com.hibernateGenericDAO.HibernateUtil.java Source code

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Here is the source code for com.hibernateGenericDAO.HibernateUtil.java

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/**
 * The MIT License (MIT)
 * Copyright (c) 2016 Marc-Antoine Dub
    
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
    
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
    
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package com.hibernateGenericDAO;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.tool.hbm2ddl.SchemaExport;

public class HibernateUtil {
    private static SessionFactory sessionFactory = null;

    /**
     * Singleton
     */
    private HibernateUtil() {

    }

    /**
     * Creates the db schema
     */
    @SuppressWarnings("unused")
    private static void createSchema() {
        Configuration configuration = new Configuration();
        configuration.configure("hibernate.cfg.xml");
        new SchemaExport(configuration).create(true, true);
    }

    /**
     * Creates a signle session factory
     * @return SessionFactory
     */
    private static synchronized final SessionFactory getSessionFactory() {
        if (sessionFactory == null) {
            Configuration configuration = new Configuration().configure("hibernate.cfg.xml");
            ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()
                    .applySettings(configuration.getProperties()).build();
            sessionFactory = configuration.buildSessionFactory(serviceRegistry);
        }
        return sessionFactory;
    }

    /**
     * Opens a transaction
     * @return
     */
    public static Session beginTransaction() {
        Session hibernateSession = HibernateUtil.getSession();
        hibernateSession.beginTransaction();
        return hibernateSession;
    }

    /**
     * Commits a transaction
     */
    public static void commitTransaction() {
        getSession().getTransaction().commit();
    }

    /**
     * Rollbacks a transaction
     */
    public static void rollbackTransaction() {
        getSession().getTransaction().rollback();
    }

    /**
     * Closes the session
     */
    public static void closeSession() {
        getSession().close();
    }

    /**
     * Gets the session
     * @return Session
     */
    public static Session getSession() {
        return getSessionFactory().getCurrentSession();
    }
}