internal ConstructorData GetConstructorData(IList<ConstructorInfo> constructors, Arguments args)
{
/*
0: No Constructors : Throw Ex
1: Only Default Constructor, No Arguments : Invoke()
2: Only Default Constructor, Arguments supplied : Invoke()
3: Onlt Parameterised, No Arguments : Throw Ex()
4: Only Parameterised, Constructors with all args = 0 : Throw Ex
5: Only Parameterised, Constructors with exact args : Invoke()
6: Only Parameterised, Constructors with all args, registry cannot fill remainder : Throw Ex
7: Only Parameterised, Constructors with all args, registry can fill remainder : Invoke()
8: Mixed Constructors, No Arguments : Invoke()
9: Mixed Constructors, Constructors with all args = 0 : Throw Ex
10: Mixed Constructors, Constructors with exact args : Invoke()
11: Mixed Constructors, Constructors with all args, registry cannot fill remainder : Throw Ex
12: Mixed Constructors, Constructors with all args, registry can fill remainder : Invoke()
*/
//none
if (constructors.Count == 0)
{
throw new ConstructorException();
}
//only Default
if (constructors.All(c => c.GetParameters().Count() == 0))
{
//1
if (args.Count != 0)
{
throw new ConstructorException();
}
//2
return new ConstructorData(constructors.First());
}
//Only Parameterised
if (constructors.All(c => c.GetParameters().Count() > 0))
{
//3
if (args.Count == 0)
{
throw new ConstructorException();
}
//4
if (!constructors.Any(c => args.All(a => c.GetParameters().Contains(a))))
{
throw new ConstructorException();
}
var withAll = constructors.Where(c => args.All(a => c.GetParameters().Contains(a)));
var exact = withAll.Where(c => c.GetParameters().Count() == args.Count);
//5
if (exact.Count() > 0)
{
var best = GetBestMatch(exact, args, null);
return new ConstructorData(best.Constructor, best.Arguments);
}
//6
var unmatchedArgs = GetUnmatchedArgs(withAll, args);
if (!unmatchedArgs.Any(u => _registry.ContainsAll(u.Value.Select(p => p.ParameterType))))
{
throw new ConstructorException();
}
//7
var bestMatch = GetBestMatch(exact, args, unmatchedArgs);
return new ConstructorData(bestMatch.Constructor , bestMatch.Arguments);
}
//mixed
if (constructors.Any(c => c.GetParameters().Count() > 0) && constructors.Any(c => c.GetParameters().Count() == 0))
{
//8
if (args.Count == 0)
{
var ctor = constructors.First(c => c.GetParameters().Count() == 0);
return new ConstructorData(ctor);
}
//9
if (!constructors.Any(c => args.All(a => c.GetParameters().Contains(a))))
{
throw new ConstructorException();
}
var withAll = constructors.Where(c => args.All(a => c.GetParameters().Contains(a)));
var exact = withAll.Where(c => c.GetParameters().Count() == args.Count);
//10
if (exact.Count() > 0)
{
var best = GetBestMatch(exact, args, new Dictionary<ConstructorInfo, IList<ParameterInfo>>() );
return new ConstructorData(best.Constructor, best.Arguments);
}
//11
var unmatchedArgs = GetUnmatchedArgs(withAll, args);
if (!unmatchedArgs.Any(u => _registry.ContainsAll(u.Value.Select(p => p.ParameterType))))
{
throw new ConstructorException();
}
//12
var bestMatch = GetBestMatch(exact, args, unmatchedArgs);
return new ConstructorData(bestMatch.Constructor, bestMatch.Arguments);
}
throw new ConstructorException();
}