MonoRail2/Castle.MonoRail/ControllerExecutor.cs

   1 // Copyright 2004-2008 Castle Project - http://www.castleproject.org/
   2 //
   3 // Licensed under the Apache License, Version 2.0 (the "License");
   4 // you may not use this file except in compliance with the License.
   5 // You may obtain a copy of the License at
   6 //
   7 //     http://www.apache.org/licenses/LICENSE-2.0
   8 //
   9 // Unless required by applicable law or agreed to in writing, software
  10 // distributed under the License is distributed on an "AS IS" BASIS,
  11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  12 // See the License for the specific language governing permissions and
  13 // limitations under the License.
  14
  15 namespace Castle.MonoRail
  16 {
  17         using System;
  18         using System.Reflection;
  19
  20         /// <summary>
  21         /// Manages the execution of the steps associated with
  22         /// a controller (filters/action/disposal).
  23         /// </summary>
  24         /// <remarks>
  25         /// This class is statefull.
  26         /// </remarks>
  27         public class ControllerExecutor
  28         {
  29                 private readonly object controller;
  30                 private readonly IExecutionContext executionContext;
  31
  32                 /// <summary>
  33                 /// Initializes a new instance of the <see cref="ControllerExecutor"/> class.
  34                 /// </summary>
  35                 /// <param name="controller">The controller.</param>
  36                 /// <param name="executionContext">The execution context.</param>
  37                 public ControllerExecutor(object controller, IExecutionContext executionContext)
  38                 {
  39                         if (controller == null) throw new ArgumentNullException("controller");
  40                         if (executionContext == null) throw new ArgumentNullException("executionContext");
  41
  42                         UrlInfo url = executionContext.OriginalUrl;
  43
  44                         IController properController = controller as IController;
  45
  46                         if (properController != null)
  47                         {
  48                                 properController.SetInitialState(url.Area, url.Controller, url.Action);
  49                         }
  50
  51                         this.controller = controller;
  52                         this.executionContext = executionContext;
  53                 }
  54
  55                 public ActionExecutor SelectAction()
  56                 {
  57                         return SelectAction(executionContext.OriginalUrl.Action);
  58                 }
  59
  60                 public ActionExecutor SelectAction(string actionName)
  61                 {
  62                         // There is room for a clever cache here
  63
  64                         // Right now let's support method action only
  65
  66                         BindingFlags flags = BindingFlags.IgnoreCase | BindingFlags.Public | BindingFlags.Instance;
  67
  68                         MethodInfo actionMethod = controller.GetType().GetMethod(actionName, flags);
  69
  70                         if (actionMethod != null)
  71                         {
  72                                 return new MethodActionExecutor(actionMethod);
  73                         }
  74
  75                         return null;
  76                 }
  77
  78                 public void Execute(ActionExecutor executor)
  79                 {
  80                         if (executor == null) throw new ArgumentNullException("executor");
  81
  82                         executor.Execute(controller);
  83                 }
  84         }
  85 }