mcs/class/corlib/Mono.Globalization.Unicode/SortKey.cs

   1 //
   2 // System.Globalization.SortKey.cs
   3 //
   4 // Author:
   5 //      Atsushi Enomoto  <atsushi@ximian.com>
   6 //
   7 // Copyright (C) 2005 Novell, Inc (http://www.novell.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28
  29 //
  30 // This file works with our managed collation implementation.
  31 //
  32
  33 using System;
  34 using System.IO;
  35 using System.Globalization;
  36
  37 namespace System.Globalization
  38 {
  39         [System.Runtime.InteropServices.ComVisible (true)]
  40         [Serializable]
  41         public class SortKey
  42         {
  43                 #region Static members
  44                 public static int Compare (SortKey sortkey1, SortKey sortkey2)
  45                 {
  46                         if (sortkey1 == null)
  47                                 throw new ArgumentNullException ("sortkey1");
  48                         if (sortkey2 == null)
  49                                 throw new ArgumentNullException ("sortkey2");
  50
  51                         if (Object.ReferenceEquals (sortkey1, sortkey2)
  52                                 || Object.ReferenceEquals (sortkey1.OriginalString,
  53                                 sortkey2.OriginalString))
  54                                 return 0;
  55
  56                         byte [] d1 = sortkey1.KeyData;
  57                         byte [] d2 = sortkey2.KeyData;
  58
  59                         int len = d1.Length > d2.Length ? d2.Length : d1.Length;
  60                         for (int i = 0; i < len; i++)
  61                                 if (d1 [i] != d2 [i])
  62                                         return d1 [i] < d2 [i] ? -1 : 1;
  63                         return d1.Length == d2.Length ? 0 : d1.Length < d2.Length ? -1 : 1;
  64                 }
  65                 #endregion
  66
  67                 readonly string source;
  68                 readonly CompareOptions options;
  69                 readonly byte [] key;
  70                 readonly int lcid;
  71
  72                 // for legacy unmanaged one
  73                 internal SortKey (int lcid, string source, CompareOptions opt)
  74                 {
  75                         this.lcid = lcid;
  76                         this.source = source;
  77                         this.options = opt;
  78                 }
  79
  80                 internal SortKey (int lcid, string source, byte [] buffer, CompareOptions opt,
  81                         int lv1Length, int lv2Length, int lv3Length,
  82                         int kanaSmallLength, int markTypeLength,
  83                         int katakanaLength, int kanaWidthLength,
  84                         int identLength)
  85                 {
  86                         this.lcid = lcid;
  87                         this.source = source;
  88                         this.key = buffer;
  89                         this.options = opt;
  90                 }
  91
  92                 public virtual string OriginalString {
  93                         get { return source; }
  94                 }
  95
  96                 public virtual byte [] KeyData {
  97                         get { return key; }
  98                 }
  99
 100                 // copy from original SortKey.cs
 101                 public override bool Equals (object value)
 102                 {
 103                         SortKey other = (value as SortKey);
 104                         if (other != null) {
 105                                 if ((this.lcid == other.lcid) &&
 106                                    (this.options == other.options) &&
 107                                    (Compare (this, other) == 0)) {
 108                                         return true;
 109                                 }
 110                         }
 111
 112                         return false;
 113                 }
 114
 115                 public override int GetHashCode ()
 116                 {
 117                         if (key.Length == 0)
 118                                 return 0; // should not happen though.
 119                         int val = key [0];
 120                         for (int i = 1; i < key.Length; i++)
 121                                 val ^= (int) key [i] << (i & 3);
 122                         return (int) val;
 123                 }
 124
 125                 // copy from original SortKey.cs
 126                 public override string ToString()
 127                 {
 128                         return "SortKey - " + lcid + ", " + options + ", " + source;
 129                 }
 130         }
 131 }