private GremlinPathVariable generatePath(GremlinToSqlContext currentContext, List <GraphTraversal2> byList = null)
{
List <GremlinToSqlContext> byContexts = new List <GremlinToSqlContext>();
List <GremlinPathStepVariable> steps = currentContext.GetGremlinStepList();
if (byList == null)
{
byList = new List <GraphTraversal2> {
GraphTraversal2.__()
};
}
foreach (var by in byList)
{
GremlinToSqlContext newContext = new GremlinToSqlContext();
GremlinDecompose1Variable decompose1 = new GremlinDecompose1Variable(steps);
newContext.VariableList.Add(decompose1);
newContext.TableReferences.Add(decompose1);
newContext.SetPivotVariable(decompose1);
by.GetStartOp().InheritedContextFromParent(newContext);
byContexts.Add(by.GetEndOp().GetContext());
}
GremlinPathVariable newVariable = new GremlinPathVariable(steps, byContexts);
currentContext.VariableList.Add(newVariable);
currentContext.TableReferences.Add(newVariable);
return(newVariable);
}
internal override GremlinToSqlContext GetContext()
{
GremlinToSqlContext inputContext = GetInputContext();
if (inputContext.PivotVariable == null)
{
throw new QueryCompilationException("The PivotVariable can't be null.");
}
if (this.ByModulatingList.Count == 0)
{
this.ByModulatingList.Add(new Tuple <GraphTraversal2, IComparer>(GraphTraversal2.__(), new IncrOrder()));
}
var newByModulatingList = new List <Tuple <GremlinToSqlContext, IComparer> >();
foreach (var pair in this.ByModulatingList)
{
GraphTraversal2 traversal = pair.Item1;
GremlinToSqlContext context = null;
//g.V().groupCount().order(Local).by(Keys) or g.V().groupCount().order(Local).by(__.select(Keys))
if (traversal.TranslationOpList.Count >= 2 && traversal.TranslationOpList[1] is GremlinSelectColumnOp)
{
//FROM selectColumn(C._value, "Keys"/"Values")
GremlinToSqlContext newContext = new GremlinToSqlContext();
GremlinOrderLocalInitVariable initVar = new GremlinOrderLocalInitVariable();
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.TableReferences.Add(decompose1);
newContext.SetPivotVariable(decompose1);
traversal.GetStartOp().InheritedContextFromParent(newContext);
context = traversal.GetEndOp().GetContext();
}
newByModulatingList.Add(new Tuple <GremlinToSqlContext, IComparer>(context, pair.Item2));
}
inputContext.PivotVariable.OrderLocal(inputContext, newByModulatingList);
return(inputContext);
}
internal virtual GremlinSelectVariable GetSelectVar(GremlinToSqlContext currentContext, GremlinKeyword.Pop pop, List <string> selectKeys, List <GraphTraversal2> byList = null)
{
//TODO: refactor
if (byList == null)
{
byList = new List <GraphTraversal2>()
{
GraphTraversal2.__()
};
}
List <GremlinToSqlContext> byContexts = new List <GremlinToSqlContext>();
List <GremlinVariable> steps = currentContext.GetGlobalPathStepList();
List <GremlinVariable> sideEffectVariables = currentContext.GetSideEffectVariables();
GremlinGlobalPathVariable pathVariable = new GremlinGlobalPathVariable(steps);
currentContext.VariableList.Add(pathVariable);
currentContext.TableReferences.Add(pathVariable);
foreach (var by in byList)
{
GremlinToSqlContext newContext = new GremlinToSqlContext();
GremlinDecompose1Variable decompose1 = new GremlinDecompose1Variable(pathVariable);
newContext.VariableList.Add(decompose1);
newContext.TableReferences.Add(decompose1);
newContext.SetPivotVariable(decompose1);
by.GetStartOp().InheritedContextFromParent(newContext);
byContexts.Add(by.GetEndOp().GetContext());
}
GremlinSelectVariable newVariable = new GremlinSelectVariable(this, pathVariable, sideEffectVariables, pop, selectKeys, byContexts);
currentContext.VariableList.Add(newVariable);
currentContext.TableReferences.Add(newVariable);
return(newVariable);
}