EntityManagerProvider.java

/**
 * Copyright (c) 2014 by the original author or authors.
 *
 * This code 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.
 *
 * The above copyright notice and this permission notice shall be included in all copies or
 * substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */


package ch.sdi.plugins.oxwall.job;

import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;

import org.hibernate.ejb.HibernateEntityManager;


/**
 * Provides access to the hibernate EntityManager.
 *
 * @version 1.0 (30.11.2014)
 * @author  Heri
 */
public class EntityManagerProvider
{

    private static EntityManagerFactory myFactory;

    /**
     * Retrieves the EntityManager with the given unit name.
     * <p>
     * @param aPersistenceUnit
     * @return
     */
    public static HibernateEntityManager getEntityManager( String aPersistenceUnit )
    {
        if ( myFactory == null )
        {
            myFactory = Persistence.createEntityManagerFactory( aPersistenceUnit );
        } // if myFactory == null

        EntityManager o =  myFactory.createEntityManager();
        return (HibernateEntityManager) o;

    }
}