class/System/System.ComponentModel/TypeDescriptor.cs

   1 //
   2 // System.ComponentModel.TypeDescriptor.cs
   3 //
   4 // Authors:
   5 //   Gonzalo Paniagua Javier (gonzalo@ximian.com)
   6 //   Andreas Nahr (ClassDevelopment@A-SoftTech.com)
   7 //   Ivan N. Zlatev (contact@i-nz.net)
   8 //
   9 //
  10 // (C) 2002 Ximian, Inc (http://www.ximian.com)
  11 // (C) 2003 Andreas Nahr
  12 // (C) 2008 Novell, Inc (http://www.novell.com)
  13 //
  14
  15 //
  16 // Permission is hereby granted, free of charge, to any person obtaining
  17 // a copy of this software and associated documentation files (the
  18 // "Software"), to deal in the Software without restriction, including
  19 // without limitation the rights to use, copy, modify, merge, publish,
  20 // distribute, sublicense, and/or sell copies of the Software, and to
  21 // permit persons to whom the Software is furnished to do so, subject to
  22 // the following conditions:
  23 //
  24 // The above copyright notice and this permission notice shall be
  25 // included in all copies or substantial portions of the Software.
  26 //
  27 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  28 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  29 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  30 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  31 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  32 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  33 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  34 //
  35
  36 using System.Collections;
  37 using System.Reflection;
  38 using System.Globalization;
  39 using System.ComponentModel.Design;
  40 using System.Security.Permissions;
  41
  42 #if NET_2_0
  43 using System.Collections.Generic;
  44 #endif
  45
  46 namespace System.ComponentModel
  47 {
  48
  49 public sealed class TypeDescriptor
  50 {
  51         private static readonly object creatingDefaultConverters = new object ();
  52         private static ArrayList defaultConverters;
  53         private static IComNativeDescriptorHandler descriptorHandler;
  54         private static Hashtable componentTable = new Hashtable ();
  55         private static Hashtable typeTable = new Hashtable ();
  56         private static Hashtable editors;
  57
  58 #if NET_2_0
  59         static object typeDescriptionProvidersLock = new object ();
  60         static Dictionary <Type, LinkedList <TypeDescriptionProvider>> typeDescriptionProviders;
  61
  62         static object componentDescriptionProvidersLock = new object ();
  63         static Dictionary <WeakObjectWrapper, LinkedList <TypeDescriptionProvider>> componentDescriptionProviders;
  64
  65         static TypeDescriptor ()
  66         {
  67                 typeDescriptionProviders = new Dictionary <Type, LinkedList <TypeDescriptionProvider>> ();
  68                 componentDescriptionProviders = new Dictionary <WeakObjectWrapper, LinkedList <TypeDescriptionProvider>> (new WeakObjectWrapperComparer ());
  69         }
  70 #endif
  71         private TypeDescriptor ()
  72         {
  73         }
  74
  75 #if NET_2_0
  76         [MonoNotSupported ("Mono does not support COM")]
  77         [EditorBrowsable (EditorBrowsableState.Advanced)]
  78         public static Type ComObjectType {
  79                 get { throw new NotImplementedException (); }
  80         }
  81
  82         [EditorBrowsable (EditorBrowsableState.Advanced)]
  83         public static TypeDescriptionProvider AddAttributes (object instance, params Attribute [] attributes)
  84         {
  85                 if (instance == null)
  86                         throw new ArgumentNullException ("instance");
  87                 if (attributes == null)
  88                         throw new ArgumentNullException ("attributes");
  89
  90                 var ret = new AttributeProvider (attributes, GetProvider (instance));
  91                 AddProvider (ret, instance);
  92
  93                 return ret;
  94         }
  95
  96         [EditorBrowsable (EditorBrowsableState.Advanced)]
  97         public static TypeDescriptionProvider AddAttributes (Type type, params Attribute [] attributes)
  98         {
  99                 if (type == null)
 100                         throw new ArgumentNullException ("type");
 101                 if (attributes == null)
 102                         throw new ArgumentNullException ("attributes");
 103
 104                 var ret = new AttributeProvider (attributes, GetProvider (type));
 105                 AddProvider (ret, type);
 106
 107                 return ret;
 108         }
 109
 110         [EditorBrowsable (EditorBrowsableState.Advanced)]
 111         public static void AddProvider (TypeDescriptionProvider provider, object instance)
 112         {
 113                 if (provider == null)
 114                         throw new ArgumentNullException ("provider");
 115                 if (instance == null)
 116                         throw new ArgumentNullException ("instance");
 117
 118                 lock (componentDescriptionProvidersLock) {
 119                         LinkedList <TypeDescriptionProvider> plist;
 120                         WeakObjectWrapper instanceWrapper = new WeakObjectWrapper (instance);
 121
 122                         if (!componentDescriptionProviders.TryGetValue (instanceWrapper, out plist)) {
 123                                 plist = new LinkedList <TypeDescriptionProvider> ();
 124                                 componentDescriptionProviders.Add (new WeakObjectWrapper (instance), plist);
 125                         }
 126
 127                         plist.AddLast (provider);
 128                         instanceWrapper = null;
 129                         Refresh (instance);
 130                 }
 131         }
 132
 133         [EditorBrowsable (EditorBrowsableState.Advanced)]
 134         public static void AddProvider (TypeDescriptionProvider provider, Type type)
 135         {
 136                 if (provider == null)
 137                         throw new ArgumentNullException ("provider");
 138                 if (type == null)
 139                         throw new ArgumentNullException ("type");
 140
 141                 lock (typeDescriptionProvidersLock) {
 142                         LinkedList <TypeDescriptionProvider> plist;
 143
 144                         if (!typeDescriptionProviders.TryGetValue (type, out plist)) {
 145                                 plist = new LinkedList <TypeDescriptionProvider> ();
 146                                 typeDescriptionProviders.Add (type, plist);
 147                         }
 148
 149                         plist.AddLast (provider);
 150                         Refresh (type);
 151                 }
 152         }
 153
 154         [MonoTODO]
 155         public static object CreateInstance (IServiceProvider provider, Type objectType, Type [] argTypes, object [] args)
 156         {
 157                 if (objectType == null)
 158                         throw new ArgumentNullException ("objectType");
 159
 160                 object instance = null;
 161
 162                 if (provider != null) {
 163                         TypeDescriptionProvider typeDescrProvider = provider.GetService (typeof (TypeDescriptionProvider)) as TypeDescriptionProvider;
 164                         if (typeDescrProvider != null)
 165                                 instance = typeDescrProvider.CreateInstance (provider, objectType, argTypes, args);
 166                 }
 167
 168                 // TODO: also search and use the internal providers table once Add/RemoveProvider have been implemented
 169
 170                 if (instance == null)
 171                         instance = Activator.CreateInstance (objectType, args);
 172
 173                 return instance;
 174         }
 175 #endif
 176
 177 #if NET_2_0
 178         [EditorBrowsable (EditorBrowsableState.Advanced)]
 179 #endif
 180 #if !NET_2_1
 181         public
 182 #else
 183         internal
 184 #endif
 185         static void AddEditorTable (Type editorBaseType, Hashtable table)
 186         {
 187                 if (editorBaseType == null)
 188                         throw new ArgumentNullException ("editorBaseType");
 189
 190                 if (editors == null)
 191                         editors = new Hashtable ();
 192
 193                 if (!editors.ContainsKey (editorBaseType))
 194                         editors [editorBaseType] = table;
 195         }
 196
 197         public static IDesigner CreateDesigner(IComponent component, Type designerBaseType)
 198         {
 199                 string tn = designerBaseType.AssemblyQualifiedName;
 200                 AttributeCollection col = GetAttributes (component);
 201
 202                 foreach (Attribute at in col) {
 203                         DesignerAttribute dat = at as DesignerAttribute;
 204                         if (dat != null && tn == dat.DesignerBaseTypeName) {
