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                 internal volatile NumberFormatInfo numInfo;
  63                 internal volatile DateTimeFormatInfo dateTimeInfo;
  64                 volatile TextInfo textInfo;
  65                 internal 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                 [StructLayout (LayoutKind.Sequential)]
  87                 struct Data {
  88                         public int ansi;
  89                         public int ebcdic;
  90                         public int mac;
  91                         public int oem;
  92                         public bool right_to_left;
  93                         public byte list_sep;
  94                 }
  95
  96                 int m_dataItem;         // MS.NET serializes this.
  97 #pragma warning restore 169, 649
  98
  99                 Calendar calendar;
 100
 101                 [NonSerialized]
 102                 CultureInfo parent_culture;
 103
 104                 // Deserialized instances will set this to false
 105                 [NonSerialized]
 106                 bool constructed;
 107
 108                 [NonSerialized]
 109                 // Used by Thread.set_CurrentCulture
 110                 internal byte[] cached_serialized_form;
 111
 112                 [NonSerialized]internal CultureData m_cultureData;
 113                 [NonSerialized]internal bool m_isInherited;
 114
 115                 internal const int InvariantCultureId = 0x7F;
 116                 const int CalendarTypeBits = 8;
 117
 118                 const string MSG_READONLY = "This instance is read only";
 119
 120                 public static CultureInfo InvariantCulture {
 121                         get {
 122                                 return invariant_culture_info;
 123                         }
 124                 }
 125
 126                 public static CultureInfo CurrentCulture {
 127                         get {
 128                                 return Thread.CurrentThread.CurrentCulture;
 129                         }
 130                 }
 131
 132                 public static CultureInfo CurrentUICulture {
 133                         get {
 134                                 return Thread.CurrentThread.CurrentUICulture;
 135                         }
 136                 }
 137
 138                 internal static CultureInfo ConstructCurrentCulture ()
 139                 {
 140                         if (default_current_culture != null)
 141                                 return default_current_culture;
 142
 143                         var locale_name = get_current_locale_name ();
 144                         CultureInfo ci = null;
 145
 146                         if (locale_name != null) {
 147                                 try {
 148                                         ci = CreateSpecificCulture (locale_name);
 149                                 } catch {
 150                                 }
 151                         }
 152
 153                         if (ci == null) {
 154                                 ci = InvariantCulture;
 155                         } else {
 156                                 ci.m_isReadOnly = true;
 157                                 ci.m_useUserOverride = true;
 158                         }
 159
 160                         default_current_culture = ci;
 161                         return ci;
 162                 }
 163
 164                 internal static CultureInfo ConstructCurrentUICulture ()
 165                 {
 166                         return ConstructCurrentCulture ();
 167                 }
 168
 169                 // it is used for RegionInfo.
 170                 internal string Territory {
 171                         get { return territory; }
 172                 }
 173
 174 #if !NET_2_1
 175                 // FIXME: It is implemented, but would be hell slow.
 176                 [ComVisible (false)]
 177                 public CultureTypes CultureTypes {
 178                         get {
 179                                 CultureTypes ret = (CultureTypes) 0;
 180                                 foreach (CultureTypes v in Enum.GetValues (typeof (CultureTypes)))
 181                                         if (Array.IndexOf (GetCultures (v), this) >= 0)
 182                                                 ret |= v;
 183                                 return ret;
 184                         }
 185                 }
 186
 187                 [ComVisible (false)]
 188                 public CultureInfo GetConsoleFallbackUICulture ()
 189                 {
 190                         // as documented in MSDN ...
 191                         switch (Name) {
 192                         case "ar": case "ar-BH": case "ar-EG": case "ar-IQ":
 193                         case "ar-JO": case "ar-KW": case "ar-LB": case "ar-LY":
 194                         case "ar-QA": case "ar-SA": case "ar-SY": case "ar-AE":
 195                         case "ar-YE":
 196                         case "dv": case "dv-MV":
 197                         case "fa": case "fa-IR":
 198                         case "gu": case "gu-IN":
 199                         case "he": case "he-IL":
 200                         case "hi": case "hi-IN":
 201                         case "kn": case "kn-IN":
 202                         case "kok": case "kok-IN":
 203                         case "mr": case "mr-IN":
 204                         case "pa": case "pa-IN":
 205                         case "sa": case "sa-IN":
 206                         case "syr": case "syr-SY":
 207                         case "ta": case "ta-IN":
 208                         case "te": case "te-IN":
 209                         case "th": case "th-TH":
 210                         case "ur": case "ur-PK":
 211                         case "vi": case "vi-VN":
 212                                 return GetCultureInfo ("en");
 213                         case "ar-DZ": case "ar-MA": case "ar-TN":
 214                                 return GetCultureInfo ("fr");
 215                         }
 216                         return (CultureTypes & CultureTypes.WindowsOnlyCultures) != 0 ? CultureInfo.InvariantCulture : this;
 217                 }
 218
 219                 [ComVisible (false)]
 220                 public string IetfLanguageTag {
 221                         // There could be more consistent way to implement
 222                         // it, but right now it works just fine with this...
