Prototype

Origin:

GoF 95

Reason:

Create customized objects, the products, without knowing their exact classes or construction details.

Synopsis:

A class, the Client, stores an instance, the Prototype, of every product it may create. A method of the Client registers prototypical instances.

Example:

A CAD program allows users to draw symbols from a palette. It must be easy to provide additional symbols.

Solution:

PrototypeIF	Interface implemented by all the products.	symbols of CAD program
Prototype	Implements the PrototypeIF interface and is cloned.
PrototypeBuilder	Supplies prototypical objects.