001// Copyright 2008 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.tapestry5.internal.hibernate; 016 017import org.apache.tapestry5.internal.services.AbstractSessionPersistentFieldStrategy; 018import org.apache.tapestry5.services.Request; 019import org.hibernate.HibernateException; 020import org.hibernate.Session; 021 022import java.io.Serializable; 023 024/** 025 * Persists Hibernate entities by storing their id in the session. 026 * 027 * @see org.apache.tapestry5.internal.hibernate.PersistedEntity 028 */ 029public class EntityPersistentFieldStrategy extends AbstractSessionPersistentFieldStrategy 030{ 031 private final Session session; 032 033 public EntityPersistentFieldStrategy(Session session, Request request) 034 { 035 super("entity:", request); 036 037 this.session = session; 038 } 039 040 @Override 041 protected Object convertApplicationValueToPersisted(Object newValue) 042 { 043 try 044 { 045 String entityName = session.getEntityName(newValue); 046 Serializable id = session.getIdentifier(newValue); 047 048 return new PersistedEntity(entityName, id); 049 } 050 catch (HibernateException ex) 051 { 052 throw new IllegalArgumentException(HibernateMessages.entityNotAttached(newValue), ex); 053 } 054 } 055 056 @Override 057 protected Object convertPersistedToApplicationValue(Object persistedValue) 058 { 059 PersistedEntity persisted = (PersistedEntity) persistedValue; 060 061 return persisted.restore(session); 062 } 063}