 223                         get {
 224                                 switch (Name) {
 225                                 case "zh-CHS":
 226                                         return "zh-Hans";
 227                                 case "zh-CHT":
 228                                         return "zh-Hant";
 229                                 default:
 230                                         return Name;
 231                                 }
 232                         }
 233                 }
 234
 235                 // For specific cultures it basically returns LCID.
 236                 // For neutral cultures it is mapped to the default(?) specific
 237                 // culture, where the LCID of the specific culture seems to be
 238                 // n + 1024 by default. zh-CHS is the only exception which is
 239                 // mapped to 2052, not 1028 (zh-CHT is mapped to 1028 instead).
 240                 // There are very few exceptions, here I simply list them here.
 241                 // It is Windows-specific property anyways, so no worthy of
 242                 // trying to do some complex things with locale-builder.
 243                 [ComVisible (false)]
 244                 public virtual int KeyboardLayoutId {
 245                         get {
 246                                 switch (LCID) {
 247                                 case 4: // zh-CHS (neutral)
 248                                         return 2052;
 249                                 case 1034: // es-ES Spanish 2
 250                                         return 3082;
 251                                 case 31748: // zh-CHT (neutral)
 252                                         return 1028;
 253                                 case 31770: // sr (neutral)
 254                                         return 2074;
 255                                 default:
 256                                         return LCID < 1024 ? LCID + 1024 : LCID;
 257                                 }
 258                         }
 259                 }
 260 #endif
 261
 262                 public virtual int LCID {
 263                         get {
 264                                 return cultureID;
 265                         }
 266                 }
 267
 268                 public virtual string Name {
 269                         get {
 270                                 return(m_name);
 271                         }
 272                 }
 273
 274                 public virtual string NativeName {
 275                         get {
 276                                 if (!constructed) Construct ();
 277                                 return nativename;
 278                         }
 279                 }
 280
 281                 internal string NativeCalendarName {
 282                         get {
 283                                 if (!constructed) Construct ();
 284                                 return native_calendar_names[(default_calendar_type >> CalendarTypeBits) - 1];
 285                         }
 286                 }
 287
 288                 public virtual Calendar Calendar {
 289                         get {
 290                                 if (calendar == null) {
 291                                         if (!constructed) Construct ();
 292                                         calendar = CreateCalendar (default_calendar_type);
 293                                 }
 294
 295                                 return calendar;
 296                         }
 297                 }
 298
 299                 [MonoLimitation ("Optional calendars are not supported only default calendar is returned")]
 300                 public virtual Calendar[] OptionalCalendars {
 301                         get {
 302                                 return new[] { Calendar };
 303                         }
 304                 }
 305
 306                 public virtual CultureInfo Parent
 307                 {
 308                         get {
 309                                 if (parent_culture == null) {
 310                                         if (!constructed)
 311                                                 Construct ();
 312                                         if (parent_lcid == cultureID) {
 313                                                 //
 314                                                 // Parent lcid is same but culture info is not for legacy zh culture
 315                                                 //
 316                                                 if (parent_lcid == 0x7C04 && EnglishName [EnglishName.Length - 1] == 'y')
 317                                                         return parent_culture = new CultureInfo ("zh-Hant");
 318                                                 else if (parent_lcid == 0x0004 && EnglishName [EnglishName.Length -1] == 'y')
 319                                                         return parent_culture = new CultureInfo ("zh-Hans");
 320                                                 return null;
 321                                         }
 322
 323                                         if (parent_lcid == InvariantCultureId)
 324                                                 parent_culture = InvariantCulture;
 325                                         else if (cultureID == InvariantCultureId)
 326                                                 parent_culture = this;
 327                                         else if (cultureID == 0x0404) {
 328                                                 // zh-tw has parent id 0x7C04 which is in this case zh-cht and not zh-hant
 329                                                 parent_culture = new CultureInfo ("zh-CHT");
 330                                         } else
 331                                                 parent_culture = new CultureInfo (parent_lcid);
 332                                 }
 333                                 return parent_culture;
 334                         }
 335                 }
 336
 337                 public virtual TextInfo TextInfo
 338                 {
 339                         get {
 340                                 if (textInfo == null) {
 341                                         if (!constructed) Construct ();
 342                                         lock (this) {
 343                                                 if(textInfo == null) {
 344                                                         textInfo = CreateTextInfo (m_isReadOnly);
 345                                                 }
 346                                         }
 347                                 }
 348
 349                                 return(textInfo);
 350                         }
 351                 }
 352
 353                 public virtual string ThreeLetterISOLanguageName {
 354                         get {
