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
 303                                                 return null;
 304                                         }
 305
 306                                         if (parent_lcid == InvariantCultureId)
 307                                                 parent_culture = InvariantCulture;
 308                                         else if (cultureID == InvariantCultureId)
 309                                                 parent_culture = this;
 310                                         else if (cultureID == 0x0404) {
 311                                                 // zh-tw has parent id 0x7C04 which is in this case zh-cht and not zh-hant
 312                                                 parent_culture = new CultureInfo ("zh-CHT");
 313                                         } else
 314                                                 parent_culture = new CultureInfo (parent_lcid);
 315                                 }
 316                                 return parent_culture;
 317                         }
 318                 }
 319
 320                 public virtual TextInfo TextInfo
 321                 {
 322                         get {
 323                                 if (textInfo == null) {
 324                                         if (!constructed) Construct ();
 325                                         lock (this) {
 326                                                 if(textInfo == null) {
 327                                                         textInfo = CreateTextInfo (m_isReadOnly);
 328                                                 }
 329                                         }
 330                                 }
 331
 332                                 return(textInfo);
 333                         }
 334                 }
 335
 336                 public virtual string ThreeLetterISOLanguageName {
 337                         get {
 338                                 if (!constructed) Construct ();
 339                                 return iso3lang;
 340                         }
 341                 }
 342
 343                 public virtual string ThreeLetterWindowsLanguageName
 344                 {
 345                         get {
 346                                 if (!constructed) Construct ();
 347                                 return(win3lang);
 348                         }
 349                 }
 350
 351                 public virtual string TwoLetterISOLanguageName {
 352                         get {
 353                                 if (!constructed) Construct ();
 354                                 return(iso2lang);
 355                         }
 356                 }
 357
 358                 public bool UseUserOverride
 359                 {
 360                         get {
 361                                 return m_useUserOverride;
 362                         }
 363                 }
 364
 365                 public void ClearCachedData()
 366                 {
 367                         lock (shared_table_lock) {
 368                                 shared_by_number = null;
 369                                 shared_by_name = null;
 370                         }
 371
 372                         //
 373                         // ClearCachedData method does not refresh the information in
 374                         // the Thread.CurrentCulture property for existing threads
 375                         //
 376                         default_current_culture = null;
 377
 378                         RegionInfo.ClearCachedData ();
 379                         TimeZone.ClearCachedData ();
 380 #if NET_4_5
 381                         TimeZoneInfo.ClearCachedData ();
 382 #endif
 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 #if !NET_4_0
 486                         if (IsNeutralCulture) {
 487                                 throw new NotSupportedException ("Culture \"" + m_name + "\" is " +
 488                                                 "a neutral culture. It can not be used in formatting " +
 489                                                 "and parsing and therefore cannot be set as the thread's " +
 490                                                 "current culture.");
 491                         }
 492 #endif
 493                 }
 494
 495                 public virtual NumberFormatInfo NumberFormat {
 496                         get {
 497                                 if (!constructed) Construct ();
 498                                 CheckNeutral ();
 499                                 if (numInfo == null){
 500                                         lock (this){
 501                                                 if (numInfo == null) {
 502                                                         numInfo = new NumberFormatInfo (m_isReadOnly);
 503                                                         construct_number_format ();
 504                                                 }
 505                                         }
 506                                 }
 507
 508                                 return numInfo;
 509                         }
 510
 511                         set {
 512                                 if (!constructed) Construct ();
 513                                 if (m_isReadOnly) throw new InvalidOperationException(MSG_READONLY);
 514
 515                                 if (value == null)
 516                                         throw new ArgumentNullException ("NumberFormat");
 517
 518                                 numInfo = value;
 519                         }
 520                 }
 521
 522                 public virtual DateTimeFormatInfo DateTimeFormat {
 523                         get {
 524                                 if (dateTimeInfo != null)
 525                                         return dateTimeInfo;
