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 using System.Diagnostics.Contracts;
  38
  39 namespace System.Globalization
  40 {
  41         [System.Runtime.InteropServices.ComVisible (true)]
  42         [Serializable]
  43         [StructLayout (LayoutKind.Sequential)]
  44         public class CultureInfo : ICloneable, IFormatProvider
  45         {
  46                 static volatile CultureInfo invariant_culture_info = new CultureInfo (InvariantCultureId, false, true);
  47                 static object shared_table_lock = new object ();
  48                 static CultureInfo default_current_culture;
  49
  50 #pragma warning disable 169, 649
  51                 bool m_isReadOnly;
  52                 int  cultureID;
  53                 [NonSerialized]
  54                 int parent_lcid;
  55                 [NonSerialized]
  56                 int datetime_index;
  57                 [NonSerialized]
  58                 int number_index;
  59                 [NonSerialized]
  60                 int default_calendar_type;
  61                 bool m_useUserOverride;
  62                 [NonSerialized]
  63                 internal volatile NumberFormatInfo numInfo;
  64                 internal volatile DateTimeFormatInfo dateTimeInfo;
  65                 volatile TextInfo textInfo;
  66                 internal string m_name;
  67
  68                 [NonSerialized]
  69                 private string englishname;
  70                 [NonSerialized]
  71                 private string nativename;
  72                 [NonSerialized]
  73                 private string iso3lang;
  74                 [NonSerialized]
  75                 private string iso2lang;
  76                 [NonSerialized]
  77                 private string win3lang;
  78                 [NonSerialized]
  79                 private string territory;
  80                 [NonSerialized]
  81                 string[] native_calendar_names;
  82
  83                 volatile CompareInfo compareInfo;
  84                 [NonSerialized]
  85                 private unsafe readonly void *textinfo_data;
  86
  87                 int m_dataItem;         // MS.NET serializes this.
  88 #pragma warning restore 169, 649
  89
  90                 Calendar calendar;
  91
  92                 [NonSerialized]
  93                 CultureInfo parent_culture;
  94
  95                 // Deserialized instances will set this to false
  96                 [NonSerialized]
  97                 bool constructed;
  98
  99                 [NonSerialized]
 100                 // Used by Thread.set_CurrentCulture
 101                 internal byte[] cached_serialized_form;
 102
 103                 [NonSerialized]internal CultureData m_cultureData;
 104                 [NonSerialized]internal bool m_isInherited;
 105
 106                 internal const int InvariantCultureId = 0x7F;
 107                 const int CalendarTypeBits = 8;
 108
 109                 const string MSG_READONLY = "This instance is read only";
 110
 111                 public static CultureInfo InvariantCulture {
 112                         get {
 113                                 return invariant_culture_info;
 114                         }
 115                 }
 116
 117                 public static CultureInfo CurrentCulture {
 118                         get {
 119                                 return Thread.CurrentThread.CurrentCulture;
 120                         }
 121                 }
 122
 123                 public static CultureInfo CurrentUICulture {
 124                         get {
 125                                 return Thread.CurrentThread.CurrentUICulture;
 126                         }
 127                 }
 128
 129                 internal static CultureInfo ConstructCurrentCulture ()
 130                 {
 131                         if (default_current_culture != null)
 132                                 return default_current_culture;
 133
 134                         var locale_name = get_current_locale_name ();
 135                         CultureInfo ci = null;
 136                         try {
 137                                 ci = CreateSpecificCulture (locale_name);
 138                         } catch {
 139                         }
 140
 141                         if (ci == null) {
 142                                 ci = InvariantCulture;
 143                         } else {
 144                                 ci.m_isReadOnly = true;
 145                                 ci.m_useUserOverride = true;
 146                         }
 147
 148                         default_current_culture = ci;
 149                         return ci;
 150                 }
 151
 152                 internal static CultureInfo ConstructCurrentUICulture ()
 153                 {
 154                         return ConstructCurrentCulture ();
 155                 }
 156
 157                 // it is used for RegionInfo.
 158                 internal string Territory {
 159                         get { return territory; }
 160                 }
 161
 162 #if !NET_2_1
 163                 // FIXME: It is implemented, but would be hell slow.
 164                 [ComVisible (false)]
 165                 public CultureTypes CultureTypes {
 166                         get {
 167                                 CultureTypes ret = (CultureTypes) 0;
 168                                 foreach (CultureTypes v in Enum.GetValues (typeof (CultureTypes)))
 169                                         if (Array.IndexOf (GetCultures (v), this) >= 0)
 170                                                 ret |= v;
 171                                 return ret;
 172                         }
 173                 }
 174
 175                 [ComVisible (false)]
 176                 public CultureInfo GetConsoleFallbackUICulture ()
 177                 {
 178                         // as documented in MSDN ...
