mcs/class/corlib/System.Globalization/CultureInfo.cs

   1 //
   2 // System.Globalization.CultureInfo.cs
   3 //
   4 // Authors:
   5 // Miguel de Icaza (miguel@ximian.com)
   6 // Dick Porter (dick@ximian.com)
   7 // Marek Safar (marek.safar@gmail.com)
   8 //
   9 // (C) 2001, 2002, 2003 Ximian, Inc. (http://www.ximian.com)
  10 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  11 // Copyright (C) 2012 Xamarin Inc (http://www.xamarin.com)
  12 //
  13 // Permission is hereby granted, free of charge, to any person obtaining
  14 // a copy of this software and associated documentation files (the
  15 // "Software"), to deal in the Software without restriction, including
  16 // without limitation the rights to use, copy, modify, merge, publish,
  17 // distribute, sublicense, and/or sell copies of the Software, and to
  18 // permit persons to whom the Software is furnished to do so, subject to
  19 // the following conditions:
  20 //
  21 // The above copyright notice and this permission notice shall be
  22 // included in all copies or substantial portions of the Software.
  23 //
  24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  31 //
  32
  33 using System.Collections.Generic;
  34 using System.Threading;
  35 using System.Runtime.CompilerServices;
  36 using System.Runtime.InteropServices;
  37
  38 namespace System.Globalization
  39 {
  40         [System.Runtime.InteropServices.ComVisible (true)]
  41         [Serializable]
  42         [StructLayout (LayoutKind.Sequential)]
  43         public class CultureInfo : ICloneable, IFormatProvider
  44         {
  45                 static volatile CultureInfo invariant_culture_info = new CultureInfo (InvariantCultureId, false, true);
  46                 static object shared_table_lock = new object ();
  47                 static CultureInfo default_current_culture;
  48
  49 #pragma warning disable 169, 649
  50                 bool m_isReadOnly;
  51                 int  cultureID;
  52                 [NonSerialized]
  53                 int parent_lcid;
  54                 [NonSerialized]
  55                 int datetime_index;
  56                 [NonSerialized]
  57                 int number_index;
  58                 [NonSerialized]
  59                 int default_calendar_type;
  60                 bool m_useUserOverride;
  61                 [NonSerialized]
  62                 volatile NumberFormatInfo numInfo;
  63                 volatile DateTimeFormatInfo dateTimeInfo;
  64                 volatile TextInfo textInfo;
  65                 private string m_name;
  66
  67                 [NonSerialized]
  68                 private string englishname;
  69                 [NonSerialized]
  70                 private string nativename;
  71                 [NonSerialized]
  72                 private string iso3lang;
  73                 [NonSerialized]
  74                 private string iso2lang;
  75                 [NonSerialized]
  76                 private string win3lang;
  77                 [NonSerialized]
  78                 private string territory;
  79                 [NonSerialized]
  80                 string[] native_calendar_names;
  81
  82                 volatile CompareInfo compareInfo;
  83                 [NonSerialized]
  84                 private unsafe readonly void *textinfo_data;
  85
  86                 int m_dataItem;         // MS.NET serializes this.
  87 #pragma warning restore 169, 649
  88
  89                 Calendar calendar;
  90
  91                 [NonSerialized]
  92                 CultureInfo parent_culture;
  93
  94                 // Deserialized instances will set this to false
  95                 [NonSerialized]
  96                 bool constructed;
  97
  98                 [NonSerialized]
  99                 // Used by Thread.set_CurrentCulture
 100                 internal byte[] cached_serialized_form;
 101
 102                 internal const int InvariantCultureId = 0x7F;
 103                 const int CalendarTypeBits = 8;
 104
 105                 const string MSG_READONLY = "This instance is read only";
 106
 107                 public static CultureInfo InvariantCulture {
 108                         get {
 109                                 return invariant_culture_info;
 110                         }
 111                 }
 112
 113                 public static CultureInfo CurrentCulture {
 114                         get {
 115                                 return Thread.CurrentThread.CurrentCulture;
 116                         }
 117                 }
 118
 119                 public static CultureInfo CurrentUICulture {
 120                         get {
 121                                 return Thread.CurrentThread.CurrentUICulture;
 122                         }
 123                 }
 124
 125                 internal static CultureInfo ConstructCurrentCulture ()
 126                 {
 127                         if (default_current_culture != null)
 128                                 return default_current_culture;
 129
 130                         var locale_name = get_current_locale_name ();
 131                         CultureInfo ci = null;
 132                         try {
 133                                 ci = CreateSpecificCulture (locale_name);
 134                         } catch {
 135                         }
 136
 137                         if (ci == null) {
 138                                 ci = InvariantCulture;
 139                         } else {
 140                                 ci.m_isReadOnly = true;
 141                                 ci.m_useUserOverride = true;
 142                         }
 143
 144                         default_current_culture = ci;
 145                         return ci;
 146                 }
 147
 148                 internal static CultureInfo ConstructCurrentUICulture ()
 149                 {
 150                         return ConstructCurrentCulture ();
 151                 }
 152
 153                 // it is used for RegionInfo.
