HibernateUtil.java

/*
 * Created on 13 juin 2004
 *
 * 
 * 
 */
package fr.mch.mdo.restaurant.dao.hibernate;

import java.io.IOException;
import java.io.InputStream;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.internal.util.xml.DTDEntityResolver;
import org.w3c.dom.Document;
import org.xml.sax.SAXException;

import fr.mch.mdo.logs.ILogger;
import fr.mch.mdo.restaurant.resources.IResources;
import fr.mch.mdo.restaurant.services.logs.LoggerServiceImpl;

/**
 * @author Mathieu MA sous conrad
 * 
 *         To change the template for this generated type comment go to Window -
 *         Preferences - Java - Code Generation - Code and Comments
 */
public class HibernateUtil 
{
	private static ILogger logger;

	private static final SessionFactory sessionFactory;
	private static final ThreadLocal<Session> session = new ThreadLocal<Session>();

	static {
		try {
			logger = LoggerServiceImpl.getInstance().getLogger(HibernateUtil.class.getName());

			// Configuration with configuration path file
			InputStream is = IResources.class.getResourceAsStream(IResources.HIBERNATE_CONFIGURATION_FILE);
			if (is != null) {
				DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
				DocumentBuilder builder = factory.newDocumentBuilder();

				// Use Hibernate Entity Resolver in case of off-line application
				builder.setEntityResolver(new DTDEntityResolver());
				Document document = builder.parse(is);
				Configuration configuration = new Configuration().configure(document);

				if (configuration != null) {
					// Create the SessionFactory
					sessionFactory = configuration.buildSessionFactory();
				} else {
					logger.error("Could not initialize Hibernate configuration");
					throw new RuntimeException("Could not initialize Hibernate configuration");
				}
			} else {
				logger.error("Could not initialize Hibernate configuration");
				throw new RuntimeException("Could not initialize Hibernate configuration");
			}
		} catch (HibernateException e) {
			logger.error(e.getMessage(), e);
			throw new RuntimeException("Configuration problem: " + e.getMessage(), e);
		} catch (SAXException e) {
			logger.error(e.getMessage(), e);
			throw new RuntimeException("Configuration problem: " + e.getMessage(), e);
		} catch (IOException e) {
			logger.error(e.getMessage(), e);
			throw new RuntimeException("Configuration problem: " + e.getMessage(), e);
		} catch (ParserConfigurationException e) {
			logger.error(e.getMessage(), e);
			throw new RuntimeException("Configuration problem: " + e.getMessage(), e);
		}
	}

	public static Session currentSession() throws HibernateException {
		Session s = (Session) session.get();
		// Open a new Session, if this Thread has none yet
		if (s == null) {
			s = sessionFactory.openSession();
			session.set(s);
		}
		return s;
	}

	public static void closeSession() throws HibernateException {
		Session s = (Session) session.get();
		session.set(null);
		if (s != null) {
			s.close();
		}
	}
}