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.simple;
016    
017    import java.io.Serializable;
018    
019    import org.apache.tapestry.contrib.table.model.ITableColumnModel;
020    import org.apache.tapestry.contrib.table.model.ITableDataModel;
021    import org.apache.tapestry.contrib.table.model.ITableModel;
022    import org.apache.tapestry.contrib.table.model.ITableSessionStateManager;
023    
024    /**
025     * A {@link org.apache.tapestry.contrib.table.model.ITableSessionStateManager} 
026     * implementation that saves only the paging and sorting state of the table model 
027     * into the session.
028     * 
029     * @author mindbridge
030     */
031    public class SimpleTableSessionStateManager
032            implements ITableSessionStateManager
033    {
034            private ITableDataModel m_objDataModel;
035            private ITableColumnModel m_objColumnModel;
036    
037            public SimpleTableSessionStateManager(
038                    ITableDataModel objDataModel,
039                    ITableColumnModel objColumnModel)
040            {
041                    m_objDataModel = objDataModel;
042                    m_objColumnModel = objColumnModel;
043            }
044    
045            /**
046             * @see org.apache.tapestry.contrib.table.model.ITableSessionStateManager#getSessionState(ITableModel)
047             */
048            public Serializable getSessionState(ITableModel objModel)
049            {
050                    SimpleTableModel objSimpleModel = (SimpleTableModel) objModel;
051                    return objSimpleModel.getState();
052            }
053    
054            /**
055             * @see org.apache.tapestry.contrib.table.model.ITableSessionStateManager#recreateTableModel(Serializable)
056             */
057            public ITableModel recreateTableModel(Serializable objState)
058            {
059                    if (objState == null)
060                            return null;
061                    SimpleTableState objSimpleState = (SimpleTableState) objState;
062                    return new SimpleTableModel(
063                            m_objDataModel,
064                            m_objColumnModel,
065                            objSimpleState);
066            }
067    
068    }