mcs/class/System.Runtime.Serialization/System.Runtime.Serialization/KnownTypeCollection.cs

   1 //
   2 // KnownTypeCollection.cs
   3 //
   4 // Author:
   5 //      Atsushi Enomoto <atsushi@ximian.com>
   6 //
   7 // Copyright (C) 2005 Novell, Inc.  http://www.novell.com
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28 #if NET_2_0
  29 using System;
  30 using System.Collections;
  31 using System.Collections.Generic;
  32 using System.Collections.ObjectModel;
  33 using System.Linq;
  34 using System.Reflection;
  35 using System.Xml;
  36 using System.Xml.Schema;
  37
  38 using QName = System.Xml.XmlQualifiedName;
  39 using System.Xml.Serialization;
  40
  41 namespace System.Runtime.Serialization
  42 {
  43 /*
  44         XmlFormatter implementation design inference:
  45
  46         type definitions:
  47         - No XML Schema types are directly used. There are some maps from
  48           xs:blahType to ms:blahType where the namespaceURI for prefix "ms" is
  49           "http://schemas.microsoft.com/2003/10/Serialization/" .
  50
  51         serializable types:
  52         - An object being serialized 1) must be of type System.Object, or
  53           2) must be null, or 3) must have either a [DataContract] attribute
  54           or a [Serializable] attribute to be serializable.
  55         - When the object is either of type System.Object or null, then the
  56           XML type is "anyType".
  57         - When the object is [Serializable], then the runtime-serialization
  58           compatible object graph is written.
  59         - Otherwise the serialization is based on contract attributes.
  60           ([Serializable] takes precedence).
  61
  62         type derivation:
  63         - For type A to be serializable, the base type B of A must be
  64           serializable.
  65         - If a type which is [Serializable] and whose base type has a
  66           [DataContract], then for base type members [DataContract] is taken.
  67         - It is vice versa i.e. if the base type is [Serializable] and the
  68           derived type has a [DataContract], then [Serializable] takes place
  69           for base members.
  70
  71         known type collection:
  72         - It internally manages mapping store keyed by contract QNames.
  73           KnownTypeCollection.Add() checks if the same QName contract already
  74           exists (and raises InvalidOperationException if required).
  75
  76 */
  77         internal static class TypeExtensions
  78         {
  79                 public static T GetCustomAttribute<T> (this Type type, bool inherit)
  80                 {
  81                         var arr = type.GetCustomAttributes (typeof (T), inherit);
  82                         return arr != null && arr.Length == 1 ? (T) arr [0] : default (T);
  83                 }
  84         }
  85
  86         internal sealed class KnownTypeCollection : Collection<Type>
  87         {
  88                 internal const string MSSimpleNamespace =
  89                         "http://schemas.microsoft.com/2003/10/Serialization/";
  90                 internal const string MSArraysNamespace =
  91                         "http://schemas.microsoft.com/2003/10/Serialization/Arrays";
  92                 internal const string DefaultClrNamespaceBase =
  93                         "http://schemas.datacontract.org/2004/07/";
  94
  95                 static QName any_type, bool_type,
  96                         byte_type, date_type, decimal_type, double_type,
  97                         float_type, string_type,
  98                         short_type, int_type, long_type,
  99                         ubyte_type, ushort_type, uint_type, ulong_type,
 100                         // non-TypeCode
 101                         any_uri_type, base64_type, duration_type, qname_type,
 102                         // custom in ms nsURI schema
 103                         char_type, guid_type,
 104                         // not in ms nsURI schema
 105                         dbnull_type;
 106
 107                 static KnownTypeCollection ()
 108                 {
 109                         //any_type, bool_type,  byte_type, date_type, decimal_type, double_type,        float_type, string_type,
 110                         // short_type, int_type, long_type,     ubyte_type, ushort_type, uint_type, ulong_type,
 111                         //      any_uri_type, base64_type, duration_type, qname_type,
 112                         //      char_type, guid_type,   dbnull_type;
 113                         string s = MSSimpleNamespace;
 114                         any_type = new QName ("anyType", s);
 115                         any_uri_type = new QName ("anyURI", s);
 116                         bool_type = new QName ("boolean", s);
 117                         base64_type = new QName ("base64Binary", s);
 118                         date_type = new QName ("dateTime", s);
 119                         duration_type = new QName ("duration", s);
 120                         qname_type = new QName ("QName", s);
 121                         decimal_type = new QName ("decimal", s);
 122                         double_type = new QName ("double", s);
 123                         float_type = new QName ("float", s);
 124                         byte_type = new QName ("byte", s);
 125                         short_type = new QName ("short", s);
 126                         int_type = new QName ("int", s);
 127                         long_type = new QName ("long", s);
 128                         ubyte_type = new QName ("unsignedByte", s);
 129                         ushort_type = new QName ("unsignedShort", s);
 130                         uint_type = new QName ("unsignedInt", s);
 131                         ulong_type = new QName ("unsignedLong", s);
