public boolean predicate2(Object dm, Designer dsgr) {
MClass cls, c;
if (!(dm instanceof MClass)) return false;
cls = (MClass) dm;
if (!cls.isAbstract()) return false; // original class was not abstract
VectorSet derived = (new VectorSet(cls)).reachable(new ChildGenDerivedClasses());
java.util.Enumeration enum = derived.elements();
while (enum.hasMoreElements()) {
c = (MClass) enum.nextElement();
if (!c.isAbstract()) return false; // found a concrete subclass
}
return true; // no concrete subclasses defined, this class is "useless"
}
