Design Patterns by Elements Of Reusable Object Oriented Software

Author:Elements Of Reusable Object Oriented Software [Software, Elements Of Reusable Object Oriented]
Format: epub
Publisher: ePub Bud (www.epubbud.com)
Published: 2011-08-23T16:00:00+00:00

The Bridge pattern addresses these problems by putting the Window abstraction and its implementation in separate class hierarchies. There is one class hierarchy for window interfaces (Window, IconWindow, TransientWindow) and a separate hierarchy for platform-specific window implementations, with WindowImp as its root. The XWindowImp subclass, for example, provides an implementation based on the X Window System.

All operations on Window subclasses are implemented in terms of abstract operations from the WindowImp interface. This decouples the window abstractions from the various platform-specific implementations. We refer to the relationship between Window and WindowImp as a bridge, because it bridges the abstraction and its implementation, letting them vary independently.

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