 132                         string_type = new QName ("string", s);
 133                         guid_type = new QName ("guid", s);
 134                         char_type = new QName ("char", s);
 135
 136                         dbnull_type = new QName ("DBNull", MSSimpleNamespace + "System");
 137                 }
 138
 139                 // FIXME: find out how QName and guid are processed
 140
 141                 internal QName GetXmlName (Type type)
 142                 {
 143                         SerializationMap map = FindUserMap (type);
 144                         if (map != null)
 145                                 return map.XmlName;
 146                         return GetPredefinedTypeName (type);
 147                 }
 148
 149                 internal static QName GetPredefinedTypeName (Type type)
 150                 {
 151                         QName name = GetPrimitiveTypeName (type);
 152                         if (name != QName.Empty)
 153                                 return name;
 154                         if (type == typeof (DBNull))
 155                                 return dbnull_type;
 156                         return QName.Empty;
 157                 }
 158
 159                 internal static QName GetPrimitiveTypeName (Type type)
 160                 {
 161                         if (type.IsGenericType && type.GetGenericTypeDefinition () == typeof (Nullable<>))
 162                                 return GetPrimitiveTypeName (type.GetGenericArguments () [0]);
 163
 164                         if (type.IsEnum)
 165                                 return QName.Empty;
 166
 167                         switch (Type.GetTypeCode (type)) {
 168                         case TypeCode.Object: // other than System.Object
 169                         case TypeCode.DBNull: // it is natively mapped, but not in ms serialization namespace.
 170                         case TypeCode.Empty:
 171                         default:
 172                                 if (type == typeof (object))
 173                                         return any_type;
 174                                 if (type == typeof (Guid))
 175                                         return guid_type;
 176                                 if (type == typeof (TimeSpan))
 177                                         return duration_type;
 178                                 if (type == typeof (byte []))
 179                                         return base64_type;
 180                                 if (type == typeof (Uri))
 181                                         return any_uri_type;
 182                                 return QName.Empty;
 183                         case TypeCode.Boolean:
 184                                 return bool_type;
 185                         case TypeCode.Byte:
 186                                 return ubyte_type;
 187                         case TypeCode.Char:
 188                                 return char_type;
 189                         case TypeCode.DateTime:
 190                                 return date_type;
 191                         case TypeCode.Decimal:
 192                                 return decimal_type;
 193                         case TypeCode.Double:
 194                                 return double_type;
 195                         case TypeCode.Int16:
 196                                 return short_type;
 197                         case TypeCode.Int32:
 198                                 return int_type;
 199                         case TypeCode.Int64:
 200                                 return long_type;
 201                         case TypeCode.SByte:
 202                                 return byte_type;
 203                         case TypeCode.Single:
 204                                 return float_type;
 205                         case TypeCode.String:
 206                                 return string_type;
 207                         case TypeCode.UInt16:
 208                                 return ushort_type;
 209                         case TypeCode.UInt32:
 210                                 return uint_type;
 211                         case TypeCode.UInt64:
 212                                 return ulong_type;
 213                         }
 214                 }
 215
 216                 internal static string PredefinedTypeObjectToString (object obj)
 217                 {
 218                         Type type = obj.GetType ();
 219                         switch (Type.GetTypeCode (type)) {
 220                         case TypeCode.Object: // other than System.Object
 221                         case TypeCode.Empty:
 222                         default:
 223                                 if (type == typeof (object))
 224                                         return String.Empty;
 225                                 if (type == typeof (Guid))
 226                                         return XmlConvert.ToString ((Guid) obj);
 227                                 if (type == typeof (TimeSpan))
 228                                         return XmlConvert.ToString ((TimeSpan) obj);
 229                                 if (type == typeof (byte []))
 230                                         return Convert.ToBase64String ((byte []) obj);
 231                                 if (type == typeof (Uri))
 232                                         return ((Uri) obj).ToString ();
 233                                 throw new Exception ("Internal error: missing predefined type serialization for type " + type.FullName);
 234                         case TypeCode.DBNull: // predefined, but not primitive
 235                                 return String.Empty;
 236                         case TypeCode.Boolean:
 237                                 return XmlConvert.ToString ((bool) obj);
