public EntityManagerImpl(SessionFactory sessionFactory,
    PersistenceContextType pcType,
    PersistenceUnitTransactionType transactionType,
    boolean discardOnClose,
    Class sessionInterceptorClass,
    Map properties) 
{
		super( pcType, transactionType, properties );
		this.sessionFactory = sessionFactory;
		this.open = true;
		this.discardOnClose = discardOnClose;
		Object localSic = null;
		if (properties != null) localSic = properties.get( HibernatePersistence.SESSION_INTERCEPTOR );
		if ( localSic != null ) {
			if (localSic instanceof Class) {
				sessionInterceptorClass = (Class) localSic;
			}
			else if (localSic instanceof String) {
				try {
					sessionInterceptorClass =
							ReflectHelper.classForName( (String) localSic, EntityManagerImpl.class );
				}
				catch (ClassNotFoundException e) {
					throw new PersistenceException("Unable to instanciate interceptor: " + localSic, e);
				}
			}
			else {
				throw new PersistenceException("Unable to instanciate interceptor: " + localSic);
			}
		}
		this.sessionInterceptorClass = sessionInterceptorClass;
		postInit();
}

 public  void close() 
{
		if ( !open ) throw new IllegalStateException( "EntityManager is closed" );
		if ( !discardOnClose && isTransactionInProgress() ) {
			//delay the closing till the end of the enlisted transaction
			getSession().getTransaction().registerSynchronization(
					new Synchronization() {
						public void beforeCompletion() {
							//nothing to do
						}
						public void afterCompletion(int i) {
							if ( session != null ) {
								if ( session.isOpen() ) {
									log.debug( "Closing entity manager after transaction completion" );
									session.close();
								}
								else {
									log.warn( "Entity Manager closed by someone else ({} must not be used)",
											Environment.AUTO_CLOSE_SESSION);
								}
							}
							//TODO session == null should not happen
						}
					}
			);
		}
		else {
			//close right now
			if ( session != null ) session.close();
		}
		open = false;
}

 protected Session getRawSession() 
{
		if ( session == null ) {
			Interceptor interceptor = null;
			if (sessionInterceptorClass != null) {
				try {
					interceptor = (Interceptor) sessionInterceptorClass.newInstance();
				}
				catch (InstantiationException e) {
					throw new PersistenceException("Unable to instanciate session interceptor: " + sessionInterceptorClass, e);
				}
				catch (IllegalAccessException e) {
					throw new PersistenceException("Unable to instanciate session interceptor: " + sessionInterceptorClass, e);
				}
				catch (ClassCastException e) {
					throw new PersistenceException("Session interceptor does not implement Interceptor: " + sessionInterceptorClass, e);
				}
			}
			session = sessionFactory.openSession( interceptor );
			if ( persistenceContextType == PersistenceContextType.TRANSACTION ) {
				( (SessionImplementor) session ).setAutoClear( true );
			}
		}
		return session;
}

 public Session getSession() 
{
		if ( !open ) throw new IllegalStateException( "EntityManager is closed" );
		return getRawSession();
}

 public boolean isOpen() 
{
		//adjustFlushMode(); //don't adjust, can't be done on closed EM
		try {
			if ( open ) getSession().isOpen(); //to force enlistment in tx
			return open;
		}
		catch (HibernateException he) {
			throwPersistenceException( he );
			return false;
		}
}