 205                                 Type designerType = GetTypeFromName (component, dat.DesignerTypeName);
 206                                 if (designerType != null)
 207                                         return (IDesigner) Activator.CreateInstance (designerType);
 208                         }
 209                 }
 210
 211                 return null;
 212         }
 213
 214         [ReflectionPermission (SecurityAction.LinkDemand, TypeInformation = true, MemberAccess = true)]
 215         public static EventDescriptor CreateEvent (Type componentType,
 216                                                    string name,
 217                                                    Type type,
 218                                                    params Attribute [] attributes)
 219         {
 220                 return new ReflectionEventDescriptor (componentType, name, type, attributes);
 221         }
 222
 223         [ReflectionPermission (SecurityAction.LinkDemand, TypeInformation = true, MemberAccess = true)]
 224         public static EventDescriptor CreateEvent (Type componentType,
 225                                                    EventDescriptor oldEventDescriptor,
 226                                                    params Attribute [] attributes)
 227         {
 228                 return new ReflectionEventDescriptor (componentType, oldEventDescriptor, attributes);
 229         }
 230
 231         [ReflectionPermission (SecurityAction.LinkDemand, TypeInformation = true, MemberAccess = true)]
 232         public static PropertyDescriptor CreateProperty (Type componentType,
 233                                                          string name,
 234                                                          Type type,
 235                                                          params Attribute [] attributes)
 236         {
 237                 return new ReflectionPropertyDescriptor (componentType, name, type, attributes);
 238         }
 239
 240         [ReflectionPermission (SecurityAction.LinkDemand, TypeInformation = true, MemberAccess = true)]
 241         public static PropertyDescriptor CreateProperty (Type componentType,
 242                                                          PropertyDescriptor oldPropertyDescriptor,
 243                                                          params Attribute [] attributes)
 244         {
 245                 return new ReflectionPropertyDescriptor (componentType, oldPropertyDescriptor, attributes);
 246         }
 247
 248         public static AttributeCollection GetAttributes (Type componentType)
 249         {
 250                 if (componentType == null)
 251                         return AttributeCollection.Empty;
 252
 253                 return GetTypeInfo (componentType).GetAttributes ();
 254         }
 255
 256         public static AttributeCollection GetAttributes (object component)
 257         {
 258                 return GetAttributes (component, false);
 259         }
 260
 261 #if NET_2_0
 262         [EditorBrowsable (EditorBrowsableState.Advanced)]
 263 #endif
 264         public static AttributeCollection GetAttributes (object component, bool noCustomTypeDesc)
 265         {
 266                 if (component == null)
 267                         return AttributeCollection.Empty;
 268
 269                 if (noCustomTypeDesc == false && component is ICustomTypeDescriptor) {
 270                         return ((ICustomTypeDescriptor) component).GetAttributes ();
 271                 } else {
 272                         IComponent com = component as IComponent;
 273                         if (com != null && com.Site != null)
 274                                 return GetComponentInfo (com).GetAttributes ();
 275                         else
 276                                 return GetTypeInfo (component.GetType()).GetAttributes ();
 277                 }
 278         }
 279
 280         public static string GetClassName (object component)
 281         {
 282                 return GetClassName (component, false);
 283         }
 284
 285 #if NET_2_0
 286         [EditorBrowsable (EditorBrowsableState.Advanced)]
 287 #endif
 288         public static string GetClassName (object component, bool noCustomTypeDesc)
 289         {
 290                 if (component == null)
 291                         throw new ArgumentNullException ("component", "component cannot be null");
 292
 293                 if (noCustomTypeDesc == false && component is ICustomTypeDescriptor) {
 294                         String res = ((ICustomTypeDescriptor) component).GetClassName ();
 295                         if (res == null)
 296                                 res = ((ICustomTypeDescriptor) component).GetComponentName ();
 297                         if (res == null)
 298                                 res = component.GetType ().FullName;
 299                         return res;
 300                 } else {
 301                         return component.GetType ().FullName;
 302                 }
 303         }
 304
 305         public static string GetComponentName (object component)
 306         {
 307                 return GetComponentName (component, false);
 308         }
 309
 310 #if NET_2_0
 311         [EditorBrowsable (EditorBrowsableState.Advanced)]
 312 #endif
 313         public static string GetComponentName (object component, bool noCustomTypeDesc)
 314         {
 315                 if (component == null)
 316                         throw new ArgumentNullException ("component", "component cannot be null");
 317
 318                 if (noCustomTypeDesc == false && component is ICustomTypeDescriptor) {
 319                         return ((ICustomTypeDescriptor) component).GetComponentName ();
 320                 } else {
 321                         IComponent c = component as IComponent;
 322                         if (c != null && c.Site != null)
 323                                 return c.Site.Name;
 324 #if NET_2_0
 325                         return null;
 326 #else
 327                         return component.GetType().Name;
 328 #endif
 329                 }
 330         }
 331
 332 #if NET_2_0
 333         [MonoNotSupported("")]
 334         public static string GetFullComponentName (object component)
 335         {
 336                 throw new NotImplementedException ();
 337         }
 338
 339         [MonoNotSupported("")]
 340         public static string GetClassName (Type componentType)
 341         {
 342                 throw new NotImplementedException ();
 343         }
 344 #endif
 345
 346         public static TypeConverter GetConverter (object component)
 347         {
 348                 return GetConverter (component, false);
 349         }
 350
 351 #if NET_2_0
 352         [EditorBrowsable (EditorBrowsableState.Advanced)]
 353 #endif
 354         public static TypeConverter GetConverter (object component, bool noCustomTypeDesc)
 355         {
 356                 if (component == null)
 357                         throw new ArgumentNullException ("component", "component cannot be null");
 358
 359                 if (noCustomTypeDesc == false && component is ICustomTypeDescriptor) {
 360                         return ((ICustomTypeDescriptor) component).GetConverter ();
 361                 }
 362                 else {
 363                         Type converterType = null;
 364                         AttributeCollection atts = GetAttributes (component, false);
 365                         TypeConverterAttribute tca = (TypeConverterAttribute) atts[typeof(TypeConverterAttribute)];
 366                         if (tca != null && tca.ConverterTypeName.Length > 0)
 367                                 converterType = GetTypeFromName (component as IComponent, tca.ConverterTypeName);
 368                         if (converterType == null)
 369                                 converterType = FindDefaultConverterType (component.GetType ());
 370
 371                         if (converterType != null) {
 372                                 ConstructorInfo ci = converterType.GetConstructor (new Type[] { typeof(Type) });
 373                                 if (ci != null)
 374                                         return (TypeConverter) ci.Invoke (new object[] { component.GetType () });
 375                                 else
 376                                         return (TypeConverter) Activator.CreateInstance (converterType);
 377                         } else
 378                                 return null;
 379                 }
 380         }
 381
 382         private static ArrayList DefaultConverters
 383         {
 384                 get {
 385                         lock (creatingDefaultConverters) {
 386                                 if (defaultConverters != null)
 387                                         return defaultConverters;
 388
