public ListResponse<NodeProbability> GetNodeProbabiltyForScan(LocationRequest request)
{
var result = new ListResponse<NodeProbability>();
ExecuteMaps(entities => { result.List = FingerprintService.GetNodeProbabiltyForScan(entities, request); },
result);
return result;
}
public static List<NodeProbability> GetNodeProbabiltyForScan(MapsEntities entities, LocationRequest request)
{
// Gesammelte WLAN-Fingerprints aus DB auswerten und Verteilung bestimmen
// Jetzt: gecachet!
FingerprintCacheObject cache = StudMapCache.Fingerprint(request.MapId);
MapCacheObject mapCache = StudMapCache.Map(request.MapId);
Node previousNode = mapCache.Nodes.ContainsKey(request.PreviousNodeId)
? mapCache.Nodes[request.PreviousNodeId]
: new Node {Id = 0};
// AccessPoint-Messung nach APs aufteilen
Dictionary<int, int> apScans = AnalyseInputScan(request.Scans, cache.MACtoAP);
// W'keit bestimmen, dass RSS-Werte an Knoten gemessen werden
Func<int, double> getDistance;
if (request.PreviousNodeId == 0)
getDistance = nodeId => 1.0;
else
getDistance = nodeId =>
{
double distance;
if (mapCache.PathFinder.TryGetDistance(previousNode.Id, nodeId, out distance))
return distance;
else
return -1;
};
List<NodeProbability> nodeProbs = CalculateNodeProbabilities(cache.NodeDistributions, apScans, getDistance);
// Absteigend nach W'keit sortieren
nodeProbs.Sort((m, n) => n.Probabilty.CompareTo(m.Probabilty));
// Maximal die angeforderte Anzahl an Knoten zurückliefern
int count = Math.Min(request.NodeCount, nodeProbs.Count);
return nodeProbs.GetRange(0, count);
}
public ObjectResponse<Node> GetNodeForFingerprint(LocationRequest request)
{
return new ObjectResponse<Node>();
}