 526
 527                                 if (!constructed) Construct ();
 528                                 CheckNeutral ();
 529
 530                                 // TODO: Have to lock because construct_datetime_format is not atomic
 531                                 lock (this) {
 532                                         if (cultureID == InvariantCultureId && m_isReadOnly)
 533                                                 dateTimeInfo = DateTimeFormatInfo.InvariantInfo;
 534                                         else if (dateTimeInfo == null) {
 535                                                 dateTimeInfo = new DateTimeFormatInfo (this, m_isReadOnly);
 536                                                 if (cultureID != InvariantCultureId)
 537                                                         construct_datetime_format ();
 538                                         }
 539                                 }
 540
 541                                 return dateTimeInfo;
 542                         }
 543
 544                         set {
 545                                 if (!constructed) Construct ();
 546                                 if (m_isReadOnly) throw new InvalidOperationException(MSG_READONLY);
 547
 548                                 if (value == null)
 549                                         throw new ArgumentNullException ("DateTimeFormat");
 550
 551                                 dateTimeInfo = value;
 552                         }
 553                 }
 554
 555                 public virtual string DisplayName {
 556                         get {
 557                                 // Mono is not localized and will always return english name regardless of OS locale
 558                                 return EnglishName;
 559                         }
 560                 }
 561
 562                 public virtual string EnglishName {
 563                         get {
 564                                 if (!constructed) Construct ();
 565                                 return englishname;
 566                         }
 567                 }
 568
 569                 public static CultureInfo InstalledUICulture {
 570                         get {
 571                                 return ConstructCurrentCulture ();
 572                         }
 573                 }
 574
 575                 public bool IsReadOnly {
 576                         get {
 577                                 return m_isReadOnly;
 578                         }
 579                 }
 580
 581
 582                 //
 583                 // IFormatProvider implementation
 584                 //
 585                 public virtual object GetFormat( Type formatType )
 586                 {
 587                         object format = null;
 588
 589                         if ( formatType == typeof(NumberFormatInfo) )
 590                                 format = NumberFormat;
 591                         else if ( formatType == typeof(DateTimeFormatInfo) )
 592                                 format = DateTimeFormat;
 593
 594                         return format;
 595                 }
 596
 597                 void Construct ()
 598                 {
 599                         construct_internal_locale_from_lcid (cultureID);
 600                         constructed = true;
 601                 }
 602
 603                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 604                 private extern bool construct_internal_locale_from_lcid (int lcid);
 605
 606                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 607                 private extern bool construct_internal_locale_from_name (string name);
 608
 609                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 610                 private extern static string get_current_locale_name ();
 611
 612                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 613                 private extern static CultureInfo [] internal_get_cultures (bool neutral, bool specific, bool installed);
 614
 615                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 616                 private extern void construct_datetime_format ();
 617
 618                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 619                 private extern void construct_number_format ();
 620
 621                 private void ConstructInvariant (bool read_only)
 622                 {
 623                         cultureID = InvariantCultureId;
 624
 625                         /* NumberFormatInfo defaults to the invariant data */
 626                         numInfo=NumberFormatInfo.InvariantInfo;
 627
 628                         if (!read_only) {
 629                                 numInfo = (NumberFormatInfo) numInfo.Clone ();
 630                         }
 631
 632                         textInfo = CreateTextInfo (read_only);
 633
 634                         m_name=String.Empty;
 635                         englishname=
 636                         nativename="Invariant Language (Invariant Country)";
 637                         iso3lang="IVL";
 638                         iso2lang="iv";
 639                         win3lang="IVL";
 640                         default_calendar_type = 1 << CalendarTypeBits;
 641                 }
 642
 643                 private unsafe TextInfo CreateTextInfo (bool readOnly)
 644                 {
 645                         return new TextInfo (this, cultureID, this.textinfo_data, readOnly);
 646                 }
 647
 648                 public CultureInfo (int culture) : this (culture, true) {}
 649
 650                 public CultureInfo (int culture, bool useUserOverride) :
 651                         this (culture, useUserOverride, false) {}
 652
 653                 private CultureInfo (int culture, bool useUserOverride, bool read_only)