 179                         switch (Name) {
 180                         case "ar": case "ar-BH": case "ar-EG": case "ar-IQ":
 181                         case "ar-JO": case "ar-KW": case "ar-LB": case "ar-LY":
 182                         case "ar-QA": case "ar-SA": case "ar-SY": case "ar-AE":
 183                         case "ar-YE":
 184                         case "dv": case "dv-MV":
 185                         case "fa": case "fa-IR":
 186                         case "gu": case "gu-IN":
 187                         case "he": case "he-IL":
 188                         case "hi": case "hi-IN":
 189                         case "kn": case "kn-IN":
 190                         case "kok": case "kok-IN":
 191                         case "mr": case "mr-IN":
 192                         case "pa": case "pa-IN":
 193                         case "sa": case "sa-IN":
 194                         case "syr": case "syr-SY":
 195                         case "ta": case "ta-IN":
 196                         case "te": case "te-IN":
 197                         case "th": case "th-TH":
 198                         case "ur": case "ur-PK":
 199                         case "vi": case "vi-VN":
 200                                 return GetCultureInfo ("en");
 201                         case "ar-DZ": case "ar-MA": case "ar-TN":
 202                                 return GetCultureInfo ("fr");
 203                         }
 204                         return (CultureTypes & CultureTypes.WindowsOnlyCultures) != 0 ? CultureInfo.InvariantCulture : this;
 205                 }
 206
 207                 [ComVisible (false)]
 208                 public string IetfLanguageTag {
 209                         // There could be more consistent way to implement
 210                         // it, but right now it works just fine with this...
 211                         get {
 212                                 switch (Name) {
 213                                 case "zh-CHS":
 214                                         return "zh-Hans";
 215                                 case "zh-CHT":
 216                                         return "zh-Hant";
 217                                 default:
 218                                         return Name;
 219                                 }
 220                         }
 221                 }
 222
 223                 // For specific cultures it basically returns LCID.
 224                 // For neutral cultures it is mapped to the default(?) specific
 225                 // culture, where the LCID of the specific culture seems to be
 226                 // n + 1024 by default. zh-CHS is the only exception which is
 227                 // mapped to 2052, not 1028 (zh-CHT is mapped to 1028 instead).
 228                 // There are very few exceptions, here I simply list them here.
 229                 // It is Windows-specific property anyways, so no worthy of
 230                 // trying to do some complex things with locale-builder.
 231                 [ComVisible (false)]
 232                 public virtual int KeyboardLayoutId {
 233                         get {
 234                                 switch (LCID) {
 235                                 case 4: // zh-CHS (neutral)
 236                                         return 2052;
 237                                 case 1034: // es-ES Spanish 2
 238                                         return 3082;
 239                                 case 31748: // zh-CHT (neutral)
 240                                         return 1028;
 241                                 case 31770: // sr (neutral)
 242                                         return 2074;
 243                                 default:
 244                                         return LCID < 1024 ? LCID + 1024 : LCID;
 245                                 }
 246                         }
 247                 }
 248 #endif
 249
 250                 public virtual int LCID {
 251                         get {
 252                                 return cultureID;
 253                         }
 254                 }
 255
 256                 public virtual string Name {
 257                         get {
 258                                 return(m_name);
 259                         }
 260                 }
 261
 262                 public virtual string NativeName {
 263                         get {
 264                                 if (!constructed) Construct ();
 265                                 return nativename;
 266                         }
 267                 }
 268
 269                 internal string NativeCalendarName {
 270                         get {
 271                                 if (!constructed) Construct ();
 272                                 return native_calendar_names[(default_calendar_type >> CalendarTypeBits) - 1];
 273                         }
 274                 }
 275
 276                 public virtual Calendar Calendar {
 277                         get {
 278                                 if (calendar == null) {
 279                                         if (!constructed) Construct ();
 280                                         calendar = CreateCalendar (default_calendar_type);
 281                                 }
 282
 283                                 return calendar;
 284                         }
 285                 }
 286
 287                 [MonoLimitation ("Optional calendars are not supported only default calendar is returned")]
 288                 public virtual Calendar[] OptionalCalendars {
 289                         get {
 290                                 return new[] { Calendar };
 291                         }
 292                 }
 293
 294                 public virtual CultureInfo Parent
 295                 {
 296                         get {
 297                                 if (parent_culture == null) {
 298                                         if (!constructed)
 299                                                 Construct ();
 300                                         if (parent_lcid == cultureID) {
 301                                                 //
 302                                                 // Parent lcid is same but culture info is not for legacy zh culture
 303                                                 //
 304                                                 if (parent_lcid == 0x7C04 && EnglishName [EnglishName.Length - 1] == 'y')
 305                                                         return parent_culture = new CultureInfo ("zh-Hant");
 306                                                 else if (parent_lcid == 0x0004 && EnglishName [EnglishName.Length -1] == 'y')
 307                                                         return parent_culture = new CultureInfo ("zh-Hans");
 308                                                 return null;
 309                                         }
 310
 311                                         if (parent_lcid == InvariantCultureId)
 312                                                 parent_culture = InvariantCulture;
