def aggregate(self, data, sensordescription):
"""
this method is called when stream data has been annotated.
:param data:
:param sensordescription:
:return: The aggregated data
"""
if not data.fields:
return None
result = []
try:
aggregation_objs = self.aggregation_objs[sensordescription.uuid]
for key, agg in aggregation_objs.items():
agg_result = agg.control(data[key])
if agg_result:
g, start, end, size = agg_result
r = JSONObject()
r.graph = g
r.field = sensordescription.field[key]
r.sensorID = sensordescription.sensorID
r.propertyName = sensordescription.field[key].propertyName
r.category = sensordescription.sensorType
r.aggregationMethod = sensordescription.field[key].aggregationMethod
r.aggregationConfiguration = sensordescription.field[key].aggregationConfiguration
r.start = start
r.end = end
r.size = size
result.append(r)
return result
except Exception as e:
Log.e("aggregation failed due to Exception", e)
return None
