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 015package org.apache.tapestry.contrib.table.components; 016 017import java.io.Serializable; 018 019import org.apache.tapestry.contrib.table.model.ITableModel; 020import org.apache.tapestry.contrib.table.model.ITableSessionStateManager; 021import org.apache.tapestry.contrib.table.model.simple.SimpleTableState; 022 023/** 024 * Acts like {@link org.apache.tapestry.contrib.table.model.common.FullTableSessionStateManager} 025 * if the model is provided via the tableModel parameter; 026 * saves only the model state otherwise. 027 * 028 * @author mindbridge 029 */ 030public class TableViewSessionStateManager implements ITableSessionStateManager 031{ 032 private TableView m_objView; 033 034 public TableViewSessionStateManager(TableView objView) 035 { 036 m_objView = objView; 037 } 038 039 /** 040 * @see org.apache.tapestry.contrib.table.model.ITableSessionStateManager#getSessionState(org.apache.tapestry.contrib.table.model.ITableModel) 041 */ 042 public Serializable getSessionState(ITableModel objModel) 043 { 044 // if the model is provided using the 'tableModel' parameter, 045 // emulate FullTableSessionStateManager and save everything 046 // (backward compatibility) 047 if (m_objView.getCachedTableModelValue() != null) 048 return (Serializable) objModel; 049 050 // otherwise save only the state 051 return new SimpleTableState(objModel.getPagingState(), objModel.getSortingState()); 052 } 053 054 /** 055 * @see org.apache.tapestry.contrib.table.model.ITableSessionStateManager#recreateTableModel(java.io.Serializable) 056 */ 057 public ITableModel recreateTableModel(Serializable objState) 058 { 059 // if the state implements ITableModel, return itself 060 // (backward compatibility) 061 if (objState instanceof ITableModel) 062 return (ITableModel) objState; 063 064 // otherwise have the component re-generate the model using the provided state 065 return m_objView.generateTableModel((SimpleTableState) objState); 066 } 067 068}