 154                 internal string Territory {
 155                         get { return territory; }
 156                 }
 157
 158 #if !NET_2_1
 159                 // FIXME: It is implemented, but would be hell slow.
 160                 [ComVisible (false)]
 161                 public CultureTypes CultureTypes {
 162                         get {
 163                                 CultureTypes ret = (CultureTypes) 0;
 164                                 foreach (CultureTypes v in Enum.GetValues (typeof (CultureTypes)))
 165                                         if (Array.IndexOf (GetCultures (v), this) >= 0)
 166                                                 ret |= v;
 167                                 return ret;
 168                         }
 169                 }
 170
 171                 [ComVisible (false)]
 172                 public CultureInfo GetConsoleFallbackUICulture ()
 173                 {
 174                         // as documented in MSDN ...
 175                         switch (Name) {
 176                         case "ar": case "ar-BH": case "ar-EG": case "ar-IQ":
 177                         case "ar-JO": case "ar-KW": case "ar-LB": case "ar-LY":
 178                         case "ar-QA": case "ar-SA": case "ar-SY": case "ar-AE":
 179                         case "ar-YE":
 180                         case "dv": case "dv-MV":
 181                         case "fa": case "fa-IR":
 182                         case "gu": case "gu-IN":
 183                         case "he": case "he-IL":
 184                         case "hi": case "hi-IN":
 185                         case "kn": case "kn-IN":
 186                         case "kok": case "kok-IN":
 187                         case "mr": case "mr-IN":
 188                         case "pa": case "pa-IN":
 189                         case "sa": case "sa-IN":
 190                         case "syr": case "syr-SY":
 191                         case "ta": case "ta-IN":
 192                         case "te": case "te-IN":
 193                         case "th": case "th-TH":
 194                         case "ur": case "ur-PK":
 195                         case "vi": case "vi-VN":
 196                                 return GetCultureInfo ("en");
 197                         case "ar-DZ": case "ar-MA": case "ar-TN":
 198                                 return GetCultureInfo ("fr");
 199                         }
 200                         return (CultureTypes & CultureTypes.WindowsOnlyCultures) != 0 ? CultureInfo.InvariantCulture : this;
 201                 }
 202
 203                 [ComVisible (false)]
 204                 public string IetfLanguageTag {
 205                         // There could be more consistent way to implement
 206                         // it, but right now it works just fine with this...
 207                         get {
 208                                 switch (Name) {
 209                                 case "zh-CHS":
 210                                         return "zh-Hans";
 211                                 case "zh-CHT":
 212                                         return "zh-Hant";
 213                                 default:
 214                                         return Name;
 215                                 }
 216                         }
 217                 }
 218
 219                 // For specific cultures it basically returns LCID.
 220                 // For neutral cultures it is mapped to the default(?) specific
 221                 // culture, where the LCID of the specific culture seems to be
 222                 // n + 1024 by default. zh-CHS is the only exception which is
 223                 // mapped to 2052, not 1028 (zh-CHT is mapped to 1028 instead).
 224                 // There are very few exceptions, here I simply list them here.
 225                 // It is Windows-specific property anyways, so no worthy of
 226                 // trying to do some complex things with locale-builder.
