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 <time datetime="2021-06-01T16:12:55+09:00">2021-06-01</time> by Dennis in 
&nbsp;<a href="/categories/tech" rel="category tag">tech</a>


&nbsp;<a href="/tags/java" rel="tag">java</a>, <a href="/tags/design-pattern" rel="tag">Design Pattern</a>


 </header>
 (Java 디자인 패턴 스터디 모집 중 : <a href="https://github.com/bluedskim/javaDesignPatterns">https://github.com/bluedskim/javaDesignPatterns</a>)
<h2 id="adapter적응-패턴">Adapter(적응) 패턴</h2>
<img src="https://static.spacecrafted.com/b849f747e16744a5be3537c67cbb5770/i/f4d8c0d7559a4f02861ae4d67e55ceb2/1/GCuCv726gZycFxatRCb7iU/Adaptation.jpg" alt="숲속의 곰이 북극에 적응하기" title="숲속의 곰이 북극에 적응하기">
(출처:<a href="https://educationinaction.org/water-rocks-vocabulary/adaptation">https://educationinaction.org/water-rocks-vocabulary/adaptation</a>)
<h2 id="해결하려는-문제">해결하려는 문제</h2>
<ol>
<li>인터페이스의 불일치 해결.</li>
</ol>
<h2 id="용도목적">용도/목적</h2>
<ol>
<li>구조적Structural 패턴</li>
<li>어떤 인터페이스를 다른 목적의 인터페이스로 만드는 패턴.</li>
<li>클라이언트 소스 수정이 불가능한 경우 유용하다.</li>
</ol>
<h2 id="구성요소">구성요소</h2>
<ol>
<li>adapter(wrapper) : adaptee의 interface를 클라이언트가 원하는 target의 인터페이스로 변경하는 객체</li>
<li>adaptee : 변경대상이 되는 객체</li>
<li>target : 클라이언트가 원하는 인터페이스를 가지고 있는 객체</li>
<li>클라이언트 : target으로 변경된 adaptee를 사용하는 객체</li>
</ol>
<h2 id="고려사항">고려사항</h2>
다른 유사한 패턴과 비교해보자 <a href="https://en.wikipedia.org/wiki/Adapter_pattern#Usage">https://en.wikipedia.org/wiki/Adapter_pattern#Usage</a>
<ol>
<li>Decorator : 원래의 소스를 감싸는 방식으로 인터페이스에 동적으로 기능을 추가한다.</li>
<li>Delegation : 상속을 통한 조합</li>
<li>Facade : 단순화된 인터페이스 제공</li>
</ol>
<h2 id="클래스-다이어그램">클래스 다이어그램</h2>
<img src="https://www.plantuml.com/plantuml/png/hLFBIWCn55qtNn4AqkcYC_iYOi551Gi5wmTa9hUJw2GPaaoXgA3GdOAu5DIrImKt_bAT_eFfaqvjYmMpkxdtd7Dp3ZaqbcYRYGGtA4ajQ3owVniDFhtXryttmrC-UAaYn3W532ArVIn0XA1DySeoHGr2bji4jl0m8DGrcBMfgGT1p2tBGZzI8WYJ3AYvu28u9pro18R7iasiev46TPKQy-MlZ_dW8xzx7hxVuZrAB7ZblZj-g-LJMi6LPhCkHDcjYxXqW2w909_mc5d9PTncIWA-HALJgrs9DKICw1YyAYhr5ASuCx0OTfVNoomj7cbrPiA_aCndfnnHGep1n-dkwbDaGr8zxk-kkQ3hg7bxdemZIpNlEGTnbqkIhBgK54fKsapbRKLM_t7f3XYxneL2Cbun9x5SJKHMjjs_ylrPDgW8dNGsBxDkUfRKaiXluskrWnMljurFdZo65DGGEWH9tOVz0G00" alt="Adapter 패턴(김동석)" title="Adapter 패턴(김동석)">
<h2 id="소스">소스</h2>
<ol>
<li>adapter : LightningToMicroUsbAdapter.java
<div>
<table><tbody><tr><td>
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</code></pre></td>
<td>
<pre><code data-lang="java">package net.dskim.desingpattern.adapter;

import lombok.extern.slf4j.Slf4j;

