def get_file_list(self):
        """Retrieve the list of absolute paths to all the files in this data source.

        Returns:
             List[str] List of absolute paths.
        """
        if os.path.isdir(self.root_path):
            return [os.path.join(self.root_path, f) for f in os.listdir(self.root_path)
                    if os.path.isfile(os.path.join(self.root_path, f))]
        else:
            return [self.root_path]
Retrieve the list of absolute paths to all the files in this data source.

        Returns:
             List[str] List of absolute paths.