 238                         case TypeCode.Byte:
 239                                 return XmlConvert.ToString ((int)((byte) obj));
 240                         case TypeCode.Char:
 241                                 return XmlConvert.ToString ((uint) (char) obj);
 242                         case TypeCode.DateTime:
 243                                 return XmlConvert.ToString ((DateTime) obj, XmlDateTimeSerializationMode.RoundtripKind);
 244                         case TypeCode.Decimal:
 245                                 return XmlConvert.ToString ((decimal) obj);
 246                         case TypeCode.Double:
 247                                 return XmlConvert.ToString ((double) obj);
 248                         case TypeCode.Int16:
 249                                 return XmlConvert.ToString ((short) obj);
 250                         case TypeCode.Int32:
 251                                 return XmlConvert.ToString ((int) obj);
 252                         case TypeCode.Int64:
 253                                 return XmlConvert.ToString ((long) obj);
 254                         case TypeCode.SByte:
 255                                 return XmlConvert.ToString ((sbyte) obj);
 256                         case TypeCode.Single:
 257                                 return XmlConvert.ToString ((float) obj);
 258                         case TypeCode.String:
 259                                 return (string) obj;
 260                         case TypeCode.UInt16:
 261                                 return XmlConvert.ToString ((int) (ushort) obj);
 262                         case TypeCode.UInt32:
 263                                 return XmlConvert.ToString ((uint) obj);
 264                         case TypeCode.UInt64:
 265                                 return XmlConvert.ToString ((ulong) obj);
 266                         }
 267                 }
 268
 269                 internal static Type GetPrimitiveTypeFromName (string name)
 270                 {
 271                         switch (name) {
 272                         case "anyURI":
 273                                 return typeof (Uri);
 274                         case "boolean":
 275                                 return typeof (bool);
 276                         case "base64Binary":
 277                                 return typeof (byte []);
 278                         case "dateTime":
 279                                 return typeof (DateTime);
 280                         case "duration":
 281                                 return typeof (TimeSpan);
 282                         case "QName":
 283                                 return typeof (QName);
 284                         case "decimal":
 285                                 return typeof (decimal);
 286                         case "double":
 287                                 return typeof (double);
 288                         case "float":
 289                                 return typeof (float);
 290                         case "byte":
 291                                 return typeof (sbyte);
 292                         case "short":
 293                                 return typeof (short);
 294                         case "int":
 295                                 return typeof (int);
 296                         case "long":
 297                                 return typeof (long);
 298                         case "unsignedByte":
 299                                 return typeof (byte);
 300                         case "unsignedShort":
 301                                 return typeof (ushort);
 302                         case "unsignedInt":
 303                                 return typeof (uint);
 304                         case "unsignedLong":
 305                                 return typeof (ulong);
 306                         case "string":
 307                                 return typeof (string);
 308                         case "anyType":
 309                                 return typeof (object);
 310                         case "guid":
 311                                 return typeof (Guid);
 312                         case "char":
 313                                 return typeof (char);
 314                         default:
 315                                 return null;
 316                         }
 317                 }
 318
 319
 320                 internal static object PredefinedTypeStringToObject (string s,
 321                         string name, XmlReader reader)
 322                 {
 323                         switch (name) {
 324                         case "anyURI":
 325                                 return new Uri(s,UriKind.RelativeOrAbsolute);
 326                         case "boolean":
 327                                 return XmlConvert.ToBoolean (s);
 328                         case "base64Binary":
 329                                 return Convert.FromBase64String (s);
 330                         case "dateTime":
 331                                 return XmlConvert.ToDateTime (s, XmlDateTimeSerializationMode.RoundtripKind);
 332                         case "duration":
 333                                 return XmlConvert.ToTimeSpan (s);
 334                         case "QName":
 335                                 int idx = s.IndexOf (':');
 336                                 string l = idx < 0 ? s : s.Substring (idx + 1);
 337                                 return idx < 0 ? new QName (l) :
 338                                         new QName (l, reader.LookupNamespace (
 339                                                 s.Substring (0, idx)));
 340                         case "decimal":
 341                                 return XmlConvert.ToDecimal (s);
 342                         case "double":