 355                                 if (!constructed) Construct ();
 356                                 return iso3lang;
 357                         }
 358                 }
 359
 360                 public virtual string ThreeLetterWindowsLanguageName
 361                 {
 362                         get {
 363                                 if (!constructed) Construct ();
 364                                 return(win3lang);
 365                         }
 366                 }
 367
 368                 public virtual string TwoLetterISOLanguageName {
 369                         get {
 370                                 if (!constructed) Construct ();
 371                                 return(iso2lang);
 372                         }
 373                 }
 374
 375                 public bool UseUserOverride
 376                 {
 377                         get {
 378                                 return m_useUserOverride;
 379                         }
 380                 }
 381
 382                 public void ClearCachedData()
 383                 {
 384                         lock (shared_table_lock) {
 385                                 shared_by_number = null;
 386                                 shared_by_name = null;
 387                         }
 388
 389                         //
 390                         // ClearCachedData method does not refresh the information in
 391                         // the Thread.CurrentCulture property for existing threads
 392                         //
 393                         default_current_culture = null;
 394
 395                         RegionInfo.ClearCachedData ();
 396                         TimeZone.ClearCachedData ();
 397                         TimeZoneInfo.ClearCachedData ();
 398                 }
 399
 400                 public virtual object Clone()
 401                 {
 402                         if (!constructed) Construct ();
 403                         CultureInfo ci=(CultureInfo)MemberwiseClone ();
 404                         ci.m_isReadOnly=false;
 405                         ci.cached_serialized_form=null;
 406                         if (!IsNeutralCulture) {
 407                                 ci.NumberFormat = (NumberFormatInfo)NumberFormat.Clone ();
 408                                 ci.DateTimeFormat = (DateTimeFormatInfo)DateTimeFormat.Clone ();
 409                         }
 410                         return(ci);
 411                 }
 412
 413                 public override bool Equals (object value)
 414                 {
 415                         CultureInfo b = value as CultureInfo;
 416                         return b != null && b.cultureID == cultureID && b.m_name == m_name;
 417                 }
 418
 419                 public static CultureInfo[] GetCultures(CultureTypes types)
 420                 {
 421                         bool neutral=((types & CultureTypes.NeutralCultures)!=0);
 422                         bool specific=((types & CultureTypes.SpecificCultures)!=0);
 423                         bool installed=((types & CultureTypes.InstalledWin32Cultures)!=0);  // TODO
 424
 425                         CultureInfo [] infos = internal_get_cultures (neutral, specific, installed);
 426                         // The runtime returns a NULL in the first position of the array when
 427                         // 'neutral' is true. We fill it in with a clone of InvariantCulture
 428                         // since it must not be read-only
 429                         int i = 0;
 430                         if (neutral && infos.Length > 0 && infos [0] == null) {
 431                                 infos [i++] = (CultureInfo) InvariantCulture.Clone ();
 432                         }
 433
 434                         for (; i < infos.Length; ++i) {
 435                                 var ci = infos [i];
 436                                 var ti = ci.GetTextInfoData ();
 437                                 infos [i].m_cultureData = CultureData.GetCultureData (ci.m_name, false, ci.datetime_index, ci.CalendarType, ci.number_index, ci.iso2lang,
 438                                         ti.ansi, ti.oem, ti.mac, ti.ebcdic, ti.right_to_left, ((char)ti.list_sep).ToString ());
 439                         }
 440
 441                         return infos;
 442                 }
 443
 444                 unsafe Data GetTextInfoData ()
 445                 {
 446                         return *(Data*) textinfo_data;
 447                 }
 448
 449                 public override int GetHashCode ()
 450                 {
 451                         return cultureID.GetHashCode ();
 452                 }
 453
 454                 public static CultureInfo ReadOnly(CultureInfo ci)
 455                 {
 456                         if(ci==null) {
 457                                 throw new ArgumentNullException("ci");
 458                         }
 459
 460                         if(ci.m_isReadOnly) {
 461                                 return(ci);
 462                         } else {
 463                                 CultureInfo new_ci=(CultureInfo)ci.Clone ();
 464                                 new_ci.m_isReadOnly=true;
 465                                 if (new_ci.numInfo != null)
 466                                         new_ci.numInfo = NumberFormatInfo.ReadOnly (new_ci.numInfo);
 467                                 if (new_ci.dateTimeInfo != null)
 468                                         new_ci.dateTimeInfo = DateTimeFormatInfo.ReadOnly (new_ci.dateTimeInfo);
 469                                 if (new_ci.textInfo != null)
 470                                         new_ci.textInfo = TextInfo.ReadOnly (new_ci.textInfo);
 471                                 return(new_ci);
 472                         }
 473                 }
 474
 475                 public override string ToString()
 476                 {
 477                         return(m_name);
 478                 }
 479
 480                 public virtual CompareInfo CompareInfo
 481                 {
 482                         get {
 483                                 if(compareInfo==null) {
 484                                         if (!constructed)
 485                                                 Construct ();
 486
 487                                         lock (this) {
 488                                                 if(compareInfo==null) {
 489                                                         compareInfo=new CompareInfo (this);
 490                                                 }
 491                                         }
 492                                 }
 493
 494                                 return(compareInfo);
 495                         }
 496                 }
 497
 498                 public virtual bool IsNeutralCulture {
 499                         get {
