Thinking in Patterns: Step 3
The details of the design may still take some work. However, I would continue with the design by following Alexander's mandate of designing by context. For example, when I see how I need to implement a SlotFeature class or the V1Imp class, I should remember how the patterns involved are used. In this case, I note that in the Bridge pattern, the methods involving the abstractions are independent of implementation. This means that the Abstraction class (Feature) and all of its derivations (SlotFeature, HoleFeature, and so forth) contain no implementation information. Implementation information is left to the Implementation classes.
This means the Feature derivations will have methods such as getLocation and getLength ...
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