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.jboss.seam.Component;
030    import org.jboss.seam.Entity;
031    import 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     */
039    public 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    }