 500                                 if (cultureID == InvariantCultureId)
 501                                         return false;
 502
 503                                 if (!constructed) Construct ();
 504                                 return territory == null;
 505                         }
 506                 }
 507
 508                 internal void CheckNeutral ()
 509                 {
 510                 }
 511
 512                 public virtual NumberFormatInfo NumberFormat {
 513                         get {
 514                                 if (numInfo == null) {
 515                                         NumberFormatInfo temp = new NumberFormatInfo(this.m_cultureData);
 516                                         temp.isReadOnly = m_isReadOnly;
 517                                         numInfo = temp;
 518                                 }
 519
 520                                 return numInfo;
 521                         }
 522
 523                         set {
 524                                 if (!constructed) Construct ();
 525                                 if (m_isReadOnly) throw new InvalidOperationException(MSG_READONLY);
 526
 527                                 if (value == null)
 528                                         throw new ArgumentNullException ("NumberFormat");
 529
 530                                 numInfo = value;
 531                         }
 532                 }
 533
 534                 public virtual DateTimeFormatInfo DateTimeFormat {
 535                         get {
 536                                 if (dateTimeInfo != null)
 537                                         return dateTimeInfo;
 538
 539                                 if (!constructed) Construct ();
 540                                 CheckNeutral ();
 541
 542                                 var temp = new DateTimeFormatInfo (m_cultureData, Calendar);
 543                                 temp.m_isReadOnly = m_isReadOnly;
 544                                 System.Threading.Thread.MemoryBarrier();
 545                                 dateTimeInfo = temp;
 546                                 return dateTimeInfo;
 547                         }
 548
 549                         set {
 550                                 if (!constructed) Construct ();
 551                                 if (m_isReadOnly) throw new InvalidOperationException(MSG_READONLY);
 552
 553                                 if (value == null)
 554                                         throw new ArgumentNullException ("DateTimeFormat");
 555
 556                                 dateTimeInfo = value;
 557                         }
 558                 }
 559
 560                 public virtual string DisplayName {
 561                         get {
 562                                 // Mono is not localized and will always return english name regardless of OS locale
 563                                 return EnglishName;
 564                         }
 565                 }
 566
 567                 public virtual string EnglishName {
 568                         get {
 569                                 if (!constructed) Construct ();
 570                                 return englishname;
 571                         }
 572                 }
 573
 574                 public static CultureInfo InstalledUICulture {
 575                         get {
 576                                 return ConstructCurrentCulture ();
 577                         }
 578                 }
 579
 580                 public bool IsReadOnly {
 581                         get {
 582                                 return m_isReadOnly;
 583                         }
 584                 }
 585
 586
 587                 //
 588                 // IFormatProvider implementation
 589                 //
 590                 public virtual object GetFormat( Type formatType )
 591                 {
 592                         object format = null;
 593
 594                         if ( formatType == typeof(NumberFormatInfo) )
 595                                 format = NumberFormat;
 596                         else if ( formatType == typeof(DateTimeFormatInfo) )
 597                                 format = DateTimeFormat;
 598
 599                         return format;
 600                 }
 601
 602                 void Construct ()
 603                 {
 604                         construct_internal_locale_from_lcid (cultureID);
 605                         constructed = true;
 606                 }
 607
 608                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 609                 private extern bool construct_internal_locale_from_lcid (int lcid);
 610
 611                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 612                 private extern bool construct_internal_locale_from_name (string name);
 613
 614                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 615                 private extern static string get_current_locale_name ();
 616
 617                 [MethodImplAttribute (MethodImplOptions.InternalCall)]
 618                 private extern static CultureInfo [] internal_get_cultures (bool neutral, bool specific, bool installed);
 619
 620                 private void ConstructInvariant (bool read_only)
 621                 {
 622                         cultureID = InvariantCultureId;
 623
 624                         /* NumberFormatInfo defaults to the invariant data */
 625                         numInfo=NumberFormatInfo.InvariantInfo;
 626
 627                         if (!read_only) {
 628                                 numInfo = (NumberFormatInfo) numInfo.Clone ();
 629                         }
 630
 631                         textInfo = TextInfo.Invariant;
 632
 633                         m_name=String.Empty;
 634                         englishname=
 635                         nativename="Invariant Language (Invariant Country)";
 636                         iso3lang="IVL";
 637                         iso2lang="iv";
 638                         win3lang="IVL";
 639                         default_calendar_type = 1 << CalendarTypeBits | (int) GregorianCalendarTypes.Localized;
 640                 }
 641
 642                 private unsafe TextInfo CreateTextInfo (bool readOnly)
 643                 {
 644                         TextInfo tempTextInfo = new TextInfo (this.m_cultureData);
 645                         tempTextInfo.SetReadOnlyState (readOnly);
 646                         return tempTextInfo;
 647                 }
 648
 649                 public CultureInfo (int culture) : this (culture, true) {}
 650
 651                 public CultureInfo (int culture, bool useUserOverride) :
 652                         this (culture, useUserOverride, false) {}
 653
 654                 private CultureInfo (int culture, bool useUserOverride, bool read_only)