 227                 [ComVisible (false)]
 228                 public virtual int KeyboardLayoutId {
 229                         get {
 230                                 switch (LCID) {
 231                                 case 4: // zh-CHS (neutral)
 232                                         return 2052;
 233                                 case 1034: // es-ES Spanish 2
 234                                         return 3082;
 235                                 case 31748: // zh-CHT (neutral)
 236                                         return 1028;
 237                                 case 31770: // sr (neutral)
 238                                         return 2074;
 239                                 default:
 240                                         return LCID < 1024 ? LCID + 1024 : LCID;
 241                                 }
 242                         }
 243                 }
 244 #endif
 245
 246                 public virtual int LCID {
 247                         get {
 248                                 return cultureID;
 249                         }
 250                 }
 251
 252                 public virtual string Name {
 253                         get {
 254                                 return(m_name);
 255                         }
 256                 }
 257
 258                 public virtual string NativeName {
 259                         get {
 260                                 if (!constructed) Construct ();
 261                                 return nativename;
 262                         }
 263                 }
 264
 265                 internal string NativeCalendarName {
 266                         get {
 267                                 if (!constructed) Construct ();
 268                                 return native_calendar_names[(default_calendar_type >> CalendarTypeBits) - 1];
 269                         }
 270                 }
 271
 272                 public virtual Calendar Calendar {
 273                         get {
 274                                 if (calendar == null) {
 275                                         if (!constructed) Construct ();
 276                                         calendar = CreateCalendar (default_calendar_type);
 277                                 }
 278
 279                                 return calendar;
 280                         }
 281                 }
 282
 283                 [MonoLimitation ("Optional calendars are not supported only default calendar is returned")]
 284                 public virtual Calendar[] OptionalCalendars {
 285                         get {
 286                                 return new[] { Calendar };
 287                         }
 288                 }
 289
 290                 public virtual CultureInfo Parent
 291                 {
 292                         get {
 293                                 if (parent_culture == null) {
 294                                         if (!constructed)
 295                                                 Construct ();
 296                                         if (parent_lcid == cultureID) {
 297                                                 //
 298                                                 // Parent lcid is same but culture info is not for legacy zh culture
 299                                                 //
 300                                                 if (parent_lcid == 0x7C04 && EnglishName [EnglishName.Length - 1] == 'y')
 301                                                         return parent_culture = new CultureInfo ("zh-Hant");
 302                                                 else if (parent_lcid == 0x0004 && EnglishName [EnglishName.Length -1] == 'y')
 303                                                         return parent_culture = new CultureInfo ("zh-Hans");
 304                                                 return null;
 305                                         }
 306
 307                                         if (parent_lcid == InvariantCultureId)
 308                                                 parent_culture = InvariantCulture;
 309                                         else if (cultureID == InvariantCultureId)
 310                                                 parent_culture = this;
 311                                         else if (cultureID == 0x0404) {
 312                                                 // zh-tw has parent id 0x7C04 which is in this case zh-cht and not zh-hant
 313                                                 parent_culture = new CultureInfo ("zh-CHT");
 314                                         } else
 315                                                 parent_culture = new CultureInfo (parent_lcid);
 316                                 }
 317                                 return parent_culture;
 318                         }
 319                 }
 320
 321                 public virtual TextInfo TextInfo
 322                 {
 323                         get {
 324                                 if (textInfo == null) {
 325                                         if (!constructed) Construct ();
 326                                         lock (this) {
 327                                                 if(textInfo == null) {
 328                                                         textInfo = CreateTextInfo (m_isReadOnly);
 329                                                 }
 330                                         }
 331                                 }
 332
 333                                 return(textInfo);
 334                         }
 335                 }
 336
 337                 public virtual string ThreeLetterISOLanguageName {
 338                         get {
 339                                 if (!constructed) Construct ();
 340                                 return iso3lang;
 341                         }
 342                 }
 343
 344                 public virtual string ThreeLetterWindowsLanguageName
 345                 {
 346                         get {
 347                                 if (!constructed) Construct ();
 348                                 return(win3lang);
 349                         }
 350                 }
 351
 352                 public virtual string TwoLetterISOLanguageName {
 353                         get {
 354                                 if (!constructed) Construct ();
 355                                 return(iso2lang);
 356                         }
 357                 }
 358
 359                 public bool UseUserOverride
 360                 {
 361                         get {
 362                                 return m_useUserOverride;
 363                         }
 364                 }
