/// <summary>Implements the visitor pattern for the function.</summary>
/// <returns>The implemented visitor pattern.</returns>
/// <param name="functionMetadata">The function metadata.</param>
protected override EdmFunction VisitFunction(EdmFunction functionMetadata)
{
var paramTypes = new List <TypeUsage>(functionMetadata.Parameters.Count);
foreach (var funcParam in functionMetadata.Parameters)
{
var mappedParamType = VisitTypeUsage(funcParam.TypeUsage);
paramTypes.Add(mappedParamType);
}
if (DataSpace.SSpace
== functionMetadata.DataSpace)
{
EdmFunction foundFunc = null;
if (_metadata.TryGetFunction(
functionMetadata.Name,
functionMetadata.NamespaceName,
paramTypes.ToArray(),
false /* ignoreCase */,
functionMetadata.DataSpace,
out foundFunc)
&&
foundFunc != null)
{
return(foundFunc);
}
}
else
{
// Find the function or function import.
IList <EdmFunction> candidateFunctions;
if (_perspective.TryGetFunctionByName(
functionMetadata.NamespaceName, functionMetadata.Name, /*ignoreCase:*/ false, out candidateFunctions))
{
Debug.Assert(
null != candidateFunctions && candidateFunctions.Count > 0,
"Perspective.TryGetFunctionByName returned true with null/empty function result list");
bool isAmbiguous;
var retFunc = FunctionOverloadResolver.ResolveFunctionOverloads(
candidateFunctions, paramTypes, /*isGroupAggregateFunction:*/ false, out isAmbiguous);
if (!isAmbiguous
&&
retFunc != null)
{
return(retFunc);
}
}
}
throw new ArgumentException(
Strings.Cqt_Copier_FunctionNotFound(TypeHelpers.GetFullName(functionMetadata.NamespaceName, functionMetadata.Name)));
}