def METHOD_NAME(self, snapshot_object):
    """ Get the structure from the filesystem."""
    structure_data = {}
    json_test_dir = get_test_json_dir()
    snapshot_source = get_field_value(snapshot_object, "source")
    file_name = '%s.json' % snapshot_source if snapshot_source and not \
        snapshot_source.endswith('.json') else snapshot_source
    custom_source = '%s/../%s' % (json_test_dir, file_name)
    logger.info('%s structure file is %s', Snapshot.LOGPREFIX, custom_source)
    if exists_file(custom_source):
        structure_data = json_from_file(custom_source)
    return structure_data