 655                 {
 656                         if (culture < 0)
 657                                 throw new ArgumentOutOfRangeException ("culture", "Positive "
 658                                         + "number required.");
 659
 660                         constructed = true;
 661                         m_isReadOnly = read_only;
 662                         m_useUserOverride = useUserOverride;
 663
 664                         if (culture == InvariantCultureId) {
 665                                 /* Short circuit the invariant culture */
 666                                 m_cultureData = CultureData.Invariant;
 667                                 ConstructInvariant (read_only);
 668                                 return;
 669                         }
 670
 671                         if (!construct_internal_locale_from_lcid (culture)) {
 672                                 //
 673                                 // Be careful not to cause recursive CultureInfo initialization
 674                                 //
 675                                 var msg = string.Format (InvariantCulture, "Culture ID {0} (0x{1}) is not a supported culture.", culture.ToString (InvariantCulture), culture.ToString ("X4", InvariantCulture));
 676                                 throw new CultureNotFoundException ("culture", msg);
 677                         }
 678
 679                         var ti = GetTextInfoData ();
 680                         m_cultureData = CultureData.GetCultureData (m_name, m_useUserOverride, datetime_index, CalendarType, number_index, iso2lang,
 681                                 ti.ansi, ti.oem, ti.mac, ti.ebcdic, ti.right_to_left, ((char)ti.list_sep).ToString ());
 682                 }
 683
 684                 public CultureInfo (string name) : this (name, true) {}
 685
 686                 public CultureInfo (string name, bool useUserOverride) :
 687                         this (name, useUserOverride, false) {}
 688
 689                 private CultureInfo (string name, bool useUserOverride, bool read_only)
 690                 {
 691                         if (name == null)
 692                                 throw new ArgumentNullException ("name");
 693
 694                         constructed = true;
 695                         m_isReadOnly = read_only;
 696                         m_useUserOverride = useUserOverride;
 697                         m_isInherited = GetType() != typeof(System.Globalization.CultureInfo);
 698
 699                         if (name.Length == 0) {
 700                                 /* Short circuit the invariant culture */
 701                                 m_cultureData = CultureData.Invariant;
 702                                 ConstructInvariant (read_only);
 703                                 return;
 704                         }
 705
 706                         if (!construct_internal_locale_from_name (name.ToLowerInvariant ())) {
 707                                 throw CreateNotFoundException (name);
 708                         }
 709
 710                         var ti = GetTextInfoData ();
 711                         m_cultureData = CultureData.GetCultureData (m_name, useUserOverride, datetime_index, CalendarType, number_index, iso2lang,
 712                                 ti.ansi, ti.oem, ti.mac, ti.ebcdic, ti.right_to_left, ((char)ti.list_sep).ToString ());
 713                 }
 714
 715                 // This is used when creating by specific name and creating by
 716                 // current locale so we can initialize the object without
 717                 // doing any member initialization
 718                 private CultureInfo () { constructed = true; }
 719                 static Dictionary<int, CultureInfo> shared_by_number;
 720                 static Dictionary<string, CultureInfo> shared_by_name;
 721
 722                 static void insert_into_shared_tables (CultureInfo c)
 723                 {
 724                         if (shared_by_number == null){
 725                                 shared_by_number = new Dictionary<int, CultureInfo> ();
 726                                 shared_by_name = new Dictionary<string, CultureInfo> ();
 727                         }
 728                         shared_by_number [c.cultureID] = c;
 729                         shared_by_name [c.m_name] = c;
 730                 }
 731
 732                 public static CultureInfo GetCultureInfo (int culture)
 733                 {
 734                         if (culture < 1)
 735                                 throw new ArgumentOutOfRangeException ("culture", "Positive number required.");
 736
 737                         CultureInfo c;
 738
 739                         lock (shared_table_lock){
 740                                 if (shared_by_number != null) {
 741                                         if (shared_by_number.TryGetValue (culture, out c))
 742                                                 return c;
 743                                 }
 744
 745                                 c = new CultureInfo (culture, false, true);
 746                                 insert_into_shared_tables (c);
 747                                 return c;
 748                         }
 749                 }
 750
 751                 public static CultureInfo GetCultureInfo (string name)
 752                 {
 753                         if (name == null)
 754                                 throw new ArgumentNullException ("name");
 755
 756                         CultureInfo c;
 757                         lock (shared_table_lock){
 758                                 if (shared_by_name != null){
 759                                         if (shared_by_name.TryGetValue (name, out c))
 760                                                 return c;
 761                                 }
 762                                 c = new CultureInfo (name, false, true);
 763                                 insert_into_shared_tables (c);
 764                                 return c;
 765                         }
 766                 }
 767
 768                 [MonoTODO ("Currently it ignores the altName parameter")]
 769                 public static CultureInfo GetCultureInfo (string name, string altName) {
 770                         if (name == null)
 771                                 throw new ArgumentNullException ("null");
 772                         if (altName == null)
 773                                 throw new ArgumentNullException ("null");
 774
 775                         return GetCultureInfo (name);
 776                 }
 777
 778                 public static CultureInfo GetCultureInfoByIetfLanguageTag (string name)
 779                 {
 780                         // There could be more consistent way to implement
 781                         // it, but right now it works just fine with this...
