class/System/System.ComponentModel.Design.Serialization/MemberRelationship.cs

   1 //
   2 // System.ComponentModel.Design.Serialization.MemberRelationship
   3 //
   4 // Authors:
   5 //        Ivan N. Zlatev (contact@i-nZ.net)
   6 //
   7 // (C) 2007 Ivan N. Zlatev
   8
   9 //
  10 // Permission is hereby granted, free of charge, to any person obtaining
  11 // a copy of this software and associated documentation files (the
  12 // "Software"), to deal in the Software without restriction, including
  13 // without limitation the rights to use, copy, modify, merge, publish,
  14 // distribute, sublicense, and/or sell copies of the Software, and to
  15 // permit persons to whom the Software is furnished to do so, subject to
  16 // the following conditions:
  17 //
  18 // The above copyright notice and this permission notice shall be
  19 // included in all copies or substantial portions of the Software.
  20 //
  21 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  22 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  23 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  24 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  25 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  26 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  27 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  28 //
  29
  30 #if NET_2_0
  31
  32 using System;
  33 using System.CodeDom;
  34 using System.ComponentModel;
  35
  36 namespace System.ComponentModel.Design.Serialization
  37 {
  38         public struct MemberRelationship
  39         {
  40
  41                 public static readonly MemberRelationship Empty = new MemberRelationship ();
  42
  43                 private object _owner;
  44                 private MemberDescriptor _member;
  45
  46                 public MemberRelationship (object owner, MemberDescriptor member)
  47                 {
  48                         _owner = owner;
  49                         _member = member;
  50                 }
  51
  52                 public bool IsEmpty {
  53                         get { return (_owner == null); }
  54                 }
  55
  56                 public object Owner {
  57                         get { return _owner; }
  58                 }
  59
  60                 public MemberDescriptor Member {
  61                         get { return _member; }
  62                 }
  63
  64                 public static bool operator == (MemberRelationship left, MemberRelationship right)
  65                 {
  66                         if (left.Owner == right.Owner && left.Member == right.Member)
  67                                 return true;
  68                         else
  69                                 return false;
  70                 }
  71
  72                 public static bool operator != (MemberRelationship left, MemberRelationship right)
  73                 {
  74                         return !(left == right);
  75                 }
  76
  77                 public override int GetHashCode ()
  78                 {
  79                         if (_owner != null && _member != null)
  80                                 return _member.GetHashCode () ^ _owner.GetHashCode ();
  81                         return base.GetHashCode ();
  82                 }
  83
  84                 public override bool Equals (object o)
  85                 {
  86                         if (o is MemberRelationship) {
  87                                 return ((MemberRelationship)o) == this;
  88                         }
  89                         return false;
  90                 }
  91         }
  92 }
  93 #endif