public PositionEstimate GetPosition(string clientMac)
{
/**
* [WebGet] = SnifferReceiver operation (cf: http://msdn.microsoft.com/en-us/library/cc668788.aspx )
* usage example: http://localhost:38244/SnifferService.svc/GetPosition?mac='Big Mac'
*/
if (clientMac == null)
{
return(null);
}
SnifferWifiMeasurement curMeas;
if (!(currentOnlineMeasurements.TryGetValue(clientMac, out curMeas)))
{
return(null); //we do not have a measurement yet to base an estimate on
}
//Check whether the client is associated with a building
//If not, positioning has (JUST) been requested, but the correct building not established yet.
WifiPosEngine posEngine;
if (!(currentWifiPosEngines.TryGetValue(clientMac, out posEngine)))
{
return(null); //we do not have a wifi pos engine. Reason: User has probably not called StartWifiPositioning.
}
if (posEngine.getCurrentBuilding() == null) //It is the very first estimate
{
posEngine.setCurrentBuilding(getCorrectBuilding(curMeas));
}
EstimateResult currentEstimate = posEngine.getEstimate(curMeas);
//We have a result
if (currentEstimate != null && currentEstimate.getVertex() != null)
{
//convert estimated location to PositionEstimate
PositionEstimate result = new PositionEstimate();
Vertex v = currentEstimate.getVertex();
AbsoluteLocation a = v.AbsoluteLocations.First();
result.VertexID = v.ID;
result.Building_ID = v.Building_ID;
result.Latitude = (double)a.latitude;
result.Longitude = (double)a.longitude;
result.Altitude = (double)a.longitude;
result.Accuracy = currentEstimate.getErrorEstimate();
result.HasAccuracy = true;
result.HasBearing = false;
result.HasSpeed = false;
result.Provider = WIFI_PROVIDER;
result.Time = DateTime.Now;
return(result);
}
else //We do not have a result
{
return(null);
}
}