 389                                 defaultConverters = new ArrayList ();
 390                                 defaultConverters.Add (new DictionaryEntry (typeof (bool), typeof (BooleanConverter)));
 391                                 defaultConverters.Add (new DictionaryEntry (typeof (byte), typeof (ByteConverter)));
 392                                 defaultConverters.Add (new DictionaryEntry (typeof (sbyte), typeof (SByteConverter)));
 393                                 defaultConverters.Add (new DictionaryEntry (typeof (string), typeof (StringConverter)));
 394                                 defaultConverters.Add (new DictionaryEntry (typeof (char), typeof (CharConverter)));
 395                                 defaultConverters.Add (new DictionaryEntry (typeof (short), typeof (Int16Converter)));
 396                                 defaultConverters.Add (new DictionaryEntry (typeof (int), typeof (Int32Converter)));
 397                                 defaultConverters.Add (new DictionaryEntry (typeof (long), typeof (Int64Converter)));
 398                                 defaultConverters.Add (new DictionaryEntry (typeof (ushort), typeof (UInt16Converter)));
 399                                 defaultConverters.Add (new DictionaryEntry (typeof (uint), typeof (UInt32Converter)));
 400                                 defaultConverters.Add (new DictionaryEntry (typeof (ulong), typeof (UInt64Converter)));
 401                                 defaultConverters.Add (new DictionaryEntry (typeof (float), typeof (SingleConverter)));
 402                                 defaultConverters.Add (new DictionaryEntry (typeof (double), typeof (DoubleConverter)));
 403                                 defaultConverters.Add (new DictionaryEntry (typeof (decimal), typeof (DecimalConverter)));
 404                                 defaultConverters.Add (new DictionaryEntry (typeof (void), typeof (TypeConverter)));
 405                                 defaultConverters.Add (new DictionaryEntry (typeof (Array), typeof (ArrayConverter)));
 406                                 defaultConverters.Add (new DictionaryEntry (typeof (CultureInfo), typeof (CultureInfoConverter)));
 407                                 defaultConverters.Add (new DictionaryEntry (typeof (DateTime), typeof (DateTimeConverter)));
 408                                 defaultConverters.Add (new DictionaryEntry (typeof (Guid), typeof (GuidConverter)));
 409                                 defaultConverters.Add (new DictionaryEntry (typeof (TimeSpan), typeof (TimeSpanConverter)));
 410                                 defaultConverters.Add (new DictionaryEntry (typeof (ICollection), typeof (CollectionConverter)));
 411                                 defaultConverters.Add (new DictionaryEntry (typeof (Enum), typeof (EnumConverter)));
 412                         }
 413                         return defaultConverters;
 414                 }
 415         }
 416
 417         public static TypeConverter GetConverter (Type type)
 418         {
 419                 if (type == null)
 420                         throw new ArgumentNullException ("type");
 421
 422                 Type converterType = null;
 423                 AttributeCollection atts = GetAttributes (type);
 424                 TypeConverterAttribute tca = (TypeConverterAttribute) atts[typeof(TypeConverterAttribute)];
 425                 if (tca != null && tca.ConverterTypeName.Length > 0)
 426                         converterType = GetTypeFromName (null, tca.ConverterTypeName);
 427                 if (converterType == null)
 428                         converterType = FindDefaultConverterType (type);
 429
 430                 if (converterType != null) {
 431                         ConstructorInfo ci = converterType.GetConstructor (new Type[] { typeof(Type) });
 432                         if (ci != null)
 433                                 return (TypeConverter) ci.Invoke (new object[] { type });
 434                         else
 435                                 return (TypeConverter) Activator.CreateInstance (converterType);
 436                 }
 437                 else
 438                         return null;
 439         }
 440
 441         private static Type FindDefaultConverterType (Type type)
 442         {
 443                 Type converterType = null;
 444                 if (type != null) {
 445 #if NET_2_0
 446                         if (type.IsGenericType && type.GetGenericTypeDefinition() == typeof(Nullable<>))
 447                                 return typeof(NullableConverter);
 448 #endif
 449                         // Is there a default converter
 450                         foreach (DictionaryEntry entry in DefaultConverters) {
 451                                 if ((Type)entry.Key == type)
 452                                         return (Type)entry.Value;
 453                         }
 454                 }
 455
 456                 // Find default converter with a baseType this baseType is assignable to
 457                 Type baseType = type;
 458                 while (baseType != null && baseType != typeof (object)) {
 459                         foreach (DictionaryEntry entry in DefaultConverters) {
 460                                 Type defType = (Type)entry.Key;
 461                                 if (defType.IsAssignableFrom (baseType)) {
 462                                         converterType = (Type)entry.Value;
 463                                         break;
 464                                 }
 465                         }
 466                         baseType = baseType.BaseType;
 467                 }
 468
 469                 if (converterType == null) {
 470                         if (type != null && type.IsInterface)
 471                                 converterType = typeof (ReferenceConverter);
 472                         else
 473                                 converterType = typeof (TypeConverter);
 474                 }
 475
 476                 return converterType;
 477         }
 478
 479         public static EventDescriptor GetDefaultEvent (Type componentType)
 480         {
 481                 return GetTypeInfo (componentType).GetDefaultEvent ();
 482         }
 483
 484         public static EventDescriptor GetDefaultEvent (object component)
 485         {
 486                 return GetDefaultEvent (component, false);
 487         }
 488
 489 #if NET_2_0
 490         [EditorBrowsable (EditorBrowsableState.Advanced)]
 491 #endif
 492         public static EventDescriptor GetDefaultEvent (object component, bool noCustomTypeDesc)
 493         {
 494                 if (!noCustomTypeDesc && (component is ICustomTypeDescriptor))
 495                         return ((ICustomTypeDescriptor) component).GetDefaultEvent ();
 496                 else {
 497                         IComponent com = component as IComponent;
 498                         if (com != null && com.Site != null)
 499                                 return GetComponentInfo (com).GetDefaultEvent ();
 500                         else
 501                                 return GetTypeInfo (component.GetType()).GetDefaultEvent ();
 502                 }
 503         }
 504
 505         public static PropertyDescriptor GetDefaultProperty (Type componentType)
 506         {
 507                 return GetTypeInfo (componentType).GetDefaultProperty ();
 508         }
 509
 510         public static PropertyDescriptor GetDefaultProperty (object component)
 511         {
 512                 return GetDefaultProperty (component, false);
 513         }
 514
 515 #if NET_2_0
 516         [EditorBrowsable (EditorBrowsableState.Advanced)]
 517 #endif
 518         public static PropertyDescriptor GetDefaultProperty (object component, bool noCustomTypeDesc)
 519         {
 520                 if (!noCustomTypeDesc && (component is ICustomTypeDescriptor))
 521                         return ((ICustomTypeDescriptor) component).GetDefaultProperty ();
 522                 else {
 523                         IComponent com = component as IComponent;
 524                         if (com != null && com.Site != null)
 525                                 return GetComponentInfo (com).GetDefaultProperty ();
 526                         else
 527                                 return GetTypeInfo (component.GetType()).GetDefaultProperty ();
 528                 }
 529         }
 530
 531         internal static object CreateEditor (Type t, Type componentType)
 532         {
 533                 if (t == null)
 534                         return null;
 535
 536                 try {
 537                         return Activator.CreateInstance (t);
 538                 } catch {}
 539
 540                 try {
 541                         return Activator.CreateInstance (t, new object [] {componentType});
 542                 } catch {}
 543
 544                 return null;
 545         }
 546