 782                         switch (name) {
 783                         case "zh-Hans":
 784                                 return GetCultureInfo ("zh-CHS");
 785                         case "zh-Hant":
 786                                 return GetCultureInfo ("zh-CHT");
 787                         default:
 788                                 return GetCultureInfo (name);
 789                         }
 790                 }
 791
 792                 // used in runtime (icall.c) to construct CultureInfo for
 793                 // AssemblyName of assemblies
 794                 internal static CultureInfo CreateCulture (string name, bool reference)
 795                 {
 796                         bool read_only;
 797                         bool use_user_override;
 798
 799                         bool invariant = name.Length == 0;
 800                         if (reference) {
 801                                 use_user_override = invariant ? false : true;
 802                                 read_only = false;
 803                         } else {
 804                                 read_only = false;
 805                                 use_user_override = invariant ? false : true;
 806                         }
 807
 808                         return new CultureInfo (name, use_user_override, read_only);
 809                 }
 810
 811                 public static CultureInfo CreateSpecificCulture (string name)
 812                 {
 813                         if (name == null)
 814                                 throw new ArgumentNullException ("name");
 815
 816                         if (name.Length == 0)
 817                                 return InvariantCulture;
 818
 819                         var src_name = name;
 820                         name = name.ToLowerInvariant ();
 821                         CultureInfo ci = new CultureInfo ();
 822
 823                         if (!ci.construct_internal_locale_from_name (name)) {
 824                                 int idx = name.Length - 1;
 825                                 if (idx > 0) {
 826                                         while ((idx = name.LastIndexOf ('-', idx - 1)) > 0) {
 827                                                 if (ci.construct_internal_locale_from_name (name.Substring (0, idx)))
 828                                                         break;
 829                                         }
 830                                 }
 831
 832                                 if (idx <= 0)
 833                                         throw CreateNotFoundException (src_name);
 834                         }
 835
 836                         if (ci.IsNeutralCulture)
 837                                 ci = CreateSpecificCultureFromNeutral (ci.Name);
 838
 839                         var ti = ci.GetTextInfoData ();
 840
 841                         ci.m_cultureData = CultureData.GetCultureData (ci.m_name, false, ci.datetime_index, ci.CalendarType, ci.number_index, ci.iso2lang,
 842                                 ti.ansi, ti.oem, ti.mac, ti.ebcdic, ti.right_to_left, ((char)ti.list_sep).ToString ());
 843                         return ci;
 844                 }
 845
 846                 //
 847                 // Creates specific culture from neutral culture. Used by CreateSpecificCulture
 848                 // only but using separate method we can delay switch underlying Dictionary
 849                 // initialization
 850                 //
 851                 static CultureInfo CreateSpecificCultureFromNeutral (string name)
 852                 {
 853                         int id;
 854
 855                         //
 856                         // For neutral cultures find predefined default specific culture
 857                         //
 858                         // Use managed switch because we need this for only some cultures
 859                         // and the method is not used frequently
 860                         //
 861                         // TODO: We could optimize for cultures with single specific culture
 862                         //
 863                         switch (name.ToLowerInvariant ()) {
 864                         case "af": id = 1078; break;
 865                         case "am": id = 1118; break;
 866                         case "ar": id = 1025; break;
 867                         case "arn": id = 1146; break;
 868                         case "as": id = 1101; break;
 869                         case "az": id = 1068; break;
 870                         case "az-cyrl": id = 2092; break;
 871                         case "az-latn": id = 1068; break;
 872                         case "ba": id = 1133; break;
 873                         case "be": id = 1059; break;
 874                         case "bg": id = 1026; break;
 875                         case "bn": id = 1093; break;
 876                         case "bo": id = 1105; break;
 877                         case "br": id = 1150; break;
 878                         case "bs": id = 5146; break;
 879                         case "bs-cyrl": id = 8218; break;
 880                         case "bs-latn": id = 5146; break;
 881                         case "ca": id = 1027; break;
 882                         case "co": id = 1155; break;
 883                         case "cs": id = 1029; break;
 884                         case "cy": id = 1106; break;
 885                         case "da": id = 1030; break;
 886                         case "de": id = 1031; break;
 887                         case "dsb": id = 2094; break;
 888                         case "dv": id = 1125; break;
 889                         case "el": id = 1032; break;
 890                         case "en": id = 1033; break;
 891                         case "es": id = 3082; break;
 892                         case "et": id = 1061; break;
 893                         case "eu": id = 1069; break;
 894                         case "fa": id = 1065; break;
 895                         case "fi": id = 1035; break;
 896                         case "fil": id = 1124; break;
 897                         case "fo": id = 1080; break;
 898                         case "fr": id = 1036; break;
 899                         case "fy": id = 1122; break;
