EJB3Configuration.java

package org.needle4j.db.configuration;

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

import org.hibernate.ejb.Ejb3Configuration;
import org.needle4j.configuration.PropertyBasedConfigurationFactory;

/**
 * Allows a fine configuration of an {@link EntityManagerFactory}.
 */
@Deprecated
class EJB3Configuration implements PersistenceConfiguration {

    private final EntityManagerFactory factory;
    private final EntityManager entityManager;

    /**
     * Creates an {@link EntityManagerFactory} and {@link EntityManager} for the
     * given entity classes by using the configured hibernate specific
     * configuration file (*cfg.xml).
     * 
     * @param entityClasses
     *            the entity classes
     */
    public EJB3Configuration(final Class<?>[] entityClasses) {
        factory = createEntityManagerFactory(entityClasses);
        entityManager = EntityManagerProxyFactory.createProxy(factory.createEntityManager());
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public EntityManager getEntityManager() {
        return entityManager;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public EntityManagerFactory getEntityManagerFactory() {
        return factory;
    }

    private static EntityManagerFactory createEntityManagerFactory(final Class<?>[] entityClasses) {
        final Ejb3Configuration cfg = new Ejb3Configuration();

        // add a regular hibernate.cfg.xml
        cfg.configure(PropertyBasedConfigurationFactory.get().getHibernateCfgFilename());

        for (final Class<?> clazz : entityClasses) {
            cfg.addAnnotatedClass(clazz);
        }

        return cfg.buildEntityManagerFactory();

    }
}