TrafficLayer

protocol OnTrafficSpeedQueriedDelegate {
    func onQuerySuccess(proposedSpeed: Int)
}


class TrafficSpeedLayer: AGSFeatureLayer, AGSFeatureLayerQueryDelegate, AGSLayerDelegate {

    var featureLayer: AGSFeatureLayer!
    var point: AGSPoint!
    var trafficSpeedDelegate: OnTrafficSpeedQueriedDelegate!

    override init!(url: URL!, mode: AGSFeatureLayerMode, credential cred: AGSCredential!) {

        super.init(url: url, mode: mode, credential: cred)
        self.delegate = self
        self.queryDelegate = self
    }

    deinit {

    }

    required init!(json: [AnyHashable: Any]!) {
        fatalError("init(JSON:) has not been implemented")
    }

    func layerDidLoad(_ layer: AGSLayer!) {
        if layer != nil {
            let query = AGSQuery()
            query.whereClause = "1=1"
            query.outFields = ["*"]
            query.returnGeometry = true
            query.geometry = point
            query.spatialRelationship = .intersects
            query.outSpatialReference = Constants.WGS84_SPATIAL_REFERENCE

            self.queryDelegate = self
            self.queryFeatures(query)
        }
    }

    func featureLayer(_ featureLayer: AGSFeatureLayer!, operation op: Operation!, didQueryFeaturesWith featureSet: AGSFeatureSet!) {

            if featureSet.features.count == 0 {
                // No data for the queried road
                trafficSpeedDelegate.onQuerySuccess(proposedSpeed: 0)
           } else {
                for speed in featureSet.features {

                    if let value = (speed as AnyObject).allAttributes()["DATA"] {
                        if value is NSNull {
                            // No value


                        } else {
                            trafficSpeedDelegate.onQuerySuccess(proposedSpeed: value as! Int)

                        }
                    }
                }
            }
    }
}