'Returns the ResultCollection for the flow with a given flow_id.
Args:
flow_id: The id of the flow, a RDFURN of the form aff4:/flows/F:123456.
token: A data store token.
Returns:
The collection containing the results for the flow identified by the id.'

@classmethod
def ResultCollectionForFID(cls, flow_id, token=None):

    return sequential_collection.GeneralIndexedCollection(flow_id.Add(RESULTS_SUFFIX), token=token)
