Provides an interface for creating families of related or dependent objects without
specifying their concrete classes.
Category:
Creational
UML Diagram:
Description of the Demonstration:
There are three subclasses of PizzaShop (NYPizzaShop, ChicagoPizzaShop, and CaliforniaPizzaShop)
each of which overrides the virtual function PizzaShop::createPizza. There are four types
or sub-classes of Pizza; CheesePizza, ClamPizza, VeggiePizza, and PepperoniPizza. Each type
of pizza consists of up to six PizzaIngredients: Dough, Sauce, Cheese, Veggies, Clams and Pepperoni.
But, each regional pizza shop uses different versions (sub-classes) of these five ingredients.
To handle creation of pizzas specific to the region an instance of Pizza, whether CheesePizza,
ClamPizza, VeggiePizza or PepperoniPizza is given a pointer to an instance of the appropriate
regional sub-class of the parent PizzaIngredientFactory which is the Abstract Factory. This
Abstract Factory class defines the standard interface functions createDough, createSauce, createCheese,
createVeggies, createClams, and createPepperoni. It is the sub-class of PizzaIngredientFactory that
handles the actual creation of the concrete Pizza class with the correct regional style ingredients
appropriate to its' regional PizzaShop.
Code:
Click here to download a
zip file containing all the source files and an executable of the
Demonstration. See the _ReadMe.txt file in the zip.