 547         private static object FindEditorInTable (Type componentType, Type editorBaseType, Hashtable table)
 548         {
 549                 object editorReference = null;
 550                 object editor = null;
 551
 552                 if (componentType == null || editorBaseType == null || table == null)
 553                         return null;
 554
 555                 Type ct = componentType;
 556                 while (ct != null) {
 557                         editorReference = table [ct];
 558                         if (editorReference != null)
 559                                 break;
 560                         ct = ct.BaseType;
 561                 }
 562
 563                 if (editorReference == null) {
 564                         foreach (Type iface in componentType.GetInterfaces ()) {
 565                                 editorReference = table [iface];
 566                                 if (editorReference != null)
 567                                         break;
 568                         }
 569                 }
 570
 571                 if (editorReference == null)
 572                         return null;
 573
 574                 if (editorReference is string)
 575                         editor = CreateEditor (Type.GetType ((string) editorReference), componentType);
 576                 else if (editorReference is Type)
 577                         editor = CreateEditor ((Type) editorReference, componentType);
 578                 else if (editorReference.GetType ().IsSubclassOf (editorBaseType))
 579                         editor = editorReference;
 580
 581                 if (editor != null)
 582                         table [componentType] = editor;
 583
 584                 return editor;
 585         }
 586
 587         public static object GetEditor (Type componentType, Type editorBaseType)
 588         {
 589                 Type editorType = null;
 590                 object editor = null;
 591                 object [] atts = componentType.GetCustomAttributes (typeof(EditorAttribute), true);
 592
 593                 if (atts != null && atts.Length != 0) {
 594                         foreach (EditorAttribute ea in atts) {
 595                                 editorType = GetTypeFromName (null, ea.EditorTypeName);
 596                                 if (editorType != null && editorType.IsSubclassOf(editorBaseType))
 597                                         break;
 598                         }
 599                 }
 600
 601                 if (editorType != null)
 602                         editor = CreateEditor (editorType, componentType);
 603
 604                 if (editorType == null || editor == null) {
 605 #if !TARGET_JVM
 606                         // Make sure the editorBaseType's static constructor has been called,
 607                         // since that's where we're putting the initialization of its editor table.
 608
 609                         System.Runtime.CompilerServices.RuntimeHelpers.RunClassConstructor (editorBaseType.TypeHandle);
 610 #endif
 611                         if (editors != null)
 612                                 editor = FindEditorInTable (componentType, editorBaseType, editors [editorBaseType] as Hashtable);
 613                 }
 614
 615                 return editor;
 616         }
 617
 618         public static object GetEditor (object component, Type editorBaseType)
 619         {
 620                 return GetEditor (component, editorBaseType, false);
 621         }
 622
 623 #if NET_2_0
 624         [EditorBrowsable (EditorBrowsableState.Advanced)]
 625 #endif
 626         public static object GetEditor (object component, Type editorBaseType, bool noCustomTypeDesc)
 627         {
 628                 if (component == null)
 629                         throw new ArgumentNullException ("component");
 630                 if (editorBaseType == null)
 631                         throw new ArgumentNullException ("editorBaseType");
 632
 633                 if (!noCustomTypeDesc && (component is ICustomTypeDescriptor))
 634                         return ((ICustomTypeDescriptor) component).GetEditor (editorBaseType);
 635
 636                 object [] atts = component.GetType ().GetCustomAttributes (typeof (EditorAttribute), true);
 637                 if (atts.Length == 0)
 638                         return null;
 639                 string target = editorBaseType.AssemblyQualifiedName;
 640
 641                 foreach (EditorAttribute ea in atts){
 642                         if (ea.EditorBaseTypeName == target){
 643                                 Type t = Type.GetType (ea.EditorTypeName, true);
 644
 645                                 return Activator.CreateInstance (t);
 646                         }
 647                 }
 648                 return null;
 649         }
 650
 651         public static EventDescriptorCollection GetEvents (object component)
 652         {
 653                 return GetEvents (component, false);
 654         }
 655
 656         public static EventDescriptorCollection GetEvents (Type componentType)
 657         {
 658                 return GetEvents (componentType, null);
 659         }
 660
 661         public static EventDescriptorCollection GetEvents (object component, Attribute [] attributes)
 662         {
 663                 return GetEvents (component, attributes, false);
 664         }
 665
 666 #if NET_2_0
 667         [EditorBrowsable (EditorBrowsableState.Advanced)]
 668 #endif
 669         public static EventDescriptorCollection GetEvents (object component, bool noCustomTypeDesc)
 670         {
 671                 if (!noCustomTypeDesc && (component is ICustomTypeDescriptor))
 672                         return ((ICustomTypeDescriptor) component).GetEvents ();
 673                 else {
 674                         IComponent com = component as IComponent;
 675                         if (com != null && com.Site != null)
 676                                 return GetComponentInfo (com).GetEvents ();
 677                         else
 678                                 return GetTypeInfo (component.GetType()).GetEvents ();
 679                 }
 680         }
 681
 682         public static EventDescriptorCollection GetEvents (Type componentType, Attribute [] attributes)
 683         {
 684                 return GetTypeInfo (componentType).GetEvents (attributes);
 685         }
 686
 687 #if NET_2_0
 688         [EditorBrowsable (EditorBrowsableState.Advanced)]
 689 #endif
 690         public static EventDescriptorCollection GetEvents (object component, Attribute [] attributes, bool noCustomTypeDesc)
 691         {
 692                 if (!noCustomTypeDesc && (component is ICustomTypeDescriptor))
 693                         return ((ICustomTypeDescriptor) component).GetEvents (attributes);
 694                 else {
 695                         IComponent com = component as IComponent;
 696                         if (com != null && com.Site != null)
 697                                 return GetComponentInfo (com).GetEvents (attributes);
 698                         else
 699                                 return GetTypeInfo (component.GetType()).GetEvents (attributes);
 700                 }
 701         }
 702
 703         public static PropertyDescriptorCollection GetProperties (object component)
 704         {
 705                 return GetProperties (component, false);
 706         }
 707
 708         public static PropertyDescriptorCollection GetProperties (Type componentType)
 709         {
 710                 return GetProperties (componentType, null);
 711         }
 712
 713         public static PropertyDescriptorCollection GetProperties (object component, Attribute [] attributes)
 714         {
 715                 return GetProperties (component, attributes, false);
 716         }
 717
 718         public static PropertyDescriptorCollection GetProperties (object component, Attribute [] attributes, bool noCustomTypeDesc)
 719         {
 720                 if (component == null)
 721                         return PropertyDescriptorCollection.Empty;
 722
 723                 if (!noCustomTypeDesc && (component is ICustomTypeDescriptor))
 724                         return ((ICustomTypeDescriptor) component).GetProperties (attributes);
 725                 else {
 726                         IComponent com = component as IComponent;
 727                         if (com != null && com.Site != null)
 728                                 return GetComponentInfo (com).GetProperties (attributes);
 729                         else
 730                                 return GetTypeInfo (component.GetType()).GetProperties (attributes);
 731                 }
 732         }
 733
 734 #if NET_2_0
 735         [EditorBrowsable (EditorBrowsableState.Advanced)]
 736 #endif
 737         public static PropertyDescriptorCollection GetProperties (object component, bool noCustomTypeDesc)
