internal static void AddRouteEntries(SubRouteCollection collector, IEnumerable<Type> controllerTypes,
            IInlineConstraintResolver constraintResolver, IDirectRouteProvider directRouteProvider)
        {
            IEnumerable<ReflectedAsyncControllerDescriptor> controllers = GetControllerDescriptors(controllerTypes);

            foreach (ReflectedAsyncControllerDescriptor controller in controllers)
            {
                List<ActionDescriptor> actions = GetActionDescriptors(controller);

                IReadOnlyCollection<RouteEntry> entries = directRouteProvider.GetDirectRoutes(controller, actions, constraintResolver);
                if (entries == null)
                {
                    throw Error.InvalidOperation(
                        MvcResources.TypeMethodMustNotReturnNull,
                        typeof(IDirectRouteProvider).Name, 
                        "GetDirectRoutes");
                }

                foreach (RouteEntry entry in entries)
                {
                    if (entry == null)
                    {
                        throw Error.InvalidOperation(
                            MvcResources.TypeMethodMustNotReturnNull,
                            typeof(IDirectRouteProvider).Name, 
                            "GetDirectRoutes");
                    }

                    DirectRouteBuilder.ValidateRouteEntry(entry);

                    // This marks the action/controller as unreachable via traditional routing.
                    if (entry.Route.GetTargetIsAction())
                    {
                        var actionDescriptors = entry.Route.GetTargetActionDescriptors();
                        Contract.Assert(actionDescriptors != null && actionDescriptors.Any());

                        foreach (var actionDescriptor in actionDescriptors.OfType<IMethodInfoActionDescriptor>())
                        {
                            var methodInfo = actionDescriptor.MethodInfo;
                            if (methodInfo != null)
                            {
                                controller.Selector.StandardRouteMethods.Remove(methodInfo);
                            }
                        }
                    }
                    else
                    {
                        // This is a controller-level route - no actions in this controller are reachable via
                        // traditional routes.
                        controller.Selector.StandardRouteMethods.Clear();
                    }
                }

                collector.AddRange(entries);
            }
        }
        private static void AddRouteEntries(
            SubRouteCollection collector,
            HttpConfiguration configuration,
            IInlineConstraintResolver constraintResolver,
            IDirectRouteProvider directRouteProvider)
        {
            Contract.Assert(configuration != null);
            Contract.Assert(directRouteProvider != null);

            IHttpControllerSelector controllerSelector = configuration.Services.GetHttpControllerSelector();
            IDictionary <string, HttpControllerDescriptor> controllerMap = controllerSelector.GetControllerMapping();

            if (controllerMap != null)
            {
                foreach (HttpControllerDescriptor controllerDescriptor in controllerMap.Values)
                {
                    IHttpActionSelector actionSelector = controllerDescriptor.Configuration.Services.GetActionSelector();

                    ILookup <string, HttpActionDescriptor> actionsByName =
                        actionSelector.GetActionMapping(controllerDescriptor);
                    if (actionsByName == null)
                    {
                        continue;
                    }

                    List <HttpActionDescriptor>      actions    = actionsByName.SelectMany(g => g).ToList();
                    IReadOnlyCollection <RouteEntry> newEntries =
                        directRouteProvider.GetDirectRoutes(controllerDescriptor, actions, constraintResolver);
                    if (newEntries == null)
                    {
                        throw Error.InvalidOperation(
                                  SRResources.TypeMethodMustNotReturnNull,
                                  typeof(IDirectRouteProvider).Name, "GetDirectRoutes");
                    }

                    foreach (RouteEntry entry in newEntries)
                    {
                        if (entry == null)
                        {
                            throw Error.InvalidOperation(
                                      SRResources.TypeMethodMustNotReturnNull,
                                      typeof(IDirectRouteProvider).Name, "GetDirectRoutes");
                        }

                        DirectRouteBuilder.ValidateRouteEntry(entry);

                        // We need to mark each action as only reachable by direct routes so that traditional routes
                        // don't accidentally hit them.
                        HttpControllerDescriptor routeControllerDescriptor = entry.Route.GetTargetControllerDescriptor();
                        if (routeControllerDescriptor == null)
                        {
                            HttpActionDescriptor[] actionDescriptors = entry.Route.GetTargetActionDescriptors();
                            foreach (var actionDescriptor in actionDescriptors)
                            {
                                actionDescriptor.SetIsAttributeRouted(true);
                            }
                        }
                        else
                        {
                            routeControllerDescriptor.SetIsAttributeRouted(true);
                        }
                    }

                    collector.AddRange(newEntries);
                }
            }
        }
        private static void AddRouteEntries(
            SubRouteCollection collector, 
            HttpConfiguration configuration,
            IInlineConstraintResolver constraintResolver,
            IDirectRouteProvider directRouteProvider)
        {
            Contract.Assert(configuration != null);
            Contract.Assert(directRouteProvider != null);

            IHttpControllerSelector controllerSelector = configuration.Services.GetHttpControllerSelector();
            IDictionary<string, HttpControllerDescriptor> controllerMap = controllerSelector.GetControllerMapping();
            if (controllerMap != null)
            {
                foreach (HttpControllerDescriptor controllerDescriptor in controllerMap.Values)
                {
                    IHttpActionSelector actionSelector = controllerDescriptor.Configuration.Services.GetActionSelector();

                    ILookup<string, HttpActionDescriptor> actionsByName =
                        actionSelector.GetActionMapping(controllerDescriptor);
                    if (actionsByName == null)
                    {
                        continue;
                    }

                    List<HttpActionDescriptor> actions = actionsByName.SelectMany(g => g).ToList();
                    IReadOnlyCollection<RouteEntry> newEntries =
                        directRouteProvider.GetDirectRoutes(controllerDescriptor, actions, constraintResolver);
                    if (newEntries == null)
                    {
                        throw Error.InvalidOperation(
                            SRResources.TypeMethodMustNotReturnNull,
                            typeof(IDirectRouteProvider).Name, "GetDirectRoutes");
                    }

                    foreach (RouteEntry entry in newEntries)
                    {
                        if (entry == null)
                        {
                            throw Error.InvalidOperation(
                                SRResources.TypeMethodMustNotReturnNull,
                                typeof(IDirectRouteProvider).Name, "GetDirectRoutes");
                        }

                        DirectRouteBuilder.ValidateRouteEntry(entry);

                        // We need to mark each action as only reachable by direct routes so that traditional routes
                        // don't accidentally hit them.
                        HttpControllerDescriptor routeControllerDescriptor = entry.Route.GetTargetControllerDescriptor();
                        if (routeControllerDescriptor == null)
                        {
                            HttpActionDescriptor[] actionDescriptors = entry.Route.GetTargetActionDescriptors();
                            foreach (var actionDescriptor in actionDescriptors)
                            {
                                actionDescriptor.SetIsAttributeRouted(true);
                            }
                        }
                        else
                        {
                            routeControllerDescriptor.SetIsAttributeRouted(true);
                        }                        
                    }

                    collector.AddRange(newEntries);
                }
            }
        }