Bridge

Usage

• Also known as: Handle / Body
• Separate an object’s interface from its implementation
• Decouple an abstraction from its implementation so that the two can vary independently

Diagram

Participants

Abstraction

• Defines the abstraction's interface.
• Maintains a reference to an object of type Implementor.

RefinedAbstraction

• Extends the interface defined by Abstraction.

Implementor

• Defines the interface for implementation classes. This interface doesn't have to correspond exactly to Abstraction's interface; in fact the two interfaces can be quite different. Typically the Implementation interface provides only primitive operations, and Abstraction defines higher-level operations based on these primitives.

ConcreteImplementor

• Implements the Implementor interface and defines its concrete implementation.