I’ve recently come to a heuristic called the Law of Demeter (LoD) or Principle of Least Knowledge that says a module should not know about the innards of the objects it manipulates. More precisely, the method of a particular class should call:
- other methods of the same class
- objects created by the method itself
- objects passed as arguments to the method
- objects held in an instance variable of the same class
And that”s all!
So the following code appears to violate the Law:
String output = obj.getContext().getOptions().getDir().getPath();
It’s easy to forget something around such a structure. This one can solve the issue:
String output = obj.getPathFromContext();