 365
 366                 public void ClearCachedData()
 367                 {
 368                         lock (shared_table_lock) {
 369                                 shared_by_number = null;
 370                                 shared_by_name = null;
 371                         }
 372
 373                         //
 374                         // ClearCachedData method does not refresh the information in
 375                         // the Thread.CurrentCulture property for existing threads
 376                         //
 377                         default_current_culture = null;
 378
 379                         RegionInfo.ClearCachedData ();
 380                         TimeZone.ClearCachedData ();
 381                         DateTime.ClearCachedData ();
 382                         TimeZoneInfo.ClearCachedData ();
 383                 }
 384
 385                 public virtual object Clone()
 386                 {
 387                         if (!constructed) Construct ();
 388                         CultureInfo ci=(CultureInfo)MemberwiseClone ();
 389                         ci.m_isReadOnly=false;
 390                         ci.cached_serialized_form=null;
 391                         if (!IsNeutralCulture) {
 392                                 ci.NumberFormat = (NumberFormatInfo)NumberFormat.Clone ();
 393                                 ci.DateTimeFormat = (DateTimeFormatInfo)DateTimeFormat.Clone ();
 394                         }
 395                         return(ci);
 396                 }
 397
 398                 public override bool Equals (object value)
 399                 {
 400                         CultureInfo b = value as CultureInfo;
 401
 402                         if (b != null)
 403                                 return b.cultureID == cultureID;
 404                         return false;
 405                 }
 406
 407                 public static CultureInfo[] GetCultures(CultureTypes types)
 408                 {
 409                         bool neutral=((types & CultureTypes.NeutralCultures)!=0);
 410                         bool specific=((types & CultureTypes.SpecificCultures)!=0);
 411                         bool installed=((types & CultureTypes.InstalledWin32Cultures)!=0);  // TODO
 412
 413                         CultureInfo [] infos = internal_get_cultures (neutral, specific, installed);
 414                         // The runtime returns a NULL in the first position of the array when
 415                         // 'neutral' is true. We fill it in with a clone of InvariantCulture
 416                         // since it must not be read-only
 417                         if (neutral && infos.Length > 0 && infos [0] == null) {
 418                                 infos [0] = (CultureInfo) InvariantCulture.Clone ();
 419                         }
 420
 421                         return infos;
 422                 }
 423
 424                 public override int GetHashCode ()
 425                 {
 426                         return cultureID.GetHashCode ();
 427                 }
 428
 429                 public static CultureInfo ReadOnly(CultureInfo ci)
 430                 {
 431                         if(ci==null) {
 432                                 throw new ArgumentNullException("ci");
 433                         }
 434
 435                         if(ci.m_isReadOnly) {
 436                                 return(ci);
 437                         } else {
 438                                 CultureInfo new_ci=(CultureInfo)ci.Clone ();
 439                                 new_ci.m_isReadOnly=true;
 440                                 if (new_ci.numInfo != null)
 441                                         new_ci.numInfo = NumberFormatInfo.ReadOnly (new_ci.numInfo);
 442                                 if (new_ci.dateTimeInfo != null)
 443                                         new_ci.dateTimeInfo = DateTimeFormatInfo.ReadOnly (new_ci.dateTimeInfo);
 444                                 if (new_ci.textInfo != null)
 445                                         new_ci.textInfo = TextInfo.ReadOnly (new_ci.textInfo);
 446                                 return(new_ci);
 447                         }
 448                 }
 449
 450                 public override string ToString()
 451                 {
 452                         return(m_name);
 453                 }
 454
 455                 public virtual CompareInfo CompareInfo
 456                 {
 457                         get {
 458                                 if(compareInfo==null) {
 459                                         if (!constructed)
 460                                                 Construct ();
 461
 462                                         lock (this) {
 463                                                 if(compareInfo==null) {
 464                                                         compareInfo=new CompareInfo (this);
 465                                                 }
 466                                         }
 467                                 }
 468
 469                                 return(compareInfo);
 470                         }
 471                 }
 472
 473                 public virtual bool IsNeutralCulture {
 474                         get {
 475                                 if (cultureID == InvariantCultureId)
 476                                         return false;
 477
 478                                 if (!constructed) Construct ();
 479                                 return territory == null;
 480                         }
 481                 }
 482
 483                 internal void CheckNeutral ()
 484                 {
 485                 }
 486
 487                 public virtual NumberFormatInfo NumberFormat {
 488                         get {
 489                                 if (!constructed) Construct ();
 490                                 CheckNeutral ();
 491                                 if (numInfo == null){
 492                                         lock (this){
 493                                                 if (numInfo == null) {
 494                                                         numInfo = new NumberFormatInfo (m_isReadOnly);
 495                                                         construct_number_format ();
 496                                                 }
 497                                         }
 498                                 }
 499
 500                                 return numInfo;
 501                         }
 502
 503                         set {
 504                                 if (!constructed) Construct ();
 505                                 if (m_isReadOnly) throw new InvalidOperationException(MSG_READONLY);
