/**
     * Return a new Session object that must be closed when the work has been completed.
     *
     * @param factoryName the config file must match the meta attribute "config-file" in the hibernate mapping file
     * @return the active Session
     */
    public static Session createSession(String factoryName, Interceptor interceptor) throws HibernateException
    {
        java.util.Stack sessionStack = (java.util.Stack) threadedSessions.get();
        Session session = null;

        if (sessionStack == null)
        {
            sessionStack = new java.util.Stack();
            threadedSessions.set(sessionStack);
        }

        if (sessionStack.size() > 0)
        {
            Object[] arr = (Object[]) sessionStack.peek();
            String cf = (String) arr[0];
            if (cf == null)
                session = (Session) arr[1];
            else if (cf != null && factoryName != null)
            {
                if (cf.equals(factoryName))
                    session = (Session) arr[1];
            }
            if (session == null)
            {
                if (interceptor != null)
                    session = getSessionFactory(factoryName).openSession(interceptor);
                else
                    session = getSessionFactory(factoryName).openSession();

                arr = new Object[2];
                arr[0] = factoryName;
                arr[1] = session;
                sessionStack.push(arr);
            }
        }
        else
        {
            if (interceptor != null)
                session = getSessionFactory(factoryName).openSession(interceptor);
            else
                session = getSessionFactory(factoryName).openSession();

            Object[] arr = new Object[2];
            arr = new Object[2];
            arr[0] = factoryName;
            arr[1] = session;
            sessionStack.push(arr);
        }

        return session;
    }

class InterchangeableInterceptor implements Interceptor {
         Interceptor delegate;
         ...--implment all the methods on interceptor and delegate to the delegate
        void setInterceptor(Interceptor interceptor)...
}