17-装饰器模式.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';
    }
}

/**
 * 抽象 - 装饰器类.
 */
abstract class Decorator implements ShoesInterface
{
    protected $shoes; // 模型的实例

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

    // 生成方法
    public function product()
    {
        $this->shoes->product();
    }

    //定义装饰操作
    abstract public function decorate();
}

/**
 * 创建 - 贴标装饰器.
 */
class DecoratorBrand extends Decorator
{
    public $_value; // 标签名

    /**
     * 生成操作.
     */
    public function product()
    {
        $this->shoes->product();
        $this->decorate();
    }

    /**
     * 贴标操作.
     */
    public function decorate()
    {
        echo "贴上{$this->_value}标志 ".PHP_EOL;
    }
}

echo '未加装饰器之前：';
// 生产运动鞋
$shoesSport = new ShoesSport();
$shoesSport->product();
echo PHP_EOL;

echo '加贴标装饰器：';
// 初始化一个贴商标适配器
$DecoratorBrand = new DecoratorBrand($shoesSport);
// 写入标签名
$DecoratorBrand->_value = 'nike';
// 生产nike牌运动鞋
$DecoratorBrand->product();