GNServer(几何网络分析)扩展ArcGIS Rest—客户端实现

GNTrace

Geometric Network Trace需要的参数由GNTrace传入。

[b]GNTrace定义[/b]

package com.esrichina
{
import com.esri.ags.FeatureSet;

public class GNTrace
{
private var _edgeFlags:FeatureSet;
private var _junctionFlags:FeatureSet;
private var _edgeBarriers:FeatureSet;
private var _junctionBarriers:FeatureSet;
private var _traceType:String;
private var _disableLayers:String;
private var _edgeOutFields:String;
private var _junctionOutFields:String;

public function GNTrace()
{
}
}
}

GNTraceTask

GNTraceTask实现GeometricNetwork Trace的功能，包括queryGNLayerInfos和execute两个方法，前者查询Geometric Network包含的所有图层信息；后者执行Trace功能并返回结果（edge、junction）。

查询Gemetric Network图层信息

public function queryGNLayerInfos(responder:IResponder=null):AsyncToken{
var urlVariable:URLVariables = new URLVariables();
urlVariable.f = "json";
return (sendURLVariables(null, urlVariable, responder, handleLayerInfosDecodedObject));
}

解析查询返回的图层信息

private function handleLayerInfosDecodedObject(decodedObject:Object, asyncToken:AsyncToken):void{
var responder:IResponder;
_gnLayerInfos = decodedObject["Geometric Network Layers"];
for each (responder in asyncToken.responders) {
responder.result(_gnLayerInfos);
};
}

执行Trace功能

public function execute(gnTrace:GNTrace, responder:IResponder=null):AsyncToken{
var urlVariable:URLVariables = new URLVariables();
urlVariable.f = "json";
urlVariable.JunctionFlags = gnTrace.junctionFlags.convertToJSON();// "{\"features\":[{\"geometry\":{\"x\":557456.645, \"y\":42840.961}}]}";
urlVariable.EdgeFlags = gnTrace.edgeFlags == null ? "" :  gnTrace.edgeFlags.convertToJSON();
urlVariable.JunctionBarriers = gnTrace.junctionBarriers == null ? "" : gnTrace.junctionBarriers.convertToJSON();
urlVariable.EdgeBarriers = gnTrace.edgeBarriers == null ? "" : gnTrace.edgeBarriers.convertToJSON();
urlVariable.TraceType = gnTrace.traceType;// "Trace Downstream";
urlVariable.DisableLayers = gnTrace.disableLayers; //"";
urlVariable.EdgeOutFields = gnTrace.edgeOutFields;
urlVariable.JunctionOutFields = gnTrace.junctionOutFields;
return (sendURLVariables("/Trace", urlVariable, responder, handleDecodedObject));
}

解析Trace返回的结果

private function handleDecodedObject(decodedObject:Object, asyncToken:AsyncToken):void{
var responder:IResponder;

edgesFeatureSet = new FeatureSet();
junctionsFeatureSet = new FeatureSet();
edgesFeatureSet.features = [];
junctionsFeatureSet.features = [];
var edges:Array = decodedObject.Edges;
var junctions:Array = decodedObject.Junctions;
for(var egIndex:int = 0; egIndex < edges.length; egIndex++)
{
var paths:Array = edges[egIndex].geometry.paths;
var plinePaths:Array = new Array();
for (var pthIndex:int = 0; pthIndex < paths.length; pthIndex++)
{
var pts:Array = paths[pthIndex];
var plinePts:Array = new Array();
for(var ptIndex:int = 0; ptIndex < pts.length; ptIndex++)
{
var plinePt:MapPoint = new MapPoint((Number)(pts[ptIndex][0]), (Number)(pts[ptIndex][1]));
plinePts.push(plinePt);
}
plinePaths.push(plinePts);
}
var pline:Polyline = new Polyline(plinePaths);
var linegra:Graphic = new Graphic(pline);
linegra.attributes = edges[egIndex].attributes;
edgesFeatureSet.features.push(linegra);
}

for(var jcIndex:int = 0; jcIndex < junctions.length; jcIndex++)
{
var pt:MapPoint = new MapPoint((Number)(junctions[jcIndex].geometry.x), (Number)(junctions[jcIndex].geometry.y));
var ptgra:Graphic = new Graphic(pt);
ptgra.attributes = junctions[jcIndex].attributes;
junctionsFeatureSet.features.push(ptgra);
}

for each (responder in asyncToken.responders) {
responder.result(edgesFeatureSet);
};
}