001    /*
002     * Copyright 2005 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.transit.model;
020    
021    import java.util.EventObject;
022    
023    /**
024     * An event issued by a layout registry signalling addition or removal
025     * of a layout model.
026     *
027     * @author <a href="http://www.dpml.net">The Digital Product Meta Library</a>
028     * @version 1.0.0
029     */
030    public abstract class LayoutRegistryEvent extends EventObject
031    {
032       /**
033        * Serial version identifier.
034        */
035        static final long serialVersionUID = 1L;
036    
037        private final LayoutModel m_resolver;
038        private final LayoutRegistryModel m_system;
039    
040       /**
041        * Creation of a new LayoutRegistryEvent signalling the addition
042        * or removal of a layout model.
043        * 
044        * @param system the layout model
045        * @param resolver the layout resolver model that was added or removed
046        */   
047        public LayoutRegistryEvent( LayoutRegistryModel system, LayoutModel resolver )
048        {
049            super( system );
050            m_system = system;
051            m_resolver = resolver;
052        }
053        
054       /**
055        * Return the model initiating the event.
056        * @return the layout model
057        */
058        public LayoutRegistryModel getLayoutRegistryModel()
059        {
060            return m_system;
061        }
062    
063       /**
064        * Return the resolver model that was added or removed.
065        * @return the resolver model
066        */
067        public LayoutModel getLayoutModel()
068        {
069            return m_resolver;
070        }
071    }
072