public Set getClassNames()
    {
        HashSet result = new HashSet();
        LongVector v = items;
        int size = numOfItems;
        for (int i = 1; i < size; ++i) {
            String className = ((ConstInfo) v.elementAt(i)).getClassName(this);
            if (className != null)
               result.add(className);
        }
        return result;
    }