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.hibernate;
023    
024    import java.io.Serializable;
025    
026    import org.granite.hibernate.HibernateOptimisticLockException;
027    import org.granite.tide.data.TidePersistenceAdapter;
028    import org.hibernate.Criteria;
029    import org.hibernate.Session;
030    import org.hibernate.SessionFactory;
031    import org.hibernate.criterion.Restrictions;
032    
033    /**
034     * Implementation of Tide persistence adapter with a Hibernate Session
035     * @author William DRAI
036     *
037     */
038    public 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    }