Python设计模式之装饰模式实例详解

#!/usr/bin/env python
# -*- coding:utf-8 -*-
__author__ = 'Andy'
"""
大话设计模式
设计模式――装饰模式
装饰模式(Decorator Pattern):动态的给一个对象添加一些额外的职责,就增加功能来说,装饰模式比生成子类更为灵活.
特点: 有效的把类的核心职责和装饰功能区分开,而且可以去除相关类中重复的装饰逻辑
"""
# 定义对象接口
class Person(object):
  def __init__(self,name):
    self.name = name
  def show(self):
    print "装扮的%s"%self.name
#装饰类
class Finery(Person):
  def __init__(self):
    pass
  def Decorate(self,componet):
    self.componet = componet
  def show(self):
    if self.componet != None:
      self.componet.show()
#装扮――T恤
class TShirts(Finery):
  def __init__(self):
    pass
  def show(self):
    print 'T恤'
    self.componet.show()
#装扮――大裤衩
class BigTrouser(Finery):
  def __init__(self):
    pass
  def show(self):
    print '大裤衩'
    self.componet.show()
# 装扮――人字拖
class FlipFlops(Finery):
  def __init__(self):
    pass
  def show(self):
    print '人字拖'
    self.componet.show()
if __name__ == '__main__':
  p = Person('Andy')
  ff = FlipFlops()
  bt = BigTrouser()
  ts = TShirts()
  ff.Decorate(p)
  bt.Decorate(ff)
  ts.Decorate(bt)
  ts.show()