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                 private readonly TypeConverter converter;
  27
  28                 /// <summary>
  29                 /// Singleton instance of <see cref="DefaultPropertyGetter"/>
  30                 /// </summary>
  31                 public static readonly DefaultPropertyGetter
  32                         Instance = new DefaultPropertyGetter();
  33
  34                 /// <summary>
  35                 /// Initializes a new instance of the <see cref="DefaultPropertyGetter"/> class.
  36                 /// </summary>
  37                 public DefaultPropertyGetter()
  38                 {
  39                 }
  40
  41                 /// <summary>
  42                 /// Initializes a new instance of the <see cref="DefaultPropertyGetter"/> class.
  43                 /// </summary>
  44                 /// <param name="converter">The converter.</param>
  45                 public DefaultPropertyGetter(TypeConverter converter)
  46                 {
  47                         this.converter = converter;
  48                 }
  49
  50                 /// <summary>
  51                 /// Gets the effective dictionary value.
  52                 /// </summary>
  53                 /// <param name="factory">The dictionary factory.</param>
  54                 /// <param name="dictionary">The dictionary.</param>
  55                 /// <param name="key">The key.</param>
  56                 /// <param name="storedValue">The stored value.</param>
  57                 /// <param name="property">The property.</param>
  58                 /// <returns>The effective property value.</returns>
  59                 public object GetPropertyValue(IDictionaryAdapterFactory factory,
  60                                                IDictionary dictionary, string key,
  61                                                object storedValue, PropertyDescriptor property)
  62                 {
  63                         Type propertyType = property.PropertyType;
  64
  65                         if (storedValue != null && !propertyType.IsInstanceOfType(storedValue))
  66                         {
  67                                 TypeConverter conv = converter ?? TypeDescriptor.GetConverter(propertyType);
  68                                 if (conv != null && conv.CanConvertFrom(storedValue.GetType()))
  69                                 {
  70                                         return conv.ConvertFrom(storedValue);
  71                                 }
  72                         }
  73
  74                         return storedValue;
  75                 }
  76         }
  77 }