Components/DictionaryAdapter/Castle.Components.DictionaryAdapter/DefaultPropertyGetter.cs

   1 // Copyright 2004-2007 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.Components.DictionaryAdapter
  16 {
  17         using System;
  18         using System.Collections;
  19         using System.ComponentModel;
  20
  21         /// <summary>
  22         /// Manages conversion between property values.
  23         /// </summary>
  24         public class DefaultPropertyGetter : IDictionaryPropertyGetter
  25         {
  26                 /// <summary>
  27                 /// Singleton instance of <see cref="DefaultPropertyGetter"/>
  28                 /// </summary>
  29                 public static readonly DefaultPropertyGetter
  30                         Instance = new DefaultPropertyGetter();
  31
  32                 private DefaultPropertyGetter()
  33                 {
  34                 }
  35
  36                 /// <summary>
  37                 /// Gets the effective dictionary value.
  38                 /// </summary>
  39                 /// <param name="factory">The dictionary factory.</param>
  40                 /// <param name="dictionary">The dictionary.</param>
  41                 /// <param name="key">The key.</param>
  42                 /// <param name="storedValue">The stored value.</param>
  43                 /// <param name="property">The property.</param>
  44                 /// <returns>The effective property value.</returns>
  45                 public object GetPropertyValue(IDictionaryAdapterFactory factory,
  46                                                IDictionary dictionary, string key,
  47                                                object storedValue, PropertyDescriptor property)
  48                 {
  49                         Type propertyType = property.Property.PropertyType;
  50
  51                         if (storedValue != null && !propertyType.IsInstanceOfType(storedValue))
  52                         {
  53                                 TypeConverter converter = TypeDescriptor.GetConverter(propertyType);
  54                                 if (converter != null && converter.CanConvertFrom(storedValue.GetType()))
  55                                 {
  56                                         return converter.ConvertFrom(storedValue);
  57                                 }
  58                         }
  59
  60                         return storedValue;
  61                 }
  62         }
  63 }