mcs/class/corlib/ReferenceSources/CompareInfo.cs

   1 //
   2 // CompareInfo.cs
   3 //
   4 // Authors:
   5 //      Marek Safar  <marek.safar@gmail.com>
   6 //
   7 // Copyright (C) 2015 Xamarin Inc (http://www.xamarin.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 using System.Collections.Generic;
  30 using System.Runtime.CompilerServices;
  31 using Mono.Globalization.Unicode;
  32 using System.Threading;
  33
  34 namespace System.Globalization
  35 {
  36         partial class CompareInfo
  37         {
  38                 [NonSerialized]
  39                 SimpleCollator collator;
  40
  41                 // Maps culture IDs to SimpleCollator objects
  42                 static Dictionary<string, SimpleCollator> collators;
  43                 static bool managedCollation;
  44                 static bool managedCollationChecked;
  45
  46                 static bool UseManagedCollation {
  47                         get {
  48                                 if (!managedCollationChecked) {
  49                                         managedCollation = Environment.internalGetEnvironmentVariable ("MONO_DISABLE_MANAGED_COLLATION") != "yes" && MSCompatUnicodeTable.IsReady;
  50                                         managedCollationChecked = true;
  51                                 }
  52
  53                                 return managedCollation;
  54                         }
  55                 }
  56
  57                 SimpleCollator GetCollator ()
  58                 {
  59                         if (collator != null)
  60                                 return collator;
  61
  62                         if (collators == null) {
  63                                 Interlocked.CompareExchange (ref collators, new Dictionary<string, SimpleCollator> (StringComparer.Ordinal), null);
  64                         }
  65
  66                         lock (collators) {
  67                                 if (!collators.TryGetValue (m_sortName, out collator)) {
  68                                         collator = new SimpleCollator (CultureInfo.GetCultureInfo (m_name));
  69                                         collators [m_sortName] = collator;
  70                                 }
  71                         }
  72
  73                         return collator;
  74                 }
  75
  76                 SortKey CreateSortKeyCore (string source, CompareOptions options)
  77                 {
  78                         if (UseManagedCollation)
  79                                 return GetCollator ().GetSortKey (source, options);
  80                         SortKey key=new SortKey (culture, source, options);
  81
  82                         /* Need to do the icall here instead of in the
  83                          * SortKey constructor, as we need access to
  84                          * this instance's collator.
  85                          */
  86                         assign_sortkey (key, source, options);
  87
  88                         return(key);
  89                 }
  90
  91                 int internal_index_switch (string s, int sindex, int count, char c, CompareOptions opt, bool first)
  92                 {
  93                         if (opt == CompareOptions.Ordinal && first)
  94                                 return s.IndexOfUnchecked (c, sindex, count);
  95
  96                         return UseManagedCollation ?
  97                                 internal_index_managed (s, sindex, count, c, opt, first) :
  98                                 internal_index (s, sindex, count, c, opt, first);
  99                 }
 100
 101                 int internal_index_switch (string s1, int sindex, int count, string s2, CompareOptions opt, bool first)
 102                 {
 103                         if (opt == CompareOptions.Ordinal && first)
 104                                 return s1.IndexOfUnchecked (s2, sindex, count);
 105
 106                         return UseManagedCollation ?
 107                                 internal_index_managed (s1, sindex, count, s2, opt, first) :
 108                                 internal_index (s1, sindex, count, s2, opt, first);
 109                 }
 110
 111                 int internal_compare_switch (string str1, int offset1, int length1, string str2, int offset2, int length2, CompareOptions options)
 112                 {
 113                         return UseManagedCollation ?
 114                                 internal_compare_managed (str1, offset1, length1,
 115                                 str2, offset2, length2, options) :
 116                                 internal_compare (str1, offset1, length1,
 117                                 str2, offset2, length2, options);
 118                 }
 119
 120                 int internal_compare_managed (string str1, int offset1, int length1, string str2, int offset2, int length2, CompareOptions options)
 121                 {
 122                         return GetCollator ().Compare (str1, offset1, length1,
 123                                 str2, offset2, length2, options);
 124                 }
 125
 126                 int internal_index_managed (string s, int sindex, int count, char c, CompareOptions opt, bool first)
 127                 {
 128                         return first ?
 129                                 GetCollator ().IndexOf (s, c, sindex, count, opt) :
 130                                 GetCollator ().LastIndexOf (s, c, sindex, count, opt);
 131                 }
 132
 133                 int internal_index_managed (string s1, int sindex, int count, string s2, CompareOptions opt, bool first)
 134                 {
 135                         return first ?
 136                                 GetCollator ().IndexOf (s1, s2, sindex, count, opt) :
 137                                 GetCollator ().LastIndexOf (s1, s2, sindex, count, opt);
 138                 }
 139
 140                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 141                 private extern void assign_sortkey (object key, string source,
 142                                                         CompareOptions options);
 143
 144                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 145                 private extern int internal_compare (string str1, int offset1,
 146                                                          int length1, string str2,
 147                                                          int offset2, int length2,
 148                                                          CompareOptions options);
 149
 150                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 151                 private extern int internal_index (string source, int sindex,
 152                                                    int count, char value,
 153                                                    CompareOptions options,
 154                                                    bool first);
 155
 156                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 157                 private extern int internal_index (string source, int sindex,
 158                                                    int count, string value,
 159                                                    CompareOptions options,
 160                                                    bool first);
 161         }
 162 }