Components/DictionaryAdapter/Castle.Components.DictionaryAdapter/Attributes/DictionaryComponentAttribute.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.Components.DictionaryAdapter
  16 {
  17         using System;
  18         using System.Collections;
  19
  20         /// <summary>
  21         /// Identifies a property should be represented as a nested component.
  22         /// </summary>
  23         [AttributeUsage(AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
  24         public class DictionaryComponentAttribute :
  25                 DictionaryBehaviorAttribute, IDictionaryKeyBuilder, IDictionaryPropertyGetter
  26         {
  27                 private String prefix;
  28
  29                 /// <summary>
  30                 /// Applies no prefix.
  31                 /// </summary>
  32                 public bool NoPrefix
  33                 {
  34                         get { return prefix == ""; }
  35                         set
  36                         {
  37                                 if (value)
  38                                 {
  39                                         Prefix = "";
  40                                 }
  41                         }
  42                 }
  43
  44                 /// <summary>
  45                 /// Gets or sets the prefix.
  46                 /// </summary>
  47                 /// <value>The prefix.</value>
  48                 public string Prefix
  49                 {
  50                         get { return prefix; }
  51                         set { prefix = value; }
  52                 }
  53
  54                 #region IDictionaryKeyBuilder Members
  55
  56                 string IDictionaryKeyBuilder.GetKey(IDictionary dictionary, string key,
  57                                                    PropertyDescriptor property)
  58                 {
  59                         return prefix ?? key + "_";
  60                 }
  61
  62                 #endregion
  63
  64                 #region IDictionaryPropertyGetter
  65
  66                 object IDictionaryPropertyGetter.GetPropertyValue(
  67                         IDictionaryAdapterFactory factory, IDictionary dictionary,
  68                         string key, object storedValue, PropertyDescriptor property)
  69                 {
  70                         if (storedValue == null)
  71                         {
  72                                 PropertyDescriptor descriptor =
  73                                         new PropertyDescriptor(property.Property);
  74                                 descriptor.AddKeyBuilder(new DictionaryKeyPrefixAttribute(key));
  75
  76                                 return factory.GetAdapter(
  77                                         property.Property.PropertyType, dictionary, descriptor);
  78                         }
  79
  80                         return storedValue;
  81                 }
  82
  83                 #endregion
  84         }
  85 }