/// <summary>
/// throws MissingMethodsException atm, if a constructor could not be found.
/// </summary>
internal static Constructor GetBestMatchingConstructor(Type type, object[] args)
{
Constructor bestMatch = null;
int bestMatchScore = int.MinValue;
// this code does not take into account nullable structs.
// this could be provided as well easily, if anybody ever cares...
foreach (var c in ReflectionCache.JavaGetDeclaredConstructors(type))
{
var cargs = c.ParameterTypes;
if (cargs.Length != args.Length)
{
continue;
}
int match = 0;
for (int i = 0; i < args.Length; ++i)
{
if (args[i] == null)
{
if (cargs[i].IsValueType)
{
goto nomatch;
}
continue;
}
var argType = args[i].GetType();
if (cargs[i] == argType)
{
match += 3;
}
else if (cargs[i].IsAssignableFrom(argType))
{
match += 1;
}
else if (cargs[i].IsAssignableFrom(TypeHelper.EnsurePrimitiveType(type)))
{
match += 2;
}
else
{
goto nomatch;
}
}
if (match > bestMatchScore)
{
bestMatchScore = match;
bestMatch = c;
}
nomatch :;
}
if (bestMatch != null)
{
return(bestMatch);
}
var argumentTypes = args.Select(a => a == null
? "null"
: a.JavaGetClass().FullName);
string msg = string.Format("Could not find a matching constructor for type {0}({1})", type.FullName, string.Join(",", argumentTypes));
throw new MissingMethodException(msg);
}
