July 2001
Intermediate to advanced
656 pages
15h 51m
English
book
Applying UML and Patterns: An Introduction to Object-Oriented Analysis and Design and the Unified Process, Second Edition
by Craig Larman
Content preview from Applying UML and Patterns: An Introduction to Object-Oriented Analysis and Design and the Unified Process, Second Edition
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23.1. Adapter (GoF)
The problem explored in the previous chapter to motivate the Polymorphism pattern, and its solution, is more specifically an example of the GoF Adapter pattern.
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Adapter Context/Problem How to resolve incompatible interfaces, or provide a stable interface to similar components with different interfaces? Solution Convert the original interface of a component into another interface, through an intermediate adapter object. |
To review: The NextGen POS system needs to support several kinds of external third-party services, including tax calculators, credit authorization services, inventory systems, and accounting systems, among others. Each has a different API, which can't be changed.
A solution is to add a level of indirection ...
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