private static Graph GenerateGraph(string gdxFile, string v, string w)
{
if (!File.Exists(gdxFile))
{
throw new ArgumentException("Specified gdx file not found.");
}
//Workspace
FileInfo f = new FileInfo(gdxFile);
GAMS.GAMSWorkspace gamsProject = new GAMS.GAMSWorkspace(f.Directory.FullName);
using (GAMS.GAMSDatabase db = gamsProject.AddDatabaseFromGDX(gdxFile))
{
//read nodes
Dictionary <string, GamsNode> nodeLookup = new Dictionary <string, GamsNode>();
GAMS.GAMSSet gdxNodeSet = db.GetSet(v);
foreach (GAMS.GAMSSetRecord record in gdxNodeSet)
{
nodeLookup.Add(record.Keys[0], new GamsNode(record.Keys[0]));
}
//read arcs
GAMS.GAMSParameter gdxWeightPar = db.GetParameter(w);
Arc[] arcs = new Arc[gdxWeightPar.NumberRecords];
int k = 0;
foreach (GAMS.GAMSParameterRecord record in gdxWeightPar)
{
string first = record.Keys[0];
string second = record.Keys[1];
arcs[k] = new Arc(nodeLookup[first], nodeLookup[second], record.Value == double.Epsilon ? 0 : record.Value);
k++;
}
return(new Graph(arcs, nodeLookup.Values.ToArray()));
}
}
private static void ReturnResultGdx(string gdxFile, ShortestPath[] paths, long compTime)
{
FileInfo f = new FileInfo(gdxFile);
GAMS.GAMSWorkspace gamsProject = new GAMS.GAMSWorkspace(f.Directory.FullName);
using (GAMS.GAMSDatabase db = gamsProject.AddDatabaseFromGDX(gdxFile))
{
GAMS.GAMSParameter resultParameter;
try
{
resultParameter = db.GetParameter("spp");
resultParameter.Clear();
}
catch
{
resultParameter = db.AddParameter("spp", 2);
}
for (int i = 0; i < paths.Length; i++)
{
if (!paths[i].IsEmpty)
{
resultParameter.AddRecord(
((GamsNode)paths[i].OriginNode).GamsSetElement,
((GamsNode)paths[i].DestinationNode).GamsSetElement).Value = paths[i].TotalWeight;
}
}
//add computation time
GAMS.GAMSParameter statPar;
try
{
statPar = db.GetParameter("spp_stats");
statPar.Clear();
}
catch
{
statPar = db.AddParameter("spp_stats", 1);
}
statPar.AddRecord("Time_seconds").Value = Convert.ToDouble(compTime) / 1000d;
db.Export(f.FullName);
}
}