class/corlib/System.Resources/ResourceManager.cs

   1 //
   2 // System.Resources.ResourceManager.cs
   3 //
   4 // Authors:
   5 //      Duncan Mak (duncan@ximian.com)
   6 //      Dick Porter (dick@ximian.com)
   7 //      Alexander Olk (alex.olk@googlemail.com)
   8 //
   9 // (C) 2001, 2002 Ximian, Inc. http://www.ximian.com
  10 //
  11
  12 //
  13 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  14 //
  15 // Permission is hereby granted, free of charge, to any person obtaining
  16 // a copy of this software and associated documentation files (the
  17 // "Software"), to deal in the Software without restriction, including
  18 // without limitation the rights to use, copy, modify, merge, publish,
  19 // distribute, sublicense, and/or sell copies of the Software, and to
  20 // permit persons to whom the Software is furnished to do so, subject to
  21 // the following conditions:
  22 //
  23 // The above copyright notice and this permission notice shall be
  24 // included in all copies or substantial portions of the Software.
  25 //
  26 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  30 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  31 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  32 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  33 //
  34
  35 using System.Collections;
  36 using System.Reflection;
  37 using System.Globalization;
  38 using System.Runtime.InteropServices;
  39 using System.IO;
  40
  41 namespace System.Resources
  42 {
  43         [Serializable]
  44         [ComVisible (true)]
  45         public class ResourceManager
  46         {
  47                 static Hashtable ResourceCache = new Hashtable ();
  48                 static Hashtable NonExistent = Hashtable.Synchronized (new Hashtable ());
  49                 public static readonly int HeaderVersionNumber = 1;
  50                 public static readonly int MagicNumber = unchecked ((int) 0xBEEFCACE);
  51
  52                 protected string BaseNameField;
  53                 protected Assembly MainAssembly;
  54                 // Maps cultures to ResourceSet objects
  55                 protected Hashtable ResourceSets;
  56
  57                 private bool ignoreCase;
  58                 private Type resourceSource;
  59                 private Type resourceSetType = typeof (RuntimeResourceSet);
  60                 private String resourceDir;
  61
  62                 // Contains cultures which have no resource sets
  63
  64                 /* Recursing through culture parents stops here */
  65                 private CultureInfo neutral_culture;
  66
  67                 private UltimateResourceFallbackLocation fallbackLocation;
  68
  69                 static Hashtable GetResourceSets (Assembly assembly, string basename)
  70                 {
  71                         lock (ResourceCache) {
  72                                 string key = String.Empty;
  73                                 if (assembly != null) {
  74                                         key = assembly.FullName;
  75                                 } else {
  76                                         key = basename.GetHashCode ().ToString () + "@@";
  77                                 }
  78                                 if (basename != null && basename != String.Empty) {
  79                                         key += "!" + basename;
  80                                 } else {
  81                                         key += "!" + key.GetHashCode ();
  82                                 }
  83                                 Hashtable tbl = ResourceCache [key] as Hashtable;
  84                                 if (tbl == null) {
  85                                         tbl = Hashtable.Synchronized (new Hashtable ());
  86                                         ResourceCache [key] = tbl;
  87                                 }
  88                                 return tbl;
  89                         }
  90                 }
  91
  92                 // constructors
  93                 protected ResourceManager ()
  94                 {
  95                 }
  96
  97                 public ResourceManager (Type resourceSource)
  98                 {
  99                         if (resourceSource == null)
 100                                 throw new ArgumentNullException ("resourceSource");
 101
 102                         this.resourceSource = resourceSource;
 103                         BaseNameField = resourceSource.Name;
 104                         MainAssembly = resourceSource.Assembly;
 105                         ResourceSets = GetResourceSets (MainAssembly, BaseNameField);
 106                         neutral_culture = GetNeutralResourcesLanguage (MainAssembly);
 107                 }
 108
 109                 public ResourceManager (string baseName, Assembly assembly)
 110                 {
 111                         if (baseName == null)
 112                                 throw new ArgumentNullException ("baseName");
 113                         if (assembly == null)
 114                                 throw new ArgumentNullException ("assembly");
 115
 116                         BaseNameField = baseName;
 117                         MainAssembly = assembly;
 118                         ResourceSets = GetResourceSets (MainAssembly, BaseNameField);
 119                         neutral_culture = GetNeutralResourcesLanguage (MainAssembly);
 120                 }
 121
 122                 private Type CheckResourceSetType (Type usingResourceSet, bool verifyType)
 123                 {
 124                         if (usingResourceSet == null)
 125                                 return resourceSetType;
 126
 127                         if (verifyType && !typeof (ResourceSet).IsAssignableFrom (usingResourceSet))
 128                                 throw new ArgumentException ("Type parameter"
 129                                         + " must refer to a subclass of"
 130                                         + " ResourceSet.", "usingResourceSet");
 131                         return usingResourceSet;
 132                 }
 133
 134                 public ResourceManager (string baseName, Assembly assembly, Type usingResourceSet)
 135                 {
 136                         if (baseName == null)
 137                                 throw new ArgumentNullException ("baseName");
 138                         if (assembly == null)
 139                                 throw new ArgumentNullException ("assembly");
 140
 141                         BaseNameField = baseName;
 142                         MainAssembly = assembly;
