private List<ClassDocImpl> getClasses(boolean filtered) {
        if (allClasses != null && !filtered) {
            return allClasses;
        }
        if (allClassesFiltered != null && filtered) {
            return allClassesFiltered;
        }
        ListBuffer<ClassDocImpl> classes = new ListBuffer<ClassDocImpl>();
        for (Scope.Entry e = sym.members().elems; e != null; e = e.sibling) {
            if (e.sym != null) {
                ClassSymbol s = (ClassSymbol)e.sym;
                ClassDocImpl c = env.getClassDoc(s);
                if (c != null && !c.isSynthetic())
                    c.addAllClasses(classes, filtered);
            }
        }
        if (filtered)
            return allClassesFiltered = classes.toList();
        else
            return allClasses = classes.toList();
    }