Bridge Pattern

The Bridge pattern divides a complex component into two separate but related inheritance hierarchies: the functional abstraction and the internal implementation. This makes it easier to change either aspect of the component so that the two can vary independently. The Bridge pattern is useful when there is a hierarchy of abstractions and a corresponding hierarchy of implementations. Rather than combining the abstractions and implementations into many distinct classes, the Bridge pattern implements the abstractions and implementations as independent classes that can be combined dynamically. 

UML representation

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The following lists the benefits of using the Bridge pattern:
  • Enables you to separate the interface from the implementation improves extensibility
  • Hides implementation details from clients

When to Use

You should use the Bridge pattern when:
  • You want to avoid a permanent binding between an abstraction and its implementation.
  • Both the abstractions and their implementations should be extensible using subclasses.
  • Changes in the implementation of an abstraction should have no impact on clients; that is, you should not have to recompile their code.
Subpages (1): Bridge Pattern Example