  This allows subclasses to
043     * attach additional parameters to an existing event listener to create
044     * a new one.  Subclasses are expected to add methods to set and retrieve
045     * any attached properties.
046     *
047     * @author Eric Blake (ebb9@email.byu.edu)
048     * @since 1.4
049     * @status updated to 1.4
050     */
051    public abstract class EventListenerProxy implements EventListener
052    {
053      /** The listener that this proxy wraps. */
054      private final EventListener listener;
055    
056      /**
057       * Construct a proxy event listener, given an existing one to augment.
058       *
059       * @param listener the listener to wrap
060       */
061      public EventListenerProxy(EventListener listener)
062      {
063        this.listener = listener;
064      }
065    
066      /**
067       * Return the wrapped event listener.
068       *
069       * @return the listener associated with this proxy
070       */
071      public EventListener getListener()
072      {
073        return listener;
074      }
075    } // class EventListenerProxy