Python设计模式(11)-状态模式

# coding=utf-8

# *状态模式：一个方法的判断逻辑太长，就不容易修改。方法过长，其本质就是，
# * 就是本类在不同条件下的状态转移。状态模式，就是将这些判断分开到各个能
# * 表示当前状态的独立类中


class State:
    def persion_state(self):
        pass


class SomeDay:
    def __init__(self):
        self.time = 8
        self.current = Breakfast()

    def set_state(self, temp):
        self.current = temp

    def persion_state(self):
        self.current.persion_state(self)


class Breakfast(State):
    def persion_state(self, some_day):
        if (some_day.time < 8):
            print "吃早饭"
        else:
            some_day.set_state(Lunch())
            some_day.persion_state()


class Lunch(State):
    def persion_state(self, some_day):
        if (some_day.time < 12):
            print "吃午饭"
        else:
            print "吃晚饭"


if __name__ == "__main__":
    some_day = SomeDay()
    some_day.time = 11
    some_day.persion_state()
    some_day.time = 15
    some_day.persion_state()