 343                                 return XmlConvert.ToDouble (s);
 344                         case "float":
 345                                 return XmlConvert.ToSingle (s);
 346                         case "byte":
 347                                 return XmlConvert.ToSByte (s);
 348                         case "short":
 349                                 return XmlConvert.ToInt16 (s);
 350                         case "int":
 351                                 return XmlConvert.ToInt32 (s);
 352                         case "long":
 353                                 return XmlConvert.ToInt64 (s);
 354                         case "unsignedByte":
 355                                 return XmlConvert.ToByte (s);
 356                         case "unsignedShort":
 357                                 return XmlConvert.ToUInt16 (s);
 358                         case "unsignedInt":
 359                                 return XmlConvert.ToUInt32 (s);
 360                         case "unsignedLong":
 361                                 return XmlConvert.ToUInt64 (s);
 362                         case "string":
 363                                 return s;
 364                         case "guid":
 365                                 return XmlConvert.ToGuid (s);
 366                         case "anyType":
 367                                 return s;
 368                         case "char":
 369                                 return (char) XmlConvert.ToUInt32 (s);
 370                         default:
 371                                 throw new Exception ("Unanticipated primitive type: " + name);
 372                         }
 373                 }
 374
 375                 List<SerializationMap> contracts = new List<SerializationMap> ();
 376
 377                 public KnownTypeCollection ()
 378                 {
 379                 }
 380
 381                 protected override void ClearItems ()
 382                 {
 383                         base.Clear ();
 384                 }
 385
 386                 protected override void InsertItem (int index, Type type)
 387                 {
 388                         if (TryRegister (type))
 389                                 base.InsertItem (index, type);
 390                 }
 391
 392                 // FIXME: it could remove other types' dependencies.
 393                 protected override void RemoveItem (int index)
 394                 {
 395                         Type t = base [index];
 396                         List<SerializationMap> l = new List<SerializationMap> ();
 397                         foreach (SerializationMap m in contracts) {
 398                                 if (m.RuntimeType == t)
 399                                         l.Add (m);
 400                         }
 401                         foreach (SerializationMap m in l) {
 402                                 contracts.Remove (m);
 403                                 base.RemoveItem (index);
 404                         }
 405                 }
 406
 407                 protected override void SetItem (int index, Type type)
 408                 {
 409                         if (index == Count)
 410                                 InsertItem (index, type);
 411                         else {
 412                                 RemoveItem (index);
 413                                 if (TryRegister (type))
 414                                         base.InsertItem (index - 1, type);
 415                         }
 416                 }
 417
 418                 internal SerializationMap FindUserMap (QName qname)
 419                 {
 420                         for (int i = 0; i < contracts.Count; i++)
 421                                 if (qname == contracts [i].XmlName)
 422                                         return contracts [i];
 423                         return null;
 424                 }
 425
 426                 internal Type GetSerializedType (Type type)
 427                 {
 428                         Type element = GetCollectionElementType (type);
 429                         if (element == null)
 430                                 return type;
 431                         QName name = GetQName (type);
 432                         var map = FindUserMap (name);
 433                         if (map != null)
 434                                 return map.RuntimeType;
 435                         return type;
 436                 }
 437
 438                 internal SerializationMap FindUserMap (Type type)
 439                 {
 440                         for (int i = 0; i < contracts.Count; i++)
 441                                 if (type == contracts [i].RuntimeType)
 442                                         return contracts [i];
 443                         return null;
 444                 }
 445
 446                 internal QName GetQName (Type type)
 447                 {
 448                         if (IsPrimitiveNotEnum (type))
 449                                 return GetPrimitiveTypeName (type);
 450
 451                         SerializationMap map = FindUserMap (type);
 452                         if (map != null)
 453                                 // already mapped.
 454                                 return map.XmlName;
 455
 456                         if (type.IsEnum)
 457                                 return GetEnumQName (type);
 458
 459                         QName qname = GetContractQName (type);
 460                         if (qname != null)
 461                                 return qname;
 462
 463                         if (type.GetInterface ("System.Xml.Serialization.IXmlSerializable") != null)
 464                                 //FIXME: Reusing GetSerializableQName here, since we just
 465                                 //need name of the type..
