抽象工厂设计模式
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定义
Provide an interface for creating families of related or dependent objects without specifying their concrete classes.
UML 类图表
参与者
The classes and/or objects participating in this pattern are:
- AbstractFactory (ContinentFactory)
- declares an interface for operations that create abstract products
- ConcreteFactory (AfricaFactory, AmericaFactory)
- implements the operations to create concrete product objects
- AbstractProduct (Herbivore, Carnivore)
- declares an interface for a type of product object
- Product (Wildebeest, Lion, Bison, Wolf)
- defines a product object to be created by the corresponding concrete factory
- implements the AbstractProduct interface
- Client (AnimalWorld)
- uses interfaces declared by AbstractFactory and AbstractProduct classes
简单源码(C#)
This structural code demonstrates the Abstract Factory pattern creating parallel hierarchies of objects. Object creation has been abstracted and there is no need for hard-coded class names in the client code.
// 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);
}
}
}
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);
}
}
}
This real-world code demonstrates the creation of different animal worlds for a computer game using different factories. Although the animals created by the Continent factories are different, the interactions among the animals remain the same.
// Abstract Factory pattern -- Real World example
using System;
namespace DoFactory.GangOfFour.Abstract.RealWorld
{
// MainApp test application
class MainApp
{
public static void Main()
{
// Create and run the Africa animal world
ContinentFactory africa = new AfricaFactory();
AnimalWorld world = new AnimalWorld(africa);
world.RunFoodChain();
// Create and run the America animal world
ContinentFactory america = new AmericaFactory();
world = new AnimalWorld(america);
world.RunFoodChain();
// Wait for user input
Console.Read();
}
}
// "AbstractFactory"
abstract class ContinentFactory
{
public abstract Herbivore CreateHerbivore();
public abstract Carnivore CreateCarnivore();
}
// "ConcreteFactory1"
class AfricaFactory : ContinentFactory
{
public override Herbivore CreateHerbivore()
{
return new Wildebeest();
}
public override Carnivore CreateCarnivore()
{
return new Lion();
}
}
// "ConcreteFactory2"
class AmericaFactory : ContinentFactory
{
public override Herbivore CreateHerbivore()
{
return new Bison();
}
public override Carnivore CreateCarnivore()
{
return new Wolf();
}
}
// "AbstractProductA"
abstract class Herbivore
{
}
// "AbstractProductB"
abstract class Carnivore
{
public abstract void Eat(Herbivore h);
}
// "ProductA1"
class Wildebeest : Herbivore
{
}
// "ProductB1"
class Lion : Carnivore
{
public override void Eat(Herbivore h)
{
// Eat Wildebeest
Console.WriteLine(this.GetType().Name +
" eats " + h.GetType().Name);
}
}
// "ProductA2"
class Bison : Herbivore
{
}
// "ProductB2"
class Wolf : Carnivore
{
public override void Eat(Herbivore h)
{
// Eat Bison
Console.WriteLine(this.GetType().Name +
" eats " + h.GetType().Name);
}
}
// "Client"
class AnimalWorld
{
private Herbivore herbivore;
private Carnivore carnivore;
// Constructor
public AnimalWorld(ContinentFactory factory)
{
carnivore = factory.CreateCarnivore();
herbivore = factory.CreateHerbivore();
}
public void RunFoodChain()
{
carnivore.Eat(herbivore);
}
}
}
namespace DoFactory.GangOfFour.Abstract.RealWorld
{
// MainApp test application
class MainApp
{
public static void Main()
{
// Create and run the Africa animal world
ContinentFactory africa = new AfricaFactory();
AnimalWorld world = new AnimalWorld(africa);
world.RunFoodChain();
// Create and run the America animal world
ContinentFactory america = new AmericaFactory();
world = new AnimalWorld(america);
world.RunFoodChain();
// Wait for user input
Console.Read();
}
}
// "AbstractFactory"
abstract class ContinentFactory
{
public abstract Herbivore CreateHerbivore();
public abstract Carnivore CreateCarnivore();
}
// "ConcreteFactory1"
class AfricaFactory : ContinentFactory
{
public override Herbivore CreateHerbivore()
{
return new Wildebeest();
}
public override Carnivore CreateCarnivore()
{
return new Lion();
}
}
// "ConcreteFactory2"
class AmericaFactory : ContinentFactory
{
public override Herbivore CreateHerbivore()
{
return new Bison();
}
public override Carnivore CreateCarnivore()
{
return new Wolf();
}
}
// "AbstractProductA"
abstract class Herbivore
{
}
// "AbstractProductB"
abstract class Carnivore
{
public abstract void Eat(Herbivore h);
}
// "ProductA1"
class Wildebeest : Herbivore
{
}
// "ProductB1"
class Lion : Carnivore
{
public override void Eat(Herbivore h)
{
// Eat Wildebeest
Console.WriteLine(this.GetType().Name +
" eats " + h.GetType().Name);
}
}
// "ProductA2"
class Bison : Herbivore
{
}
// "ProductB2"
class Wolf : Carnivore
{
public override void Eat(Herbivore h)
{
// Eat Bison
Console.WriteLine(this.GetType().Name +
" eats " + h.GetType().Name);
}
}
// "Client"
class AnimalWorld
{
private Herbivore herbivore;
private Carnivore carnivore;
// Constructor
public AnimalWorld(ContinentFactory factory)
{
carnivore = factory.CreateCarnivore();
herbivore = factory.CreateHerbivore();
}
public void RunFoodChain()
{
carnivore.Eat(herbivore);
}
}
}
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