public Dictionary <GremlinVariable, GremlinVariable> GetNewToOldSelectedVarMap(GremlinToSqlContext context)
{
Dictionary <GremlinVariable, GremlinVariable> newToOldSelectedVarMap = new Dictionary <GremlinVariable, GremlinVariable>();
if (context == null)
{
return(newToOldSelectedVarMap);
}
var allVariables = context.FetchVarsFromCurrAndChildContext();
foreach (var variable in allVariables)
{
var oldSelectedVar = variable as GremlinSelectedVariable;
if (oldSelectedVar != null && oldSelectedVar.IsFromSelect && !allVariables.Contains(oldSelectedVar.RealVariable))
{
List <GremlinVariable> newSelectVariableList = context.Select(oldSelectedVar.SelectKey);
GremlinVariable newSelectedVar;
switch (oldSelectedVar.Pop)
{
case GremlinKeyword.Pop.last:
newSelectedVar = newSelectVariableList.Last();
break;
case GremlinKeyword.Pop.first:
newSelectedVar = newSelectVariableList.First();
break;
default:
//TODO
throw new NotImplementedException("Can't process for now");
}
newToOldSelectedVarMap[newSelectedVar] = oldSelectedVar;
}
}
return(newToOldSelectedVarMap);
}