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 org.hibernate.Query;
027    import org.hibernate.Session;
028    import org.jboss.seam.Component;
029    import org.jboss.seam.Entity;
030    
031    /**
032     * Manager responsible for looking up the Hibernate Session for the
033     * passed in SessionManagerName
034     * @author CIngram
035     */
036    public class SeamHibernateManager extends HibernateContextManager  {
037            
038            private String sessionManagerName = null;
039            private Session session = null;
040    
041            public SeamHibernateManager(String sessionManagerName) {
042                    this.sessionManagerName = sessionManagerName;
043            }
044            
045    
046            /**
047             * Attach the passed in entity with the HibernateManager stored 
048             * in Seam.
049             * @param entity
050             * @return the attached hibernate object
051             */
052        @Override
053        public Object fetchEntity(Object entity, String[] fetch) {
054            Serializable id = (Serializable)Entity.forClass(entity.getClass()).getIdentifier(entity);
055            if (id == null)
056                return null;
057            
058            this.session = (Session)Component.getInstance(sessionManagerName);
059            
060            if (fetch == null)
061                    return session.get(entity.getClass(), id);
062            
063            for (String f : fetch) {
064                    Query q = session.createQuery("select e from " + entity.getClass().getName() + " e left join fetch e." + f + " where e = :entity");
065                    q.setParameter("entity", entity);
066                    entity = q.uniqueResult();
067            }
068            return entity;
069        }
070            
071            /**
072             * Disconnects from the current hibernate session.
073             */
074            @Override
075            protected void disconnectSession() {
076                    session.disconnect();
077            }
078    }