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PHP Adapter Pattern Object Adaptation Code Analysis

Mar 15, 2017 am 09:49 AM

PHPAdapter patternObjectAdaptation code analysis

<?php
// 适配器模式-对象适配

/**
 * 需要被适配的类
 * 需求:给 Source 新增一个新的方法但又不修改 Source 的源代码
 */
class Source
{
	public function action() {
		echo &#39;call action&#39;, &#39;<br/>&#39;;
	}
}

interface Targetable
{
	/**
	 * Source 类中同名的方法,
	 * 适配器中不需要使用的方法可以不在此接口中定义
	 */
	function action();
	
	/**
	 * 需要给 Source 类新增的方法
	 */
	function action2();
}

/**
 * 适配器类
 * 相对于 类适配 更加灵活
 */
class Adapter implements Targetable
{
	/**
	 * 不是继承 Source 类, 而是持有 Source 类的实例
	 */
	private $sou = null;
	
	public function construct(Source $s) {
		$this->sou = $s;
	}
	
	public function action() {
		$this->sou->action();
	}
	
	public function action2() {
		echo &#39;call <b>action2</b>&#39;, &#39;<br/>&#39;;
	}
}

// test code
$s = new Source();
$ad = new Adapter($s);

$ad->action();
$ad->action2();
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