python:裝飾模式的一個實現

#!/usr/bin/env python# -*- coding: utf-8 -*-import syssys.path.append("..")import commonclass Component:    def __init__(self,data):        self.url = data["url"]        self.noteId = data["noteId"]        self.userId = data["userId"]        self.folderId = data["folderId"]            def execute(self):        passclass NoteComponent(Component):    def __init__(self,data,component=None):        self.component = component        Component.__init__(self, data)        def setComponent(self,component):        self.component = componentclass HtmlCatcher(NoteComponent):    def execute(self):        if self.component != None:            self.component.execute()        print self.__class__.__name__class ImageCatcher(NoteComponent):    def execute(self):        if self.component != None:            self.component.execute()        print self.__class__.__name__    class shareNoteComponet(NoteComponent):    def execute(self):        if self.component != None:            self.component.execute()        print self.__class__.__name__    def process(message):    component = None    if message['TYPE'] & common.CATCH_PAGE:        component = HtmlCatcher(message["DATA"])            if message['TYPE'] & common.CATCH_IMAGE:        component1 = ImageCatcher(message["DATA"])        component1.setComponent(component)        component = component1            if message['TYPE'] & common.SAVE_SHARED:        component1 = shareNoteComponet(message["DATA"])        component1.setComponent(component)        component = component1        component.execute()        if __name__ == "__main__":    message = {            #"TYPE":common.CATCH_PAGE,            #"TYPE":common.CATCH_IMAGE | common.SAVE_SHARED,            "TYPE":common.CATCH_PAGE | common.SAVE_SHARED | common.CATCH_IMAGE,            "DATA":                {                    "url":"http://www.baidu.com",                    "noteId":100,                    "userId":100,                    "folderId":100,                }    }        process(message)