 466                                 return GetSerializableQName (type);
 467
 468                         qname = GetCollectionContractQName (type);
 469                         if (qname != null)
 470                                 return qname;
 471
 472                         Type element = GetCollectionElementType (type);
 473                         if (element != null)
 474                                 return GetCollectionQName (element);
 475
 476                         if (GetAttribute<SerializableAttribute> (type) != null)
 477                                 return GetSerializableQName (type);
 478
 479                         // FIXME: it needs in-depth check.
 480                         return QName.Empty;
 481                 }
 482
 483                 QName GetContractQName (Type type)
 484                 {
 485                         var a = GetAttribute<DataContractAttribute> (type);
 486                         return a == null ? null : GetContractQName (type, a.Name, a.Namespace);
 487                 }
 488
 489                 QName GetCollectionContractQName (Type type)
 490                 {
 491                         var a = GetAttribute<CollectionDataContractAttribute> (type);
 492                         return a == null ? null : GetContractQName (type, a.Name, a.Namespace);
 493                 }
 494
 495                 internal static QName GetContractQName (Type type, string name, string ns)
 496                 {
 497                         if (name == null) {
 498                                 // FIXME: there could be decent ways to get
 499                                 // the same result...
 500                                 name = type.Namespace == null || type.Namespace.Length == 0 ? type.Name : type.FullName.Substring (type.Namespace.Length + 1).Replace ('+', '.');
 501                                 if (type.IsGenericType) {
 502                                         name = name.Substring (0, name.IndexOf ('`')) + "Of";
 503                                         foreach (var t in type.GetGenericArguments ())
 504                                                 name += t.Name; // FIXME: check namespaces too
 505                                 }
 506                         }
 507                         if (ns == null)
 508                                 ns = DefaultClrNamespaceBase + type.Namespace;
 509                         return new QName (name, ns);
 510                 }
 511
 512                 private QName GetEnumQName (Type type)
 513                 {
 514                         string name = null, ns = null;
 515
 516                         if (!type.IsEnum)
 517                                 return null;
 518
 519                         var dca = GetAttribute<DataContractAttribute> (type);
 520
 521                         if (dca != null) {
 522                                 ns = dca.Namespace;
 523                                 name = dca.Name;
 524                         }
 525
 526                         if (ns == null)
 527                                 ns = DefaultClrNamespaceBase + type.Namespace;
 528
 529                         if (name == null)
 530                                 name = type.Namespace == null ? type.Name : type.FullName.Substring (type.Namespace.Length + 1).Replace ('+', '.');
 531
 532                         return new QName (name, ns);
 533                 }
 534
 535                 private QName GetCollectionQName (Type element)
 536                 {
 537                         QName eqname = GetQName (element);
 538
 539                         string ns = eqname.Namespace;
 540                         if (eqname.Namespace == MSSimpleNamespace)
 541                                 //Arrays of Primitive types
 542                                 ns = MSArraysNamespace;
 543
 544                         return new QName (
 545                                 "ArrayOf" + XmlConvert.EncodeLocalName (eqname.Name),
 546                                 ns);
 547                 }
 548
 549                 private QName GetSerializableQName (Type type)
 550                 {
 551                         string xmlName = type.Name;
 552                         if (type.IsGenericType) {
 553                                 xmlName = xmlName.Substring (0, xmlName.IndexOf ('`')) + "Of";
 554                                 foreach (var t in type.GetGenericArguments ())
 555                                         xmlName += GetQName (t).Name; // FIXME: check namespaces too
 556                         }
 557                         string xmlNamespace = DefaultClrNamespaceBase + type.Namespace;
 558                         var x = GetAttribute<XmlRootAttribute> (type);
 559                         if (x != null) {
 560                                 xmlName = x.ElementName;
 561                                 xmlNamespace = x.Namespace;
 562                         }
 563                         return new QName (XmlConvert.EncodeLocalName (xmlName), xmlNamespace);
 564                 }
 565
 566                 internal bool IsPrimitiveNotEnum (Type type)
 567                 {
 568                         if (type.IsEnum)
 569                                 return false;
 570                         if (Type.GetTypeCode (type) != TypeCode.Object) // explicitly primitive
 571                                 return true;
 572                         if (type == typeof (Guid) || type == typeof (object) || type == typeof(TimeSpan) || type == typeof(byte[]) || type==typeof(Uri)) // special primitives
 573                                 return true;
 574                         // nullable
 575                         if (type.IsGenericType && type.GetGenericTypeDefinition () == typeof (Nullable<>))
