001// Copyright 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.engine.state; 016 017import org.apache.hivemind.util.Defense; 018 019/** 020 * @author Howard M. Lewis Ship 021 * @since 4.0 022 */ 023public class StateObjectManagerImpl implements StateObjectManager 024{ 025 private StateObjectPersistenceManager _persistenceManager; 026 027 private StateObjectFactory _factory; 028 029 private String _name; 030 031 public StateObjectManagerImpl(String name, StateObjectFactory factory, 032 StateObjectPersistenceManager persistenceManager) 033 { 034 Defense.notNull(name, "name"); 035 Defense.notNull(factory, "factory"); 036 Defense.notNull(persistenceManager, "persistenceManager"); 037 038 _name = name; 039 _factory = factory; 040 _persistenceManager = persistenceManager; 041 } 042 043 public boolean exists() 044 { 045 return _persistenceManager.exists(_name); 046 } 047 048 public Object get() 049 { 050 return _persistenceManager.get(_name, _factory); 051 } 052 053 public void store(Object stateObject) 054 { 055 _persistenceManager.store(_name, stateObject); 056 } 057}