Hibernate.Util.HibernateUtil.java Source code

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Here is the source code for Hibernate.Util.HibernateUtil.java

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package Hibernate.Util;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URL;
import java.util.List;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.jdom2.Element;
import org.jdom2.JDOMException;
import org.jdom2.filter.Filters;
import org.jdom2.input.SAXBuilder;
import org.jdom2.output.DOMOutputter;
import org.jdom2.xpath.XPathExpression;
import org.jdom2.xpath.XPathFactory;
import org.jdom2.Document;

/**
 * Hibernate Utility class with a convenient method to get Session Factory
 * object.
 *
 * @author I.S.C Salvador
 */
public class HibernateUtil {

    private static SessionFactory sessionFactory;
    private static URL xmlFileURL;

    static {
        //xmlFileURL = HibernateUtil.class.getClassLoader().getResource("hibernate.cfg.xml"); 

        try {
            File f = new File("hibernate.cfg.xml");
            xmlFileURL = f.toURL();

            // Create the SessionFactory from standard (hibernate.cfg.xml) 
            // config file.
            //sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();
            sessionFactory = new Configuration().configure(xmlFileURL).buildSessionFactory();
        } catch (Exception ex) {
            // Log the exception. 
            System.err.println("Initial SessionFactory error en la creacin." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }

    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }

    public static void configureConnect(String dataBaseName, String userName, String password)
            throws FileNotFoundException, JDOMException, IOException {
        //sessionFactory.close();
        sessionFactory = new Configuration().configure(Configuracion(dataBaseName, userName, password))
                .buildSessionFactory();
    }

    private static org.w3c.dom.Document Configuracion(String dataBaseName, String userName, String password)
            throws FileNotFoundException, JDOMException, IOException {

        Document documentJDOM = new SAXBuilder().build(xmlFileURL);
        XPathExpression<Element> xPathExpression = XPathFactory.instance()
                .compile("/hibernate-configuration/session-factory/property", Filters.element());
        List<Element> elementList = xPathExpression.evaluate(documentJDOM);
        //Esto es relativo a en que posicin aparecen las lineas en el hibernate.cfg.xml
        elementList.get(2).setText(dataBaseName);
        elementList.get(3).setText(userName);
        elementList.get(4).setText(password);
        DOMOutputter domOutputter = new DOMOutputter();
        return domOutputter.output(documentJDOM);
    }
}