 900                         case "ga": id = 2108; break;
 901                         case "gd": id = 1169; break;
 902                         case "gl": id = 1110; break;
 903                         case "gsw": id = 1156; break;
 904                         case "gu": id = 1095; break;
 905                         case "ha": id = 1128; break;
 906                         case "ha-latn": id = 1128; break;
 907                         case "he": id = 1037; break;
 908                         case "hi": id = 1081; break;
 909                         case "hr": id = 1050; break;
 910                         case "hsb": id = 1070; break;
 911                         case "hu": id = 1038; break;
 912                         case "hy": id = 1067; break;
 913                         case "id": id = 1057; break;
 914                         case "ig": id = 1136; break;
 915                         case "ii": id = 1144; break;
 916                         case "is": id = 1039; break;
 917                         case "it": id = 1040; break;
 918                         case "iu": id = 2141; break;
 919                         case "iu-cans": id = 1117; break;
 920                         case "iu-latn": id = 2141; break;
 921                         case "ja": id = 1041; break;
 922                         case "ka": id = 1079; break;
 923                         case "kk": id = 1087; break;
 924                         case "kl": id = 1135; break;
 925                         case "km": id = 1107; break;
 926                         case "kn": id = 1099; break;
 927                         case "ko": id = 1042; break;
 928                         case "kok": id = 1111; break;
 929                         case "ky": id = 1088; break;
 930                         case "lb": id = 1134; break;
 931                         case "lo": id = 1108; break;
 932                         case "lt": id = 1063; break;
 933                         case "lv": id = 1062; break;
 934                         case "mi": id = 1153; break;
 935                         case "mk": id = 1071; break;
 936                         case "ml": id = 1100; break;
 937                         case "mn": id = 1104; break;
 938                         case "mn-cyrl": id = 1104; break;
 939                         case "mn-mong": id = 2128; break;
 940                         case "moh": id = 1148; break;
 941                         case "mr": id = 1102; break;
 942                         case "ms": id = 1086; break;
 943                         case "mt": id = 1082; break;
 944                         case "nb": id = 1044; break;
 945                         case "ne": id = 1121; break;
 946                         case "nl": id = 1043; break;
 947                         case "nn": id = 2068; break;
 948                         case "no": id = 1044; break;
 949                         case "nso": id = 1132; break;
 950                         case "oc": id = 1154; break;
 951                         case "or": id = 1096; break;
 952                         case "pa": id = 1094; break;
 953                         case "pl": id = 1045; break;
 954                         case "prs": id = 1164; break;
 955                         case "ps": id = 1123; break;
 956                         case "pt": id = 1046; break;
 957                         case "qut": id = 1158; break;
 958                         case "quz": id = 1131; break;
 959                         case "rm": id = 1047; break;
 960                         case "ro": id = 1048; break;
 961                         case "ru": id = 1049; break;
 962                         case "rw": id = 1159; break;
 963                         case "sa": id = 1103; break;
 964                         case "sah": id = 1157; break;
 965                         case "se": id = 1083; break;
 966                         case "si": id = 1115; break;
 967                         case "sk": id = 1051; break;
 968                         case "sl": id = 1060; break;
 969                         case "sma": id = 7227; break;
 970                         case "smj": id = 5179; break;
 971                         case "smn": id = 9275; break;
 972                         case "sms": id = 8251; break;
 973                         case "sq": id = 1052; break;
 974                         case "sr": id = 9242; break;
 975                         case "sr-cyrl": id = 10266; break;
 976                         case "sr-latn": id = 9242; break;
 977                         case "sv": id = 1053; break;
 978                         case "sw": id = 1089; break;
 979                         case "syr": id = 1114; break;
 980                         case "ta": id = 1097; break;
 981                         case "te": id = 1098; break;
 982                         case "tg": id = 1064; break;
 983                         case "tg-cyrl": id = 1064; break;
 984                         case "th": id = 1054; break;
 985                         case "tk": id = 1090; break;
 986                         case "tn": id = 1074; break;
 987                         case "tr": id = 1055; break;
 988                         case "tt": id = 1092; break;
 989                         case "tzm": id = 2143; break;
 990                         case "tzm-latn": id = 2143; break;
 991                         case "ug": id = 1152; break;
 992                         case "uk": id = 1058; break;
 993                         case "ur": id = 1056; break;
 994                         case "uz": id = 1091; break;
 995                         case "uz-cyrl": id = 2115; break;
 996                         case "uz-latn": id = 1091; break;
 997                         case "vi": id = 1066; break;
 998                         case "wo": id = 1160; break;
 999                         case "xh": id = 1076; break;
1000                         case "yo": id = 1130; break;
1001                         case "zh": id = 2052; break;
1002                         case "zh-chs":
1003                         case "zh-hans":
1004                                 id = 2052; break;
1005                         case "zh-cht":
1006                         case "zh-hant":
1007                                 id = 3076; break;
1008                         case "zu": id = 1077; break;
