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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}
正文完