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.hibernate;
023
024import java.io.Serializable;
025
026import org.granite.hibernate.HibernateOptimisticLockException;
027import org.granite.tide.data.TidePersistenceAdapter;
028import org.hibernate.Criteria;
029import org.hibernate.Session;
030import org.hibernate.SessionFactory;
031import org.hibernate.criterion.Restrictions;
032
033/**
034 * Implementation of Tide persistence adapter with a Hibernate Session
035 * @author William DRAI
036 *
037 */
038public class HibernatePersistenceAdapter implements TidePersistenceAdapter {
039        
040        private Session session;
041                
042        public HibernatePersistenceAdapter(SessionFactory sessionFactory) {
043                this.session = sessionFactory.getCurrentSession();
044        }
045        
046        public HibernatePersistenceAdapter(Session session) {
047                this.session = session;
048        }
049
050    /**
051     * Find an entity in the persistence context
052     * @param entityClass class of the looked up entity
053     * @param id entity identifier
054     * @return the entity with the persistence context.
055     */
056    public Object find(Class<?> entityClass, Serializable id) {
057        // Use Criteria instead of Session.load() to avoid getting proxies
058        Criteria criteria = session.createCriteria(entityClass);
059        criteria.add(Restrictions.idEq(id));
060        return criteria.uniqueResult();
061    }
062
063    /**
064     * Throw an optimistic locking error
065     * @param entity entity instance loaded from the database
066     */
067    public void throwOptimisticLockException(Object entity) {
068        throw new HibernateOptimisticLockException("Change detected on stale object", null, entity);
069    }
070}