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能够相互合作
角色
-
Client 接口 / Target 目标接口
用户使用的接口
-
Adaptee
被适配的对象,原有方法不能直接给 client 使用
-
Adapter
适配器,实现 Target 接口,将 Adaptee 的方法改造成兼容 client 的形式,供 client使用
类图
图示,Adapter 持有 Service 对象实例,method 方法实现自 Client Interface,使 client 可以调用,method 内部逻辑则将 client 的入参转换后交给 service 处理
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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标签:Adapter,Target,适配器,Adaptee,Client,设计模式,adaptee,target From: https://www.cnblogs.com/caipi/p/17682038.html