把对某些相似的类的操作转化为一个统一的“接口”(这里是比喻的说话)--适配器,或者比喻为一个“界面”,统一或屏蔽了那些类的细节。适配器模式还构造了一种“机制”,使“适配”的类可以很容易的增减,而不用修改与适配器交互的代码,符合“减少代码间耦合”的设计原则
<?php /* * 适配器模式 */ abstract class Toy { public abstract function openMouth(); public abstract function closeMouth(); } class Dog extends Toy { public function openMouth() { echo "Dog open Mouth\n"; } public function closeMouth() { echo "Dog close Mouth\n"; } } class Cat extends Toy { public function openMouth() { echo "Cat open Mouth\n"; } public function closeMouth() { echo "Cat close Mouth\n"; } } //目标角色:红枣遥控公司 interface RedTarget { public function doMouthOpen(); public function doMouthClose(); } //目标角色:绿枣遥控公司及 interface GreenTarget { public function operateMouth($type = 0); } //类适配器角色:红枣遥控公司 class RedAdapter implements RedTarget { private $adaptee; function __construct(Toy $adaptee) { $this->adaptee = $adaptee; } //委派调用Adaptee的sampleMethod1方法 public function doMouthOpen() { $this->adaptee->openMouth(); } public function doMouthClose() { $this->adaptee->closeMouth(); } } //类适配器角色:绿枣遥控公司 class GreenAdapter implements GreenTarget { private $adaptee; function __construct(Toy $adaptee) { $this->adaptee = $adaptee; } //委派调用Adaptee:GreenTarget的operateMouth方法 public function operateMouth($type = 0) { if ($type) { $this->adaptee->openMouth(); } else { $this->adaptee->closeMouth(); } } } class testDriver //客户端,客户想要那种就实现那种 { public function run() { //实例化一只狗玩具 $adaptee_dog = new Dog(); echo "没有适配器的普通模式"; $adaptee_dog->openMouth(); $adaptee_dog->closeMouth(); echo "给狗套上红枣适配器\n"; $adapter_red = new RedAdapter($adaptee_dog); //张嘴 $adapter_red->doMouthOpen(); //闭嘴 $adapter_red->doMouthClose(); echo "给狗套上绿枣适配器\n"; $adapter_green = new GreenAdapter($adaptee_dog); //张嘴 $adapter_green->operateMouth(1); //闭嘴 $adapter_green->operateMouth(0); } } $test = new testDriver(); $test->run();
适配器模式将现有接口转化为客户类所期望的接口,实现了对现有类的复用,它是一种使用频率非常高的设计模式
相关推荐:
以上是php设计模式之适配器模式详解的详细内容。更多信息请关注PHP中文网其他相关文章!