code: public boolean isStaticMethodCallOnClass(MethodCall call, ClassNode receiver) {
          ClassNode staticReceiver = extractStaticReceiver(call);
          return staticReceiver!=null && staticReceiver.equals(receiver);
      }
docs: Given a method call, checks if it's a static method call and if it is, tells if the receiver matches
  the one supplied as an argument.
  @param call a method call
  @param receiver a class node
  @return true if the method call is a static method call on the receiver