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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def ParseDownloadsRow( self, parser_mediator, query, row, **unused_kwargs):
 """Parses a downloads row. Args: parser_mediator (ParserMediator):
 mediates interactions between parsers and other components, such as storage and dfvfs. query (str):
 query that created the row. row (sqlite3.Row):
 row. """

    query_hash = hash(query)

    event_data = FirefoxDownloadEventData()
    event_data.full_path = self._GetRowValue(query_hash, row, 'target')
    event_data.mime_type = self._GetRowValue(query_hash, row, 'mimeType')
    event_data.name = self._GetRowValue(query_hash, row, 'name')
    event_data.offset = self._GetRowValue(query_hash, row, 'id')
    event_data.query = query
    event_data.received_bytes = self._GetRowValue(query_hash, row, 'currBytes')
    event_data.referrer = self._GetRowValue(query_hash, row, 'referrer')
    event_data.temporary_location = self._GetRowValue(
        query_hash, row, 'tempPath')
    event_data.total_bytes = self._GetRowValue(query_hash, row, 'maxBytes')
    event_data.url = self._GetRowValue(query_hash, row, 'source')

    timestamp = self._GetRowValue(query_hash, row, 'startTime')
    if timestamp:
      date_time = dfdatetime_posix_time.PosixTimeInMicroseconds(
          timestamp=timestamp)
      event = time_events.DateTimeValuesEvent(
          date_time, definitions.TIME_DESCRIPTION_START)
      parser_mediator.ProduceEventWithEventData(event, event_data)

    timestamp = self._GetRowValue(query_hash, row, 'endTime')
    if timestamp:
      date_time = dfdatetime_posix_time.PosixTimeInMicroseconds(
          timestamp=timestamp)
      event = time_events.DateTimeValuesEvent(
          date_time, definitions.TIME_DESCRIPTION_END)
      parser_mediator.ProduceEventWithEventData(event, event_data)