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
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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()
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类图:
实例:
我们再来看一个简单的Adapter例子
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#encoding=utf-8
#
#by panda
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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