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 */
022package org.granite.tide.seam.lazy;
023
024import java.io.Serializable;
025
026import javax.persistence.EntityManager;
027import javax.persistence.Query;
028
029import org.jboss.seam.Component;
030import org.jboss.seam.Entity;
031import org.jboss.seam.framework.PersistenceController;
032
033
034/**
035 * Manager responsible for looking up the EntityHome from the Seam context.
036 * @author cingram
037 *
038 */
039public class PersistenceControllerManager extends PersistenceContextManager {
040    
041    private String controllerName;  
042
043    public PersistenceControllerManager(String controllerName) {
044        this.controllerName = controllerName;
045    }
046    
047    /**
048     * Attach the passed in entity with the EntityManager stored 
049     * in the EntityHome object.
050     * @param entity
051     * @return the attached hibernate object
052     */
053    @Override
054    public Object fetchEntity(Object entity, String[] fetch) {
055        PersistenceController<?> controller = (PersistenceController<?>)Component.getInstance(controllerName);
056        EntityManager em = (EntityManager)controller.getPersistenceContext();
057        Serializable id = (Serializable)Entity.forClass(entity.getClass()).getIdentifier(entity);
058        if (id == null)
059            return null;
060        
061        if (fetch == null || em.getDelegate().getClass().getName().indexOf(".hibernate.") < 0)
062                return em.find(entity.getClass(), id);
063        
064        for (String f : fetch) {
065                Query q = em.createQuery("select e from " + entity.getClass().getName() + " e left join fetch e." + f + " where e = :entity");
066                q.setParameter("entity", entity);
067                entity = q.getSingleResult();
068        }
069        return entity;
070    }
071
072}