2005-08-04 Atsushi Enomoto <atsushi@ximian.com>
[mono.git] / mcs / class / corlib / Mono.Globalization.Unicode / SortKey.cs
1 //
2 // 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         public class SortKey
40         {
41                 #region Static members
42                 public static int Compare (SortKey sk1, SortKey sk2)
43                 {
44                         if (Object.ReferenceEquals (sk1, sk2)
45                                 || Object.ReferenceEquals (sk1.OriginalString,
46                                 sk2.OriginalString))
47                                 return 0;
48
49                         byte [] d1 = sk1.KeyData;
50                         byte [] d2 = sk2.KeyData;
51
52                         int len = d1.Length > d2.Length ? d2.Length : d1.Length;
53                         for (int i = 0; i < len; i++)
54                                 if (d1 [i] != d2 [i])
55                                         return d1 [i] < d2 [i] ? -1 : 1;
56                         return d1.Length == d2.Length ? 0 : d1.Length < d2.Length ? -1 : 1;
57                 }
58                 #endregion
59
60                 readonly string source;
61                 readonly CompareOptions options;
62                 readonly byte [] key;
63                 readonly int lcid;
64
65                 // for legacy unmanaged one
66                 internal SortKey (int lcid, string source, CompareOptions opt)
67                 {
68                         this.lcid = lcid;
69                         this.source = source;
70                         this.options = opt;
71                 }
72
73                 internal SortKey (int lcid, string source, byte [] buffer, CompareOptions opt,
74                         int lv1Length, int lv2Length, int lv3Length,
75                         int kanaSmallLength, int markTypeLength,
76                         int katakanaLength, int kanaWidthLength,
77                         int identLength)
78                 {
79                         this.lcid = lcid;
80                         this.source = source;
81                         this.key = buffer;
82                         this.options = opt;
83                 }
84
85                 public string OriginalString {
86                         get { return source; }
87                 }
88
89                 public byte [] KeyData {
90                         get { return key; }
91                 }
92
93                 // copy from original SortKey.cs
94                 public override bool Equals (object value)
95                 {
96                         SortKey other = (value as SortKey);
97                         if(other!=null) {
98                                 if((this.lcid==other.lcid) &&
99                                    (this.options==other.options) &&
100                                    (Compare (this, other)==0)) {
101                                         return(true);
102                                 }
103                         }
104
105                         return(false);
106                 }
107
108                 public override int GetHashCode ()
109                 {
110                         if (key.Length == 0)
111                                 return 0; // should not happen though.
112                         int val = key [0];
113                         for (int i = 1; i < key.Length; i++)
114                                 val ^= (int) key [i] << (i & 3);
115                         return (int) val;
116                 }
117
118                 // copy from original SortKey.cs
119                 public override string ToString()
120                 {
121                         return("SortKey - "+lcid+", "+options+", "+source);
122                 }
123         }
124 }