<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _GetIdentifierFromPath(self, parser_mediator):
 """Extracts a container or a graph ID from a JSON file's path. Args: parser_mediator (ParserMediator):
 mediates interactions between parsers and other components, such as storage and dfvfs. Returns: str: container or graph identifier. """

    file_entry = parser_mediator.GetFileEntry()
    path = file_entry.path_spec.location
    file_system = file_entry.GetFileSystem()
    path_segments = file_system.SplitPath(path)
    return path_segments[-2]