package classmate;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

public class HibernateUtil {

	private static Log log = LogFactory.getLog(HibernateUtil.class);

	private static final SessionFactory sessionFactory;

	static {
		try {
			// Create the SessionFactory
			sessionFactory = new Configuration().configure().buildSessionFactory();
		} catch (Throwable ex) {
			ex.printStackTrace();
			//log.error("Initial SessionFactory creation failed.", ex);
			throw new ExceptionInInitializerError(ex);
		}
	}

	public static final ThreadLocal session = new ThreadLocal();

	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.isOpen()) {
			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();
	}
}