001 /**
002 * GRANITE DATA SERVICES
003 * Copyright (C) 2006-2013 GRANITE DATA SERVICES S.A.S.
004 *
005 * This file is part of the Granite Data Services Platform.
006 *
007 * Granite Data Services is free software; you can redistribute it and/or
008 * modify it under the terms of the GNU Lesser General Public
009 * License as published by the Free Software Foundation; either
010 * version 2.1 of the License, or (at your option) any later version.
011 *
012 * Granite Data Services is distributed in the hope that it will be useful,
013 * but WITHOUT ANY WARRANTY; without even the implied warranty of
014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
015 * General Public License for more details.
016 *
017 * You should have received a copy of the GNU Lesser General Public
018 * License along with this library; if not, write to the Free Software
019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
020 * USA, or see <http://www.gnu.org/licenses/>.
021 */
022 package org.granite.tide.seam.lazy;
023
024 import java.io.Serializable;
025
026 import javax.persistence.EntityManager;
027 import javax.persistence.Query;
028
029 import org.granite.context.GraniteContext;
030 import org.granite.messaging.amf.io.util.ClassGetter;
031 import org.granite.tide.TidePersistenceManager;
032 import org.jboss.seam.Entity;
033 import org.jboss.seam.util.Reflections;
034
035 /**
036 * Manager responsible for the maintaining a refernce for the PersistenceContext(JPA).
037 * @author CIngram
038 */
039 public class PersistenceContextManager implements TidePersistenceManager {
040
041 private EntityManager em;
042
043 public PersistenceContextManager() {
044 }
045
046 public PersistenceContextManager(EntityManager em) {
047 this.em = em;
048 }
049
050 /**
051 * Attach the passed in entity with the EntityManager.
052 * @param entity
053 * @return the attached entity object
054 */
055 public Object attachEntity(Object entity, String[] propertyNames) {
056 Object attachedEntity = null;
057 ClassGetter getter = GraniteContext.getCurrentInstance().getGraniteConfig().getClassGetter();
058
059 //the get is called to give the children a chance to override and
060 //use the implemented method
061 attachedEntity = fetchEntity(entity, propertyNames);
062
063 if (attachedEntity != null && propertyNames != null) {
064 for (int i = 0; i < propertyNames.length; i++) {
065 try {
066 Object initializedObj = Reflections.getGetterMethod(attachedEntity.getClass(), propertyNames[i]).invoke(attachedEntity);
067
068 //This is here to make sure the list is forced to return a value while operating inside of a
069 //session. Forcing the initialization of object.
070 if (getter != null)
071 getter.initialize(entity, propertyNames[i], initializedObj);
072 }
073 catch (Exception e) {
074 throw new RuntimeException("Could not initialize entity " + attachedEntity, e);
075 }
076 }
077 }
078
079 return attachedEntity;
080 }
081
082 /**
083 * attaches the entity to the JPA context.
084 * @return the attached entity
085 */
086 public Object fetchEntity(Object entity, String[] fetch) {
087 Serializable id = (Serializable)Entity.forClass(entity.getClass()).getIdentifier(entity);
088 if (id == null)
089 return null;
090
091 if (fetch == null || em.getDelegate().getClass().getName().indexOf(".hibernate.") < 0)
092 return em.find(entity.getClass(), id);
093
094 for (String f : fetch) {
095 Query q = em.createQuery("select e from " + entity.getClass().getName() + " e left join fetch e." + f + " where e = :entity");
096 q.setParameter("entity", entity);
097 entity = q.getSingleResult();
098 }
099 return entity;
100 }
101 }