MonoRail/Castle.MonoRail.Framework/Providers/DefaultLayoutDescriptorProvider.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.Framework.Providers
  16 {
  17         using System.Reflection;
  18         using Castle.Core.Logging;
  19         using Castle.MonoRail.Framework.Descriptors;
  20
  21         /// <summary>
  22         /// Creates <see cref="LayoutDescriptor"/> from attributes
  23         /// associated with the <see cref="IController"/> and its actions
  24         /// </summary>
  25         public class DefaultLayoutDescriptorProvider : ILayoutDescriptorProvider
  26         {
  27                 /// <summary>
  28                 /// The logger instance
  29                 /// </summary>
  30                 private ILogger logger = NullLogger.Instance;
  31
  32                 #region IMRServiceEnabled implementation
  33
  34                 /// <summary>
  35                 /// Invoked by the framework in order to give a chance to
  36                 /// obtain other services
  37                 /// </summary>
  38                 /// <param name="provider">The service proviver</param>
  39                 public void Service(IMonoRailServices provider)
  40                 {
  41                         ILoggerFactory loggerFactory = (ILoggerFactory) provider.GetService(typeof(ILoggerFactory));
  42
  43                         if (loggerFactory != null)
  44                         {
  45                                 logger = loggerFactory.Create(typeof(DefaultLayoutDescriptorProvider));
  46                         }
  47                 }
  48
  49                 #endregion
  50
  51                 /// <summary>
  52                 /// Implementors should collect the layout information
  53                 /// and return a descriptor instance, or null if none
  54                 /// was found.
  55                 /// </summary>
  56                 /// <param name="memberInfo">The controller type or action (MethodInfo)</param>
  57                 /// <returns>
  58                 /// An <see cref="LayoutDescriptor"/> instance
  59                 /// </returns>
  60                 public LayoutDescriptor CollectLayout(MemberInfo memberInfo)
  61                 {
  62                         if (logger.IsDebugEnabled)
  63                         {
  64                                 logger.DebugFormat("Collecting layout information for {0}", memberInfo.Name);
  65                         }
  66
  67                         object[] attributes = memberInfo.GetCustomAttributes(typeof(ILayoutDescriptorBuilder), true);
  68
  69                         if (attributes.Length == 1)
  70                         {
  71                                 LayoutDescriptor desc = (attributes[0] as ILayoutDescriptorBuilder).BuildLayoutDescriptor();
  72
  73                                 return desc;
  74                         }
  75
  76                         return null;
  77                 }
  78         }
  79 }