 738         {
 739                 if (component == null)
 740                         return PropertyDescriptorCollection.Empty;
 741
 742                 if (!noCustomTypeDesc && (component is ICustomTypeDescriptor))
 743                         return ((ICustomTypeDescriptor) component).GetProperties ();
 744                 else {
 745                         IComponent com = component as IComponent;
 746                         if (com != null && com.Site != null)
 747                                 return GetComponentInfo (com).GetProperties ();
 748                         else
 749                                 return GetTypeInfo (component.GetType()).GetProperties ();
 750                 }
 751         }
 752
 753         public static PropertyDescriptorCollection GetProperties (Type componentType, Attribute [] attributes)
 754         {
 755                 return GetTypeInfo (componentType).GetProperties (attributes);
 756         }
 757
 758 #if NET_2_0
 759         [EditorBrowsable (EditorBrowsableState.Advanced)]
 760         public static TypeDescriptionProvider GetProvider (object instance)
 761         {
 762                 if (instance == null)
 763                         throw new ArgumentNullException ("instance");
 764
 765                 TypeDescriptionProvider ret = null;
 766                 lock (componentDescriptionProvidersLock) {
 767                         LinkedList <TypeDescriptionProvider> plist;
 768                         WeakObjectWrapper instanceWrapper = new WeakObjectWrapper (instance);
 769
 770                         if (componentDescriptionProviders.TryGetValue (instanceWrapper, out plist) && plist.Count > 0)
 771                                 ret = plist.Last.Value;
 772
 773                         instanceWrapper = null;
 774                 }
 775
 776                 if (ret == null)
 777                         ret = GetProvider (instance.GetType ());
 778
 779                 if (ret == null)
 780                         return new DefaultTypeDescriptionProvider ();
 781                 else
 782                         return new WrappedTypeDescriptionProvider (ret);
 783         }
 784
 785         [EditorBrowsable (EditorBrowsableState.Advanced)]
 786         public static TypeDescriptionProvider GetProvider (Type type)
 787         {
 788                 if (type == null)
 789                         throw new ArgumentNullException ("type");
 790
 791                 TypeDescriptionProvider ret = null;
 792                 lock (typeDescriptionProvidersLock) {
 793                         LinkedList <TypeDescriptionProvider> plist;
 794
 795                         while (!typeDescriptionProviders.TryGetValue (type, out plist)) {
 796                                 plist = null;
 797                                 type = type.BaseType;
 798                                 if (type == null)
 799                                         break;
 800                         }
 801
 802                         if (plist != null && plist.Count > 0)
 803                                 ret = plist.Last.Value;
 804                 }
 805
 806                 if (ret == null)
 807                         return new DefaultTypeDescriptionProvider ();
 808                 else
 809                         return new WrappedTypeDescriptionProvider (ret);
 810         }
 811
 812         [EditorBrowsable (EditorBrowsableState.Advanced)]
 813         public static Type GetReflectionType (object instance)
 814         {
 815                 if (instance == null)
 816                         throw new ArgumentNullException ("instance");
 817
 818                 return instance.GetType ();
 819         }
 820
 821         [EditorBrowsable (EditorBrowsableState.Advanced)]
 822         public static Type GetReflectionType (Type type)
 823         {
 824                 if (type == null)
 825                         throw new ArgumentNullException ("type");
 826
 827                 return type;
 828         }
 829
 830         [MonoNotSupported("Associations not supported")]
 831         [EditorBrowsable (EditorBrowsableState.Advanced)]
 832         public static void CreateAssociation (object primary, object secondary)
 833         {
 834                 throw new NotImplementedException ();
 835         }
 836
 837         [MonoNotSupported ("Associations not supported")]
 838         [EditorBrowsable (EditorBrowsableState.Advanced)]
 839         public static object GetAssociation (Type type, object primary)
 840         {
 841                 throw new NotImplementedException ();
 842         }
 843
 844         [MonoNotSupported ("Associations not supported")]
 845         [EditorBrowsable (EditorBrowsableState.Advanced)]
 846         public static void RemoveAssociation (object primary, object secondary)
 847         {
 848                 throw new NotImplementedException ();
 849         }
 850
 851         [MonoNotSupported ("Associations not supported")]
 852         [EditorBrowsable (EditorBrowsableState.Advanced)]
 853         public static void RemoveAssociations (object primary)
 854         {
 855                 throw new NotImplementedException ();
 856         }
 857
 858         [EditorBrowsable (EditorBrowsableState.Advanced)]
 859         public static void RemoveProvider (TypeDescriptionProvider provider, object instance)
 860         {
 861                 if (provider == null)
 862                         throw new ArgumentNullException ("provider");
 863                 if (instance == null)
 864                         throw new ArgumentNullException ("instance");
 865
 866                 //bool removed = false;
 867                 lock (componentDescriptionProvidersLock) {
 868                         LinkedList <TypeDescriptionProvider> plist;
 869                         WeakObjectWrapper instanceWrapper = new WeakObjectWrapper (instance);
 870
 871                         if (componentDescriptionProviders.TryGetValue (instanceWrapper, out plist) && plist.Count > 0) {
 872                                 RemoveProvider (provider, plist);
 873                                 //removed = true;
 874                         }
 875
 876                         instanceWrapper = null;
 877                 }
 878
 879                 var refreshed = Refreshed;
 880                 if (refreshed != null)
 881                         refreshed (new RefreshEventArgs (instance));
 882         }
 883
 884         [EditorBrowsable (EditorBrowsableState.Advanced)]
 885         public static void RemoveProvider (TypeDescriptionProvider provider, Type type)
 886         {
 887                 if (provider == null)
 888                         throw new ArgumentNullException ("provider");
 889                 if (type == null)
 890                         throw new ArgumentNullException ("type");
 891
 892                 lock (typeDescriptionProvidersLock) {
 893                         LinkedList <TypeDescriptionProvider> plist;
 894
 895                         if (typeDescriptionProviders.TryGetValue (type, out plist) && plist.Count > 0) {
 896                                 RemoveProvider (provider, plist);
 897                         }
 898                 }
 899
 900                 var refreshed = Refreshed;
 901                 if (refreshed != null)
 902                         refreshed (new RefreshEventArgs (type));
 903         }
 904
 905         static void RemoveProvider (TypeDescriptionProvider provider, LinkedList <TypeDescriptionProvider> plist)
 906         {
 907                 LinkedListNode <TypeDescriptionProvider> node = plist.Last;
 908                 LinkedListNode <TypeDescriptionProvider> first = plist.First;
 909                 TypeDescriptionProvider p;
 910
 911                 do {
 912                         p = node.Value;
 913                         if (p == provider) {
 914                                 plist.Remove (node);
 915                                 break;
 916                         }
 917                         if (node == first)
 918                                 break;
 919
 920                         node = node.Previous;
 921
 922                 } while (true);
 923         }
 924 #endif
 925
 926         public static void SortDescriptorArray (IList infos)
 927         {
 928                 string[] names = new string [infos.Count];
 929                 object[] values = new object [infos.Count];
 930                 for (int n=0; n<names.Length; n++) {
 931                         names[n] = ((MemberDescriptor)infos[n]).Name;
 932                         values[n] = infos[n];
 933                 }
 934                 Array.Sort (names, values);
 935                 infos.Clear();
 936                 foreach (object ob in values)
 937                         infos.Add (ob);
 938         }
 939
 940 #if NET_2_0
 941         // well, ComObjectType is not implemented, but we don't support COM anyways ...
