org.hibernate.envers.AuditReaderFactory.java Source code

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Here is the source code for org.hibernate.envers.AuditReaderFactory.java

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/*
 * Hibernate, Relational Persistence for Idiomatic Java
 *
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later.
 * See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
 */
package org.hibernate.envers;

import javax.persistence.EntityManager;

import org.hibernate.Session;
import org.hibernate.engine.spi.SessionImplementor;
import org.hibernate.envers.boot.internal.EnversService;
import org.hibernate.envers.exception.AuditException;
import org.hibernate.envers.internal.reader.AuditReaderImpl;
import org.hibernate.service.ServiceRegistry;

/**
 * @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;
        }

        final ServiceRegistry serviceRegistry = sessionImpl.getFactory().getServiceRegistry();
        final EnversService enversService = serviceRegistry.getService(EnversService.class);

        return new AuditReaderImpl(enversService, session, sessionImpl);
    }

    /**
     * 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!");
    }
}