1009                         default:
1010                                 throw new NotImplementedException ("Mapping for neutral culture " + name);
1011                         }
1012
1013                         return new CultureInfo (id);
1014                 }
1015
1016                 internal int CalendarType {
1017                         get {
1018                                 switch (default_calendar_type >> CalendarTypeBits) {
1019                                 case 1:
1020                                         return Calendar.CAL_GREGORIAN;
1021                                 case 2:
1022                                         return Calendar.CAL_THAI;
1023                                 case 3:
1024                                         return Calendar.CAL_UMALQURA;
1025                                 case 4:
1026                                         return Calendar.CAL_HIJRI;
1027                                 default:
1028                                         throw new NotImplementedException ("CalendarType");
1029                                 }
1030                         }
1031                 }
1032
1033                 static Calendar CreateCalendar (int calendarType)
1034                 {
1035                         string name = null;
1036                         switch (calendarType >> CalendarTypeBits) {
1037                         case 1:
1038                                 GregorianCalendarTypes greg_type;
1039                                 greg_type = (GregorianCalendarTypes) (calendarType & 0xFF);
1040                                 return new GregorianCalendar (greg_type);
1041                         case 2:
1042                                 name = "System.Globalization.ThaiBuddhistCalendar";
1043                                 break;
1044                         case 3:
1045                                 name = "System.Globalization.UmAlQuraCalendar";
1046                                 break;
1047                         case 4:
1048                                 name = "System.Globalization.HijriCalendar";
1049                                 break;
1050                         default:
1051                                 throw new NotImplementedException ("Unknown calendar type: " + calendarType);
1052                         }
1053
1054                         Type type = Type.GetType (name, false);
1055                         if (type == null)
1056                                 return new GregorianCalendar (GregorianCalendarTypes.Localized); // return invariant calendar if not found
1057                         return (Calendar) Activator.CreateInstance (type);
1058                 }
1059
1060                 static Exception CreateNotFoundException (string name)
1061                 {
1062                         return new CultureNotFoundException ("name", "Culture name " + name + " is not supported.");
1063                 }
1064
1065                 public static CultureInfo DefaultThreadCurrentCulture {
1066                         get {
1067                                 return Thread.default_culture;
1068                         }
1069                         set {
1070                                 Thread.default_culture = value;
1071                         }
1072                 }
1073
1074                 public static CultureInfo DefaultThreadCurrentUICulture {
1075                         get {
1076                                 return Thread.default_ui_culture;
1077                         }
1078                         set {
1079                                 Thread.default_ui_culture = value;
1080                         }
1081                 }
1082
1083                 internal string SortName {
1084                         get {
1085                                 return m_name;
1086                         }
1087                 }
1088
1089 #region reference sources
1090                 // TODO:
1091                 internal static readonly bool IsTaiwanSku;
1092
1093         //
1094         // CheckDomainSafetyObject throw if the object is customized object which cannot be attached to
1095         // other object (like CultureInfo or DateTimeFormatInfo).
1096         //
1097
1098         internal static void CheckDomainSafetyObject(Object obj, Object container)
1099         {
1100             if (obj.GetType().Assembly != typeof(System.Globalization.CultureInfo).Assembly) {
1101
1102                 throw new InvalidOperationException(
1103                             String.Format(
1104                                 CultureInfo.CurrentCulture,
1105                                 Environment.GetResourceString("InvalidOperation_SubclassedObject"),
1106                                 obj.GetType(),
1107                                 container.GetType()));
1108             }
1109             Contract.EndContractBlock();
1110         }
1111
1112         // For resource lookup, we consider a culture the invariant culture by name equality.
1113         // We perform this check frequently during resource lookup, so adding a property for
1114         // improved readability.
1115         internal bool HasInvariantCultureName
1116         {
1117             get { return Name == CultureInfo.InvariantCulture.Name; }
1118         }
1119
1120         internal static bool VerifyCultureName(String cultureName, bool throwException)
1121         {
1122             // This function is used by ResourceManager.GetResourceFileName().
1123             // ResourceManager searches for resource using CultureInfo.Name,
1124             // so we should check against CultureInfo.Name.
1125
1126             for (int i=0; i<cultureName.Length; i++) {
1127                 char c = cultureName[i];
1128                 //
1129
1130                 if (Char.IsLetterOrDigit(c) || c=='-' || c=='_') {
1131                     continue;
1132                 }
1133                 if (throwException) {
1134                     throw new ArgumentException(Environment.GetResourceString("Argument_InvalidResourceCultureName", cultureName));
1135                 }
1136                 return false;
1137             }
1138             return true;
1139         }
1140
1141 #endregion
1142         }
1143 }