public override void ModulateBy(GraphTraversal traversal)
{
ByModulatingList.Add(new Tuple <GraphTraversal, IComparer>(traversal, new IncrOrder()));
}
public override void ModulateBy(GraphTraversal traversal, IComparer comparer)
{
ByModulatingList.Add(new Tuple <GraphTraversal, IComparer>(traversal, comparer));
}
internal override GremlinToSqlContext GetContext()
{
GremlinToSqlContext inputContext = GetInputContext();
if (inputContext.PivotVariable == null)
{
throw new TranslationException("The PivotVariable of order()-step can't be null.");
}
if (ByModulatingList.Count == 0)
{
ByModulatingList.Add(new Tuple <GraphTraversal, IComparer>(GraphTraversal.__(), new IncrOrder()));
}
var newByModulatingList = new List <Tuple <GremlinToSqlContext, IComparer> >();
foreach (var pair in ByModulatingList)
{
GraphTraversal traversal = pair.Item1;
GremlinToSqlContext context = null;
if (Scope == GremlinKeyword.Scope.Global)
{
traversal.GetStartOp().InheritedVariableFromParent(inputContext);
context = traversal.GetEndOp().GetContext();
}
if (Scope == GremlinKeyword.Scope.Local)
{
//g.V().groupCount().order(Local).by(Keys) or g.V().groupCount().order(Local).by(__.select(Keys))
if (traversal.GremlinTranslationOpList.Count >= 2 && traversal.GremlinTranslationOpList[1] is GremlinSelectColumnOp)
{
//FROM selectColumn(C._value, "Keys"/"Values")
GremlinToSqlContext newContext = new GremlinToSqlContext();
GremlinOrderLocalInitVariable initVar = new GremlinOrderLocalInitVariable(inputContext.PivotVariable);
newContext.VariableList.Add(initVar);
newContext.SetPivotVariable(initVar);
traversal.GetStartOp().InheritedContextFromParent(newContext);
context = traversal.GetEndOp().GetContext();
}
else
{
//FROM decompose1(C._value)
GremlinToSqlContext newContext = new GremlinToSqlContext();
GremlinDecompose1Variable decompose1 = new GremlinDecompose1Variable(inputContext.PivotVariable);
newContext.VariableList.Add(decompose1);
newContext.TableReferencesInFromClause.Add(decompose1);
newContext.SetPivotVariable(decompose1);
traversal.GetStartOp().InheritedContextFromParent(newContext);
context = traversal.GetEndOp().GetContext();
}
}
newByModulatingList.Add(new Tuple <GremlinToSqlContext, IComparer>(context, pair.Item2));
}
inputContext.PivotVariable.Order(inputContext, newByModulatingList, Scope);
return(inputContext);
}
