19-代理器模式.php

<?php

declare(strict_types=1);

/*
 * This file is modified from `xiaohuangniu/26`.
 *
 * @see https://github.com/xiaohuangniu/26
 */

header('Content-type: text/html; charset=utf-8');

/**
 * 接口 - 鞋.
 */
interface ShoesInterface
{
    public function product();
}

/**
 * 创建 - 运动鞋模型.
 */
class ShoesSport implements ShoesInterface
{
    public function product()
    {
        echo '生产一双球鞋'.PHP_EOL;
    }
}

/**
 * 代理器.
 */
class Proxy
{
    private $_shoes; // 鞋的模型对象

    private $_shoesType; // 生产哪种鞋子

    public function __construct($shoesType)
    {
        $this->_shoesType = $shoesType;
    }

    /**
     * 生产.
     */
    public function product()
    {
        switch ($this->_shoesType) {
            case 'sport':
                echo '我可以偷工减料';
                $this->_shoes = new ShoesSport();
                break;
            default:
                throw new Exception('类型不正确', 404);
                break;
        }
        $this->_shoes->product();
    }
}

echo '未加代理之前：'.PHP_EOL;
// 生产运动鞋
$shoesSport = new ShoesSport();
$shoesSport->product();

echo '加代理：'.PHP_EOL;
// 把运动鞋产品线外包给代工厂
$proxy = new Proxy('sport');
// 代工厂生产运动鞋
$proxy->product();