简介

工厂办法中，每一个具体工厂类都对应创立一个具体产品类，所有具体工厂类都实现形象工厂，所有具体产品类都实现形象产品。

形象工厂定义了创立形象产品的办法签名，具体工厂类各自实现各自逻辑，来创立具体的产品。

角色

  • 形象工厂 Abstract Factory

    定义创立产品的办法签名，即Factory Method

  • 形象产品 Abstract Product

    定义产品的根本属性

  • 具体工厂 Concrete Factory

    实现自形象工厂，并实现 Factory Method，实现如何创立具体产品。

  • 具体产品 Concrete Product

    实现具体产品根本属性

类图

如图所示，Dialog形象工厂能够创立Button形象产品，WindowsDialog和WebDialog都是具体工厂，负责创立WindownsButton和HTMLButton。

代码

abstract class Creator{    abstract public function factoryMethod(): Product;    public function someOperation(): string    {        $product = $this->factoryMethod();        $result = "Creator: The same creator's code has just worked with " . $product->operation();        return $result;    }}class ConcreteCreator1 extends Creator{    public function factoryMethod(): Product    {        return new ConcreteProduct1();    }}class ConcreteCreator2 extends Creator{    public function factoryMethod(): Product    {        return new ConcreteProduct2();    }}interface Product{    public function operation(): string;}class ConcreteProduct1 implements Product{    public function operation(): string    {        return "{Result of the ConcreteProduct1}";    }}class ConcreteProduct2 implements Product{    public function operation(): string    {        return "{Result of the ConcreteProduct2}";    }}function clientCode(Creator $creator){    echo "Client: I'm not aware of the creator's class, but it still works.\n" . $creator->someOperation() . "\n";}echo "App: Launched with the ConcreteCreator1.\n";clientCode(new ConcreteCreator1());echo "App: Launched with the ConcreteCreator2.\n";clientCode(new ConcreteCreator2());

output

App: Launched with the ConcreteCreator1.Client: I'm not aware of the creator's class, but it still works.Creator: The same creator's code has just worked with {Result of the ConcreteProduct1}App: Launched with the ConcreteCreator2.Client: I'm not aware of the creator's class, but it still works.Creator: The same creator's code has just worked with {Result of the ConcreteProduct2}