 942         [Obsolete ("Use ComObjectType")]
 943 #endif
 944         public static IComNativeDescriptorHandler ComNativeDescriptorHandler {
 945                 [PermissionSet (SecurityAction.LinkDemand, Unrestricted = true)]
 946                 get { return descriptorHandler; }
 947                 [PermissionSet (SecurityAction.LinkDemand, Unrestricted = true)]
 948                 set { descriptorHandler = value; }
 949         }
 950
 951         public static void Refresh (Assembly assembly)
 952         {
 953                 foreach (Type type in assembly.GetTypes())
 954                         Refresh (type);
 955         }
 956
 957         public static void Refresh (Module module)
 958         {
 959                 foreach (Type type in module.GetTypes())
 960                         Refresh (type);
 961         }
 962
 963         public static void Refresh (object component)
 964         {
 965                 lock (componentTable)
 966                 {
 967                         componentTable.Remove (component);
 968                 }
 969                 if (Refreshed != null) Refreshed (new RefreshEventArgs (component));
 970         }
 971
 972         public static void Refresh (Type type)
 973         {
 974                 lock (typeTable)
 975                 {
 976                         typeTable.Remove (type);
 977                 }
 978                 if (Refreshed != null) Refreshed (new RefreshEventArgs (type));
 979         }
 980
 981         static EventHandler onDispose;
 982
 983         static void OnComponentDisposed (object sender, EventArgs args)
 984         {
 985                 lock (componentTable) {
 986                         componentTable.Remove (sender);
 987                 }
 988         }
 989
 990         public static event RefreshEventHandler Refreshed;
 991
 992         internal static ComponentInfo GetComponentInfo (IComponent com)
 993         {
 994                 lock (componentTable)
 995                 {
 996                         ComponentInfo ci = (ComponentInfo) componentTable [com];
 997                         if (ci == null) {
 998                                 if (onDispose == null)
 999                                         onDispose = new EventHandler (OnComponentDisposed);
1000
1001                                 com.Disposed += onDispose;
1002                                 ci = new ComponentInfo (com);
1003                                 componentTable [com] = ci;
1004                         }
1005                         return ci;
1006                 }
1007         }
1008
1009         internal static TypeInfo GetTypeInfo (Type type)
1010         {
1011                 lock (typeTable)
1012                 {
1013                         TypeInfo ci = (TypeInfo) typeTable [type];
1014                         if (ci == null) {
1015                                 ci = new TypeInfo (type);
1016                                 typeTable [type] = ci;
1017                         }
1018                         return ci;
1019                 }
1020         }
1021
1022         private static Type GetTypeFromName (IComponent component, string typeName)
1023         {
1024                 Type type = null;
1025                 if (component != null && component.Site != null) {
1026                         ITypeResolutionService resver = (ITypeResolutionService) component.Site.GetService (typeof(ITypeResolutionService));
1027                         if (resver != null)
1028                                 type = resver.GetType (typeName);
1029                 }
1030                 if (type == null)
1031                         type = Type.GetType (typeName);
1032                 return type;
1033         }
1034
1035 #if NET_2_0
1036         sealed class AttributeProvider : TypeDescriptionProvider
1037         {
1038                 Attribute[] attributes;
1039
1040                 public AttributeProvider (Attribute[] attributes, TypeDescriptionProvider parent)
1041                         : base (parent)
1042                 {
1043                         this.attributes = attributes;
1044                 }
1045
1046                 public override ICustomTypeDescriptor GetTypeDescriptor (Type type, object instance)
1047                 {
1048                         return new AttributeTypeDescriptor (base.GetTypeDescriptor (type, instance), attributes);
1049                 }
1050
1051                 sealed class AttributeTypeDescriptor : CustomTypeDescriptor
1052                 {
1053                         Attribute[] attributes;
1054
1055                         public AttributeTypeDescriptor (ICustomTypeDescriptor parent, Attribute[] attributes)
1056                                 : base (parent)
1057                         {
1058                                 this.attributes = attributes;
1059                         }
1060
1061                         public override AttributeCollection GetAttributes ()
1062                         {
1063                                 AttributeCollection attrs = base.GetAttributes ();
1064
1065                                 if (attrs != null && attrs.Count > 0)
1066                                         return AttributeCollection.FromExisting (attrs, attributes);
1067                                 else
1068                                         return new AttributeCollection (attributes);
1069                         }
1070                 }
1071         }
1072
1073         sealed class WrappedTypeDescriptionProvider : TypeDescriptionProvider
1074         {
1075                 public TypeDescriptionProvider Wrapped { get; private set; }
1076
1077                 public WrappedTypeDescriptionProvider (TypeDescriptionProvider wrapped)
1078                 {
1079                         Wrapped = wrapped;
1080                 }
1081
1082                 public override object CreateInstance (IServiceProvider provider, Type objectType, Type[] argTypes, object[] args)
1083                 {
1084                         TypeDescriptionProvider wrapped = Wrapped;
1085
1086                         if (wrapped == null)
1087                                 return base.CreateInstance (provider, objectType, argTypes, args);
1088
1089                         return wrapped.CreateInstance (provider, objectType, argTypes, args);
1090                 }
1091
1092                 public override IDictionary GetCache (object instance)
1093                 {
1094                         TypeDescriptionProvider wrapped = Wrapped;
1095
1096                         if (wrapped == null)
1097                                 return base.GetCache (instance);
1098
1099                         return wrapped.GetCache (instance);
1100                 }
1101
1102                 public override ICustomTypeDescriptor GetExtendedTypeDescriptor (object instance)
1103                 {
1104                         return new DefaultTypeDescriptor (this, null, instance);
1105                 }
1106
1107                 public override string GetFullComponentName (object component)
1108                 {
1109                         TypeDescriptionProvider wrapped = Wrapped;
1110
1111                         if (wrapped == null)
1112                                 return base.GetFullComponentName (component);
1113
1114                         return wrapped.GetFullComponentName (component);
1115                 }
1116
1117                 public override Type GetReflectionType (Type type, object instance)
1118                 {
1119                         TypeDescriptionProvider wrapped = Wrapped;
1120
1121                         if (wrapped == null)
1122                                 return base.GetReflectionType (type, instance);
1123
1124                         return wrapped.GetReflectionType (type, instance);
1125                 }
1126
