InversionOfControl/Castle.MicroKernel/Util/ReferenceComparer.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.MicroKernel.Util
  16 {
  17         using System;
  18         using System.Collections;
  19
  20         /// <summary>
  21         /// Compares if the reference of two objects are equals.
  22         /// </summary>
  23         [Serializable]
  24         public class ReferenceComparer : IComparer
  25         {
  26                 public ReferenceComparer()
  27                 {
  28                 }
  29
  30                 public int Compare(object x, object y)
  31                 {
  32                         return object.ReferenceEquals(x, y) ? 0 : 1;
  33                 }
  34         }
  35
  36         [Serializable]
  37         public class ReferenceEqualityComparer : IEqualityComparer
  38         {
  39                 public new bool Equals(object x, object y)
  40                 {
  41                         return ReferenceEquals(x, y);
  42                 }
  43
  44                 public int GetHashCode(object obj)
  45                 {
  46                         if (obj == null)
  47                         {
  48                                 throw new ArgumentNullException("obj");
  49                         }
  50                         return obj.GetHashCode();
  51                 }
  52         }
  53 }