/// <summary>
/// Gets the function as specified by the function key.
/// All parameters are assumed to be <see cref="ParameterMode.In" />.
/// </summary>
/// <param name="functionName"> Name of the function </param>
/// <param name="parameterTypes"> types of the parameters </param>
/// <param name="ignoreCase"> true for case-insensitive lookup </param>
/// <param name="function"> The function that needs to be returned </param>
/// <returns> The function as specified in the function key or null </returns>
/// <exception cref="System.ArgumentNullException">if functionName or parameterTypes argument is null</exception>
/// <exception cref="System.ArgumentException">if no function is found with the given name or with given input parameters</exception>
internal bool TryGetFunction(string functionName, TypeUsage[] parameterTypes, bool ignoreCase, out EdmFunction function)
{
Check.NotNull(functionName, "functionName");
Check.NotNull(parameterTypes, "parameterTypes");
var functionIdentity = EdmFunction.BuildIdentity(functionName, parameterTypes);
GlobalItem item = null;
function = null;
if (TryGetValue(functionIdentity, ignoreCase, out item) &&
Helper.IsEdmFunction(item))
{
function = (EdmFunction)item;
return(true);
}
return(false);
}
internal bool TryGetFunction(
string functionName,
TypeUsage[] parameterTypes,
bool ignoreCase,
out EdmFunction function)
{
Check.NotNull <string>(functionName, nameof(functionName));
Check.NotNull <TypeUsage[]>(parameterTypes, nameof(parameterTypes));
string identity = EdmFunction.BuildIdentity(functionName, (IEnumerable <TypeUsage>)parameterTypes);
GlobalItem globalItem = (GlobalItem)null;
function = (EdmFunction)null;
if (!this.TryGetValue(identity, ignoreCase, out globalItem) || !Helper.IsEdmFunction(globalItem))
{
return(false);
}
function = (EdmFunction)globalItem;
return(true);
}