 143                         ResourceSets = GetResourceSets (MainAssembly, BaseNameField);
 144                         resourceSetType = CheckResourceSetType (usingResourceSet, true);
 145                         neutral_culture = GetNeutralResourcesLanguage (MainAssembly);
 146                 }
 147
 148                 /* Private constructor for CreateFileBasedResourceManager */
 149                 private ResourceManager(String baseName, String resourceDir, Type usingResourceSet)
 150                 {
 151                         if (baseName == null)
 152                                 throw new ArgumentNullException ("baseName");
 153                         if (resourceDir == null)
 154                                 throw new ArgumentNullException("resourceDir");
 155
 156                         BaseNameField = baseName;
 157                         this.resourceDir = resourceDir;
 158                         resourceSetType = CheckResourceSetType (usingResourceSet, false);
 159                         ResourceSets = GetResourceSets (MainAssembly, BaseNameField);
 160                 }
 161
 162                 public static ResourceManager CreateFileBasedResourceManager (string baseName,
 163                                                       string resourceDir, Type usingResourceSet)
 164                 {
 165                         return new ResourceManager (baseName, resourceDir, usingResourceSet);
 166                 }
 167
 168                 public virtual string BaseName {
 169                         get { return BaseNameField; }
 170                 }
 171
 172                 public virtual bool IgnoreCase {
 173                         get { return ignoreCase; }
 174                         set { ignoreCase = value; }
 175                 }
 176
 177                 public virtual Type ResourceSetType {
 178                         get { return resourceSetType; }
 179                 }
 180
 181                 public virtual object GetObject (string name)
 182                 {
 183                         return GetObject (name, null);
 184                 }
 185
 186                 public virtual object GetObject (string name, CultureInfo culture)
 187                 {
 188                         if (name == null)
 189                                 throw new ArgumentNullException("name");
 190
 191                         if (culture == null)
 192                                 culture = CultureInfo.CurrentUICulture;
 193
 194                         lock (this) {
 195                                 ResourceSet set = InternalGetResourceSet(culture, true, true);
 196                                 object obj = null;
 197
 198                                 if (set != null) {
 199                                         obj = set.GetObject(name, ignoreCase);
 200                                         if (obj != null)
 201                                                 return obj;
 202                                 }
 203
 204                                 /* Try parent cultures */
 205
 206                                 do {
 207                                         culture = culture.Parent;
 208
 209                                         set = InternalGetResourceSet (culture, true, true);
 210                                         if (set != null) {
 211                                                 obj = set.GetObject (name, ignoreCase);
 212                                                 if (obj != null)
 213                                                         return obj;
 214                                         }
 215                                 } while (!culture.Equals (neutral_culture) &&
 216                                         !culture.Equals (CultureInfo.InvariantCulture));
 217                         }
 218
 219                         return null;
 220                 }
 221
 222                 public virtual ResourceSet GetResourceSet (CultureInfo culture,
 223                                            bool createIfNotExists, bool tryParents)
 224
 225                 {
 226                         if (culture == null)
 227                                 throw new ArgumentNullException ("culture");
 228
 229                         lock (this) {
 230                                 return InternalGetResourceSet (culture, createIfNotExists, tryParents);
 231                         }
 232                 }
 233
 234                 public virtual string GetString (string name)
 235                 {
 236                         return GetString (name, null);
 237                 }
 238
 239                 public virtual string GetString (string name, CultureInfo culture)
 240                 {
 241                         if (name == null)
 242                                 throw new ArgumentNullException ("name");
 243
 244                         if (culture == null)
 245                                 culture = CultureInfo.CurrentUICulture;
 246
 247                         lock (this) {
 248                                 ResourceSet set = InternalGetResourceSet (culture, true, true);
 249                                 string str = null;
 250
 251                                 if (set != null) {
 252                                         str = set.GetString (name, ignoreCase);
 253                                         if (str != null)
 254                                                 return str;
 255                                 }
 256
 257                                 /* Try parent cultures */
 258
 259                                 do {
 260                                         culture = culture.Parent;
 261                                         set = InternalGetResourceSet (culture, true, true);
 262                                         if (set != null) {
 263                                                 str = set.GetString(name, ignoreCase);
 264                                                 if (str != null)
 265                                                         return str;
 266                                         }
 267                                 } while (!culture.Equals (neutral_culture) &&
 268                                         !culture.Equals (CultureInfo.InvariantCulture));
 269                         }
 270
 271                         return null;
 272                 }
 273
 274                 protected virtual string GetResourceFileName (CultureInfo culture)
 275                 {
 276                         if (culture.Equals (CultureInfo.InvariantCulture))
 277                                 return BaseNameField + ".resources";