 576                                 return IsPrimitiveNotEnum (type.GetGenericArguments () [0]);
 577                         return false;
 578                 }
 579
 580                 internal bool TryRegister (Type type)
 581                 {
 582                         // exclude predefined maps
 583                         if (IsPrimitiveNotEnum (type))
 584                                 return false;
 585
 586                         if (FindUserMap (type) != null)
 587                                 return false;
 588
 589                         if (RegisterEnum (type) != null)
 590                                 return true;
 591
 592                         if (RegisterContract (type) != null)
 593                                 return true;
 594
 595                         if (RegisterIXmlSerializable (type) != null)
 596                                 return true;
 597
 598                         if (RegisterDictionary (type) != null)
 599                                 return true;
 600
 601                         if (RegisterCollectionContract (type) != null)
 602                                 return true;
 603
 604                         if (RegisterCollection (type) != null)
 605                                 return true;
 606
 607                         if (GetAttribute<SerializableAttribute> (type) != null) {
 608                                 RegisterSerializable (type);
 609                                 return true;
 610                         }
 611
 612                         RegisterDefaultTypeMap (type);
 613                         return true;
 614                 }
 615
 616                 internal static Type GetCollectionElementType (Type type)
 617                 {
 618                         if (type.IsArray)
 619                                 return type.GetElementType ();
 620
 621                         Type [] ifaces = type.GetInterfaces ();
 622                         foreach (Type i in ifaces)
 623                                 if (i.IsGenericType && i.GetGenericTypeDefinition ().Equals (typeof (ICollection<>)))
 624                                         return i.GetGenericArguments () [0];
 625                         foreach (Type i in ifaces)
 626                                 if (i == typeof (IList))
 627                                         return typeof (object);
 628                         return null;
 629                 }
 630
 631                 internal T GetAttribute<T> (MemberInfo mi) where T : Attribute
 632                 {
 633                         object [] atts = mi.GetCustomAttributes (typeof (T), false);
 634                         return atts.Length == 0 ? null : (T) atts [0];
 635                 }
 636
 637                 private CollectionContractTypeMap RegisterCollectionContract (Type type)
 638                 {
 639                         var cdca = GetAttribute<CollectionDataContractAttribute> (type);
 640                         if (cdca == null)
 641                                 return null;
 642
 643                         Type element = GetCollectionElementType (type);
 644                         if (element == null)
 645                                 throw new InvalidOperationException (String.Format ("Type '{0}' is marked as collection contract, but it is not a collection", type));
 646
 647                         TryRegister (element); // must be registered before the name conflict check.
 648
 649                         QName qname = GetCollectionContractQName (type);
 650                         CheckStandardQName (qname);
 651                         if (FindUserMap (qname) != null)
 652                                 throw new InvalidOperationException (String.Format ("Failed to add type {0} to known type collection. There already is a registered type for XML name {1}", type, qname));
 653
 654                         var ret = new CollectionContractTypeMap (type, cdca, element, qname, this);
 655                         contracts.Add (ret);
 656                         return ret;
 657                 }
 658
 659                 private CollectionTypeMap RegisterCollection (Type type)
 660                 {
 661                         Type element = GetCollectionElementType (type);
 662                         if (element == null)
 663                                 return null;
 664
 665                         TryRegister (element);
 666
 667                         QName qname = GetCollectionQName (element);
 668
 669                         var map = FindUserMap (qname);
 670                         if (map != null) {
 671                                 var cmap = map as CollectionTypeMap;
 672                                 if (cmap == null || cmap.RuntimeType != type)
 673                                         throw new InvalidOperationException (String.Format ("Failed to add type {0} to known type collection. There already is a registered type for XML name {1}", type, qname));
 674                                 return cmap;
 675                         }
 676
 677                         CollectionTypeMap ret =
 678                                 new CollectionTypeMap (type, element, qname, this);
 679                         contracts.Add (ret);
 680                         return ret;
 681                 }
 682
 683                 static bool TypeImplementsIDictionary (Type type)
 684                 {
 685                         foreach (var iface in type.GetInterfaces ())
 686                                 if (iface == typeof (IDictionary) || (iface.IsGenericType && iface.GetGenericTypeDefinition () == typeof (IDictionary<,>)))
 687                                         return true;
 688
 689                         return false;
 690                 }
 691
 692                 // it also supports contract-based dictionary.
