/// <summary>
/// Finds all signatures for the given function name.
/// Search in both BuiltIn uri functions and Custom uri functions.
/// Combine and return the signatures overloads of the results.
/// </summary>
/// <param name="functionName">The function to get the signatures for.</param>
/// <returns>The signatures which match the supplied function name.</returns>
internal static FunctionSignatureWithReturnType[] GetUriFunctionSignatures(string functionName)
{
FunctionSignatureWithReturnType[] customUriFunctionsSignatures = null;
FunctionSignatureWithReturnType[] builtInUriFunctionsSignatures = null;
// Try to find the function in the user custom functions and in our built-in functions
bool customFound = CustomUriFunctions.TryGetCustomFunction(functionName, out customUriFunctionsSignatures);
bool builtInFound = BuiltInUriFunctions.TryGetBuiltInFunction(functionName, out builtInUriFunctionsSignatures);
if (!customFound && !builtInFound)
{
// Not found in both built-in and custom.
throw new ODataException(ODataErrorStrings.MetadataBinder_UnknownFunction(functionName));
}
if (!customFound)
{
Debug.Assert(builtInUriFunctionsSignatures != null, "No Built-in functions found");
return(builtInUriFunctionsSignatures);
}
if (!builtInFound)
{
Debug.Assert(customUriFunctionsSignatures != null, "No Custom functions found");
return(customUriFunctionsSignatures);
}
return(builtInUriFunctionsSignatures.Concat(customUriFunctionsSignatures).ToArray());
}
/// <summary>
/// Add a custom uri function to extend uri functions.
/// In case the function name already exists as a custom function, the signature will be added as an another overload.
/// </summary>
/// <param name="functionName">The new custom function name</param>
/// <param name="functionSignature">The new custom function signature</param>
/// <exception cref="ArgumentNullException">Arguments are null, or function signature return type is null</exception>
/// <exception cref="ODataException">Throws if built-in function name already exists.</exception>
/// <exception cref="ODataException">Throws if built-in function signature overload already exists.</exception>
/// <exception cref="ODataException">Throws if custom function signature overload already exists</exception>
public static void AddCustomUriFunction(string functionName, FunctionSignatureWithReturnType functionSignature)
{
// Parameters validation
ExceptionUtils.CheckArgumentStringNotNullOrEmpty(functionName, "customFunctionName");
ExceptionUtils.CheckArgumentNotNull(functionSignature, "newCustomFunctionSignature");
ValidateFunctionWithReturnType(functionSignature);
// Thread saftey - before using the custom functions dictionary
lock (Locker)
{
// Check if the function does already exists in the Built-In functions
// If 'addAsOverloadToBuiltInFunction' parameter is false - throw expection
// Else, add as a custom function
FunctionSignatureWithReturnType[] existingBuiltInFunctionOverload;
if (BuiltInUriFunctions.TryGetBuiltInFunction(functionName, out existingBuiltInFunctionOverload))
{
// Function name exists, check if full signature exists among the overloads.
if (existingBuiltInFunctionOverload.Any(builtInFunction =>
AreFunctionsSignatureEqual(functionSignature, builtInFunction)))
{
throw new ODataException(Strings.CustomUriFunctions_AddCustomUriFunction_BuiltInExistsFullSignature(functionName));
}
}
AddCustomFunction(functionName, functionSignature);
}
}
internal static IList <KeyValuePair <string, FunctionSignatureWithReturnType> > GetUriFunctionSignatures(string functionCallToken, bool enableCaseInsensitive = false)
{
IList <KeyValuePair <string, FunctionSignatureWithReturnType> > customUriFunctionsNameSignatures = null;
FunctionSignatureWithReturnType[] builtInUriFunctionsSignatures = null;
IList <KeyValuePair <string, FunctionSignatureWithReturnType> > builtInUriFunctionsNameSignatures = null;
// Try to find the function in the user custom functions
bool customFound = CustomUriFunctions.TryGetCustomFunction(functionCallToken, out customUriFunctionsNameSignatures,
enableCaseInsensitive);
// And find in our built-in functions
// Since list of all built-in functions is a fixed list and is initialized with names in lower case,
// such as "endswith", "geo.distance", "maxdatetime" and "round",
// => For case-insensitive searching, it is more efficient to convert the search key to lower case first
// and then do a case-sensitive match.
string nameKey = enableCaseInsensitive
? functionCallToken.ToLowerInvariant()
: functionCallToken;
bool builtInFound = BuiltInUriFunctions.TryGetBuiltInFunction(nameKey, out builtInUriFunctionsSignatures);
// Populate the matched names found for built-in function
if (builtInFound)
{
builtInUriFunctionsNameSignatures =
builtInUriFunctionsSignatures.Select(sig => new KeyValuePair <string, FunctionSignatureWithReturnType>(nameKey, sig)).ToList();
}
if (!customFound && !builtInFound)
{
// Not found in both built-in and custom.
throw new ODataException(ODataErrorStrings.MetadataBinder_UnknownFunction(functionCallToken));
}
if (!customFound)
{
Debug.Assert(builtInUriFunctionsNameSignatures != null, "No Built-in functions found");
return(builtInUriFunctionsNameSignatures);
}
if (!builtInFound)
{
Debug.Assert(customUriFunctionsNameSignatures != null, "No Custom functions found");
return(customUriFunctionsNameSignatures);
}
return(builtInUriFunctionsNameSignatures.Concat(customUriFunctionsNameSignatures).ToArray());
}
