/*
 * Copyright 2008,  Unitils.org
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.unitils.orm.jpa.util.provider.hibernate;

import java.util.Map;

import javax.persistence.EntityManagerFactory;
import javax.persistence.spi.PersistenceUnitInfo;

import org.hibernate.ejb.Ejb3Configuration;
import org.hibernate.ejb.HibernatePersistence;


/**
 * Subclass of hibernate's own implementation of <code>javax.persistence.spi.PersistenceProvider</code>.
 * Enables getting hold on the <code>org.hibernate.ejb.Ejb3Configuration</code> object that was used for
 * configuring the <code>EntityManagerFactory</code> after it was created.
 *  
 * @author Filip Neven
 * @author Tim Ducheyne
 */
public class UnitilsHibernatePersistenceProvider extends HibernatePersistence {

	/**
	 * The hibernate configuration object that was used for configuring the <code>EntityManagerFactory</code>
	 */
	private Ejb3Configuration hibernateConfiguration;
	
	
	@Override
	@SuppressWarnings("unchecked")
	public EntityManagerFactory createContainerEntityManagerFactory(PersistenceUnitInfo info, Map map) {
		Ejb3Configuration configuration = new Ejb3Configuration();
		hibernateConfiguration = configuration.configure( info, map );
		return hibernateConfiguration != null ? hibernateConfiguration.buildEntityManagerFactory() : null;
	}

	
	/**
	 * Should not be used until after creating the <code>EntityManagerFactory</code> using 
	 * {@link #createContainerEntityManagerFactory}
	 * 
	 * @return The hibernate configuration object that was used for configuring the <code>EntityManagerFactory</code>.
	 */
	public Ejb3Configuration getHibernateConfiguration() {
		return hibernateConfiguration;
	}

}