public SpecialFunctionExpression(SPAGSConverter convert, SPAGS.Function spagsFunc, string pattern, MutateExpression mutate)
{
Match returnType = Regex.Match(pattern, @"^(.*?)(\s*\-\>\s*(\S+)\s*)$");
if (returnType.Success)
{
pattern = returnType.Groups[1].Value;
ReturnValueTypes = (PossibleValueTypes)Enum.Parse(typeof(PossibleValueTypes), returnType.Groups[3].Value);
}
else
{
ReturnValueTypes = convert.GetValueTypes(spagsFunc.Signature.ReturnType);
}
Pattern = pattern;
SPAGSFunction = spagsFunc;
this.convert = convert;
Mutate = mutate;
}
protected override ScalarExpression OnBuildQuery(QueryBuilderContext context)
{
ScalarExpression arg = Argument.BuildQuery(context);
if (ResultType.Type == DataType.Entity)
{
return(arg);
}
// Special case for AggregateExpression, because if we aggregate a choicefield, then it presents
// as an Entity type, therefore requesting this cast - but the query builder wants to receive the aggregate expression directly.
if (arg is EDC.ReadiNow.Metadata.Query.Structured.AggregateExpression)
{
var result = new MutateExpression {
Expression = arg
};
switch (ResultType.Type)
{
case DataType.String:
result.MutateType = MutateType.DisplaySql;
break;
case DataType.Bool:
result.MutateType = MutateType.BoolSql;
break;
default:
throw new InvalidOperationException(ResultType.Type.ToString( ));
}
return(result);
}
// Just refer to the node
var queryNode = context.GetNode(Argument);
switch (ResultType.Type)
{
case DataType.String:
var nameResult = new ResourceDataColumn
{
FieldId = "core:name",
NodeId = queryNode.NodeId
};
return(nameResult);
case DataType.Bool:
var boolResult = new CalculationExpression
{
Operator = CalculationOperator.IsNull,
Expressions = new List <ScalarExpression>
{
new IdExpression {
NodeId = queryNode.NodeId
}
}
};
return(boolResult);
default:
throw new InvalidOperationException(ResultType.Type.ToString());
}
}
