001 /* 002 * Copyright 2006 Stephen J. McConnell. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * http://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 013 * implied. 014 * 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018 019 package net.dpml.component; 020 021 import java.util.EventObject; 022 023 /** 024 * Event triggered as a result of change to the value of a context entry. 025 * 026 * @author <a href="http://www.dpml.net">Digital Product Meta Library</a> 027 * @version 1.0.2 028 */ 029 public class StatusEvent extends EventObject 030 { 031 /** 032 * Serial version identifier. 033 */ 034 static final long serialVersionUID = 1L; 035 036 private final Status m_new; 037 private final Status m_old; 038 039 /** 040 * Construct a new <code>StatusEvent</code>. 041 * 042 * @param source the source provider 043 * @param oldStatus the initial provider status 044 * @param newStatus the new provider status 045 */ 046 public StatusEvent( final Provider source, Status oldStatus, Status newStatus ) 047 { 048 super( source ); 049 050 m_new = newStatus; 051 m_old = oldStatus; 052 } 053 054 /** 055 * Return the prior status value. 056 * @return the provider status prior to the status change 057 */ 058 public Status getOldStatus() 059 { 060 return m_old; 061 } 062 063 /** 064 * Return the status value. 065 * @return the provider status 066 */ 067 public Status getNewStatus() 068 { 069 return m_new; 070 } 071 072 /** 073 * Return the component model that initiating the event. 074 * @return the source model 075 */ 076 public Provider getProvider() 077 { 078 return (Provider) super.getSource(); 079 } 080 } 081