code: def matches(self, stream):
          
  
          if self.match_type != stream.stream_type:
              return False
  
          if self.match_id is not None:
              return self.match_id == stream.stream_id
  
          if self.match_spec == DataStreamSelector.MatchUserOnly:
              return not stream.system
          elif self.match_spec == DataStreamSelector.MatchSystemOnly:
              return stream.system
          elif self.match_spec == DataStreamSelector.MatchUserAndBreaks:
              return (not stream.system) or (stream.system and (stream.stream_id in DataStream.KnownBreakStreams))
  
          # The other case is that match_spec is MatchCombined, which matches everything
          # regardless of system of user flag
          return True
docs: Check if this selector matches the given stream
  
          Args:
              stream (DataStream): The stream to check
  
          Returns:
              bool: True if this selector matches the stream