Bridge Pattern

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Bridge Pattern

Intent

• The intent of this pattern is to decouple abstraction from implementation so that the two can vary independently.

Implementation

The figure below shows a UML class diagram for the Bridge Pattern:

The participants classes in the bridge pattern are:

• Abstraction - Abstraction defines abstraction interface.
• AbstractionImpl - Implements the abstraction interface using a reference to an object of type Implementor.
• Implementor - Implementor defines the interface for implementation classes. This interface does not need to correspond directly to abstraction interface and can be very different. Abstraction imp provides an implementation in terms of operations provided by Implementor interface.
• ConcreteImplementor1, ConcreteImplementor2 - Implements the Implementor interface.

Description

An Abstraction can be implemented by an abstraction implementation, and this implementation does not depend on any concrete implementers of the Implementor interface. Extending the abstraction does not affect the Implementor. Also extending the Implementor has no effect on the Abstraction.

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