 506
 507                                 if (value == null)
 508                                         throw new ArgumentNullException ("NumberFormat");
 509
 510                                 numInfo = value;
 511                         }
 512                 }
 513
 514                 public virtual DateTimeFormatInfo DateTimeFormat {
 515                         get {
 516                                 if (dateTimeInfo != null)
 517                                         return dateTimeInfo;
 518
 519                                 if (!constructed) Construct ();
 520                                 CheckNeutral ();
 521
 522                                 // TODO: Have to lock because construct_datetime_format is not atomic
 523                                 lock (this) {
 524                                         if (cultureID == InvariantCultureId && m_isReadOnly)
 525                                                 dateTimeInfo = DateTimeFormatInfo.InvariantInfo;
 526                                         else if (dateTimeInfo == null) {
 527                                                 dateTimeInfo = new DateTimeFormatInfo (this, m_isReadOnly);
 528                                                 if (cultureID != InvariantCultureId)
 529                                                         construct_datetime_format ();
 530                                         }
 531                                 }
 532
 533                                 return dateTimeInfo;
 534                         }
 535
 536                         set {
 537                                 if (!constructed) Construct ();
 538                                 if (m_isReadOnly) throw new InvalidOperationException(MSG_READONLY);
 539
 540                                 if (value == null)
 541                                         throw new ArgumentNullException ("DateTimeFormat");
 542
 543                                 dateTimeInfo = value;
 544                         }
 545                 }
 546
 547                 public virtual string DisplayName {
 548                         get {
 549                                 // Mono is not localized and will always return english name regardless of OS locale
 550                                 return EnglishName;
 551                         }
 552                 }
 553
 554                 public virtual string EnglishName {
 555                         get {
 556                                 if (!constructed) Construct ();
 557                                 return englishname;
 558                         }
 559                 }
 560
 561                 public static CultureInfo InstalledUICulture {
 562                         get {
 563                                 return ConstructCurrentCulture ();
 564                         }
 565                 }
 566
 567                 public bool IsReadOnly {
 568                         get {
 569                                 return m_isReadOnly;
 570                         }
 571                 }
 572
 573
 574                 //
 575                 // IFormatProvider implementation
 576                 //
 577                 public virtual object GetFormat( Type formatType )
 578                 {
 579                         object format = null;
 580
 581                         if ( formatType == typeof(NumberFormatInfo) )
 582                                 format = NumberFormat;
 583                         else if ( formatType == typeof(DateTimeFormatInfo) )
 584                                 format = DateTimeFormat;
 585
 586                         return format;
 587                 }
 588
 589                 void Construct ()
 590                 {
 591                         construct_internal_locale_from_lcid (cultureID);
 592                         constructed = true;
 593                 }
 594
 595                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 596                 private extern bool construct_internal_locale_from_lcid (int lcid);
 597
 598                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 599                 private extern bool construct_internal_locale_from_name (string name);
 600
 601                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 602                 private extern static string get_current_locale_name ();
 603
 604                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 605                 private extern static CultureInfo [] internal_get_cultures (bool neutral, bool specific, bool installed);
 606
 607                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 608                 private extern void construct_datetime_format ();
 609
 610                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 611                 private extern void construct_number_format ();
 612
 613                 private void ConstructInvariant (bool read_only)
 614                 {
 615                         cultureID = InvariantCultureId;
 616
 617                         /* NumberFormatInfo defaults to the invariant data */
 618                         numInfo=NumberFormatInfo.InvariantInfo;
 619
 620                         if (!read_only) {
 621                                 numInfo = (NumberFormatInfo) numInfo.Clone ();
 622                         }
 623
 624                         textInfo = CreateTextInfo (read_only);
 625
 626                         m_name=String.Empty;
 627                         englishname=
 628                         nativename="Invariant Language (Invariant Country)";
 629                         iso3lang="IVL";
 630                         iso2lang="iv";
 631                         win3lang="IVL";
 632                         default_calendar_type = 1 << CalendarTypeBits | (int) GregorianCalendarTypes.Localized;
 633                 }
 634
 635                 private unsafe TextInfo CreateTextInfo (bool readOnly)
 636                 {
 637                         return new TextInfo (this, cultureID, this.textinfo_data, readOnly);
 638                 }
 639
 640                 public CultureInfo (int culture) : this (culture, true) {}
 641
 642                 public CultureInfo (int culture, bool useUserOverride) :
 643                         this (culture, useUserOverride, false) {}
 644
 645                 private CultureInfo (int culture, bool useUserOverride, bool read_only)
 646                 {
 647                         if (culture < 0)
 648                                 throw new ArgumentOutOfRangeException ("culture", "Positive "
 649                                         + "number required.");
 650
 651                         constructed = true;
