/mcs/class/System.Web.Mvc/System.Web.Mvc/ActionMethodSelector.cs
C# | 125 lines | 86 code | 22 blank | 17 comment | 5 complexity | eac19e8026324672d64301fe1dc2ddf9 MD5 | raw file
Possible License(s): LGPL-2.0, MPL-2.0-no-copyleft-exception, CC-BY-SA-3.0, GPL-2.0, LGPL-2.1
- /* ****************************************************************************
- *
- * Copyright (c) Microsoft Corporation. All rights reserved.
- *
- * This software is subject to the Microsoft Public License (Ms-PL).
- * A copy of the license can be found in the license.htm file included
- * in this distribution.
- *
- * You must not remove this notice, or any other, from this software.
- *
- * ***************************************************************************/
- namespace System.Web.Mvc {
- using System;
- using System.Collections.Generic;
- using System.Globalization;
- using System.Linq;
- using System.Reflection;
- using System.Text;
- using System.Web.Mvc.Resources;
- internal sealed class ActionMethodSelector {
- public ActionMethodSelector(Type controllerType) {
- ControllerType = controllerType;
- PopulateLookupTables();
- }
- public Type ControllerType {
- get;
- private set;
- }
- public MethodInfo[] AliasedMethods {
- get;
- private set;
- }
- public ILookup<string, MethodInfo> NonAliasedMethods {
- get;
- private set;
- }
- private AmbiguousMatchException CreateAmbiguousMatchException(List<MethodInfo> ambiguousMethods, string actionName) {
- StringBuilder exceptionMessageBuilder = new StringBuilder();
- foreach (MethodInfo methodInfo in ambiguousMethods) {
- string controllerAction = Convert.ToString(methodInfo, CultureInfo.CurrentUICulture);
- string controllerType = methodInfo.DeclaringType.FullName;
- exceptionMessageBuilder.AppendLine();
- exceptionMessageBuilder.AppendFormat(CultureInfo.CurrentUICulture, MvcResources.ActionMethodSelector_AmbiguousMatchType, controllerAction, controllerType);
- }
- string message = String.Format(CultureInfo.CurrentUICulture, MvcResources.ActionMethodSelector_AmbiguousMatch,
- actionName, ControllerType.Name, exceptionMessageBuilder);
- return new AmbiguousMatchException(message);
- }
- public MethodInfo FindActionMethod(ControllerContext controllerContext, string actionName) {
- List<MethodInfo> methodsMatchingName = GetMatchingAliasedMethods(controllerContext, actionName);
- methodsMatchingName.AddRange(NonAliasedMethods[actionName]);
- List<MethodInfo> finalMethods = RunSelectionFilters(controllerContext, methodsMatchingName);
- switch (finalMethods.Count) {
- case 0:
- return null;
- case 1:
- return finalMethods[0];
- default:
- throw CreateAmbiguousMatchException(finalMethods, actionName);
- }
- }
- internal List<MethodInfo> GetMatchingAliasedMethods(ControllerContext controllerContext, string actionName) {
- // find all aliased methods which are opting in to this request
- // to opt in, all attributes defined on the method must return true
- var methods = from methodInfo in AliasedMethods
- let attrs = (ActionNameSelectorAttribute[])methodInfo.GetCustomAttributes(typeof(ActionNameSelectorAttribute), true /* inherit */)
- where attrs.All(attr => attr.IsValidName(controllerContext, actionName, methodInfo))
- select methodInfo;
- return methods.ToList();
- }
- private static bool IsMethodDecoratedWithAliasingAttribute(MethodInfo methodInfo) {
- return methodInfo.IsDefined(typeof(ActionNameSelectorAttribute), true /* inherit */);
- }
- private static bool IsValidActionMethod(MethodInfo methodInfo) {
- return !(methodInfo.IsSpecialName ||
- methodInfo.GetBaseDefinition().DeclaringType.IsAssignableFrom(typeof(Controller)));
- }
- private void PopulateLookupTables() {
- MethodInfo[] allMethods = ControllerType.GetMethods(BindingFlags.InvokeMethod | BindingFlags.Instance | BindingFlags.Public);
- MethodInfo[] actionMethods = Array.FindAll(allMethods, IsValidActionMethod);
- AliasedMethods = Array.FindAll(actionMethods, IsMethodDecoratedWithAliasingAttribute);
- NonAliasedMethods = actionMethods.Except(AliasedMethods).ToLookup(method => method.Name, StringComparer.OrdinalIgnoreCase);
- }
- private static List<MethodInfo> RunSelectionFilters(ControllerContext controllerContext, List<MethodInfo> methodInfos) {
- // remove all methods which are opting out of this request
- // to opt out, at least one attribute defined on the method must return false
- List<MethodInfo> matchesWithSelectionAttributes = new List<MethodInfo>();
- List<MethodInfo> matchesWithoutSelectionAttributes = new List<MethodInfo>();
- foreach (MethodInfo methodInfo in methodInfos) {
- ActionMethodSelectorAttribute[] attrs = (ActionMethodSelectorAttribute[])methodInfo.GetCustomAttributes(typeof(ActionMethodSelectorAttribute), true /* inherit */);
- if (attrs.Length == 0) {
- matchesWithoutSelectionAttributes.Add(methodInfo);
- }
- else if (attrs.All(attr => attr.IsValidForRequest(controllerContext, methodInfo))) {
- matchesWithSelectionAttributes.Add(methodInfo);
- }
- }
- // if a matching action method had a selection attribute, consider it more specific than a matching action method
- // without a selection attribute
- return (matchesWithSelectionAttributes.Count > 0) ? matchesWithSelectionAttributes : matchesWithoutSelectionAttributes;
- }
- }
- }