 313                                         else if (cultureID == InvariantCultureId)
 314                                                 parent_culture = this;
 315                                         else if (cultureID == 0x0404) {
 316                                                 // zh-tw has parent id 0x7C04 which is in this case zh-cht and not zh-hant
 317                                                 parent_culture = new CultureInfo ("zh-CHT");
 318                                         } else
 319                                                 parent_culture = new CultureInfo (parent_lcid);
 320                                 }
 321                                 return parent_culture;
 322                         }
 323                 }
 324
 325                 public virtual TextInfo TextInfo
 326                 {
 327                         get {
 328                                 if (textInfo == null) {
 329                                         if (!constructed) Construct ();
 330                                         lock (this) {
 331                                                 if(textInfo == null) {
 332                                                         textInfo = CreateTextInfo (m_isReadOnly);
 333                                                 }
 334                                         }
 335                                 }
 336
 337                                 return(textInfo);
 338                         }
 339                 }
 340
 341                 public virtual string ThreeLetterISOLanguageName {
 342                         get {
 343                                 if (!constructed) Construct ();
 344                                 return iso3lang;
 345                         }
 346                 }
 347
 348                 public virtual string ThreeLetterWindowsLanguageName
 349                 {
 350                         get {
 351                                 if (!constructed) Construct ();
 352                                 return(win3lang);
 353                         }
 354                 }
 355
 356                 public virtual string TwoLetterISOLanguageName {
 357                         get {
 358                                 if (!constructed) Construct ();
 359                                 return(iso2lang);
 360                         }
 361                 }
 362
 363                 public bool UseUserOverride
 364                 {
 365                         get {
 366                                 return m_useUserOverride;
 367                         }
 368                 }
 369
 370                 public void ClearCachedData()
 371                 {
 372                         lock (shared_table_lock) {
 373                                 shared_by_number = null;
 374                                 shared_by_name = null;
 375                         }
 376
 377                         //
 378                         // ClearCachedData method does not refresh the information in
 379                         // the Thread.CurrentCulture property for existing threads
 380                         //
 381                         default_current_culture = null;
 382
 383                         RegionInfo.ClearCachedData ();
 384                         TimeZone.ClearCachedData ();
 385                         TimeZoneInfo.ClearCachedData ();
 386                 }
 387
 388                 public virtual object Clone()
 389                 {
 390                         if (!constructed) Construct ();
 391                         CultureInfo ci=(CultureInfo)MemberwiseClone ();
 392                         ci.m_isReadOnly=false;
 393                         ci.cached_serialized_form=null;
 394                         if (!IsNeutralCulture) {
 395                                 ci.NumberFormat = (NumberFormatInfo)NumberFormat.Clone ();
 396                                 ci.DateTimeFormat = (DateTimeFormatInfo)DateTimeFormat.Clone ();
 397                         }
 398                         return(ci);
 399                 }
 400
 401                 public override bool Equals (object value)
 402                 {
 403                         CultureInfo b = value as CultureInfo;
 404
 405                         if (b != null)
 406                                 return b.cultureID == cultureID;
 407                         return false;
 408                 }
 409
 410                 public static CultureInfo[] GetCultures(CultureTypes types)
 411                 {
 412                         bool neutral=((types & CultureTypes.NeutralCultures)!=0);
 413                         bool specific=((types & CultureTypes.SpecificCultures)!=0);
 414                         bool installed=((types & CultureTypes.InstalledWin32Cultures)!=0);  // TODO
 415
 416                         CultureInfo [] infos = internal_get_cultures (neutral, specific, installed);
 417                         // The runtime returns a NULL in the first position of the array when
 418                         // 'neutral' is true. We fill it in with a clone of InvariantCulture
 419                         // since it must not be read-only
 420                         if (neutral && infos.Length > 0 && infos [0] == null) {
 421                                 infos [0] = (CultureInfo) InvariantCulture.Clone ();
 422                         }
 423
 424                         for (int i = 1; i < infos.Length; ++i) {
 425                                 var ci = infos [i];
 426                                 infos [i].m_cultureData = CultureData.GetCultureData (ci.m_name, false, ci.datetime_index, ci.CalendarType, ci.number_index, ci.iso2lang);
 427                         }
 428
 429                         return infos;
 430                 }
 431
 432                 public override int GetHashCode ()
 433                 {
 434                         return cultureID.GetHashCode ();
 435                 }
 436
 437                 public static CultureInfo ReadOnly(CultureInfo ci)
 438                 {
 439                         if(ci==null) {
 440                                 throw new ArgumentNullException("ci");
 441                         }
 442
 443                         if(ci.m_isReadOnly) {
 444                                 return(ci);
 445                         } else {
 446                                 CultureInfo new_ci=(CultureInfo)ci.Clone ();
 447                                 new_ci.m_isReadOnly=true;
 448                                 if (new_ci.numInfo != null)
 449                                         new_ci.numInfo = NumberFormatInfo.ReadOnly (new_ci.numInfo);
 450                                 if (new_ci.dateTimeInfo != null)
 451                                         new_ci.dateTimeInfo = DateTimeFormatInfo.ReadOnly (new_ci.dateTimeInfo);
 452                                 if (new_ci.textInfo != null)
 453                                         new_ci.textInfo = TextInfo.ReadOnly (new_ci.textInfo);
 454                                 return(new_ci);
 455                         }
