private static PsiClass getSuperQualifier(PsiClass aClass, PsiClass targetClass) {
    if (targetClass != null) {
      if (targetClass.isInheritor(aClass, false)) {
        return aClass;
      }

      for (PsiClassType type : targetClass.getSuperTypes()) {
        PsiClass superClass = type.resolve();
        if (InheritanceUtil.isInheritorOrSelf(superClass, aClass, true)) {
          return superClass.isInterface() ? superClass : null;
        }
      }
    }
    return null;
  }
private static PsiClass getSuperQualifier(PsiClass aClass, PsiClass targetClass)