001    // Copyright 2004, 2005 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry.contrib.table.model.common;
016    
017    import java.io.Serializable;
018    
019    import org.apache.tapestry.contrib.table.model.ITableModel;
020    import org.apache.tapestry.contrib.table.model.ITableSessionStateManager;
021    
022    /**
023     * A simple ITableSessionStateManager implementation 
024     * that saves nothing at all into the session.
025     * 
026     * @author mindbridge
027     */
028    public class NullTableSessionStateManager implements ITableSessionStateManager
029    {
030        
031        public final static NullTableSessionStateManager NULL_STATE_MANAGER =
032            new NullTableSessionStateManager();
033    
034            /**
035             * @see org.apache.tapestry.contrib.table.model.ITableSessionStateManager#getSessionState(ITableModel)
036             */
037            public Serializable getSessionState(ITableModel objModel)
038            {
039                    return null;
040            }
041    
042            /**
043             * @see org.apache.tapestry.contrib.table.model.ITableSessionStateManager#recreateTableModel(Serializable)
044             */
045            public ITableModel recreateTableModel(Serializable objState)
046            {
047                    return null;
048            }
049    
050    }