 278                         else
 279                                 return BaseNameField + "." +  culture.Name + ".resources";
 280                 }
 281
 282                 private string GetResourceFilePath (CultureInfo culture)
 283                 {
 284 #if !MOONLIGHT
 285                         if (resourceDir != null)
 286                                 return Path.Combine (resourceDir, GetResourceFileName (culture));
 287                         else
 288 #endif
 289                                 return GetResourceFileName (culture);
 290                 }
 291
 292                 Stream GetManifestResourceStreamNoCase (Assembly ass, string fn)
 293                 {
 294                         string resourceName = GetManifestResourceName (fn);
 295
 296                         foreach (string s in ass.GetManifestResourceNames ())
 297                                 if (String.Compare (resourceName, s, true, CultureInfo.InvariantCulture) == 0)
 298                                         return ass.GetManifestResourceStream (s);
 299                         return null;
 300                 }
 301
 302                 [CLSCompliant (false)]
 303                 [ComVisible (false)]
 304                 public UnmanagedMemoryStream GetStream (string name)
 305                 {
 306                         return GetStream (name, (CultureInfo) null);
 307                 }
 308
 309                 [CLSCompliant (false)]
 310                 [ComVisible (false)]
 311                 public UnmanagedMemoryStream GetStream (string name, CultureInfo culture)
 312                 {
 313                         if (name == null)
 314                                 throw new ArgumentNullException ("name");
 315                         if (culture == null)
 316                                 culture = CultureInfo.CurrentUICulture;
 317                         ResourceSet set = InternalGetResourceSet (culture, true, true);
 318                         return set.GetStream (name, ignoreCase);
 319                 }
 320
 321                 protected virtual ResourceSet InternalGetResourceSet (CultureInfo culture, bool createIfNotExists, bool tryParents)
 322                 {
 323                         if (culture == null)
 324                                 throw new ArgumentNullException ("key"); // 'key' instead of 'culture' to make a test pass
 325
 326                         ResourceSet set;
 327
 328                         /* if we already have this resource set, return it */
 329                         set = (ResourceSet) ResourceSets [culture];
 330                         if (set != null)
 331                                 return set;
 332
 333                         if (NonExistent.Contains (culture))
 334                                 return null;
 335
 336                         if (MainAssembly != null) {
 337                                 /* Assembly resources */
 338                                 CultureInfo resourceCulture = culture;
 339
 340                                 // when the specified culture matches the neutral culture,
 341                                 // then use the invariant resources
 342                                 if (culture.Equals (neutral_culture))
 343                                         resourceCulture = CultureInfo.InvariantCulture;
 344
 345                                 Stream stream = null;
 346
 347                                 string filename = GetResourceFileName (resourceCulture);
 348                                 if (!resourceCulture.Equals (CultureInfo.InvariantCulture)) {
 349                                         /* Try a satellite assembly */
 350                                         Version sat_version = GetSatelliteContractVersion (MainAssembly);
 351                                         try {
 352                                                 Assembly a = MainAssembly.GetSatelliteAssemblyNoThrow (
 353                                                         resourceCulture, sat_version);
 354                                                 if (a != null){
 355                                                         stream = a.GetManifestResourceStream (filename);
 356                                                         if (stream == null)
 357                                                                 stream = GetManifestResourceStreamNoCase (a, filename);
 358                                                 }
 359                                         } catch (Exception) {
 360                                                 // Ignored
 361                                         }
 362                                 } else {
 363                                         stream = MainAssembly.GetManifestResourceStream (
 364                                                 resourceSource, filename);
 365                                         if (stream == null)
 366                                                 stream = GetManifestResourceStreamNoCase (
 367                                                         MainAssembly, filename);
 368                                 }
 369
 370                                 if (stream != null && createIfNotExists) {
 371                                         object [] args = new Object [1] { stream };
 372
 373                                         /* should we catch
 374                                          * MissingMethodException, or
 375                                          * just let someone else deal
 376                                          * with it?
 377                                          */
 378                                         set = (ResourceSet) Activator.CreateInstance (resourceSetType, args);
 379                                 } else if (resourceCulture.Equals (CultureInfo.InvariantCulture)) {
 380                                         throw AssemblyResourceMissing (filename);
 381                                 }
 382                         } else if (resourceDir != null || BaseNameField != null) {
 383                                 /* File resources */
 384                                 string filename = GetResourceFilePath (culture);
 385                                 if (createIfNotExists && File.Exists (filename)) {
 386                                         object [] args = new Object [1] { filename };
 387
 388                                         /* should we catch
 389                                          * MissingMethodException, or
 390                                          * just let someone else deal
 391                                          * with it?
