Static Class Structure

• Abstraction
  • Defines an interface for an abstraction.
• Abstraction1,…
  • Implement the Abstraction interface in terms of (by delegating to) the Implementor interface (imp.operationImp()).
  • Maintains a reference (imp) to an Implementor object.
• Implementor
  • For all supported implementations, defines a common interface for implementing an abstraction.
  • "Typically the Implementor interface provides only primitive operations, and Abstraction defines higher-level operations based on these primitives." [GoF, p154]
• Implementor1,…
  • Implement the Implementor interface.

Dynamic Object Collaboration

• In this sample scenario, an Abstraction1 object delegates implementation to an Implementor1 object (by calling operationImp() on Implementor1).
• See also Sample Code / Example 1.