 456                 }
 457
 458                 public override string ToString()
 459                 {
 460                         return(m_name);
 461                 }
 462
 463                 public virtual CompareInfo CompareInfo
 464                 {
 465                         get {
 466                                 if(compareInfo==null) {
 467                                         if (!constructed)
 468                                                 Construct ();
 469
 470                                         lock (this) {
 471                                                 if(compareInfo==null) {
 472                                                         compareInfo=new CompareInfo (this);
 473                                                 }
 474                                         }
 475                                 }
 476
 477                                 return(compareInfo);
 478                         }
 479                 }
 480
 481                 public virtual bool IsNeutralCulture {
 482                         get {
 483                                 if (cultureID == InvariantCultureId)
 484                                         return false;
 485
 486                                 if (!constructed) Construct ();
 487                                 return territory == null;
 488                         }
 489                 }
 490
 491                 internal void CheckNeutral ()
 492                 {
 493                 }
 494
 495                 public virtual NumberFormatInfo NumberFormat {
 496                         get {
 497                                 if (numInfo == null) {
 498                                         NumberFormatInfo temp = new NumberFormatInfo(this.m_cultureData);
 499                                         temp.isReadOnly = m_isReadOnly;
 500                                         numInfo = temp;
 501                                 }
 502
 503                                 return numInfo;
 504                         }
 505
 506                         set {
 507                                 if (!constructed) Construct ();
 508                                 if (m_isReadOnly) throw new InvalidOperationException(MSG_READONLY);
 509
 510                                 if (value == null)
 511                                         throw new ArgumentNullException ("NumberFormat");
 512
 513                                 numInfo = value;
 514                         }
 515                 }
 516
 517                 public virtual DateTimeFormatInfo DateTimeFormat {
 518                         get {
 519                                 if (dateTimeInfo != null)
 520                                         return dateTimeInfo;
 521
 522                                 if (!constructed) Construct ();
 523                                 CheckNeutral ();
 524
 525                                 var temp = new DateTimeFormatInfo (m_cultureData, Calendar);
 526                                 temp.m_isReadOnly = m_isReadOnly;
 527                                 System.Threading.Thread.MemoryBarrier();
 528                                 dateTimeInfo = temp;
 529                                 return dateTimeInfo;
 530                         }
 531
 532                         set {
 533                                 if (!constructed) Construct ();
 534                                 if (m_isReadOnly) throw new InvalidOperationException(MSG_READONLY);
 535
 536                                 if (value == null)
 537                                         throw new ArgumentNullException ("DateTimeFormat");
 538
 539                                 dateTimeInfo = value;
 540                         }
 541                 }
 542
 543                 public virtual string DisplayName {
 544                         get {
 545                                 // Mono is not localized and will always return english name regardless of OS locale
 546                                 return EnglishName;
 547                         }
 548                 }
 549
 550                 public virtual string EnglishName {
 551                         get {
 552                                 if (!constructed) Construct ();
 553                                 return englishname;
 554                         }
 555                 }
 556
 557                 public static CultureInfo InstalledUICulture {
 558                         get {
 559                                 return ConstructCurrentCulture ();
 560                         }
 561                 }
 562
 563                 public bool IsReadOnly {
 564                         get {
 565                                 return m_isReadOnly;
 566                         }
 567                 }
 568
 569
 570                 //
 571                 // IFormatProvider implementation
 572                 //
 573                 public virtual object GetFormat( Type formatType )
 574                 {
 575                         object format = null;
 576
 577                         if ( formatType == typeof(NumberFormatInfo) )
 578                                 format = NumberFormat;
 579                         else if ( formatType == typeof(DateTimeFormatInfo) )
 580                                 format = DateTimeFormat;
 581
 582                         return format;
 583                 }
 584
 585                 void Construct ()
 586                 {
 587                         construct_internal_locale_from_lcid (cultureID);
 588                         constructed = true;
 589                 }
 590
 591                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 592                 private extern bool construct_internal_locale_from_lcid (int lcid);
 593
 594                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 595                 private extern bool construct_internal_locale_from_name (string name);
 596
 597                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 598                 private extern static string get_current_locale_name ();
 599
 600                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 601                 private extern static CultureInfo [] internal_get_cultures (bool neutral, bool specific, bool installed);
 602
 603                 private void ConstructInvariant (bool read_only)
 604                 {
 605                         cultureID = InvariantCultureId;
 606
 607                         /* NumberFormatInfo defaults to the invariant data */
 608                         numInfo=NumberFormatInfo.InvariantInfo;
 609
 610                         if (!read_only) {
 611                                 numInfo = (NumberFormatInfo) numInfo.Clone ();
 612                         }
 613
 614                         textInfo = CreateTextInfo (read_only);
 615
 616                         m_name=String.Empty;
 617                         englishname=
 618                         nativename="Invariant Language (Invariant Country)";
 619                         iso3lang="IVL";
 620                         iso2lang="iv";
