def query_samples(self, filter_expr=None, orderby=None, limit=None):
if limit == 0:
return []
query_filter = {}
orderby_filter = [("timestamp", pymongo.DESCENDING)]
transformer = pymongo_utils.QueryTransformer()
if orderby is not None:
orderby_filter = transformer.transform_orderby(orderby)
if filter_expr is not None:
query_filter = transformer.transform_filter(filter_expr)
return self._retrieve_samples(query_filter, orderby_filter, limit)
def _retrieve_data(self, filter_expr, orderby, limit, model):
if limit == 0:
return []
query_filter = {}
orderby_filter = [("timestamp", pymongo.DESCENDING)]
transformer = pymongo_utils.QueryTransformer()
if orderby is not None:
orderby_filter = transformer.transform_orderby(orderby)
if filter_expr is not None:
query_filter = transformer.transform_filter(filter_expr)
retrieve = {models.Alarm: self._retrieve_alarms,
models.AlarmChange: self._retrieve_alarm_changes}
return retrieve[model](query_filter, orderby_filter, limit)