 693                 private DictionaryTypeMap RegisterDictionary (Type type)
 694                 {
 695                         if (!TypeImplementsIDictionary (type))
 696                                 return null;
 697
 698                         var cdca = GetAttribute<CollectionDataContractAttribute> (type);
 699
 700                         DictionaryTypeMap ret =
 701                                 new DictionaryTypeMap (type, cdca, this);
 702
 703                         if (FindUserMap (ret.XmlName) != null)
 704                                 throw new InvalidOperationException (String.Format ("Failed to add type {0} to known type collection. There already is a registered type for XML name {1}", type, ret.XmlName));
 705                         contracts.Add (ret);
 706
 707                         TryRegister (ret.KeyType);
 708                         TryRegister (ret.ValueType);
 709
 710                         return ret;
 711                 }
 712
 713                 private SerializationMap RegisterSerializable (Type type)
 714                 {
 715                         QName qname = GetSerializableQName (type);
 716
 717                         if (FindUserMap (qname) != null)
 718                                 throw new InvalidOperationException (String.Format ("There is already a registered type for XML name {0}", qname));
 719
 720                         SharedTypeMap ret =
 721                                 new SharedTypeMap (type, qname, this);
 722                         contracts.Add (ret);
 723                         return ret;
 724                 }
 725
 726                 private SerializationMap RegisterIXmlSerializable (Type type)
 727                 {
 728                         if (type.GetInterface ("System.Xml.Serialization.IXmlSerializable") == null)
 729                                 return null;
 730
 731                         QName qname = GetSerializableQName (type);
 732
 733                         if (FindUserMap (qname) != null)
 734                                 throw new InvalidOperationException (String.Format ("There is already a registered type for XML name {0}", qname));
 735
 736                         XmlSerializableMap ret = new XmlSerializableMap (type, qname, this);
 737                         contracts.Add (ret);
 738
 739                         return ret;
 740                 }
 741
 742                 void CheckStandardQName (QName qname)
 743                 {
 744                         switch (qname.Namespace) {
 745                         case XmlSchema.Namespace:
 746                         case XmlSchema.InstanceNamespace:
 747                         case MSSimpleNamespace:
 748                         case MSArraysNamespace:
 749                                 throw new InvalidOperationException (String.Format ("Namespace {0} is reserved and cannot be used for user serialization", qname.Namespace));
 750                         }
 751
 752                 }
 753
 754                 private SharedContractMap RegisterContract (Type type)
 755                 {
 756                         QName qname = GetContractQName (type);
 757                         if (qname == null)
 758                                 return null;
 759                         CheckStandardQName (qname);
 760                         if (FindUserMap (qname) != null)
 761                                 throw new InvalidOperationException (String.Format ("There is already a registered type for XML name {0}", qname));
 762
 763                         SharedContractMap ret = new SharedContractMap (type, qname, this);
 764                         contracts.Add (ret);
 765                         ret.Initialize ();
 766
 767                         object [] attrs = type.GetCustomAttributes (typeof (KnownTypeAttribute), true);
 768                         for (int i = 0; i < attrs.Length; i++) {
 769                                 KnownTypeAttribute kt = (KnownTypeAttribute) attrs [i];
 770                                 TryRegister (kt.Type);
 771                         }
 772
 773                         return ret;
 774                 }
 775
 776                 DefaultTypeMap RegisterDefaultTypeMap (Type type)
 777                 {
 778                         DefaultTypeMap ret = new DefaultTypeMap (type, this);
 779                         contracts.Add (ret);
 780                         return ret;
 781                 }
 782
 783                 private EnumMap RegisterEnum (Type type)
 784                 {
 785                         QName qname = GetEnumQName (type);
 786                         if (qname == null)
 787                                 return null;
 788
 789                         if (FindUserMap (qname) != null)
 790                                 throw new InvalidOperationException (String.Format ("There is already a registered type for XML name {0}", qname));
 791
 792                         EnumMap ret =
 793                                 new EnumMap (type, qname, this);
 794                         contracts.Add (ret);
 795                         return ret;
 796                 }
 797         }
 798 }
 799 #endif