@Slf4j
public class LightningToMicroUsbAdapter implements MicroUsbPhone {
	private final LightningPhone lightningPhone;

	public LightningToMicroUsbAdapter(LightningPhone lightningPhone) {
		this.lightningPhone = lightningPhone;
	}

	@Override
	public void useMicroUsb() {
		log.info("MicroUsb connected");
		lightningPhone.useLightning();
	}

	@Override
	public String recharge() {
		return lightningPhone.recharge();
	}
}</code></pre></td></tr></tbody></table>
</div></li>
<li>adaptee : LightningPhone.java
<div>
<table><tbody><tr><td>
<pre><code>1
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</code></pre></td>
<td>
<pre><code data-lang="java">package net.dskim.desingpattern.adapter;

public interface LightningPhone {
	String recharge();
	void useLightning();
}</code></pre></td></tr></tbody></table>
</div></li>
<li>target : MicroUsbPhone.java
<div>
<table><tbody><tr><td>
<pre><code>1
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</code></pre></td>
<td>
<pre><code data-lang="java">package net.dskim.desingpattern.adapter;

public interface MicroUsbPhone {
	String recharge();
	void useMicroUsb();
}</code></pre></td></tr></tbody></table>
</div></li>
<li>클라이언트 : LightningToMicroUsbAdapterTest.java
<div>
<table><tbody><tr><td>
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</code></pre></td>
<td>
<pre><code data-lang="java">package net.dskim.desingpattern.adapter;

import static org.junit.jupiter.api.Assertions.assertEquals;

import org.junit.jupiter.api.Test;

import lombok.extern.slf4j.Slf4j;

@Slf4j
public class LightningToMicroUsbAdapterTest {
	// MicroUsbPhone 충전전용 메소드를 반드시 써야 한다고 가정한다.
	public String rechargeMicroUsbPhone(MicroUsbPhone microUsbPhone) {
		microUsbPhone.useMicroUsb();
		return microUsbPhone.recharge();
	}

	@Test
	public void lightningToMicroUsbAdapterTest() {
 Android android = new Android();
		String androidRechargeResult = rechargeMicroUsbPhone(android);
		log.info("androidRechargeResult={}", androidRechargeResult);
		assertEquals("Recharge finished", androidRechargeResult);

 Iphone iPhone = new Iphone();
		//rechargeMicroUsbPhone(iPhone); //iPhone에서 micro usb를 쓰려한다면 compile 에러 발생
		String iphoneWithMicroUsbRechargeResult = rechargeMicroUsbPhone(new LightningToMicroUsbAdapter(iPhone));
		log.info("iphoneWithMicroUsbRechargeResult={}", iphoneWithMicroUsbRechargeResult);
		assertEquals("Recharge finished", iphoneWithMicroUsbRechargeResult);
	}
}</code></pre></td></tr></tbody></table>
</div></li>
</ol>
<h2 id="참고">참고</h2>
<ul>
<li><a href="https://refactoring.guru/design-patterns/adapter">refactoring.guru : Adapter pattern</a></li>
<li><a href="https://en.wikipedia.org/wiki/Adapter_pattern">wikipedia : Adapter pattern</a></li>
<li><a href="https://www.baeldung.com/java-adapter-pattern#:~:text=An%20Adapter%20pattern%20acts%20as,compatible%20with%20the%20client's%20interface.">baeldung : The Adapter Pattern in Java</a></li>
</ul>


 

 
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(Java 디자인 패턴 스터디 모집 중 : https://github.com/bluedskim/javaDesignPatterns) Adapter(적응) 패턴 (출처:https://educationinaction.org/water-roc

Java 디자인 패턴-10.Adapter

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