 654                 {
 655                         if (culture < 0)
 656                                 throw new ArgumentOutOfRangeException ("culture", "Positive "
 657                                         + "number required.");
 658
 659                         constructed = true;
 660                         m_isReadOnly = read_only;
 661                         m_useUserOverride = useUserOverride;
 662
 663                         if (culture == InvariantCultureId) {
 664                                 /* Short circuit the invariant culture */
 665                                 ConstructInvariant (read_only);
 666                                 return;
 667                         }
 668
 669                         if (!construct_internal_locale_from_lcid (culture)) {
 670                                 //
 671                                 // Be careful not to cause recursive CultureInfo initialization
 672                                 //
 673                                 var msg = string.Format (InvariantCulture, "Culture ID {0} (0x{0:X4}) is not a supported culture.", culture.ToString (InvariantCulture));
 674 #if NET_4_0
 675                                 throw new CultureNotFoundException ("culture", msg);
 676 #else
 677                                 throw new ArgumentException (msg, "culture");
 678 #endif
 679                         }
 680                 }
 681
 682                 public CultureInfo (string name) : this (name, true) {}
 683
 684                 public CultureInfo (string name, bool useUserOverride) :
 685                         this (name, useUserOverride, false) {}
 686
 687                 private CultureInfo (string name, bool useUserOverride, bool read_only)
 688                 {
 689                         if (name == null)
 690                                 throw new ArgumentNullException ("name");
 691
 692                         constructed = true;
 693                         m_isReadOnly = read_only;
 694                         m_useUserOverride = useUserOverride;
 695
 696                         if (name.Length == 0) {
 697                                 /* Short circuit the invariant culture */
 698                                 ConstructInvariant (read_only);
 699                                 return;
 700                         }
 701
 702                         if (!construct_internal_locale_from_name (name.ToLowerInvariant ())) {
 703                                 throw CreateNotFoundException (name);
 704                         }
 705                 }
 706
 707                 // This is used when creating by specific name and creating by
 708                 // current locale so we can initialize the object without
 709                 // doing any member initialization
 710                 private CultureInfo () { constructed = true; }
 711                 static Dictionary<int, CultureInfo> shared_by_number;
 712                 static Dictionary<string, CultureInfo> shared_by_name;
 713
 714                 static void insert_into_shared_tables (CultureInfo c)
 715                 {
 716                         if (shared_by_number == null){
 717                                 shared_by_number = new Dictionary<int, CultureInfo> ();
 718                                 shared_by_name = new Dictionary<string, CultureInfo> ();
 719                         }
 720                         shared_by_number [c.cultureID] = c;
 721                         shared_by_name [c.m_name] = c;
 722                 }
 723
 724                 public static CultureInfo GetCultureInfo (int culture)
 725                 {
 726                         CultureInfo c;
 727
 728                         lock (shared_table_lock){
 729                                 if (shared_by_number != null) {
 730                                         if (shared_by_number.TryGetValue (culture, out c))
 731                                                 return c;
 732                                 }
 733
 734                                 c = new CultureInfo (culture, false, true);
 735                                 insert_into_shared_tables (c);
 736                                 return c;
 737                         }
 738                 }
 739
 740                 public static CultureInfo GetCultureInfo (string name)
 741                 {
 742                         if (name == null)
 743                                 throw new ArgumentNullException ("name");
 744
 745                         CultureInfo c;
 746                         lock (shared_table_lock){
 747                                 if (shared_by_name != null){
 748                                         if (shared_by_name.TryGetValue (name, out c))
 749                                                 return c;
 750                                 }
 751                                 c = new CultureInfo (name, false, true);
 752                                 insert_into_shared_tables (c);
 753                                 return c;
 754                         }
 755                 }
 756
 757                 [MonoTODO ("Currently it ignores the altName parameter")]
 758                 public static CultureInfo GetCultureInfo (string name, string altName) {
 759                         if (name == null)
 760                                 throw new ArgumentNullException ("null");
 761                         if (altName == null)
 762                                 throw new ArgumentNullException ("null");
 763
 764                         return GetCultureInfo (name);
 765                 }
 766
 767                 public static CultureInfo GetCultureInfoByIetfLanguageTag (string name)
 768                 {
 769                         // There could be more consistent way to implement
 770                         // it, but right now it works just fine with this...
