public IInstanceFactory Handle(IResolverRequest request, Func<IResolverRequest, IInstanceFactory> nextHandler)
{
if (request == null) throw new ArgumentNullException("request");
if (nextHandler == null) throw new ArgumentNullException("nextHandler");
// If the component handler is last in the pipeline, this will return null.
// However, it might not *always* be the last handler, so stick to the pattern
// and pass to the next handler rather than returning null explicitly.
if (request.RequestType.IsAbstract) return nextHandler(request);
var ctors = request.RequestType
.GetConstructors(BindingFlags.Public | BindingFlags.DeclaredOnly | BindingFlags.Instance);
// this bad boy does the actual resolving...
var ctorResolver = new ConstructorResolver(_pipeline);
// ... we just order the results
var factory = ctors
.Select(ctor => ctorResolver.TryResolve(request, ctor))
.Where(f => f != null) // remove unresolvable ctors
.OrderByDescending(f => f.Resolvable) // order by most parameters
.OrderBy(f => f.Optional) // with the least optional parameters
.FirstOrDefault();
return factory;
}