 621                         win3lang="IVL";
 622                         default_calendar_type = 1 << CalendarTypeBits | (int) GregorianCalendarTypes.Localized;
 623                 }
 624
 625                 private unsafe TextInfo CreateTextInfo (bool readOnly)
 626                 {
 627                         return new TextInfo (this, cultureID, this.textinfo_data, readOnly);
 628                 }
 629
 630                 public CultureInfo (int culture) : this (culture, true) {}
 631
 632                 public CultureInfo (int culture, bool useUserOverride) :
 633                         this (culture, useUserOverride, false) {}
 634
 635                 private CultureInfo (int culture, bool useUserOverride, bool read_only)
 636                 {
 637                         if (culture < 0)
 638                                 throw new ArgumentOutOfRangeException ("culture", "Positive "
 639                                         + "number required.");
 640
 641                         constructed = true;
 642                         m_isReadOnly = read_only;
 643                         m_useUserOverride = useUserOverride;
 644
 645                         if (culture == InvariantCultureId) {
 646                                 /* Short circuit the invariant culture */
 647                                 ConstructInvariant (read_only);
 648                                 m_cultureData = CultureData.Invariant;
 649                                 return;
 650                         }
 651
 652                         if (!construct_internal_locale_from_lcid (culture)) {
 653                                 //
 654                                 // Be careful not to cause recursive CultureInfo initialization
 655                                 //
 656                                 var msg = string.Format (InvariantCulture, "Culture ID {0} (0x{1}) is not a supported culture.", culture.ToString (InvariantCulture), culture.ToString ("X4", InvariantCulture));
 657                                 throw new CultureNotFoundException ("culture", msg);
 658                         }
 659
 660                         m_cultureData = CultureData.GetCultureData (m_name, m_useUserOverride, datetime_index, CalendarType, number_index, iso2lang);
 661                 }
 662
 663                 public CultureInfo (string name) : this (name, true) {}
 664
 665                 public CultureInfo (string name, bool useUserOverride) :
 666                         this (name, useUserOverride, false) {}
 667
 668                 private CultureInfo (string name, bool useUserOverride, bool read_only)
 669                 {
 670                         if (name == null)
 671                                 throw new ArgumentNullException ("name");
 672
 673                         constructed = true;
 674                         m_isReadOnly = read_only;
 675                         m_useUserOverride = useUserOverride;
 676                         m_isInherited = GetType() != typeof(System.Globalization.CultureInfo);
 677
 678                         if (name.Length == 0) {
 679                                 /* Short circuit the invariant culture */
 680                                 ConstructInvariant (read_only);
 681                                 m_cultureData = CultureData.Invariant;
 682                                 return;
 683                         }
 684
 685                         if (!construct_internal_locale_from_name (name.ToLowerInvariant ())) {
 686                                 throw CreateNotFoundException (name);
 687                         }
 688
 689                         m_cultureData = CultureData.GetCultureData (m_name, useUserOverride, datetime_index, CalendarType, number_index, iso2lang);
 690                 }
 691
 692                 // This is used when creating by specific name and creating by
 693                 // current locale so we can initialize the object without
 694                 // doing any member initialization
 695                 private CultureInfo () { constructed = true; }
 696                 static Dictionary<int, CultureInfo> shared_by_number;
 697                 static Dictionary<string, CultureInfo> shared_by_name;
 698
 699                 static void insert_into_shared_tables (CultureInfo c)
 700                 {
 701                         if (shared_by_number == null){
 702                                 shared_by_number = new Dictionary<int, CultureInfo> ();
 703                                 shared_by_name = new Dictionary<string, CultureInfo> ();
 704                         }
 705                         shared_by_number [c.cultureID] = c;
 706                         shared_by_name [c.m_name] = c;
 707                 }
 708
 709                 public static CultureInfo GetCultureInfo (int culture)
 710                 {
 711                         CultureInfo c;
 712
 713                         lock (shared_table_lock){
 714                                 if (shared_by_number != null) {
 715                                         if (shared_by_number.TryGetValue (culture, out c))
 716                                                 return c;
 717                                 }
 718
 719                                 c = new CultureInfo (culture, false, true);
 720                                 insert_into_shared_tables (c);
 721                                 return c;
 722                         }
 723                 }
 724
 725                 public static CultureInfo GetCultureInfo (string name)
 726                 {
 727                         if (name == null)
 728                                 throw new ArgumentNullException ("name");
 729
 730                         CultureInfo c;
 731                         lock (shared_table_lock){
 732                                 if (shared_by_name != null){
 733                                         if (shared_by_name.TryGetValue (name, out c))
 734                                                 return c;
 735                                 }
 736                                 c = new CultureInfo (name, false, true);
 737                                 insert_into_shared_tables (c);
 738                                 return c;
 739                         }
 740                 }
 741
 742                 [MonoTODO ("Currently it ignores the altName parameter")]
 743                 public static CultureInfo GetCultureInfo (string name, string altName) {
 744                         if (name == null)
 745                                 throw new ArgumentNullException ("null");
 746                         if (altName == null)
 747                                 throw new ArgumentNullException ("null");
 748
 749                         return GetCultureInfo (name);
 750                 }
 751
 752                 public static CultureInfo GetCultureInfoByIetfLanguageTag (string name)
 753                 {
 754                         // There could be more consistent way to implement
 755                         // it, but right now it works just fine with this...