1127                 public override ICustomTypeDescriptor GetTypeDescriptor (Type objectType, object instance)
1128                 {
1129                         TypeDescriptionProvider wrapped = Wrapped;
1130
1131                         if (wrapped == null)
1132                                 return new DefaultTypeDescriptor (this, objectType, instance);
1133
1134                         return wrapped.GetTypeDescriptor (objectType, instance);
1135                 }
1136         }
1137
1138         // TODO: this needs more work
1139         sealed class DefaultTypeDescriptor : CustomTypeDescriptor
1140         {
1141                 TypeDescriptionProvider owner;
1142                 Type objectType;
1143                 object instance;
1144
1145                 public DefaultTypeDescriptor (TypeDescriptionProvider owner, Type objectType, object instance)
1146                 {
1147                         this.owner = owner;
1148                         this.objectType = objectType;
1149                         this.instance = instance;
1150                 }
1151
1152                 public override AttributeCollection GetAttributes ()
1153                 {
1154                         var wrapped = owner as WrappedTypeDescriptionProvider;
1155
1156                         if (wrapped != null)
1157                                 return wrapped.Wrapped.GetTypeDescriptor (objectType, instance).GetAttributes ();
1158
1159                         if (instance != null)
1160                                 return TypeDescriptor.GetAttributes (instance, false);
1161
1162                         if (objectType != null)
1163                                 return TypeDescriptor.GetTypeInfo (objectType).GetAttributes ();
1164
1165                         return base.GetAttributes ();
1166                 }
1167
1168                 public override string GetClassName ()
1169                 {
1170                         var wrapped = owner as WrappedTypeDescriptionProvider;
1171
1172                         if (wrapped != null)
1173                                 return wrapped.Wrapped.GetTypeDescriptor (objectType, instance).GetClassName ();
1174
1175                         return base.GetClassName ();
1176                 }
1177
1178                 public override PropertyDescriptor GetDefaultProperty ()
1179                 {
1180                         var wrapped = owner as WrappedTypeDescriptionProvider;
1181
1182                         if (wrapped != null)
1183                                 return wrapped.Wrapped.GetTypeDescriptor (objectType, instance).GetDefaultProperty ();
1184
1185                         PropertyDescriptor ret;
1186                         if (objectType != null)
1187                                 ret = TypeDescriptor.GetTypeInfo (objectType).GetDefaultProperty ();
1188                         else if (instance != null)
1189                                 ret = TypeDescriptor.GetTypeInfo (instance.GetType ()).GetDefaultProperty ();
1190                         else
1191                                 ret = base.GetDefaultProperty ();
1192
1193                         return ret;
1194                 }
1195
1196                 public override PropertyDescriptorCollection GetProperties ()
1197                 {
1198                         var wrapped = owner as WrappedTypeDescriptionProvider;
1199
1200                         if (wrapped != null)
1201                                 return wrapped.Wrapped.GetTypeDescriptor (objectType, instance).GetProperties ();
1202
1203                         if (instance != null)
1204                                 return TypeDescriptor.GetProperties (instance, null, false);
1205
1206                         if (objectType != null)
1207                                 return TypeDescriptor.GetTypeInfo (objectType).GetProperties (null);
1208
1209                         return base.GetProperties ();
1210                 }
1211         }
1212
1213         sealed class DefaultTypeDescriptionProvider : TypeDescriptionProvider
1214         {
1215                 public DefaultTypeDescriptionProvider ()
1216                 {
1217                 }
1218
1219                 public override ICustomTypeDescriptor GetExtendedTypeDescriptor (object instance)
1220                 {
1221                         return new DefaultTypeDescriptor (this, null, instance);
1222                 }
1223
1224                 public override ICustomTypeDescriptor GetTypeDescriptor (Type objectType, object instance)
1225                 {
1226                         return new DefaultTypeDescriptor (this, objectType, instance);
1227                 }
1228         }
1229 #endif
1230 }
1231
1232         internal abstract class Info
1233         {
1234                 Type _infoType;
1235                 EventDescriptor _defaultEvent;
1236                 bool _gotDefaultEvent;
1237                 PropertyDescriptor _defaultProperty;
1238                 bool _gotDefaultProperty;
1239                 AttributeCollection _attributes;
1240
1241                 public Info (Type infoType)
1242                 {
1243                         _infoType = infoType;
1244                 }
1245
1246                 public abstract AttributeCollection GetAttributes ();
1247                 public abstract EventDescriptorCollection GetEvents ();
1248                 public abstract PropertyDescriptorCollection GetProperties ();
1249
1250                 public Type InfoType
1251                 {
1252                         get { return _infoType; }
1253                 }
1254
1255                 public EventDescriptorCollection GetEvents (Attribute[] attributes)
1256                 {
1257                         EventDescriptorCollection evs = GetEvents ();
1258                         if (attributes == null)
1259                                 return evs;
1260                         else
1261                                 return evs.Filter (attributes);
1262                 }
1263
1264                 public PropertyDescriptorCollection GetProperties (Attribute[] attributes)
1265                 {
1266                         PropertyDescriptorCollection props = GetProperties ();
1267                         if (attributes == null)
1268                                 return props;
1269                         else
1270                                 return props.Filter (attributes);
1271                 }
1272
1273                 public EventDescriptor GetDefaultEvent ()
1274                 {
1275                         if (_gotDefaultEvent)
1276                                 return _defaultEvent;
1277
1278                         DefaultEventAttribute attr = (DefaultEventAttribute) GetAttributes()[typeof(DefaultEventAttribute)];
1279                         if (attr == null || attr.Name == null)
1280                                 _defaultEvent = null;
1281                         else {
1282                                 EventDescriptorCollection events = GetEvents ();
1283                                 _defaultEvent = events [attr.Name];
1284 #if !NET_2_0
1285                                 // In our test case (TypeDescriptorTest.TestGetDefaultEvent), we have
1286                                 // a scenario where a custom filter adds the DefaultEventAttribute,
1287                                 // but its FilterEvents method removes the event the
1288                                 // DefaultEventAttribute applied to.  .NET 1.x accepts this and returns
1289                                 // the *other* event defined in the class.
1290                                 //
1291                                 // Consequently, we know we have a DefaultEvent, but we need to check
1292                                 // and ensure that the requested event is unfiltered.  If it is, just
1293                                 // grab the first element in the collection.
