public override FieldObject Evaluate(RawRecord record)
{
List <FieldObject> path = new List <FieldObject>();
foreach (Tuple <ScalarFunction, bool, HashSet <string> > tuple in pathStepList)
{
ScalarFunction accessPathStepFunc = tuple.Item1;
bool needsUnfold = tuple.Item2;
HashSet <string> stepLabels = tuple.Item3;
if (accessPathStepFunc == null)
{
PathStepField pathStepField = new PathStepField(null);
foreach (string label in stepLabels)
{
pathStepField.AddLabel(label);
}
path.Add(pathStepField);
continue;
}
FieldObject step = accessPathStepFunc.Evaluate(record);
if (step == null)
{
PathStepField lastPathStep;
if (path.Any())
{
lastPathStep = (PathStepField)path[path.Count - 1];
}
else
{
lastPathStep = new PathStepField(null);
path.Add(lastPathStep);
}
foreach (string label in stepLabels)
{
lastPathStep.AddLabel(label);
}
continue;
}
if (needsUnfold)
{
PathField subPath = step as PathField;
Debug.Assert(subPath != null, "(subPath as PathField) != null");
foreach (PathStepField subPathStep in subPath.Path.Cast <PathStepField>())
{
if (subPathStep.StepFieldObject == null)
{
if (path.Any())
{
PathStepField lastPathStep = (PathStepField)path[path.Count - 1];
foreach (string label in subPathStep.Labels)
{
lastPathStep.AddLabel(label);
}
}
else
{
path.Add(subPathStep);
}
continue;
}
PathStepField pathStepField = new PathStepField(subPathStep.StepFieldObject);
foreach (string label in subPathStep.Labels)
{
pathStepField.AddLabel(label);
}
path.Add(pathStepField);
}
PathStepField lastSubPathStep = (PathStepField)path.Last();
foreach (string label in stepLabels)
{
lastSubPathStep.AddLabel(label);
}
}
else
{
PathStepField pathStepField = new PathStepField(step);
foreach (string label in stepLabels)
{
pathStepField.AddLabel(label);
}
path.Add(pathStepField);
}
}
return(new PathField(path));
}
public override RawRecord Next()
{
RawRecord inputRec;
while (this.inputOp.State() && (inputRec = this.inputOp.Next()) != null)
{
List <FieldObject> path = new List <FieldObject>();
int activeByFuncIndex = 0;
foreach (Tuple <ScalarFunction, bool, HashSet <string> > tuple in pathStepList)
{
ScalarFunction accessPathStepFunc = tuple.Item1;
bool needsUnfold = tuple.Item2;
HashSet <string> stepLabels = tuple.Item3;
if (accessPathStepFunc == null)
{
PathStepField pathStepField = new PathStepField(null);
foreach (string label in stepLabels)
{
pathStepField.AddLabel(label);
}
path.Add(pathStepField);
continue;
}
FieldObject step = accessPathStepFunc.Evaluate(inputRec);
if (step == null)
{
PathStepField lastPathStep;
if (path.Any())
{
lastPathStep = (PathStepField)path[path.Count - 1];
}
else
{
lastPathStep = new PathStepField(null);
path.Add(lastPathStep);
}
foreach (string label in stepLabels)
{
lastPathStep.AddLabel(label);
}
continue;
}
if (needsUnfold)
{
PathField subPath = step as PathField;
Debug.Assert(subPath != null, "(subPath as PathField) != null");
foreach (PathStepField subPathStep in subPath.Path.Cast <PathStepField>())
{
if (subPathStep.StepFieldObject == null)
{
if (path.Any())
{
PathStepField lastPathStep = (PathStepField)path[path.Count - 1];
foreach (string label in subPathStep.Labels)
{
lastPathStep.AddLabel(label);
}
}
else
{
path.Add(subPathStep);
}
continue;
}
FieldObject pathStep = GetStepProjectionResult(subPathStep.StepFieldObject, ref activeByFuncIndex);
PathStepField pathStepField = new PathStepField(pathStep);
foreach (string label in subPathStep.Labels)
{
pathStepField.AddLabel(label);
}
path.Add(pathStepField);
}
PathStepField lastSubPathStep = (PathStepField)path.Last();
foreach (string label in stepLabels)
{
lastSubPathStep.AddLabel(label);
}
}
else
{
FieldObject pathStep = GetStepProjectionResult(step, ref activeByFuncIndex);
Compose1Field compose1PathStep = pathStep as Compose1Field;
Debug.Assert(compose1PathStep != null, "compose1PathStep != null");
//
// g.V().optional(__.count().V()).path()
//
if (compose1PathStep[compose1PathStep.DefaultProjectionKey] == null)
{
continue;
}
PathStepField pathStepField = new PathStepField(pathStep);
foreach (string label in stepLabels)
{
pathStepField.AddLabel(label);
}
path.Add(pathStepField);
}
}
RawRecord r = new RawRecord(inputRec);
r.Append(new PathField(path));
return(r);
}
this.Close();
return(null);
}
