/// <summary>
///
/// </summary>
/// <param name="name">The name of the field</param>
/// <param name="stage">The stage that you're processing</param>
/// <param name="sbProjections">A buffer of projections to append to</param>
/// <param name="sbGroups">A buffer of group fields to append to</param>
/// <param name="stageJson">The name wrapped json of a stage</param>
private static void GenerateStageAggregateCode(string name, AggregateStage stage, StringBuilder sbProjections,
StringBuilder sbGroups, string stageJson)
{
switch (stage.Type)
{
case AggregateStageType.Group:
//TODO: provide group name
var stageWrap = stage.WrapValueWithRoot(name);
var gBsonDoc = $"groupFields.Merge(BsonDocument.Parse({stageWrap}));";
//Append our group to the projections so that it's visible
var pBsonDocFake = $"projections.Merge(new BsonDocument" + "{{\"" + name + "\", \"$" +
name + "\"}}" + ");";
sbProjections.AppendLine(pBsonDocFake);
sbGroups.AppendLine(gBsonDoc);
break;
case AggregateStageType.Project:
var pBsonDoc = $"projections.Merge(BsonDocument.Parse({stageJson}));";
sbProjections.AppendLine(pBsonDoc);
break;
default:
throw new NotImplementedException("Support for root pipeline expression not implemented: " +
stage.Type.ToString());
}
}
public AggregateStage AddProjection(IDonutFunction function)
{
var stage = new AggregateStage(_script, function);
Stages.Add(stage);
return(stage);
}
public AggregateStage Clone()
{
var nstage = new AggregateStage(_script, Function);
nstage.Type = Type;
nstage.ChildStages = new List <AggregateStage>(ChildStages.ToArray());
return(nstage);
}