 771                         switch (name) {
 772                         case "zh-Hans":
 773                                 return GetCultureInfo ("zh-CHS");
 774                         case "zh-Hant":
 775                                 return GetCultureInfo ("zh-CHT");
 776                         default:
 777                                 return GetCultureInfo (name);
 778                         }
 779                 }
 780
 781                 // used in runtime (icall.c) to construct CultureInfo for
 782                 // AssemblyName of assemblies
 783                 internal static CultureInfo CreateCulture (string name, bool reference)
 784                 {
 785                         bool read_only;
 786                         bool use_user_override;
 787
 788                         bool invariant = name.Length == 0;
 789                         if (reference) {
 790                                 use_user_override = invariant ? false : true;
 791                                 read_only = false;
 792                         } else {
 793                                 read_only = false;
 794                                 use_user_override = invariant ? false : true;
 795                         }
 796
 797                         return new CultureInfo (name, use_user_override, read_only);
 798                 }
 799
 800                 public static CultureInfo CreateSpecificCulture (string name)
 801                 {
 802                         if (name == null)
 803                                 throw new ArgumentNullException ("name");
 804
 805                         if (name.Length == 0)
 806                                 return InvariantCulture;
 807
 808                         var src_name = name;
 809                         name = name.ToLowerInvariant ();
 810                         CultureInfo ci = new CultureInfo ();
 811
 812                         if (!ci.construct_internal_locale_from_name (name)) {
 813                                 int idx = name.IndexOf ('-');
 814                                 if (idx < 1 || !ci.construct_internal_locale_from_name (name.Substring (0, idx)))
 815                                         throw CreateNotFoundException (src_name);
 816                         }
 817
 818                         if (ci.IsNeutralCulture)
 819                                 ci = CreateSpecificCultureFromNeutral (ci.Name);
 820
 821                         return ci;
 822                 }
 823
 824                 //
 825                 // Creates specific culture from neutral culture. Used by CreateSpecificCulture
 826                 // only but using separate method we can delay switch underlying Dictionary
 827                 // initialization
 828                 //
 829                 static CultureInfo CreateSpecificCultureFromNeutral (string name)
 830                 {
 831                         int id;
 832
 833                         //
 834                         // For neutral cultures find predefined default specific culture
 835                         //
 836                         // Use managed switch because we need this for only some cultures
 837                         // and the method is not used frequently
 838                         //
 839                         // TODO: We could optimize for cultures with single specific culture
 840                         //
 841                         switch (name.ToLowerInvariant ()) {
 842                         case "af": id = 1078; break;
 843                         case "am": id = 1118; break;
 844                         case "ar": id = 1025; break;
 845                         case "arn": id = 1146; break;
 846                         case "as": id = 1101; break;
 847                         case "az": id = 1068; break;
 848                         case "az-cyrl": id = 2092; break;
 849                         case "az-latn": id = 1068; break;
 850                         case "ba": id = 1133; break;
 851                         case "be": id = 1059; break;
 852                         case "bg": id = 1026; break;
 853                         case "bn": id = 1093; break;
 854                         case "bo": id = 1105; break;
 855                         case "br": id = 1150; break;
 856                         case "bs": id = 5146; break;
 857                         case "bs-cyrl": id = 8218; break;
 858                         case "bs-latn": id = 5146; break;
 859                         case "ca": id = 1027; break;
 860                         case "co": id = 1155; break;
 861                         case "cs": id = 1029; break;
 862                         case "cy": id = 1106; break;
 863                         case "da": id = 1030; break;
 864                         case "de": id = 1031; break;
 865                         case "dsb": id = 2094; break;
 866                         case "dv": id = 1125; break;
