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Programming - Abstract Factory Design Pattern


Provide an interface for creating families of related or dependent objects without specifying their concrete classes.
The classes and/or objects participating in the example are:


  • AbstractFactory
    • declares an interface for operations that create abstract products
  • ConcreteFactoryand
    • implements the operations to create concrete product objects
  • AbstractProduct
    • declares an interface for a type of product object
  • Productand
    • defines a product object to be created by the corresponding concrete factory
    • implements the AbstractProduct interface
  • Clientand
    • uses interfaces declared by AbstractFactory and AbstractProduct classes
// Abstract Factory pattern -- Structural example

using
System;

namespace DoFactory.GangOfFour.Abstract.Structural
{
// MainApp test application

class MainApp
{
public static void Main()
{
// Abstract factory #1
AbstractFactory factory1 = new ConcreteFactory1();
Client c1 = new Client(factory1);
c1.Run();

// Abstract factory #2
AbstractFactory factory2 = new ConcreteFactory2();
Client c2 = new Client(factory2);
c2.Run();

// Wait for user input
Console.Read();
}
}

// "AbstractFactory"

abstract class AbstractFactory
{
public abstract AbstractProductA CreateProductA();
public abstract AbstractProductB CreateProductB();
}

// "ConcreteFactory1"

class ConcreteFactory1 : AbstractFactory
{
public override AbstractProductA CreateProductA()
{
return new ProductA1();
}
public override AbstractProductB CreateProductB()
{
return new ProductB1();
}
}

// "ConcreteFactory2"

class ConcreteFactory2 : AbstractFactory
{
public override AbstractProductA CreateProductA()
{
return new ProductA2();
}
public override AbstractProductB CreateProductB()
{
return new ProductB2();
}
}

// "AbstractProductA"

abstract class AbstractProductA
{
}

// "AbstractProductB"

abstract class AbstractProductB
{
public abstract void Interact(AbstractProductA a);
}

// "ProductA1"

class ProductA1 : AbstractProductA
{
}

// "ProductB1"

class ProductB1 : AbstractProductB
{
public override void Interact(AbstractProductA a)
{
Console.WriteLine(this.GetType().Name +
" interacts with " + a.GetType().Name);
}
}

// "ProductA2"

class ProductA2 : AbstractProductA
{
}

// "ProductB2"

class ProductB2 : AbstractProductB
{
public override void Interact(AbstractProductA a)
{
Console.WriteLine(this.GetType().Name +
" interacts with " + a.GetType().Name);
}
}

// "Client" - the interaction environment of the products

class Client
{
private AbstractProductA AbstractProductA;
private AbstractProductB AbstractProductB;

// Constructor
public Client(AbstractFactory factory)
{
AbstractProductB = factory.CreateProductB();
AbstractProductA = factory.CreateProductA();
}

public void Run()
{
AbstractProductB.Interact(AbstractProductA);
}
}
}
and
Output to be expected:
and
ProductB1 interacts with ProductA1
ProductB2 interacts with ProductA2



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