Python设计模式编程中Adapter适配器模式的使用实例

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将一个类的接口转换成客户希望的另外一个接口。使得原本由于接口不兼容而不能一起工作的那些类可以一起工作。
应用场景:希望复用一些现存的类,但是接口又与复用环境要求不一致。

模式特点:将一个类的接口转换成为客户希望的另外一个接口。

分类:类适配器(通过多重继承)、对象适配器。

来通过例子说明,下面是用户通过适配器使用一个类的方法


    class Target:
     def Request():
      print "common request."

    class Adaptee(Target):
     def SpecificRequest(self):
      print "specific request."

    class Adapter(Target):
     def __init__(self,ada):
      self.adaptee = ada
     def Request(self):
      self.adaptee.SpecificRequest()

    if __name__ == "__main__":
     adaptee = Adaptee()
     adapter = Adapter(adaptee)
     adapter.Request()

类图:

201632112018391.jpg \(669×296\)

实例:
我们再来看一个简单的Adapter例子


    #encoding=utf-8 
    # 
    #by panda 
    #适配器模式 


    def printInfo(info): 
     print unicode(info, 'utf-8').encode('gbk') 

    #球员类 
    class Player(): 
     name = '' 
     def __init__(self,name): 
      self.name = name 

     def Attack(self,name): 
      pass 

     def Defense(self): 
      pass 

    #前锋 
    class Forwards(Player): 
     def __init__(self,name): 
      Player.__init__(self,name) 

     def Attack(self): 
      printInfo("前锋%s 进攻" % self.name) 

     def Defense(self,name): 
      printInfo("前锋%s 防守" % self.name) 

    #中锋(目标类) 
    class Center(Player): 
     def __init__(self,name): 
      Player.__init__(self,name) 

     def Attack(self): 
      printInfo("中锋%s 进攻" % self.name) 

     def Defense(self): 
      printInfo("中锋%s 防守" % self.name) 

    #后卫 
    class Guards(Player): 
     def __init__(self,name): 
      Player.__init__(self,name) 

     def Attack(self): 
      printInfo("后卫%s 进攻" % self.name) 

     def Defense(self): 
      printInfo("后卫%s 防守" % self.name) 

    #外籍中锋(待适配类) 
    #中锋 
    class ForeignCenter(Player): 
     name = '' 
     def __init__(self,name): 
      Player.__init__(self,name) 

     def ForeignAttack(self): 
      printInfo("外籍中锋%s 进攻" % self.name) 

     def ForeignDefense(self): 
      printInfo("外籍中锋%s 防守" % self.name) 


    #翻译(适配类) 
    class Translator(Player): 
     foreignCenter = None 
     def __init__(self,name): 
      self.foreignCenter = ForeignCenter(name) 

     def Attack(self): 
      self.foreignCenter.ForeignAttack() 

     def Defense(self): 
      self.foreignCenter.ForeignDefense() 


    def clientUI(): 
     b = Forwards('巴蒂尔') 
     m = Guards('麦克格雷迪') 
     ym = Translator('姚明') 

     b.Attack() 
     m.Defense() 
     ym.Attack() 
     ym.Defense() 
     return 

    if __name__ == '__main__': 
     clientUI(); 

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