@Override
    public void visitClass(@NotNull PsiClass aClass) {
      // no call to super, so that it doesn't drill down to inner classes
      if (!UtilityClassUtil.isUtilityClass(aClass)) {
        return;
      }
      if (!hasPublicConstructor(aClass)) {
        return;
      }

      final SearchScope scope = GlobalSearchScope.projectScope(aClass.getProject());
      final Query<PsiClass> query = ClassInheritorsSearch.search(aClass, scope, false);
      final PsiClass subclass = query.findFirst();
      Boolean hasInheritors = subclass != null;

      registerClassError(aClass, aClass, hasInheritors);
    }
@Override
    public void visitClass(@NotNull PsiClass aClass)