de.rs.scrumit.dao.BaseEntityAuditDao.java Source code

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Here is the source code for de.rs.scrumit.dao.BaseEntityAuditDao.java

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/*
 * Copyright (C) 2014  Robert Stark
 * 
 * This program is free software; you can redistribute it and/or modify it under the terms of
 * the GNU General Public License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 * 
 * 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along with this program;
 * if not, see <http://www.gnu.org/licenses/>.
 */
package de.rs.scrumit.dao;

import java.text.SimpleDateFormat;
import java.util.List;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

import org.hibernate.envers.AuditReader;
import org.hibernate.envers.AuditReaderFactory;
import org.hibernate.envers.RevisionType;
import org.hibernate.envers.query.AuditEntity;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;

import de.rs.scrumit.entity.BaseEntityAuditModel;

@Repository
public class BaseEntityAuditDao {

    private static final Logger LOGGER = LoggerFactory.getLogger(BaseEntityAuditDao.class);

    @PersistenceContext
    private EntityManager entityManager;

    @Transactional(readOnly = true)
    public <T extends BaseEntityAuditModel> T getByRevision(Class<T> modelClass, Number revision) {
        AuditReader reader = AuditReaderFactory.get(entityManager);
        T model = reader.findRevision(modelClass, revision);
        return model;
    }

    @Transactional(readOnly = true)
    public <T extends BaseEntityAuditModel> void printChangeHistory(Class<T> modelClass, String code) {
        AuditReader reader = AuditReaderFactory.get(entityManager);

        List<?> results = reader.createQuery().forRevisionsOfEntity(modelClass, false, true)
                .add(AuditEntity.property("code").eq(code)).addOrder(AuditEntity.property("changedAt").asc())
                .getResultList();

        SimpleDateFormat format = new SimpleDateFormat("dd.MM.yyyy hh:mm:ss");
        for (Object entry : results) {
            BaseEntityAuditModel model = (BaseEntityAuditModel) ((Object[]) entry)[0];
            RevisionType type = (RevisionType) ((Object[]) entry)[2];
            String msg = type + " entry with code " + model.getCode() + " at time: "
                    + format.format(model.getChangedAt());
            LOGGER.debug(msg);
            System.out.println(msg);
        }
    }
}