code: def ParseFileObject(self, parser_mediator, file_object):
      
      # Trivial JSON format check: first character must be an open brace.
      if file_object.read(1) != b'{':
        raise errors.UnableToParseFile(
            'is not a valid JSON file, missing opening brace.')
  
      file_object.seek(0, os.SEEK_SET)
  
      file_entry = parser_mediator.GetFileEntry()
  
      file_system = file_entry.GetFileSystem()
  
      json_file_path = parser_mediator.GetDisplayName()
      split_path = file_system.SplitPath(json_file_path)
      try:
        if 'containers' in split_path:
          if 'config.json' in split_path:
            self._ParseContainerConfigJSON(parser_mediator, file_object)
          if json_file_path.endswith('-json.log'):
            self._ParseContainerLogJSON(parser_mediator, file_object)
        elif 'graph' in split_path:
          if 'json' in split_path:
            self._ParseLayerConfigJSON(parser_mediator, file_object)
      except ValueError as exception:
        if exception == 'No JSON object could be decoded':
          raise errors.UnableToParseFile(exception)
        else:
          raise
docs: Parses various Docker configuration and log files in JSON format.
  
      This methods checks whether the file_object points to a docker JSON config
      or log file, and calls the corresponding _Parse* function to generate
      Events.
  
      Args:
        parser_mediator (ParserMediator): mediates interactions between parsers
            and other components, such as storage and dfvfs.
        file_object (dfvfs.FileIO): a file-like object.
  
      Raises:
        UnableToParseFile: when the file cannot be parsed.
        ValueError: if the JSON file cannot be decoded.