Hibernate example source code file (DefaultRevisionInfoGenerator.java)

This example Hibernate source code file (DefaultRevisionInfoGenerator.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Hibernate tags/keywords

class, class, date, defaultrevisioninfogenerator, defaultrevisioninfogenerator, entitytrackingrevisionlistener, io, mappingexception, object, object, propertydata, revisionlistener, setter, string, string, util

The Hibernate DefaultRevisionInfoGenerator.java source code

/*
 * 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.revisioninfo;

import org.hibernate.MappingException;
import org.hibernate.Session;
import org.hibernate.envers.EntityTrackingRevisionListener;
import org.hibernate.envers.RevisionListener;
import org.hibernate.envers.RevisionType;
import org.hibernate.envers.entities.PropertyData;
import org.hibernate.envers.tools.reflection.ReflectionTools;
import org.hibernate.property.Setter;

import java.io.Serializable;
import java.util.Date;

/**
 * @author Adam Warski (adam at warski dot org)
 * @author Lukasz Antoniak (lukasz dot antoniak at gmail dot com)
 */
public class DefaultRevisionInfoGenerator implements RevisionInfoGenerator {
    private final String revisionInfoEntityName;
    private final RevisionListener listener;
    private final Setter revisionTimestampSetter;
    private final boolean timestampAsDate;
    private final Class<?> revisionInfoClass;

    public DefaultRevisionInfoGenerator(String revisionInfoEntityName, Class<?> revisionInfoClass,
                                       Class<? extends RevisionListener> listenerClass,
                                       PropertyData revisionInfoTimestampData,
                                       boolean timestampAsDate) {
        this.revisionInfoEntityName = revisionInfoEntityName;
        this.revisionInfoClass = revisionInfoClass;
        this.timestampAsDate = timestampAsDate;

        revisionTimestampSetter = ReflectionTools.getSetter(revisionInfoClass, revisionInfoTimestampData);

        if (!listenerClass.equals(RevisionListener.class)) {
            // This is not the default value.
            try {
                listener = listenerClass.newInstance();
            } catch (InstantiationException e) {
                throw new MappingException(e);
            } catch (IllegalAccessException e) {
                throw new MappingException(e);
            }
        } else {
            // Default listener - none
            listener = null;
        }
    }

	public void saveRevisionData(Session session, Object revisionData) {
        session.save(revisionInfoEntityName, revisionData);
	}

    public Object generate() {
		Object revisionInfo;
        try {
            revisionInfo = revisionInfoClass.newInstance();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

        long timestamp = System.currentTimeMillis();
        revisionTimestampSetter.set(revisionInfo, timestampAsDate ? new Date(timestamp) : timestamp, null);

        if (listener != null) {
            listener.newRevision(revisionInfo);
        }

        return revisionInfo;
    }

    public void entityChanged(Class entityClass, String entityName, Serializable entityId, RevisionType revisionType,
                              Object revisionInfo) {
        if (listener instanceof EntityTrackingRevisionListener) {
            ((EntityTrackingRevisionListener) listener).entityChanged(entityClass, entityName, entityId, revisionType,
                                                                      revisionInfo);
        }
    }
}