Java - Reconectar hibernate a otra base de datos en tiempo de ejecución con jdom2

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

  <session-factory>

    <property name="connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>

    <property name="c3p0.acquire_increment">1</property>

    <property name="c3p0.idle_test_period">100</property>

    <property name="c3p0.max_size">5</property>

    <property name="c3p0.max_statements">10</property>

    <property name="c3p0.min_size">3</property>

    <property name="c3p0.timeout">200</property>

    <property name="connection.driver_class">DRIVER DEL JDBC</property>

    <property name="connection.url">DIRECCION DE LA BASE DE DATOS</property>

    <property name="connection.username">USUARIO</property>

    <property name="connection.password">CONTRASEÑA</property>

    <property name="dialect">DIALECTO DE LA BASE DE DATOS</property>

    <property name="show_sql">false</property>

    <property name="hbm2ddl.auto">update</property>

    */---------------------------

    Mapeo de las clases.

    ---------------------------*/

  </session-factory>

</hibernate-configuration>

import java.io.FileNotFoundException;

import java.io.IOException;

import java.net.URL;

import java.util.List;

import org.hibernate.HibernateException;

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;

public class HibernateUtil {

	private static URL xmlFileURL;

	private static SessionFactory sessionFactory;

    static {

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

        try {

            sessionFactory = new Configuration().configure(xmlFileURL).buildSessionFactory();

        }

        catch (HibernateException exception) {

        	System.out.println("Ocurrio un error en la inicializacion de la SessionFactory: " + exception);

        	throw new ExceptionInInitializerError(exception);

        }

    }

    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(modifyConnectConfiguration(dataBaseName, userName, password)).buildSessionFactory();

    }

    private static org.w3c.dom.Document modifyConnectConfiguration(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 posición aparecen las lineas en el hibernate.cfg.xml

    	elementList.get(8).setText(dataBaseName);

    	elementList.get(9).setText(userName);

    	elementList.get(10).setText(password);

        DOMOutputter domOutputter = new DOMOutputter();

        return domOutputter.output(documentJDOM);

    }

}