 756                         switch (name) {
 757                         case "zh-Hans":
 758                                 return GetCultureInfo ("zh-CHS");
 759                         case "zh-Hant":
 760                                 return GetCultureInfo ("zh-CHT");
 761                         default:
 762                                 return GetCultureInfo (name);
 763                         }
 764                 }
 765
 766                 // used in runtime (icall.c) to construct CultureInfo for
 767                 // AssemblyName of assemblies
 768                 internal static CultureInfo CreateCulture (string name, bool reference)
 769                 {
 770                         bool read_only;
 771                         bool use_user_override;
 772
 773                         bool invariant = name.Length == 0;
 774                         if (reference) {
 775                                 use_user_override = invariant ? false : true;
 776                                 read_only = false;
 777                         } else {
 778                                 read_only = false;
 779                                 use_user_override = invariant ? false : true;
 780                         }
 781
 782                         return new CultureInfo (name, use_user_override, read_only);
 783                 }
 784
 785                 public static CultureInfo CreateSpecificCulture (string name)
 786                 {
 787                         if (name == null)
 788                                 throw new ArgumentNullException ("name");
 789
 790                         if (name.Length == 0)
 791                                 return InvariantCulture;
 792
 793                         var src_name = name;
 794                         name = name.ToLowerInvariant ();
 795                         CultureInfo ci = new CultureInfo ();
 796
 797                         if (!ci.construct_internal_locale_from_name (name)) {
 798                                 int idx = name.IndexOf ('-');
 799                                 if (idx < 1 || !ci.construct_internal_locale_from_name (name.Substring (0, idx)))
 800                                         throw CreateNotFoundException (src_name);
 801                         }
 802
 803                         if (ci.IsNeutralCulture)
 804                                 ci = CreateSpecificCultureFromNeutral (ci.Name);
 805
 806                         ci.m_cultureData = CultureData.GetCultureData (ci.m_name, false, ci.datetime_index, ci.CalendarType, ci.number_index, ci.iso2lang);
 807                         return ci;
 808                 }
 809
 810                 //
 811                 // Creates specific culture from neutral culture. Used by CreateSpecificCulture
 812                 // only but using separate method we can delay switch underlying Dictionary
 813                 // initialization
 814                 //
 815                 static CultureInfo CreateSpecificCultureFromNeutral (string name)
 816                 {
 817                         int id;
 818
 819                         //
 820                         // For neutral cultures find predefined default specific culture
 821                         //
 822                         // Use managed switch because we need this for only some cultures
 823                         // and the method is not used frequently
 824                         //
 825                         // TODO: We could optimize for cultures with single specific culture
 826                         //
 827                         switch (name.ToLowerInvariant ()) {
 828                         case "af": id = 1078; break;
 829                         case "am": id = 1118; break;
 830                         case "ar": id = 1025; break;
 831                         case "arn": id = 1146; break;
 832                         case "as": id = 1101; break;
 833                         case "az": id = 1068; break;
 834                         case "az-cyrl": id = 2092; break;
 835                         case "az-latn": id = 1068; break;
 836                         case "ba": id = 1133; break;
 837                         case "be": id = 1059; break;
 838                         case "bg": id = 1026; break;
 839                         case "bn": id = 1093; break;
 840                         case "bo": id = 1105; break;
 841                         case "br": id = 1150; break;
 842                         case "bs": id = 5146; break;
 843                         case "bs-cyrl": id = 8218; break;
 844                         case "bs-latn": id = 5146; break;
 845                         case "ca": id = 1027; break;
 846                         case "co": id = 1155; break;
 847                         case "cs": id = 1029; break;
 848                         case "cy": id = 1106; break;
 849                         case "da": id = 1030; break;
 850                         case "de": id = 1031; break;
 851                         case "dsb": id = 2094; break;
 852                         case "dv": id = 1125; break;
 853                         case "el": id = 1032; break;
 854                         case "en": id = 1033; break;
 855                         case "es": id = 3082; break;
 856                         case "et": id = 1061; break;
 857                         case "eu": id = 1069; break;
 858                         case "fa": id = 1065; break;
 859                         case "fi": id = 1035; break;
 860                         case "fil": id = 1124; break;
 861                         case "fo": id = 1080; break;
 862                         case "fr": id = 1036; break;
 863                         case "fy": id = 1122; break;
 864                         case "ga": id = 2108; break;
 865                         case "gd": id = 1169; break;
 866                         case "gl": id = 1110; break;
 867                         case "gsw": id = 1156; break;
 868                         case "gu": id = 1095; break;
 869                         case "ha": id = 1128; break;
