class/System.Windows/System.ComponentModel/SortDescription.cs

   1 // Permission is hereby granted, free of charge, to any person obtaining
   2 // a copy of this software and associated documentation files (the
   3 // "Software"), to deal in the Software without restriction, including
   4 // without limitation the rights to use, copy, modify, merge, publish,
   5 // distribute, sublicense, and/or sell copies of the Software, and to
   6 // permit persons to whom the Software is furnished to do so, subject to
   7 // the following conditions:
   8 //
   9 // The above copyright notice and this permission notice shall be
  10 // included in all copies or substantial portions of the Software.
  11 //
  12 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  13 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  14 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  15 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  16 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  17 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  18 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  19 //
  20 // Copyright (c) 2008 Novell, Inc. (http://www.novell.com)
  21 //
  22 // Authors:
  23 //      Chris Toshok (toshok@ximian.com)
  24 //      Brian O'Keefe (zer0keefie@gmail.com)
  25 //
  26
  27 using System;
  28
  29 namespace System.ComponentModel {
  30
  31         public struct SortDescription
  32         {
  33                 private string sortPropertyName;
  34                 private ListSortDirection sortDirection;
  35                 private bool isSealed;
  36
  37                 public SortDescription (string propertyName, ListSortDirection direction)
  38                 {
  39                         if(direction != ListSortDirection.Ascending && direction != ListSortDirection.Descending)
  40                                 throw new ArgumentException("direction");
  41
  42                         sortPropertyName = propertyName;
  43                         sortDirection = direction;
  44                         isSealed = false;
  45                 }
  46
  47                 public static bool operator!= (SortDescription sd1, SortDescription sd2)
  48                 {
  49                         return !(sd1 == sd2);
  50                 }
  51
  52                 public static bool operator== (SortDescription sd1, SortDescription sd2)
  53                 {
  54                         return sd1.sortDirection == sd2.sortDirection && sd1.sortPropertyName == sd2.sortPropertyName;
  55                 }
  56
  57                 public ListSortDirection Direction {
  58                         get { return sortDirection; }
  59                         set {
  60                                 if(isSealed)
  61                                         throw new InvalidOperationException("Cannot change Direction once the SortDescription has been sealed.");
  62
  63                                 if(value != ListSortDirection.Ascending && value != ListSortDirection.Descending)
  64                                         throw new ArgumentException("direction");
  65
  66                                 sortDirection = value;
  67                         }
  68                 }
  69
  70                 public bool IsSealed {
  71                         get { return isSealed; }
  72                 }
  73
  74                 public string PropertyName {
  75                         get { return sortPropertyName; }
  76                         set {
  77                                 if(isSealed)
  78                                         throw new InvalidOperationException("Cannot change Direction once the SortDescription has been sealed.");
  79
  80                                 sortPropertyName = value;
  81                         }
  82                 }
  83
  84                 public override bool Equals (object obj)
  85                 {
  86                         if (!(obj is SortDescription))
  87                                 return false;
  88                         return ((SortDescription)obj) == this;
  89                 }
  90
  91                 public override int GetHashCode ()
  92                 {
  93                         if(sortPropertyName == null)
  94                                 return sortDirection.GetHashCode ();
  95                         return sortPropertyName.GetHashCode () ^ sortDirection.GetHashCode ();
  96                 }
  97
  98                 internal void Seal()
  99                 {
 100                         isSealed = true;
 101                 }
 102         }
 103 }