mcs/class/System/System.ComponentModel/MergablePropertyAttribute.cs

   1 //
   2 // System.ComponentModel.MergablePropertyAttribute
   3 //
   4 // Authors:
   5 //  Martin Willemoes Hansen (mwh@sysrq.dk)
   6 //  Andreas Nahr (ClassDevelopment@A-SoftTech.com)
   7 //
   8 // (C) 2003 Martin Willemoes Hansen
   9 // (C) 2003 Andreas Nahr
  10 //
  11
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 namespace System.ComponentModel
  34 {
  35         [AttributeUsage(AttributeTargets.All)]
  36         public sealed class MergablePropertyAttribute : Attribute
  37         {
  38
  39                 private bool mergable;
  40
  41                 public static readonly MergablePropertyAttribute Default = new MergablePropertyAttribute (true);
  42                 public static readonly MergablePropertyAttribute No = new MergablePropertyAttribute (false);
  43                 public static readonly MergablePropertyAttribute Yes = new MergablePropertyAttribute (true);
  44
  45                 public MergablePropertyAttribute (bool allowMerge)
  46                 {
  47                         this.mergable = allowMerge;
  48                 }
  49
  50                 public bool AllowMerge {
  51                         get { return mergable; }
  52                 }
  53
  54                 public override bool Equals (object obj)
  55                 {
  56                         if (!(obj is MergablePropertyAttribute))
  57                                 return false;
  58                         if (obj == this)
  59                                 return true;
  60                         return ((MergablePropertyAttribute) obj).AllowMerge == mergable;
  61                 }
  62
  63                 public override int GetHashCode()
  64                 {
  65                         return mergable.GetHashCode ();
  66                 }
  67
  68                 public override bool IsDefaultAttribute()
  69                 {
  70                         return mergable == MergablePropertyAttribute.Default.AllowMerge;
  71                 }
  72         }
  73 }