13.3. Dynamics in Generalization Hierarchies
Classes arranged in a generalization hierarchy may also have lifecycles formalized using state machines. Depending on the behavioral differences between the subclasses, we may choose to model separate lifecycles for each subclass or a single lifecycle for the superclass.
13.3.1. Superclass State Machines
Figure 6.13 on page 97 showed how the Product is divided into subclasses for Books, Recordings, and Software. This distinction, however, does not make a difference to the basic lifecycle of a Product. All products are proposed, approved for sale, finally discontinued from sale, and possibly reinstated. Since this basic lifecycle applies to all types of Product, we formalize a single superclass state ...
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