Design Patterns Explained: A New Perspective on Object-Oriented Design

Thinking in Patterns: Step 2d (Abstract Factory)

All that is left is the Abstract Factory. As it turns out, this pattern is not needed. The rationale for using an Abstract Factory was to ensure all of the implementation objects were of type V1 if I had a V1 system or of type V2 if I had a V2 system. However, the Model object itself will know this. There is no point implementing a pattern if some other object can easily encapsulate the rules of creation. I left the Abstract Factory in the set of patterns because while I was first solving this problem I did think the Abstract Factory was present. It also illustrates how thinking that a pattern is present when it is not is not necessarily counterproductive.