 870                         case "ha-latn": id = 1128; break;
 871                         case "he": id = 1037; break;
 872                         case "hi": id = 1081; break;
 873                         case "hr": id = 1050; break;
 874                         case "hsb": id = 1070; break;
 875                         case "hu": id = 1038; break;
 876                         case "hy": id = 1067; break;
 877                         case "id": id = 1057; break;
 878                         case "ig": id = 1136; break;
 879                         case "ii": id = 1144; break;
 880                         case "is": id = 1039; break;
 881                         case "it": id = 1040; break;
 882                         case "iu": id = 2141; break;
 883                         case "iu-cans": id = 1117; break;
 884                         case "iu-latn": id = 2141; break;
 885                         case "ja": id = 1041; break;
 886                         case "ka": id = 1079; break;
 887                         case "kk": id = 1087; break;
 888                         case "kl": id = 1135; break;
 889                         case "km": id = 1107; break;
 890                         case "kn": id = 1099; break;
 891                         case "ko": id = 1042; break;
 892                         case "kok": id = 1111; break;
 893                         case "ky": id = 1088; break;
 894                         case "lb": id = 1134; break;
 895                         case "lo": id = 1108; break;
 896                         case "lt": id = 1063; break;
 897                         case "lv": id = 1062; break;
 898                         case "mi": id = 1153; break;
 899                         case "mk": id = 1071; break;
 900                         case "ml": id = 1100; break;
 901                         case "mn": id = 1104; break;
 902                         case "mn-cyrl": id = 1104; break;
 903                         case "mn-mong": id = 2128; break;
 904                         case "moh": id = 1148; break;
 905                         case "mr": id = 1102; break;
 906                         case "ms": id = 1086; break;
 907                         case "mt": id = 1082; break;
 908                         case "nb": id = 1044; break;
 909                         case "ne": id = 1121; break;
 910                         case "nl": id = 1043; break;
 911                         case "nn": id = 2068; break;
 912                         case "no": id = 1044; break;
 913                         case "nso": id = 1132; break;
 914                         case "oc": id = 1154; break;
 915                         case "or": id = 1096; break;
 916                         case "pa": id = 1094; break;
 917                         case "pl": id = 1045; break;
 918                         case "prs": id = 1164; break;
 919                         case "ps": id = 1123; break;
 920                         case "pt": id = 1046; break;
 921                         case "qut": id = 1158; break;
 922                         case "quz": id = 1131; break;
 923                         case "rm": id = 1047; break;
 924                         case "ro": id = 1048; break;
 925                         case "ru": id = 1049; break;
 926                         case "rw": id = 1159; break;
 927                         case "sa": id = 1103; break;
 928                         case "sah": id = 1157; break;
 929                         case "se": id = 1083; break;
 930                         case "si": id = 1115; break;
 931                         case "sk": id = 1051; break;
 932                         case "sl": id = 1060; break;
 933                         case "sma": id = 7227; break;
 934                         case "smj": id = 5179; break;
 935                         case "smn": id = 9275; break;
 936                         case "sms": id = 8251; break;
 937                         case "sq": id = 1052; break;
 938                         case "sr": id = 9242; break;
 939                         case "sr-cyrl": id = 10266; break;
 940                         case "sr-latn": id = 9242; break;
 941                         case "sv": id = 1053; break;
 942                         case "sw": id = 1089; break;
 943                         case "syr": id = 1114; break;
 944                         case "ta": id = 1097; break;
 945                         case "te": id = 1098; break;
 946                         case "tg": id = 1064; break;
 947                         case "tg-cyrl": id = 1064; break;
 948                         case "th": id = 1054; break;
 949                         case "tk": id = 1090; break;
 950                         case "tn": id = 1074; break;
 951                         case "tr": id = 1055; break;
 952                         case "tt": id = 1092; break;
 953                         case "tzm": id = 2143; break;
 954                         case "tzm-latn": id = 2143; break;
 955                         case "ug": id = 1152; break;
 956                         case "uk": id = 1058; break;
 957                         case "ur": id = 1056; break;
 958                         case "uz": id = 1091; break;
 959                         case "uz-cyrl": id = 2115; break;
 960                         case "uz-latn": id = 1091; break;
 961                         case "vi": id = 1066; break;
 962                         case "wo": id = 1160; break;
 963                         case "xh": id = 1076; break;
 964                         case "yo": id = 1130; break;
 965                         case "zh": id = 2052; break;
 966                         case "zh-chs":
 967                         case "zh-hans":
 968                                 id = 2052; break;
 969                         case "zh-cht":
 970                         case "zh-hant":
 971                                 id = 3076; break;
 972                         case "zu": id = 1077; break;
 973                         default:
 974                                 throw new NotImplementedException ("Mapping for neutral culture " + name);
