class/System.Web.Mvc/System.Web.Mvc/ReflectedControllerDescriptor.cs

   1 /* ****************************************************************************
   2  *
   3  * Copyright (c) Microsoft Corporation. All rights reserved.
   4  *
   5  * This software is subject to the Microsoft Public License (Ms-PL).
   6  * A copy of the license can be found in the license.htm file included
   7  * in this distribution.
   8  *
   9  * You must not remove this notice, or any other, from this software.
  10  *
  11  * ***************************************************************************/
  12
  13 namespace System.Web.Mvc {
  14     using System;
  15     using System.Collections.Generic;
  16     using System.Linq;
  17     using System.Reflection;
  18     using System.Web.Mvc.Resources;
  19
  20     public class ReflectedControllerDescriptor : ControllerDescriptor {
  21
  22         private ActionDescriptor[] _canonicalActionsCache;
  23         private readonly Type _controllerType;
  24         private readonly ActionMethodSelector _selector;
  25
  26         public ReflectedControllerDescriptor(Type controllerType) {
  27             if (controllerType == null) {
  28                 throw new ArgumentNullException("controllerType");
  29             }
  30
  31             _controllerType = controllerType;
  32             _selector = new ActionMethodSelector(_controllerType);
  33         }
  34
  35         public sealed override Type ControllerType {
  36             get {
  37                 return _controllerType;
  38             }
  39         }
  40
  41         public override ActionDescriptor FindAction(ControllerContext controllerContext, string actionName) {
  42             if (controllerContext == null) {
  43                 throw new ArgumentNullException("controllerContext");
  44             }
  45             if (String.IsNullOrEmpty(actionName)) {
  46                 throw new ArgumentException(MvcResources.Common_NullOrEmpty, "actionName");
  47             }
  48
  49             MethodInfo matched = _selector.FindActionMethod(controllerContext, actionName);
  50             if (matched == null) {
  51                 return null;
  52             }
  53
  54             return new ReflectedActionDescriptor(matched, actionName, this);
  55         }
  56
  57         private MethodInfo[] GetAllActionMethodsFromSelector() {
  58             List<MethodInfo> allValidMethods = new List<MethodInfo>();
  59             allValidMethods.AddRange(_selector.AliasedMethods);
  60             allValidMethods.AddRange(_selector.NonAliasedMethods.SelectMany(g => g));
  61             return allValidMethods.ToArray();
  62         }
  63
  64         public override ActionDescriptor[] GetCanonicalActions() {
  65             ActionDescriptor[] actions = LazilyFetchCanonicalActionsCollection();
  66
  67             // need to clone array so that user modifications aren't accidentally stored
  68             return (ActionDescriptor[])actions.Clone();
  69         }
  70
  71         public override object[] GetCustomAttributes(bool inherit) {
  72             return ControllerType.GetCustomAttributes(inherit);
  73         }
  74
  75         public override object[] GetCustomAttributes(Type attributeType, bool inherit) {
  76             return ControllerType.GetCustomAttributes(attributeType, inherit);
  77         }
  78
  79         public override bool IsDefined(Type attributeType, bool inherit) {
  80             return ControllerType.IsDefined(attributeType, inherit);
  81         }
  82
  83         private ActionDescriptor[] LazilyFetchCanonicalActionsCollection() {
  84             return DescriptorUtil.LazilyFetchOrCreateDescriptors<MethodInfo, ActionDescriptor>(
  85                 ref _canonicalActionsCache /* cacheLocation */,
  86                 GetAllActionMethodsFromSelector /* initializer */,
  87                 methodInfo => ReflectedActionDescriptor.TryCreateDescriptor(methodInfo, methodInfo.Name, this) /* converter */);
  88         }
  89
  90     }
  91 }