import xml sax saxutils class XmlShadow def __init__ self attribute_na

  • Anonymous
  • Python
  • 23 Aug 2014 
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import xml.sax.saxutils





class XmlShadow:



    def __init__(self, attribute_name):

        self.attribute_name = attribute_name





    def __get__(self, instance, owner=None):

        return xml.sax.saxutils.escape(

                            getattr(instance, self.attribute_name))





class Product:



    __slots__ = ("__name", "__description", "__price")



    name_as_xml = XmlShadow("name")

    description_as_xml = XmlShadow("description")



    def __init__(self, name, description, price):

        self.__name = name

        self.description = description

        self.price = price





    @property

    def name(self):

        return self.__name





    @property

    def description(self):

        return self.__description





    @description.setter

    def description(self, description):

        self.__description = description





    @property

    def price(self):

        return self.__price





    @price.setter

    def price(self, price):

        self.__price = price





class CachedXmlShadow:



    def __init__(self, attribute_name):

        self.attribute_name = attribute_name

        self.cache = {}





    def __get__(self, instance, owner=None):

        xml_text = self.cache.get(id(instance))

        if xml_text is not None:

            return xml_text

        return self.cache.setdefault(id(instance),

                xml.sax.saxutils.escape(

                            getattr(instance, self.attribute_name)))





class CachedProduct:



    __slots__ = ("__name", "__description", "__price")



    name_as_xml = CachedXmlShadow("name")

    description_as_xml = CachedXmlShadow("description")



    def __init__(self, name, description, price):

        self.__name = name

        self.description = description

        self.price = price





    @property

    def name(self):

        return self.__name





    @property

    def description(self):

        return self.__description





    @description.setter

    def description(self, description):

        self.__description = description





    @property

    def price(self):

        return self.__price





    @price.setter

    def price(self, price):

        self.__price = price









if __name__ == "__main__":

    import doctest

    doctest.testmod()
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