 652                         m_isReadOnly = read_only;
 653                         m_useUserOverride = useUserOverride;
 654
 655                         if (culture == InvariantCultureId) {
 656                                 /* Short circuit the invariant culture */
 657                                 ConstructInvariant (read_only);
 658                                 return;
 659                         }
 660
 661                         if (!construct_internal_locale_from_lcid (culture)) {
 662                                 //
 663                                 // Be careful not to cause recursive CultureInfo initialization
 664                                 //
 665                                 var msg = string.Format (InvariantCulture, "Culture ID {0} (0x{1}) is not a supported culture.", culture.ToString (InvariantCulture), culture.ToString ("X4", InvariantCulture));
 666                                 throw new CultureNotFoundException ("culture", msg);
 667                         }
 668                 }
 669
 670                 public CultureInfo (string name) : this (name, true) {}
 671
 672                 public CultureInfo (string name, bool useUserOverride) :
 673                         this (name, useUserOverride, false) {}
 674
 675                 private CultureInfo (string name, bool useUserOverride, bool read_only)
 676                 {
 677                         if (name == null)
 678                                 throw new ArgumentNullException ("name");
 679
 680                         constructed = true;
 681                         m_isReadOnly = read_only;
 682                         m_useUserOverride = useUserOverride;
 683
 684                         if (name.Length == 0) {
 685                                 /* Short circuit the invariant culture */
 686                                 ConstructInvariant (read_only);
 687                                 return;
 688                         }
 689
 690                         if (!construct_internal_locale_from_name (name.ToLowerInvariant ())) {
 691                                 throw CreateNotFoundException (name);
 692                         }
 693                 }
 694
 695                 // This is used when creating by specific name and creating by
 696                 // current locale so we can initialize the object without
 697                 // doing any member initialization
 698                 private CultureInfo () { constructed = true; }
 699                 static Dictionary<int, CultureInfo> shared_by_number;
 700                 static Dictionary<string, CultureInfo> shared_by_name;
 701
 702                 static void insert_into_shared_tables (CultureInfo c)
 703                 {
 704                         if (shared_by_number == null){
 705                                 shared_by_number = new Dictionary<int, CultureInfo> ();
 706                                 shared_by_name = new Dictionary<string, CultureInfo> ();
 707                         }
 708                         shared_by_number [c.cultureID] = c;
 709                         shared_by_name [c.m_name] = c;
 710                 }
 711
 712                 public static CultureInfo GetCultureInfo (int culture)
 713                 {
 714                         CultureInfo c;
 715
 716                         lock (shared_table_lock){
 717                                 if (shared_by_number != null) {
 718                                         if (shared_by_number.TryGetValue (culture, out c))
 719                                                 return c;
 720                                 }
 721
 722                                 c = new CultureInfo (culture, false, true);
 723                                 insert_into_shared_tables (c);
 724                                 return c;
 725                         }
 726                 }
 727
 728                 public static CultureInfo GetCultureInfo (string name)
 729                 {
 730                         if (name == null)
 731                                 throw new ArgumentNullException ("name");
 732
 733                         CultureInfo c;
 734                         lock (shared_table_lock){
 735                                 if (shared_by_name != null){
 736                                         if (shared_by_name.TryGetValue (name, out c))
 737                                                 return c;
 738                                 }
 739                                 c = new CultureInfo (name, false, true);
 740                                 insert_into_shared_tables (c);
 741                                 return c;
 742                         }
 743                 }
 744
 745                 [MonoTODO ("Currently it ignores the altName parameter")]
 746                 public static CultureInfo GetCultureInfo (string name, string altName) {
 747                         if (name == null)
 748                                 throw new ArgumentNullException ("null");
 749                         if (altName == null)
 750                                 throw new ArgumentNullException ("null");
 751
 752                         return GetCultureInfo (name);
 753                 }
 754
 755                 public static CultureInfo GetCultureInfoByIetfLanguageTag (string name)
 756                 {
 757                         // There could be more consistent way to implement
 758                         // it, but right now it works just fine with this...
 759                         switch (name) {
 760                         case "zh-Hans":
 761                                 return GetCultureInfo ("zh-CHS");
 762                         case "zh-Hant":
 763                                 return GetCultureInfo ("zh-CHT");
 764                         default:
 765                                 return GetCultureInfo (name);
 766                         }
 767                 }
 768
 769                 // used in runtime (icall.c) to construct CultureInfo for
 770                 // AssemblyName of assemblies
 771                 internal static CultureInfo CreateCulture (string name, bool reference)
 772                 {
 773                         bool read_only;
 774                         bool use_user_override;
 775
 776                         bool invariant = name.Length == 0;
 777                         if (reference) {
 778                                 use_user_override = invariant ? false : true;
 779                                 read_only = false;
 780                         } else {
 781                                 read_only = false;
 782                                 use_user_override = invariant ? false : true;
