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.data;
023    
024    import java.io.Serializable;
025    
026    import javax.persistence.EntityManager;
027    import javax.persistence.OptimisticLockException;
028    
029    
030    /**
031     * Implementation of Tide persistence adapter with a JPA EntityManager
032     * @author William DRAI
033     *
034     */
035    public class JPAPersistenceAdapter implements TidePersistenceAdapter {
036            
037            protected EntityManager entityManager;
038    
039            
040            public JPAPersistenceAdapter(EntityManager entityManager) {
041                    this.entityManager = entityManager;
042            }
043    
044        /**
045         * Find an entity in the persistence context
046         * @param entityClass class of the looked up entity
047         * @param id entity identifier
048         * @return the entity with the persistence context.
049         */
050        public Object find(Class<?> entityClass, Serializable id) {
051            return entityManager.find(entityClass, id);
052        }
053    
054        /**
055         * Throw an optimistic locking error
056         * @param entity entity instance loaded from the database
057         */
058        public void throwOptimisticLockException(Object entity) {
059            throw new OptimisticLockException("Could not apply change for stale object", null, entity);
060        }
061    
062    }