1294                                 if (_defaultEvent == null && events.Count > 0)
1295                                         _defaultEvent = events [0];
1296 #endif
1297                         }
1298                         _gotDefaultEvent = true;
1299                         return _defaultEvent;
1300                 }
1301
1302                 public PropertyDescriptor GetDefaultProperty ()
1303                 {
1304                         if (_gotDefaultProperty)
1305                                 return _defaultProperty;
1306
1307                         DefaultPropertyAttribute attr = (DefaultPropertyAttribute) GetAttributes()[typeof(DefaultPropertyAttribute)];
1308                         if (attr == null || attr.Name == null)
1309                                 _defaultProperty = null;
1310                         else {
1311                                 PropertyDescriptorCollection properties = GetProperties ();
1312                                 _defaultProperty = properties[attr.Name];
1313                         }
1314                         _gotDefaultProperty = true;
1315                         return _defaultProperty;
1316                 }
1317
1318                 protected AttributeCollection GetAttributes (IComponent comp)
1319                 {
1320                         if (_attributes != null)
1321                                 return _attributes;
1322
1323                         bool cache = true;
1324                         ArrayList attributesList = new ArrayList ();
1325
1326                         // 1) Attributes of the type
1327                         foreach (Attribute attribute in _infoType.GetCustomAttributes (false))
1328                                 attributesList.Add (attribute);
1329
1330                         // 2) Attributes of the base types
1331                         Type baseType = _infoType.BaseType;
1332                         while (baseType != null && baseType != typeof (object)) {
1333                                 foreach (Attribute attribute in baseType.GetCustomAttributes (false))
1334                                         attributesList.Add (attribute);
1335                                 baseType = baseType.BaseType;
1336                         }
1337
1338                         // 3) Attributes of the type's implemented interfaces and their interfaces as well
1339                         foreach (Type inface in _infoType.GetInterfaces ())
1340                                 foreach (Attribute attribute in TypeDescriptor.GetAttributes (inface))
1341                                         attributesList.Add (attribute);
1342
1343                         // Filter out duplicate attributes, so that the base types have higher precedence
1344                         // than the interfaces and the type higher than both.
1345                         Hashtable attributesTable = new Hashtable ();
1346                         for (int i = attributesList.Count - 1; i >= 0; i--) {
1347                                 Attribute attribute = (Attribute)attributesList[i];
1348                                 attributesTable[attribute.TypeId] = attribute;
1349                         }
1350
1351                         if (comp != null && comp.Site != null)
1352                         {
1353                                 ITypeDescriptorFilterService filter = (ITypeDescriptorFilterService) comp.Site.GetService (typeof(ITypeDescriptorFilterService));
1354                                 if (filter != null)
1355                                         cache = filter.FilterAttributes (comp, attributesTable);
1356                         }
1357
1358                         Attribute[] attributes = new Attribute[attributesTable.Values.Count];
1359                         attributesTable.Values.CopyTo (attributes, 0);
1360                         AttributeCollection attCol = new AttributeCollection (attributes);
1361                         if (cache)
1362                                 _attributes = attCol;
1363                         return attCol;
1364                 }
1365         }
1366
1367         internal class ComponentInfo : Info
1368         {
1369                 IComponent _component;
1370                 EventDescriptorCollection _events;
1371                 PropertyDescriptorCollection _properties;
1372
1373                 public ComponentInfo (IComponent component): base (component.GetType())
1374                 {
1375                         _component = component;
1376                 }
1377
1378                 public override AttributeCollection GetAttributes ()
1379                 {
1380                         return base.GetAttributes (_component);
1381                 }
1382
1383                 public override EventDescriptorCollection GetEvents ()
1384                 {
1385                         if (_events != null)
1386                                 return _events;
1387
1388                         bool cache = true;
1389                         EventInfo[] events = _component.GetType().GetEvents ();
1390                         Hashtable t = new Hashtable ();
1391                         foreach (EventInfo ev in events)
1392                                 t [ev.Name] = new ReflectionEventDescriptor (ev);
1393
1394                         if (_component.Site != null)
1395                         {
1396                                 ITypeDescriptorFilterService filter = (ITypeDescriptorFilterService) _component.Site.GetService (typeof(ITypeDescriptorFilterService));
1397                                 if (filter != null)
1398                                         cache = filter.FilterEvents (_component, t);
1399                         }
1400
1401                         ArrayList atts = new ArrayList ();
1402                         atts.AddRange (t.Values);
1403                         EventDescriptorCollection attCol = new EventDescriptorCollection (atts);
1404                         if (cache) _events = attCol;
1405                         return attCol;
1406                 }
1407
1408                 public override PropertyDescriptorCollection GetProperties ()
1409                 {
1410                         if (_properties != null)
1411                                 return _properties;
1412
1413                         bool cache = true;
1414                         PropertyInfo[] props = _component.GetType().GetProperties (BindingFlags.Instance | BindingFlags.Public);
1415                         Hashtable t = new Hashtable ();
1416                         for (int i = props.Length-1; i >= 0; i--)
1417                                 t [props[i].Name] = new ReflectionPropertyDescriptor (props[i]);
1418
1419                         if (_component.Site != null)
1420                         {
1421                                 ITypeDescriptorFilterService filter = (ITypeDescriptorFilterService) _component.Site.GetService (typeof(ITypeDescriptorFilterService));
1422                                 if (filter != null)
1423                                         cache = filter.FilterProperties (_component, t);
1424                         }
1425
1426                         PropertyDescriptor[] descriptors = new PropertyDescriptor[t.Values.Count];
1427                         t.Values.CopyTo (descriptors, 0);
1428                         PropertyDescriptorCollection attCol = new PropertyDescriptorCollection (descriptors, true);
1429                         if (cache)
1430                                 _properties = attCol;
1431                         return attCol;
1432                 }
1433         }
1434
1435         internal class TypeInfo : Info
1436         {
1437                 EventDescriptorCollection _events;
1438                 PropertyDescriptorCollection _properties;
1439
1440                 public TypeInfo (Type t): base (t)
1441                 {
1442                 }
1443
1444                 public override AttributeCollection GetAttributes ()
1445                 {
1446                         return base.GetAttributes (null);
1447                 }
1448
1449                 public override EventDescriptorCollection GetEvents ()
1450                 {
1451                         if (_events != null)
1452                                 return _events;
1453
1454                         EventInfo[] events = InfoType.GetEvents ();
1455                         EventDescriptor[] descs = new EventDescriptor [events.Length];
1456                         for (int n=0; n<events.Length; n++)
1457                                 descs [n] = new ReflectionEventDescriptor (events[n]);
1458
1459                         _events = new EventDescriptorCollection (descs);
1460                         return _events;
1461                 }
1462
1463                 public override PropertyDescriptorCollection GetProperties ()
1464                 {
1465                         if (_properties != null)
1466                                 return _properties;
1467
1468                         Hashtable propertiesHash = new Hashtable (); // name - null
1469                         ArrayList propertiesList = new ArrayList (); // propertydescriptors
1470                         Type currentType = InfoType;
1471                         // Getting properties type by type, because in the case of a property in the child type, where
1472                         // the "new" keyword is used and also the return type is changed Type.GetProperties returns
1473                         // also the parent property.
1474                         //
1475                         // Note that we also have to preserve the properties order here.
1476                         //
1477                         while (currentType != null && currentType != typeof (object)) {
1478                                 PropertyInfo[] props = currentType.GetProperties (BindingFlags.Instance | BindingFlags.Public | BindingFlags.DeclaredOnly);
1479                                 foreach (PropertyInfo property in props) {
1480                                         if (property.GetIndexParameters ().Length == 0 &&
1481                                             property.CanRead &&
1482                                             !propertiesHash.ContainsKey (property.Name)) {
1483                                                 propertiesList.Add (new ReflectionPropertyDescriptor (property));
1484                                                 propertiesHash.Add (property.Name, null);
1485                                         }
1486                                 }
1487                                 currentType = currentType.BaseType;
1488                         }
1489
1490                         _properties = new PropertyDescriptorCollection ((PropertyDescriptor[]) propertiesList.ToArray (typeof (PropertyDescriptor)), true);
1491                         return _properties;
1492                 }
1493         }
1494 }