class/System/System.ComponentModel/ReadOnlyAttribute.cs

   1 //
   2 // System.ComponentModel.ReadOnlyAttribute.cs
   3 //
   4 // Author:
   5 //   Chris J Breisch (cjbreisch@altavista.net)
   6 //
   7 // (C) 2002 Chris J Breisch
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30 namespace System.ComponentModel {
  31         [AttributeUsage (AttributeTargets.All)]
  32         sealed public class ReadOnlyAttribute : Attribute {
  33                 bool read_only;
  34
  35                 public static readonly ReadOnlyAttribute No;
  36                 public static readonly ReadOnlyAttribute Yes;
  37                 public static readonly ReadOnlyAttribute Default;
  38
  39                 static ReadOnlyAttribute ()
  40                 {
  41                         No = new ReadOnlyAttribute (false);
  42                         Yes = new ReadOnlyAttribute (true);
  43                         Default = new ReadOnlyAttribute (false);
  44                 }
  45
  46                 public ReadOnlyAttribute (bool read_only)
  47                 {
  48                         this.read_only = read_only;
  49                 }
  50
  51                 public bool IsReadOnly {
  52                         get {
  53                                 return read_only;
  54                         }
  55                 }
  56
  57                 public override int GetHashCode ()
  58                 {
  59                         return read_only.GetHashCode ();
  60                 }
  61
  62                 public override bool Equals (object o)
  63                 {
  64                         if (!(o is ReadOnlyAttribute))
  65                                 return false;
  66
  67                         return (((ReadOnlyAttribute) o).IsReadOnly.Equals (read_only));
  68                 }
  69
  70                 public override bool IsDefaultAttribute ()
  71                 {
  72                         return Equals (Default);
  73                 }
  74         }
  75 }