    from MiscUtils.Configurable import Configurable, NoDefault

    class ConfigurableForServerSidePath(Configurable):

        """
        This is a version of `MiscUtils.Configurable.Configurable`
        that provides a customized `setting` method for classes which
        have a `serverSidePath` method. If a setting's name ends with
        ``Filename`` or ``Dir``, its value is passed through
        `serverSidePath` before being returned.

        In other words, relative filenames and directory names are
        expanded with the location of the object, NOT the current
        directory.

        Application and AppServer are two well known users of this
        mix-in. Any class that has a `serverSidePath` method and a
        `Configurable` base class, should inherit this class instead.

        This is used with for MakeAppWorkDir, which changes the
        serverSidePath.
        """

        def setting(self, name, default=NoDefault):
            """
            Returns the setting, filtered by
            self.serverSidePath(), if the name ends with
            ``Filename`` or ``Dir``.
            """

            value = Configurable.setting(self, name, default)
            if name[-8:]=='Filename' or name[-3:]=='Dir':
                value = self.serverSidePath(value)
            return value