/// <summary>
///
/// </summary>
/// <param name="lstParameters"></param>
/// <param name="template"></param>
/// <returns></returns>
public string DonutFunctionToMongoAggregateElement(List <ParameterExpression> lstParameters, string template)
{
for (int i = 0; i < lstParameters.Count; i++)
{
var parameter = lstParameters[i];
object paramOutputObj;
var pValue = parameter.Value;
var argExpVisitor = new AggregateFeatureGeneratingExpressionVisitor(_script);
//If we visit functions here, note that in the pipeline
var paramStr = argExpVisitor.Visit(parameter as IExpression, out paramOutputObj);
var subAggregateTree = argExpVisitor.AggregateTree;
if (pValue is NameExpression varValue && varValue.Member != null)
{
var isRootIntegrationVar = varValue.Name == _script.GetRootIntegration().Name;
//Strip the root integration name in cases of [IntegrationName].[Function].
if (isRootIntegrationVar)
{
pValue = varValue.Member;
}
}
if (pValue is MemberExpression memberValue)
{
pValue = memberValue.Parent;
}
ChildStages.AddRange(subAggregateTree.Stages);
if (pValue is CallExpression || paramOutputObj is IDonutTemplateFunction <string> )
{
if (Function.Type == DonutFunctionType.GroupField)
{
if (paramOutputObj is IDonutTemplateFunction <string> iDonutFn &&
iDonutFn.Type == DonutFunctionType.Project)
{
throw new System.Exception(
$"Function {Function} is a grouping and cannot have projection arguments.");
}
}
}
template = FormatDonutFnAggregateParameter(template, pValue, paramOutputObj, i, paramStr);
}
return(template);
}
public AggregateFeatureCodeGenerator(DonutScript script, AggregateFeatureGeneratingExpressionVisitor expVisitor)
: base(script)
{
_donutFnResolver = new DonutFunctions();
_rootIntegration = script.Integrations.FirstOrDefault();
if (_rootIntegration == null)
{
throw new InvalidIntegrationException("Script has no integrations");
}
if (_rootIntegration.Fields == null || _rootIntegration.Fields.Count == 0)
{
throw new InvalidIntegrationException("Integration has no fields");
}
_rootDataMember = script.GetDatasetMember(_rootIntegration.Name);
_outputCollection = _rootIntegration.FeaturesCollection;
if (string.IsNullOrEmpty(_outputCollection))
{
throw new InvalidOperationException("Root integration must have a features collection set.");
}
_expVisitor = expVisitor ?? throw new ArgumentNullException(nameof(expVisitor));
_aggregateJobTrees = new List <AggregateJobTree>();
}
//private DataIntegration _integration;
public DonutScriptCodeGenerator(DonutScript script)
{
_expVisitor = new AggregateFeatureGeneratingExpressionVisitor(script);
//_integration = integration;
}
