/// <summary>
/// Finds the signature that best matches the arguments
/// </summary>
/// <param name="functionCallToken">The name of the function</param>
/// <param name="argumentNodes">The nodes of the arguments, can be new {null,null}.</param>
/// <param name="nameSignatures">The name-signature pairs to match against</param>
/// <returns>Returns the matching signature or throws</returns>
internal static KeyValuePair <string, FunctionSignatureWithReturnType> MatchSignatureToUriFunction(string functionCallToken, SingleValueNode[] argumentNodes,
IList <KeyValuePair <string, FunctionSignatureWithReturnType> > nameSignatures)
{
KeyValuePair <string, FunctionSignatureWithReturnType> nameSignature;
IEdmTypeReference[] argumentTypes = argumentNodes.Select(s => s.TypeReference).ToArray();
// Handle the cases where we don't have type information (null literal, open properties) for ANY of the arguments
int argumentCount = argumentTypes.Length;
if (argumentTypes.All(a => a == null) && argumentCount > 0)
{
// we specifically want to find just the first function that matches the number of arguments, we don't care about
// ambiguity here because we're already in an ambiguous case where we don't know what kind of types
// those arguments are.
KeyValuePair <string, FunctionSignatureWithReturnType> found = nameSignatures.FirstOrDefault(pair => pair.Value.ArgumentTypes.Length == argumentCount);
if (found.Equals(TypePromotionUtils.NotFoundKeyValuePair))
{
throw new ODataException(ODataErrorStrings.FunctionCallBinder_CannotFindASuitableOverload(functionCallToken, argumentTypes.Length));
}
else
{
// in this case we can't assert the return type, we can only assert that a function exists... so
// we need to set the return type to null.
nameSignature = new KeyValuePair <string, FunctionSignatureWithReturnType>(
found.Key, new FunctionSignatureWithReturnType(null, found.Value.ArgumentTypes));
}
}
else
{
nameSignature =
TypePromotionUtils.FindBestFunctionSignature(nameSignatures, argumentNodes, functionCallToken);
if (nameSignature.Equals(TypePromotionUtils.NotFoundKeyValuePair))
{
throw new ODataException(ODataErrorStrings.MetadataBinder_NoApplicableFunctionFound(
functionCallToken,
UriFunctionsHelper.BuildFunctionSignatureListDescription(functionCallToken, nameSignatures.Select(sig => sig.Value))));
}
}
return(nameSignature);
}
/// <summary>
/// Finds the signature that best matches the arguments
/// </summary>
/// <param name="functionName">The name of the function</param>
/// <param name="argumentNodes">The nodes of the arguments, can be new {null,null}.</param>
/// <param name="signatures">The signatures to match against</param>
/// <returns>Returns the matching signature or throws</returns>
internal static FunctionSignatureWithReturnType MatchSignatureToUriFunction(string functionName, SingleValueNode[] argumentNodes, FunctionSignatureWithReturnType[] signatures)
{
FunctionSignatureWithReturnType signature;
IEdmTypeReference[] argumentTypes = argumentNodes.Select(s => s.TypeReference).ToArray();
// Handle the cases where we don't have type information (null literal, open properties) for ANY of the arguments
int argumentCount = argumentTypes.Length;
if (argumentTypes.All(a => a == null) && argumentCount > 0)
{
// we specifically want to find just the first function that matches the number of arguments, we don't care about
// ambiguity here because we're already in an ambiguous case where we don't know what kind of types
// those arguments are.
signature = signatures.FirstOrDefault(candidateFunction => candidateFunction.ArgumentTypes.Count() == argumentCount);
if (signature == null)
{
throw new ODataException(ODataErrorStrings.FunctionCallBinder_CannotFindASuitableOverload(functionName, argumentTypes.Count()));
}
else
{
// in this case we can't assert the return type, we can only assert that a function exists... so
// we need to set the return type to null.
signature = new FunctionSignatureWithReturnType(null, signature.ArgumentTypes);
}
}
else
{
signature = TypePromotionUtils.FindBestFunctionSignature(signatures, argumentNodes);
if (signature == null)
{
throw new ODataException(ODataErrorStrings.MetadataBinder_NoApplicableFunctionFound(
functionName,
UriFunctionsHelper.BuildFunctionSignatureListDescription(functionName, signatures)));
}
}
return(signature);
}