March 2002
Intermediate to advanced
496 pages
8h 51m
English
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Chapter 6. Bridge
The Bridge Pattern focuses on the implementation of an abstraction. Design Patterns (Gamma et al. 1995) uses the word abstraction to refer to a class that relies on a set of abstract operations, where several implementations of the set of abstract operations are possible.
The ordinary way to implement an abstraction is to create a class hierarchy, with an abstract class at the top that defines the abstract operations; each subclass in the hierarchy provides a different implementation of the set of abstract operations. This approach becomes insufficient when you need to subclass the hierarchy for another reason. It can also happen that the abstract operations need to be defined and implemented in advance of abstractions that ...
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