设计模式之适配器模式

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在设计模式中，适配器模式（英语：adapter pattern）有时候也称包装样式或者包装(wrapper)。将一个类的接口转接成用户所期待的。一个适配使得因接口不兼容而不能在一起工作的类工作在一起，做法是将类别自己的接口包裹在一个已存在的类中。

结构图

适配器模式分为类适配器模式和对象适配器模式。

类适配器模式结构图

c++代码示例：

#include<iostream>using namespace std;// "ITarget"class Target{public:// Methodsvirtual void Request() {};};// "Adaptee"class Adaptee{public:// Methodsvoid SpecificRequest(){cout<<"Called SpecificRequest()"<<endl;}};// "Adapter"class Adapter : public Adaptee, public Target{public:// Implements ITarget interfacevoid Request(){// Possibly do some data manipulation// and then call SpecificRequestthis->SpecificRequest();}};int main() {// Create adapter and place a requestTarget * t = newAdapter();t->Request();return 0;}

对象适配器结构图：

c++代码示例

#include<iostream>using namespace std;// "ITarget"class Target{public:// Methodsvirtual void Request() {};};// "Adaptee"class Adaptee{public:// Methodsvoid SpecificRequest(){cout<<"Called SpecificRequest()"<<endl;}};// "Adapter"class Adapter : public Target{private:Adaptee *adaptee;public:Adapter(){adaptee = new Adaptee();}// Implements ITarget interfacevoid Request(){// Possibly do some data manipulation// and then call SpecificRequestadaptee->SpecificRequest();}};int main() {// Create adapter and place a requestTarget * t = newAdapter();t->Request();return 0;}

缺省适配器c++代码实例：

#include<iostream>using namespace std;class Target {public:virtual void f1() {};virtual void f2() {};virtual void f3() {};};class DefaultAdapter : public Target{public:void f1() {}void f2() {}void f3() {}};class MyInteresting :public DefaultAdapter{public:void f3() {cout<<"呵呵，我就对f3()方法感兴趣，别的不管了！"<<endl;}};int main() {// Create adapter and place a requestTarget * t = newMyInteresting();t->f3();return 0;}

拓展连接：

http://www.cnblogs.com/qianxudetianxia/archive/2012/02/27/2010965.html
http://liuling123.com/2013/04/object-adapter.html

http://liuling123.com/2013/04/design-pattern-adapter.html

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