 867                         case "el": id = 1032; break;
 868                         case "en": id = 1033; break;
 869                         case "es": id = 3082; break;
 870                         case "et": id = 1061; break;
 871                         case "eu": id = 1069; break;
 872                         case "fa": id = 1065; break;
 873                         case "fi": id = 1035; break;
 874                         case "fil": id = 1124; break;
 875                         case "fo": id = 1080; break;
 876                         case "fr": id = 1036; break;
 877                         case "fy": id = 1122; break;
 878                         case "ga": id = 2108; break;
 879                         case "gd": id = 1169; break;
 880                         case "gl": id = 1110; break;
 881                         case "gsw": id = 1156; break;
 882                         case "gu": id = 1095; break;
 883                         case "ha": id = 1128; break;
 884                         case "ha-latn": id = 1128; break;
 885                         case "he": id = 1037; break;
 886                         case "hi": id = 1081; break;
 887                         case "hr": id = 1050; break;
 888                         case "hsb": id = 1070; break;
 889                         case "hu": id = 1038; break;
 890                         case "hy": id = 1067; break;
 891                         case "id": id = 1057; break;
 892                         case "ig": id = 1136; break;
 893                         case "ii": id = 1144; break;
 894                         case "is": id = 1039; break;
 895                         case "it": id = 1040; break;
 896                         case "iu": id = 2141; break;
 897                         case "iu-cans": id = 1117; break;
 898                         case "iu-latn": id = 2141; break;
 899                         case "ja": id = 1041; break;
 900                         case "ka": id = 1079; break;
 901                         case "kk": id = 1087; break;
 902                         case "kl": id = 1135; break;
 903                         case "km": id = 1107; break;
 904                         case "kn": id = 1099; break;
 905                         case "ko": id = 1042; break;
 906                         case "kok": id = 1111; break;
 907                         case "ky": id = 1088; break;
 908                         case "lb": id = 1134; break;
 909                         case "lo": id = 1108; break;
 910                         case "lt": id = 1063; break;
 911                         case "lv": id = 1062; break;
 912                         case "mi": id = 1153; break;
 913                         case "mk": id = 1071; break;
 914                         case "ml": id = 1100; break;
 915                         case "mn": id = 1104; break;
 916                         case "mn-cyrl": id = 1104; break;
 917                         case "mn-mong": id = 2128; break;
 918                         case "moh": id = 1148; break;
 919                         case "mr": id = 1102; break;
 920                         case "ms": id = 1086; break;
 921                         case "mt": id = 1082; break;
 922                         case "nb": id = 1044; break;
 923                         case "ne": id = 1121; break;
 924                         case "nl": id = 1043; break;
 925                         case "nn": id = 2068; break;
 926                         case "no": id = 1044; break;
 927                         case "nso": id = 1132; break;
 928                         case "oc": id = 1154; break;
 929                         case "or": id = 1096; break;
 930                         case "pa": id = 1094; break;
 931                         case "pl": id = 1045; break;
 932                         case "prs": id = 1164; break;
 933                         case "ps": id = 1123; break;
 934                         case "pt": id = 1046; break;
 935                         case "qut": id = 1158; break;
 936                         case "quz": id = 1131; break;
 937                         case "rm": id = 1047; break;
 938                         case "ro": id = 1048; break;
 939                         case "ru": id = 1049; break;
 940                         case "rw": id = 1159; break;
 941                         case "sa": id = 1103; break;
 942                         case "sah": id = 1157; break;
 943                         case "se": id = 1083; break;
 944                         case "si": id = 1115; break;
 945                         case "sk": id = 1051; break;
 946                         case "sl": id = 1060; break;
 947                         case "sma": id = 7227; break;
 948                         case "smj": id = 5179; break;
 949                         case "smn": id = 9275; break;
 950                         case "sms": id = 8251; break;
 951                         case "sq": id = 1052; break;
 952                         case "sr": id = 9242; break;
