/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Middleware LLC.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program 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 distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*/
package org.hibernate.envers;
import static org.hibernate.envers.tools.ArraysTools.arrayIncludesInstanceOf;
import javax.persistence.EntityManager;
import org.hibernate.Session;
import org.hibernate.engine.SessionImplementor;
import org.hibernate.envers.event.AuditEventListener;
import org.hibernate.envers.exception.AuditException;
import org.hibernate.envers.reader.AuditReaderImpl;
import org.hibernate.event.EventListeners;
import org.hibernate.event.PostInsertEventListener;
/**
* @author Adam Warski (adam at warski dot org)
*/
public class AuditReaderFactory {
private AuditReaderFactory() { }
/**
* Create an audit reader associated with an open session.
* @param session An open session.
* @return An audit reader associated with the given sesison. It shouldn't be used
* after the session is closed.
* @throws AuditException When the given required listeners aren't installed.
*/
public static AuditReader get(Session session) throws AuditException {
SessionImplementor sessionImpl;
if (!(session instanceof SessionImplementor)) {
sessionImpl = (SessionImplementor) session.getSessionFactory().getCurrentSession();
} else {
sessionImpl = (SessionImplementor) session;
}
EventListeners listeners = sessionImpl.getListeners();
for (PostInsertEventListener listener : listeners.getPostInsertEventListeners()) {
if (listener instanceof AuditEventListener) {
if (arrayIncludesInstanceOf(listeners.getPostUpdateEventListeners(), AuditEventListener.class) &&
arrayIncludesInstanceOf(listeners.getPostDeleteEventListeners(), AuditEventListener.class)) {
return new AuditReaderImpl(((AuditEventListener) listener).getVerCfg(), session,
sessionImpl);
}
}
}
throw new AuditException("You need to install the org.hibernate.envers.event.AuditEventListener " +
"class as post insert, update and delete event listener.");
}
/**
* Create an audit reader associated with an open entity manager.
* @param entityManager An open entity manager.
* @return An audit reader associated with the given entity manager. It shouldn't be used
* after the entity manager is closed.
* @throws AuditException When the given entity manager is not based on Hibernate, or if the required
* listeners aren't installed.
*/
public static AuditReader get(EntityManager entityManager) throws AuditException {
if (entityManager.getDelegate() instanceof Session) {
return get((Session) entityManager.getDelegate());
}
if (entityManager.getDelegate() instanceof EntityManager) {
return get((EntityManager) entityManager.getDelegate());
}
throw new AuditException("Hibernate EntityManager not present!");
}
}