Archetype pattern

The Archetype pattern separates the logic from implementation; the separation is accomplished by there being two abstract classes, a decorator (for logic) and a delegate (for implementation). The Factory handles the mapping of decorator and delegate classes and returns the pair associated with a parameter or parameters passed. The interface is the contract between a decorator, a delegate and the calling class creating an Inversion of Responsibility. This example use two branches however you can have 'N' branches as required. The pattern means that one branch from the interface does not have to worry about how another branch operators as long it implements the interface.

Sections
Decorator

The descendants of the decorator class handle the logic, for example performing a calculation. The descendants of the decorator can then call the descendants of the delegated when or if they wish to pass responsibility for example storage or communication.

Delegate

The descendants of the delegate flow class handle the implementation for call a sub-system, storage, or communication. Different children can use completely different sub-systems storage, or communications than each other.

UML




Participants
Delegation pattern - calls the specific implementation

Decorator pattern - performs the generalised logic

Factory method pattern - creates the archetype combination