svn path=/trunk/mcs/; revision=104772
[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         [Serializable]
40         public class SortKey
41         {
42                 #region Static members
43                 public static int Compare (SortKey sk1, SortKey sk2)
44                 {
45                         if (sk1 == null)
46                                 throw new ArgumentNullException ("sk1");
47                         if (sk2 == null)
48                                 throw new ArgumentNullException ("sk2");
49
50                         if (Object.ReferenceEquals (sk1, sk2)
51                                 || Object.ReferenceEquals (sk1.OriginalString,
52                                 sk2.OriginalString))
53                                 return 0;
54
55                         byte [] d1 = sk1.KeyData;
56                         byte [] d2 = sk2.KeyData;
57
58                         int len = d1.Length > d2.Length ? d2.Length : d1.Length;
59                         for (int i = 0; i < len; i++)
60                                 if (d1 [i] != d2 [i])
61                                         return d1 [i] < d2 [i] ? -1 : 1;
62                         return d1.Length == d2.Length ? 0 : d1.Length < d2.Length ? -1 : 1;
63                 }
64                 #endregion
65
66                 readonly string source;
67                 readonly CompareOptions options;
68                 readonly byte [] key;
69                 readonly int lcid;
70
71                 // for legacy unmanaged one
72                 internal SortKey (int lcid, string source, CompareOptions opt)
73                 {
74                         this.lcid = lcid;
75                         this.source = source;
76                         this.options = opt;
77                 }
78
79                 internal SortKey (int lcid, string source, byte [] buffer, CompareOptions opt,
80                         int lv1Length, int lv2Length, int lv3Length,
81                         int kanaSmallLength, int markTypeLength,
82                         int katakanaLength, int kanaWidthLength,
83                         int identLength)
84                 {
85                         this.lcid = lcid;
86                         this.source = source;
87                         this.key = buffer;
88                         this.options = opt;
89                 }
90
91                 public virtual string OriginalString {
92                         get { return source; }
93                 }
94
95                 public virtual byte [] KeyData {
96                         get { return key; }
97                 }
98
99                 // copy from original SortKey.cs
100                 public override bool Equals (object value)
101                 {
102                         SortKey other = (value as SortKey);
103                         if(other!=null) {
104                                 if((this.lcid==other.lcid) &&
105                                    (this.options==other.options) &&
106                                    (Compare (this, other)==0)) {
107                                         return(true);
108                                 }
109                         }
110
111                         return(false);
112                 }
113
114                 public override int GetHashCode ()
115                 {
116                         if (key.Length == 0)
117                                 return 0; // should not happen though.
118                         int val = key [0];
119                         for (int i = 1; i < key.Length; i++)
120                                 val ^= (int) key [i] << (i & 3);
121                         return (int) val;
122                 }
123
124                 // copy from original SortKey.cs
125                 public override string ToString()
126                 {
127                         return("SortKey - "+lcid+", "+options+", "+source);
128                 }
129         }
130 }