设计模式之状态模式

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# -*- coding: gbk -*-# -*- coding: utf-8 -*-"""@author: Edgar这是状态模式的一个应用场景。（具体故事情节请见《设计模式之禅》）"""class Context(object):    def __init__(self):        self.open_State = Open_State(self)        self.closeState = CloseState(self)        self.runState = RunState(self)        self.stopState = StopState(self)            def setState(self, state):        self.state = state        self.state.setContext(self)            def getState(self):        return self.state        def showState(func):        def _showState(obj):                       print '当前状态为: {0}'.format(obj.state.__class__.__name__)            return func(obj)        return _showState            @showState    def open_(self):        self.state.open_()        @showState        def close(self):        self.state.close()        @showState        def run(self):        self.state.run()        @showState    def stop(self):        self.state.stop()        class AbsState(object):    def __init__(self, context):        self.context = context            def setContext(self, context):        self.context = context                def open_(self):        pass        def close(self):        pass        def run(self):        pass        def stop(self):        pass    class Open_State(AbsState):    def open_(self):        print '电梯运行'            def close(self):        self.context.setState(self.context.closeState)        self.context.getState().close()            def run(self):        print '当前状态不能运行'            def stop(self):        print '当前状态不能停止'        class CloseState(AbsState):    def open_(self):        self.context.setState(self.context.open_State)        self.context.getState().open_()            def close(self):        print '电梯关门'            def run(self):        self.context.setState(self.context.runState)        self.context.getState().run()            def stop(self):        self.context.setState(self.context.stopState)        self.context.getState().stop()        class RunState(AbsState):    def open_(self):        print '当前状态不能开门'            def close(self):        print '当前状态不能关门'            def run(self):        print '电梯上下运行'            def stop(self):        self.context.setState(self.context.stopState)        self.context.getState().stop()        class StopState(AbsState):    def open_(self):        self.context.setState(self.context.open_State)        self.context.getState().open_()            def close(self):        print '当前状态不能关门'            def run(self):        self.context.setState(self.context.runState)        self.context.getState().run()            def stop(self):        self.context.setState(self.context.stopState)        self.context.getState().stop()                if __name__ == '__main__':    context = Context()    context.setState(context.closeState)    context.open_()    context.stop()    context.close()
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