JPAPersistenceAdapter.java

/**
 *   GRANITE DATA SERVICES
 *   Copyright (C) 2006-2015 GRANITE DATA SERVICES S.A.S.
 *
 *   This file is part of the Granite Data Services Platform.
 *
 *   Granite Data Services is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU Lesser General Public
 *   License as published by the Free Software Foundation; either
 *   version 2.1 of the License, or (at your option) any later version.
 *
 *   Granite Data Services is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
 *   General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public
 *   License along with this library; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
 *   USA, or see <http://www.gnu.org/licenses/>.
 */
package org.granite.tide.data;

import java.io.Serializable;

import javax.persistence.EntityManager;
import javax.persistence.OptimisticLockException;


/**
 * Implementation of Tide persistence adapter with a JPA EntityManager
 * @author William DRAI
 *
 */
public class JPAPersistenceAdapter implements TidePersistenceAdapter {
	
	protected EntityManager entityManager;

	
	public JPAPersistenceAdapter(EntityManager entityManager) {
		this.entityManager = entityManager;
	}

    /**
     * Find an entity in the persistence context
     * @param entityClass class of the looked up entity
     * @param id entity identifier
     * @return the entity with the persistence context.
     */
    public Object find(Class<?> entityClass, Serializable id) {
        return entityManager.find(entityClass, id);
    }

    /**
     * Throw an optimistic locking error
     * @param entity entity instance loaded from the database
     */
    public void throwOptimisticLockException(Object entity) {
        throw new OptimisticLockException("Could not apply change for stale object", null, entity);
    }

}