001 /* java.beans.beancontext.BeanContextEvent 002 Copyright (C) 1999 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.beans.beancontext; 040 041 import java.util.EventObject; 042 043 /** 044 * Generic superclass for events fired by <code>BeanContext</code>s. 045 * 046 * @author John Keiser 047 * @since 1.2 048 */ 049 050 public abstract class BeanContextEvent extends EventObject 051 { 052 private static final long serialVersionUID = 7267998073569045052L; 053 054 /** 055 * The <code>BeanContext</code> that most recently passed this 056 * event on. 057 */ 058 protected BeanContext propagatedFrom; 059 060 /** 061 * Create a new event, from the specified <code>BeanContext</code>. 062 * <code>propagatedFrom</code> will be initialized to 063 * <code>null</code>. 064 * 065 * @param source the source of the event. 066 */ 067 protected BeanContextEvent(BeanContext source) 068 { 069 super(source); 070 } 071 072 /** 073 * Get the <code>BeanContext</code> that originated this event. 074 * @return the originator of this event. 075 */ 076 public BeanContext getBeanContext() 077 { 078 return (BeanContext)getSource(); 079 } 080 081 /** 082 * Get the most recent propagator of this event. 083 * If this value is <code>null</code>, you have received the event 084 * straight from the source. 085 * 086 * @return the most recent propagator of this event. 087 */ 088 public BeanContext getPropagatedFrom() 089 { 090 return propagatedFrom; 091 } 092 093 /** 094 * Tell whether this event has been propagated. 095 * @return <code>true</code> iff <code>getPropagatedFrom() != null</code>. 096 */ 097 public boolean isPropagated() 098 { 099 return propagatedFrom != null; 100 } 101 102 /** 103 * Set the most recent propagator of this event. 104 * @param propagator the most recent propagator of this event. 105 */ 106 public void setPropagatedFrom(BeanContext propagator) 107 { 108 propagatedFrom = propagator; 109 } 110 }