If the cases are fixed, that should be reflected in simpler code. The code can only be simpler if it takes advantage of the fact that the cases are fixed. Becau

If the cases are fixed, that should be reflected in simpler code. The code can only be simpler if it takes advantage of the fact that the cases are fixed. Because of that it's kind of required to "close" them. A plugin architecture is an entirely different kind of beast, and rarely needed. It requires some sort of interface to achieve the decoupling. Inheritance is one option here, albeit an ugly one.