Design Patterns Explained (4) - Adapter

原创于 2004-09-16 12:30:00 发布 · 921 阅读

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#interface #inheritance #class #object #behavior #system

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博客介绍了适配器模式，旨在将一个类的接口转换为客户端期望的另一个接口，使因接口不兼容而无法协作的类能一起工作。指出系统存在数据和行为正确但接口错误的问题，给出包装的解决方案，还提及对象适配器和类适配器两种变体及与外观模式的差异。

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intent: Convert the interface of a class into another interface that the clients expect. Adapter lets classes work together that could not otherwise because of incompatible interface.

Problem: A system has the right data and behavior but the wrong interface. Typically used when you have to make something a derivative of an abstract class we are defining or already have.

Solution: Warp it

variation : Oject Adapter, Class Adapter.

Object Adapter pattern - composition
Class Adapter pattern - inheritance

Difference between Facade and Adapter

	Facade	Adapter
Are there preexisting classes?	Yes	Yes
Is there an interface we must design to?	No	Yes
Does an object need to behave polymorphically?	No	Yes
Is a simpler interface needed?	Yes	No