AbstractFactory(抽象工厂模式)

AbstractFactory(抽象工厂模式)

　　有些情况下我们需要根据不同的选择逻辑提供不同的构造工厂，而对于多个工厂而言需要一个统一的抽象

<?php

class Config {
    public static $factory = 1;
}

interface Product {
    public function getName();
}

abstract class AbstractFactory {

    public static function getFactory() {
        switch (Config::$factory) {
            case 1:
                return new FirstFactory();
            case 2:
                return new SecondFactory();
        }
        throw new Exception('Bad config');
    }

    abstract public function getProduct();
}

class FirstFactory extends AbstractFactory {
    public function getProduct() {
        return new FirstProduct();
    }
}
class FirstProduct implements Product {
    public function getName() {
        return 'The product from the first factory';
    }
}

class SecondFactory extends AbstractFactory {
    public function getProduct() {
        return new SecondProduct();
    }
}
class SecondProduct implements Product {
    public function getName() {
        return 'The product from second factory';
    }
}

$firstProduct = AbstractFactory::getFactory()->getProduct();
Config::$factory = 2;
$secondProduct = AbstractFactory::getFactory()->getProduct();

print_r($firstProduct->getName());
// The first product from the first factory
print_r($secondProduct->getName());
// Second product from second factory