 783                         }
 784
 785                         return new CultureInfo (name, use_user_override, read_only);
 786                 }
 787
 788                 public static CultureInfo CreateSpecificCulture (string name)
 789                 {
 790                         if (name == null)
 791                                 throw new ArgumentNullException ("name");
 792
 793                         if (name.Length == 0)
 794                                 return InvariantCulture;
 795
 796                         var src_name = name;
 797                         name = name.ToLowerInvariant ();
 798                         CultureInfo ci = new CultureInfo ();
 799
 800                         if (!ci.construct_internal_locale_from_name (name)) {
 801                                 int idx = name.IndexOf ('-');
 802                                 if (idx < 1 || !ci.construct_internal_locale_from_name (name.Substring (0, idx)))
 803                                         throw CreateNotFoundException (src_name);
 804                         }
 805
 806                         if (ci.IsNeutralCulture)
 807                                 ci = CreateSpecificCultureFromNeutral (ci.Name);
 808
 809                         return ci;
 810                 }
 811
 812                 //
 813                 // Creates specific culture from neutral culture. Used by CreateSpecificCulture
 814                 // only but using separate method we can delay switch underlying Dictionary
 815                 // initialization
 816                 //
 817                 static CultureInfo CreateSpecificCultureFromNeutral (string name)
 818                 {
 819                         int id;
 820
 821                         //
 822                         // For neutral cultures find predefined default specific culture
 823                         //
 824                         // Use managed switch because we need this for only some cultures
 825                         // and the method is not used frequently
 826                         //
 827                         // TODO: We could optimize for cultures with single specific culture
 828                         //
 829                         switch (name.ToLowerInvariant ()) {
 830                         case "af": id = 1078; break;
 831                         case "am": id = 1118; break;
 832                         case "ar": id = 1025; break;
 833                         case "arn": id = 1146; break;
 834                         case "as": id = 1101; break;
 835                         case "az": id = 1068; break;
 836                         case "az-cyrl": id = 2092; break;
 837                         case "az-latn": id = 1068; break;
 838                         case "ba": id = 1133; break;
 839                         case "be": id = 1059; break;
 840                         case "bg": id = 1026; break;
 841                         case "bn": id = 1093; break;
 842                         case "bo": id = 1105; break;
 843                         case "br": id = 1150; break;
 844                         case "bs": id = 5146; break;
 845                         case "bs-cyrl": id = 8218; break;
 846                         case "bs-latn": id = 5146; break;
 847                         case "ca": id = 1027; break;
 848                         case "co": id = 1155; break;
 849                         case "cs": id = 1029; break;
 850                         case "cy": id = 1106; break;
 851                         case "da": id = 1030; break;
 852                         case "de": id = 1031; break;
 853                         case "dsb": id = 2094; break;
 854                         case "dv": id = 1125; break;
 855                         case "el": id = 1032; break;
 856                         case "en": id = 1033; break;
 857                         case "es": id = 3082; break;
 858                         case "et": id = 1061; break;
 859                         case "eu": id = 1069; break;
 860                         case "fa": id = 1065; break;
 861                         case "fi": id = 1035; break;
 862                         case "fil": id = 1124; break;
 863                         case "fo": id = 1080; break;
 864                         case "fr": id = 1036; break;
 865                         case "fy": id = 1122; break;
 866                         case "ga": id = 2108; break;
 867                         case "gd": id = 1169; break;
 868                         case "gl": id = 1110; break;
 869                         case "gsw": id = 1156; break;
 870                         case "gu": id = 1095; break;
 871                         case "ha": id = 1128; break;
 872                         case "ha-latn": id = 1128; break;
 873                         case "he": id = 1037; break;
 874                         case "hi": id = 1081; break;
 875                         case "hr": id = 1050; break;
 876                         case "hsb": id = 1070; break;
 877                         case "hu": id = 1038; break;
 878                         case "hy": id = 1067; break;
 879                         case "id": id = 1057; break;
 880                         case "ig": id = 1136; break;
 881                         case "ii": id = 1144; break;
 882                         case "is": id = 1039; break;
 883                         case "it": id = 1040; break;
 884                         case "iu": id = 2141; break;
 885                         case "iu-cans": id = 1117; break;
 886                         case "iu-latn": id = 2141; break;
 887                         case "ja": id = 1041; break;
 888                         case "ka": id = 1079; break;
 889                         case "kk": id = 1087; break;
 890                         case "kl": id = 1135; break;
 891                         case "km": id = 1107; break;
 892                         case "kn": id = 1099; break;
 893                         case "ko": id = 1042; break;
 894                         case "kok": id = 1111; break;
 895                         case "ky": id = 1088; break;
 896                         case "lb": id = 1134; break;
 897                         case "lo": id = 1108; break;
 898                         case "lt": id = 1063; break;
 899                         case "lv": id = 1062; break;
 900                         case "mi": id = 1153; break;
 901                         case "mk": id = 1071; break;
 902                         case "ml": id = 1100; break;
 903                         case "mn": id = 1104; break;
 904                         case "mn-cyrl": id = 1104; break;
 905                         case "mn-mong": id = 2128; break;
 906                         case "moh": id = 1148; break;