 392                                          */
 393                                         set = (ResourceSet) Activator.CreateInstance(
 394                                                 resourceSetType, args);
 395                                 } else if (culture.Equals (CultureInfo.InvariantCulture)) {
 396                                         string msg = string.Format ("Could not find any " +
 397                                                 "resources appropriate for the specified culture " +
 398                                                 "(or the neutral culture) on disk.{0}" +
 399                                                 "baseName: {1}  locationInfo: {2}  fileName: {3}",
 400                                                 Environment.NewLine, BaseNameField, "<null>",
 401                                                 GetResourceFileName (culture));
 402                                         throw new MissingManifestResourceException (msg);
 403                                 }
 404                         }
 405
 406                         if (set == null && tryParents) {
 407                                 // avoid endless recursion
 408                                 if (!culture.Equals (CultureInfo.InvariantCulture))
 409                                         set = InternalGetResourceSet (culture.Parent,
 410                                                 createIfNotExists, tryParents);
 411                         }
 412
 413                         if (set != null)
 414                                 ResourceSets [culture] = set;
 415                         else
 416                                 NonExistent [culture] = culture;
 417
 418                         return set;
 419                 }
 420
 421                 public virtual void ReleaseAllResources ()
 422                 {
 423                         lock(this) {
 424                                 foreach (ResourceSet r in ResourceSets.Values)
 425                                         r.Close();
 426                                 ResourceSets.Clear();
 427                         }
 428                 }
 429
 430                 protected static CultureInfo GetNeutralResourcesLanguage (Assembly a)
 431                 {
 432                         object [] attrs = a.GetCustomAttributes (
 433                                 typeof (NeutralResourcesLanguageAttribute),
 434                                 false);
 435
 436                         if (attrs.Length == 0) {
 437                                 return CultureInfo.InvariantCulture;
 438                         } else {
 439                                 NeutralResourcesLanguageAttribute res_attr = (NeutralResourcesLanguageAttribute) attrs [0];
 440                                 return new CultureInfo (res_attr.CultureName);
 441                         }
 442                 }
 443
 444                 protected static Version GetSatelliteContractVersion (Assembly a)
 445                 {
 446                         object [] attrs = a.GetCustomAttributes (
 447                                 typeof (SatelliteContractVersionAttribute),
 448                                 false);
 449                         if (attrs.Length == 0) {
 450                                 return null;
 451                         } else {
 452                                 SatelliteContractVersionAttribute sat_attr =
 453                                         (SatelliteContractVersionAttribute) attrs[0];
 454
 455                                 /* Version(string) can throw
 456                                  * ArgumentException if the version is
 457                                  * invalid, but the spec for
 458                                  * GetSatelliteContractVersion says we
 459                                  * can throw the same exception for
 460                                  * the same reason, so dont bother to
 461                                  * catch it.
 462                                  */
 463                                 return new Version (sat_attr.Version);
 464                         }
 465                 }
 466
 467                 [MonoTODO ("the property exists but is not respected")]
 468                 protected UltimateResourceFallbackLocation FallbackLocation {
 469                         get { return fallbackLocation; }
 470                         set { fallbackLocation = value; }
 471                 }
 472
 473
 474                 MissingManifestResourceException AssemblyResourceMissing (string fileName)
 475                 {
 476                         AssemblyName aname = MainAssembly != null ? MainAssembly.GetName ()
 477                                 : null;
 478
 479                         string manifestName = GetManifestResourceName (fileName);
 480                         string msg = string.Format ("Could not find any resources " +
 481                                 "appropriate for the specified culture or the " +
 482                                 "neutral culture.  Make sure \"{0}\" was correctly " +
 483                                 "embedded or linked into assembly \"{1}\" at " +
 484                                 "compile time, or that all the satellite assemblies " +
 485                                 "required are loadable and fully signed.",
 486                                 manifestName, aname != null ? aname.Name : string.Empty);
 487                         throw new MissingManifestResourceException (msg);
 488                 }
 489
 490                 string GetManifestResourceName (string fn)
 491                 {
 492                         string resourceName = null;
 493                         if (resourceSource != null) {
 494                                 if (resourceSource.Namespace != null && resourceSource.Namespace.Length > 0)
 495                                         resourceName = string.Concat (resourceSource.Namespace,
 496                                                 ".", fn);
 497                                 else
 498                                         resourceName = fn;
 499                         } else {
 500                                 resourceName = fn;
 501                         }
 502                         return resourceName;
 503                 }
 504         }
 505 }