 975                         }
 976
 977                         return new CultureInfo (id);
 978                 }
 979
 980                 internal int CalendarType {
 981                         get {
 982                                 switch (default_calendar_type >> CalendarTypeBits) {
 983                                 case 1:
 984                                         return Calendar.CAL_GREGORIAN;
 985                                 case 2:
 986                                         return Calendar.CAL_THAI;
 987                                 case 3:
 988                                         return Calendar.CAL_UMALQURA;
 989                                 case 4:
 990                                         return Calendar.CAL_HIJRI;
 991                                 default:
 992                                         throw new NotImplementedException ("CalendarType");
 993                                 }
 994                         }
 995                 }
 996
 997                 static Calendar CreateCalendar (int calendarType)
 998                 {
 999                         string name = null;
1000                         switch (calendarType >> CalendarTypeBits) {
1001                         case 1:
1002                                 GregorianCalendarTypes greg_type;
1003                                 greg_type = (GregorianCalendarTypes) (calendarType & 0xFF);
1004                                 return new GregorianCalendar (greg_type);
1005                         case 2:
1006                                 name = "System.Globalization.ThaiBuddhistCalendar";
1007                                 break;
1008                         case 3:
1009                                 name = "System.Globalization.UmAlQuraCalendar";
1010                                 break;
1011                         case 4:
1012                                 name = "System.Globalization.HijriCalendar";
1013                                 break;
1014                         default:
1015                                 throw new NotImplementedException ("Unknown calendar type: " + calendarType);
1016                         }
1017
1018                         Type type = Type.GetType (name, false);
1019                         if (type == null)
1020                                 return new GregorianCalendar (GregorianCalendarTypes.Localized); // return invariant calendar if not found
1021                         return (Calendar) Activator.CreateInstance (type);
1022                 }
1023
1024                 static Exception CreateNotFoundException (string name)
1025                 {
1026                         return new CultureNotFoundException ("name", "Culture name " + name + " is not supported.");
1027                 }
1028
1029                 public static CultureInfo DefaultThreadCurrentCulture {
1030                         get {
1031                                 return Thread.default_culture;
1032                         }
1033                         set {
1034                                 Thread.default_culture = value;
1035                         }
1036                 }
1037
1038                 public static CultureInfo DefaultThreadCurrentUICulture {
1039                         get {
1040                                 return Thread.default_ui_culture;
1041                         }
1042                         set {
1043                                 Thread.default_ui_culture = value;
1044                         }
1045                 }
1046
1047                 internal string SortName {
1048                         get {
1049                                 return m_name;
1050                         }
1051                 }
1052
1053 #region reference sources
1054                 // TODO:
1055                 internal static readonly bool IsTaiwanSku;
1056
1057         //
1058         // CheckDomainSafetyObject throw if the object is customized object which cannot be attached to
1059         // other object (like CultureInfo or DateTimeFormatInfo).
1060         //
1061
1062         internal static void CheckDomainSafetyObject(Object obj, Object container)
1063         {
1064             if (obj.GetType().Assembly != typeof(System.Globalization.CultureInfo).Assembly) {
1065
1066                 throw new InvalidOperationException(
1067                             String.Format(
1068                                 CultureInfo.CurrentCulture,
1069                                 Environment.GetResourceString("InvalidOperation_SubclassedObject"),
1070                                 obj.GetType(),
1071                                 container.GetType()));
1072             }
1073             Contract.EndContractBlock();
1074         }
1075
1076         // For resource lookup, we consider a culture the invariant culture by name equality.
1077         // We perform this check frequently during resource lookup, so adding a property for
1078         // improved readability.
1079         internal bool HasInvariantCultureName
1080         {
1081             get { return Name == CultureInfo.InvariantCulture.Name; }
1082         }
1083
1084         internal static bool VerifyCultureName(String cultureName, bool throwException)
1085         {
1086             // This function is used by ResourceManager.GetResourceFileName().
1087             // ResourceManager searches for resource using CultureInfo.Name,
1088             // so we should check against CultureInfo.Name.
1089
1090             for (int i=0; i<cultureName.Length; i++) {
1091                 char c = cultureName[i];
1092                 //
1093
1094                 if (Char.IsLetterOrDigit(c) || c=='-' || c=='_') {
1095                     continue;
1096                 }
1097                 if (throwException) {
1098                     throw new ArgumentException(Environment.GetResourceString("Argument_InvalidResourceCultureName", cultureName));
1099                 }
1100                 return false;
1101             }
1102             return true;
1103         }
1104
1105 #endregion
1106         }
1107 }