/// <inheritdoc/>
        public override string SelectAction(ODataPath odataPath, HttpControllerContext controllerContext,
                                            ILookup <string, HttpActionDescriptor> actionMap)
        {
            if (odataPath == null)
            {
                throw Error.ArgumentNull("odataPath");
            }

            if (controllerContext == null)
            {
                throw Error.ArgumentNull("controllerContext");
            }

            if (actionMap == null)
            {
                throw Error.ArgumentNull("actionMap");
            }

            if (controllerContext.Request.Method == HttpMethod.Get)
            {
                string actionName = null;
                switch (odataPath.PathTemplate)
                {
                case "~/entityset/key/cast/function":
                case "~/entityset/key/function":
                    actionName = GetFunction(odataPath).SelectAction(actionMap, isCollection: false);
                    if (actionName != null)
                    {
                        controllerContext.AddKeyValueToRouteData(odataPath);
                    }
                    break;

                case "~/entityset/cast/function":
                case "~/entityset/function":
                    actionName = GetFunction(odataPath).SelectAction(actionMap, isCollection: true);
                    break;

                case "~/singleton/function":
                case "~/singleton/cast/function":
                    actionName = GetFunction(odataPath).SelectAction(actionMap, isCollection: false);
                    break;
                }

                if (actionName != null)
                {
                    controllerContext.AddFunctionParameterToRouteData(odataPath.Segments.Last() as BoundFunctionPathSegment);
                    return(actionName);
                }
            }

            return(null);
        }
        /// <inheritdoc/>
        public override string SelectAction(ODataPath odataPath, HttpControllerContext controllerContext,
                                            ILookup <string, HttpActionDescriptor> actionMap)
        {
            if (odataPath == null)
            {
                throw Error.ArgumentNull("odataPath");
            }

            if (controllerContext == null)
            {
                throw Error.ArgumentNull("controllerContext");
            }

            if (actionMap == null)
            {
                throw Error.ArgumentNull("actionMap");
            }

            if (controllerContext.Request.Method == HttpMethod.Get)
            {
                string actionName = null;
                BoundFunctionPathSegment function = null;
                switch (odataPath.PathTemplate)
                {
                case "~/entityset/key/cast/function":
                case "~/entityset/key/function":
                    function   = odataPath.Segments.Last() as BoundFunctionPathSegment;
                    actionName = GetFunction(function).SelectAction(actionMap, isCollection: false);
                    if (actionName != null)
                    {
                        EntitySetPathSegment entitySetPathSegment = (EntitySetPathSegment)odataPath.Segments.First();
                        IEdmEntityType       edmEntityType        = entitySetPathSegment.EntitySetBase.EntityType();
                        KeyValuePathSegment  keyValueSegment      = (KeyValuePathSegment)odataPath.Segments[1];

                        controllerContext.AddKeyValueToRouteData(keyValueSegment, edmEntityType, ODataRouteConstants.Key);
                    }
                    break;

                case "~/entityset/key/cast/function/$count":
                case "~/entityset/key/function/$count":
                    function   = odataPath.Segments[odataPath.Segments.Count - 2] as BoundFunctionPathSegment;
                    actionName = GetFunction(function).SelectAction(actionMap, isCollection: false);
                    if (actionName != null)
                    {
                        EntitySetPathSegment entitySetPathSegment = (EntitySetPathSegment)odataPath.Segments.First();
                        IEdmEntityType       edmEntityType        = entitySetPathSegment.EntitySetBase.EntityType();
                        KeyValuePathSegment  keyValueSegment      = (KeyValuePathSegment)odataPath.Segments[1];

                        controllerContext.AddKeyValueToRouteData(keyValueSegment, edmEntityType, ODataRouteConstants.Key);
                    }
                    break;

                case "~/entityset/cast/function":
                case "~/entityset/function":
                    function   = odataPath.Segments.Last() as BoundFunctionPathSegment;
                    actionName = GetFunction(function).SelectAction(actionMap, isCollection: true);
                    break;

                case "~/entityset/cast/function/$count":
                case "~/entityset/function/$count":
                    function   = odataPath.Segments[odataPath.Segments.Count - 2] as BoundFunctionPathSegment;
                    actionName = GetFunction(function).SelectAction(actionMap, isCollection: true);
                    break;

                case "~/singleton/function":
                case "~/singleton/cast/function":
                    function   = odataPath.Segments.Last() as BoundFunctionPathSegment;
                    actionName = GetFunction(function).SelectAction(actionMap, isCollection: false);
                    break;

                case "~/singleton/function/$count":
                case "~/singleton/cast/function/$count":
                    function   = odataPath.Segments[odataPath.Segments.Count - 2] as BoundFunctionPathSegment;
                    actionName = GetFunction(function).SelectAction(actionMap, isCollection: false);
                    break;
                }

                if (actionName != null)
                {
                    controllerContext.AddFunctionParameterToRouteData(function);
                    return(actionName);
                }
            }

            return(null);
        }