 953                         case "sr-cyrl": id = 10266; break;
 954                         case "sr-latn": id = 9242; break;
 955                         case "sv": id = 1053; break;
 956                         case "sw": id = 1089; break;
 957                         case "syr": id = 1114; break;
 958                         case "ta": id = 1097; break;
 959                         case "te": id = 1098; break;
 960                         case "tg": id = 1064; break;
 961                         case "tg-cyrl": id = 1064; break;
 962                         case "th": id = 1054; break;
 963                         case "tk": id = 1090; break;
 964                         case "tn": id = 1074; break;
 965                         case "tr": id = 1055; break;
 966                         case "tt": id = 1092; break;
 967                         case "tzm": id = 2143; break;
 968                         case "tzm-latn": id = 2143; break;
 969                         case "ug": id = 1152; break;
 970                         case "uk": id = 1058; break;
 971                         case "ur": id = 1056; break;
 972                         case "uz": id = 1091; break;
 973                         case "uz-cyrl": id = 2115; break;
 974                         case "uz-latn": id = 1091; break;
 975                         case "vi": id = 1066; break;
 976                         case "wo": id = 1160; break;
 977                         case "xh": id = 1076; break;
 978                         case "yo": id = 1130; break;
 979                         case "zh": id = 2052; break;
 980                         case "zh-chs":
 981                         case "zh-hans":
 982                                 id = 2052; break;
 983                         case "zh-cht":
 984                         case "zh-hant":
 985                                 id = 3076; break;
 986                         case "zu": id = 1077; break;
 987                         default:
 988                                 throw new NotImplementedException ("Mapping for neutral culture " + name);
 989                         }
 990
 991                         return new CultureInfo (id);
 992                 }
 993
 994                 static Calendar CreateCalendar (int calendarType)
 995                 {
 996                         string name = null;
 997                         switch (calendarType >> CalendarTypeBits) {
 998                         case 1:
 999                                 GregorianCalendarTypes greg_type;
1000                                 greg_type = (GregorianCalendarTypes) (calendarType & 0xFF);
1001                                 return new GregorianCalendar (greg_type);
1002                         case 2:
1003                                 name = "System.Globalization.ThaiBuddhistCalendar";
1004                                 break;
1005                         case 3:
1006                                 name = "System.Globalization.UmAlQuraCalendar";
1007                                 break;
1008                         case 4:
1009                                 name = "System.Globalization.HijriCalendar";
1010                                 break;
1011                         default:
1012                                 throw new NotImplementedException ("Unknown calendar type: " + calendarType);
1013                         }
1014
1015                         Type type = Type.GetType (name, false);
1016                         if (type == null)
1017                                 return CreateCalendar (1 << CalendarTypeBits); // return invariant calandar if not found
1018                         return (Calendar) Activator.CreateInstance (type);
1019                 }
1020
1021                 static Exception CreateNotFoundException (string name)
1022                 {
1023 #if NET_4_0
1024                         return new CultureNotFoundException ("name", "Culture name " + name + " is not supported.");
1025 #else
1026                         return new ArgumentException ("Culture name " + name + " is not supported.", "name");
1027 #endif
1028                 }
1029
1030 #if NET_4_5
1031                 public static CultureInfo DefaultThreadCurrentCulture {
1032                         get {
1033                                 return Thread.default_culture;
1034                         }
1035                         set {
1036                                 Thread.default_culture = value;
1037                         }
1038                 }
1039
1040                 public static CultureInfo DefaultThreadCurrentUICulture {
1041                         get {
1042                                 return Thread.default_ui_culture;
1043                         }
1044                         set {
1045                                 Thread.default_ui_culture = value;
1046                         }
1047                 }
1048 #endif
1049         }
1050 }