def register_path(self, path, modified_time=None):
        """
        Registers given path.

        :param path: Path name.
        :type path: unicode
        :param modified_time: Custom modified time.
        :type modified_time: int or float
        :return: Method success.
        :rtype: bool
        """

        if not foundations.common.path_exists(path):
            raise foundations.exceptions.PathExistsError("{0} | '{1}' path doesn't exists!".format(
                self.__class__.__name__, path))

        if path in self:
            raise umbra.exceptions.PathRegistrationError("{0} | '{1}' path is already registered!".format(
                self.__class__.__name__, path))

        self.__paths[path] = (self.get_path_modified_time(
            path) if modified_time is None else modified_time, os.path.isfile(path))
        return True