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 1.0.1
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