 907                         case "mr": id = 1102; break;
 908                         case "ms": id = 1086; break;
 909                         case "mt": id = 1082; break;
 910                         case "nb": id = 1044; break;
 911                         case "ne": id = 1121; break;
 912                         case "nl": id = 1043; break;
 913                         case "nn": id = 2068; break;
 914                         case "no": id = 1044; break;
 915                         case "nso": id = 1132; break;
 916                         case "oc": id = 1154; break;
 917                         case "or": id = 1096; break;
 918                         case "pa": id = 1094; break;
 919                         case "pl": id = 1045; break;
 920                         case "prs": id = 1164; break;
 921                         case "ps": id = 1123; break;
 922                         case "pt": id = 1046; break;
 923                         case "qut": id = 1158; break;
 924                         case "quz": id = 1131; break;
 925                         case "rm": id = 1047; break;
 926                         case "ro": id = 1048; break;
 927                         case "ru": id = 1049; break;
 928                         case "rw": id = 1159; break;
 929                         case "sa": id = 1103; break;
 930                         case "sah": id = 1157; break;
 931                         case "se": id = 1083; break;
 932                         case "si": id = 1115; break;
 933                         case "sk": id = 1051; break;
 934                         case "sl": id = 1060; break;
 935                         case "sma": id = 7227; break;
 936                         case "smj": id = 5179; break;
 937                         case "smn": id = 9275; break;
 938                         case "sms": id = 8251; break;
 939                         case "sq": id = 1052; break;
 940                         case "sr": id = 9242; break;
 941                         case "sr-cyrl": id = 10266; break;
 942                         case "sr-latn": id = 9242; break;
 943                         case "sv": id = 1053; break;
 944                         case "sw": id = 1089; break;
 945                         case "syr": id = 1114; break;
 946                         case "ta": id = 1097; break;
 947                         case "te": id = 1098; break;
 948                         case "tg": id = 1064; break;
 949                         case "tg-cyrl": id = 1064; break;
 950                         case "th": id = 1054; break;
 951                         case "tk": id = 1090; break;
 952                         case "tn": id = 1074; break;
 953                         case "tr": id = 1055; break;
 954                         case "tt": id = 1092; break;
 955                         case "tzm": id = 2143; break;
 956                         case "tzm-latn": id = 2143; break;
 957                         case "ug": id = 1152; break;
 958                         case "uk": id = 1058; break;
 959                         case "ur": id = 1056; break;
 960                         case "uz": id = 1091; break;
 961                         case "uz-cyrl": id = 2115; break;
 962                         case "uz-latn": id = 1091; break;
 963                         case "vi": id = 1066; break;
 964                         case "wo": id = 1160; break;
 965                         case "xh": id = 1076; break;
 966                         case "yo": id = 1130; break;
 967                         case "zh": id = 2052; break;
 968                         case "zh-chs":
 969                         case "zh-hans":
 970                                 id = 2052; break;
 971                         case "zh-cht":
 972                         case "zh-hant":
 973                                 id = 3076; break;
 974                         case "zu": id = 1077; break;
 975                         default:
 976                                 throw new NotImplementedException ("Mapping for neutral culture " + name);
 977                         }
 978
 979                         return new CultureInfo (id);
 980                 }
 981
 982                 static Calendar CreateCalendar (int calendarType)
 983                 {
 984                         string name = null;
 985                         switch (calendarType >> CalendarTypeBits) {
 986                         case 1:
 987                                 GregorianCalendarTypes greg_type;
 988                                 greg_type = (GregorianCalendarTypes) (calendarType & 0xFF);
 989                                 return new GregorianCalendar (greg_type);
 990                         case 2:
 991                                 name = "System.Globalization.ThaiBuddhistCalendar";
 992                                 break;
 993                         case 3:
 994                                 name = "System.Globalization.UmAlQuraCalendar";
 995                                 break;
 996                         case 4:
 997                                 name = "System.Globalization.HijriCalendar";
 998                                 break;
 999                         default:
1000                                 throw new NotImplementedException ("Unknown calendar type: " + calendarType);
1001                         }
1002
1003                         Type type = Type.GetType (name, false);
1004                         if (type == null)
1005                                 return new GregorianCalendar (GregorianCalendarTypes.Localized); // return invariant calendar if not found
1006                         return (Calendar) Activator.CreateInstance (type);
1007                 }
1008
1009                 static Exception CreateNotFoundException (string name)
1010                 {
1011                         return new CultureNotFoundException ("name", "Culture name " + name + " is not supported.");
1012                 }
1013
1014                 public static CultureInfo DefaultThreadCurrentCulture {
1015                         get {
1016                                 return Thread.default_culture;
1017                         }
1018                         set {
1019                                 Thread.default_culture = value;
1020                         }
1021                 }
1022
1023                 public static CultureInfo DefaultThreadCurrentUICulture {
1024                         get {
1025                                 return Thread.default_ui_culture;
1026                         }
1027                         set {
1028                                 Thread.default_ui_culture = value;
1029                         }
1030                 }
1031         }
1032 }