MonoRail/Castle.Monorail.JSONSupport/JSONBinderAttribute.cs

   1 // Copyright 2004-2006 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.JSONSupport
  16 {
  17         using System;
  18         using System.Reflection;
  19         using Castle.MonoRail.Framework;
  20         using Newtonsoft.Json;
  21
  22         /// <summary>
  23         /// Extends <see cref="DataBindAttribute"/> with
  24         /// the <see cref="JavaScriptConvert"/> functionality.
  25         /// </summary>
  26         [AttributeUsage(AttributeTargets.Parameter)]
  27         public class JSONBinderAttribute : Attribute, IParameterBinder
  28         {
  29                 private readonly string entryKey;
  30
  31                 /// <summary>
  32                 /// Initializes a new instance of the <see cref="JSONBinderAttribute"/> class.
  33                 /// </summary>
  34                 /// <param name="entryKey">The entry key, which is the form or
  35                 /// querystring key that identifies the JSON persisted content</param>
  36                 public JSONBinderAttribute(string entryKey)
  37                 {
  38                         if (entryKey == null) throw new ArgumentNullException("entryKey");
  39
  40                         this.entryKey = entryKey;
  41                 }
  42
  43                 public int CalculateParamPoints(SmartDispatcherController controller, ParameterInfo parameterInfo)
  44                 {
  45                         return controller.Params[entryKey] != null ? 1 : 0;
  46                 }
  47
  48                 public object Bind(SmartDispatcherController controller, ParameterInfo parameterInfo)
  49                 {
  50                         string entryValue = controller.Params[entryKey];
  51
  52                         return Bind(entryValue, parameterInfo.ParameterType);
  53                 }
  54
  55                 public static object Bind(string entryValue, Type parameterType)
  56                 {
  57                         return JavaScriptConvert.DeserializeObject(entryValue, parameterType);
  58                 }
  59         }
  60 }