Components/DictionaryAdapter/Castle.Components.DictionaryAdapter/CascadingAdapter.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.Collections;
  18
  19         public class CascadingAdapter : AbstractDictionaryAdapter
  20         {
  21                 private readonly IDictionary primary;
  22                 private readonly IDictionary secondary;
  23
  24                 public CascadingAdapter(IDictionary primary, IDictionary secondary)
  25                 {
  26                         this.primary = primary;
  27                         this.secondary = secondary;
  28                 }
  29
  30                 public override bool IsReadOnly
  31                 {
  32                         get { return primary.IsReadOnly; }
  33                 }
  34
  35                 public override bool Contains(object key)
  36                 {
  37                         return primary.Contains(key) || secondary.Contains(key);
  38                 }
  39
  40                 public override object this[object key]
  41                 {
  42                         get { return primary[key] ?? secondary[key]; }
  43                         set { primary[key] = value; }
  44                 }
  45         }
  46 }