关于后端:结构型设计模式适配器-Adapter

结构型设计模式-适配器 Adapter

date: April 13, 2021
slug: design-pattern-adapter
status: Published
tags: 设计模式
type: Page

简介

适配器模式是一种结构型设计模式， 它能使接口不兼容的对象可能相互合作

角色

• Client 接口 / Target 指标接口

  用户应用的接口

• Adaptee

  被适配的对象，原有办法不能间接给 client 应用

• Adapter

  适配器，实现 Target 接口，将 Adaptee 的办法革新成兼容 client 的模式，供 client应用

类图

图示，Adapter 持有 Service 对象实例，method 办法实现自 Client Interface，使 client 能够调用，method 外部逻辑则将 client 的入参转换后交给 service 解决

代码

class Target{    public function request(): string    {        return "Target: The default target's behavior.";    }}class Adaptee{    public function specificRequest(): string    {        return ".eetpadA eht fo roivaheb laicepS";    }}class Adapter extends Target{    private $adaptee;    public function __construct(Adaptee $adaptee)    {        $this->adaptee = $adaptee;    }    public function request(): string    {        return "Adapter: (TRANSLATED) " . strrev($this->adaptee->specificRequest());    }}function clientCode(Target $target){    echo $target->request();}echo "Client: I can work just fine with the Target objects:\n";$target = new Target();clientCode($target);$adaptee = new Adaptee();echo "Client: The Adaptee class has a weird interface. See, I don't understand it:\n";echo "Adaptee: " . $adaptee->specificRequest();echo "Client: But I can work with it via the Adapter:\n";$adapter = new Adapter($adaptee);clientCode($adapter);

output:

Client: I can work just fine with the Target objects:Target: The default target's behavior.Client: The Adaptee class has a weird interface. See, I don't understand it:Adaptee: .eetpadA eht fo roivaheb laicepSClient: But I can work with it via the Adapter:Adapter: (TRANSLATED) Special behavior of the Adaptee.

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