mcs/class/System.XML/System.Xml.Serialization/XmlSerializationWriterInterpreter.cs

   1 //
   2 // XmlSerializationWriterInterpreter.cs:
   3 //
   4 // Author:
   5 //   Lluis Sanchez Gual (lluis@ximian.com)
   6 //
   7 // (C) 2002, 2003 Ximian, Inc.  http://www.ximian.com
   8 //
   9
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System;
  32 using System.Text;
  33 using System.Collections;
  34 using System.Reflection;
  35 using System.Xml.Schema;
  36
  37 namespace System.Xml.Serialization
  38 {
  39         internal class XmlSerializationWriterInterpreter: XmlSerializationWriter
  40         {
  41                 XmlMapping _typeMap;
  42                 SerializationFormat _format;
  43                 const string xmlNamespace = "http://www.w3.org/2000/xmlns/";
  44
  45                 public XmlSerializationWriterInterpreter (XmlMapping typeMap)
  46                 {
  47                         _typeMap = typeMap;
  48                         _format = typeMap.Format;
  49                 }
  50
  51                 protected override void InitCallbacks ()
  52                 {
  53                         ArrayList maps = _typeMap.RelatedMaps;
  54                         if (maps != null)
  55                         {
  56                                 foreach (XmlTypeMapping map in maps)  {
  57                                         CallbackInfo info = new CallbackInfo (this, map);
  58                                         if (map.TypeData.SchemaType == SchemaTypes.Enum) AddWriteCallback(map.TypeData.Type, map.XmlType, map.Namespace, new XmlSerializationWriteCallback (info.WriteEnum));
  59                                         else AddWriteCallback(map.TypeData.Type, map.XmlType, map.Namespace, new XmlSerializationWriteCallback (info.WriteObject));
  60                                 }
  61                         }
  62                 }
  63
  64                 public void WriteRoot (object ob)
  65                 {
  66                         WriteStartDocument ();
  67
  68                         if (_typeMap is XmlTypeMapping)
  69                         {
  70                                 XmlTypeMapping mp = (XmlTypeMapping) _typeMap;
  71                                 if (mp.TypeData.SchemaType == SchemaTypes.Class || mp.TypeData.SchemaType == SchemaTypes.Array)
  72                                         TopLevelElement ();
  73
  74                                 if (_format == SerializationFormat.Literal)
  75                                         WriteObject (mp, ob, mp.ElementName, mp.Namespace, true, false, true);
  76                                 else
  77                                         WritePotentiallyReferencingElement (mp.ElementName, mp.Namespace, ob, mp.TypeData.Type, true, false);
  78                         }
  79                         else if (ob is object[])
  80                                 WriteMessage ((XmlMembersMapping)_typeMap, (object[]) ob);
  81                         else
  82                                 throw CreateUnknownTypeException (ob);
  83
  84                         WriteReferencedElements ();
  85                 }
  86
  87                 protected XmlTypeMapping GetTypeMap (Type type)
  88                 {
  89                         ArrayList maps = _typeMap.RelatedMaps;
  90                         if (maps != null)
  91                         {
  92                                 foreach (XmlTypeMapping map in maps)
  93                                         if (map.TypeData.Type == type) return map;
  94                         }
  95                         throw new InvalidOperationException ("Type " + type + " not mapped");
  96                 }
  97
  98                 protected virtual void WriteObject (XmlTypeMapping typeMap, object ob, string element, string namesp, bool isNullable, bool needType, bool writeWrappingElem)
  99                 {
 100                         if (ob == null)
 101                         {
 102                                 if (isNullable)
 103                                 {
 104                                         if (_format == SerializationFormat.Literal) WriteNullTagLiteral(element, namesp);
 105                                         else WriteNullTagEncoded (element, namesp);
 106                                 }
 107                                 return;
 108                         }
 109
 110                         if (ob is XmlNode)
 111                         {
 112                                 if (_format == SerializationFormat.Literal) WriteElementLiteral((XmlNode)ob, "", "", true, typeMap.IsAny);
 113                                 else WriteElementEncoded((XmlNode)ob, "", "", true, typeMap.IsAny);
 114                                 return;
 115                         }
 116
 117                         if (typeMap.TypeData.SchemaType == SchemaTypes.XmlSerializable)
 118                         {
 119                                 WriteSerializable ((IXmlSerializable)ob, element, namesp, isNullable, !typeMap.IsAny);
 120                                 return;
 121                         }
 122
 123                         var obExpectedType = typeMap.TypeData.Type;
 124                         if (!ob.GetType().IsAssignableFrom (obExpectedType))
 125                                 ob = ImplicitConvert (ob, obExpectedType);
 126
 127                         XmlTypeMapping map = typeMap.GetRealTypeMap (ob.GetType());
 128
 129                         if (map == null)
 130                         {
 131                                 // bug #81539
 132                                 if (ob.GetType ().IsArray && typeof (XmlNode).IsAssignableFrom (ob.GetType ().GetElementType ())) {
 133                                         Writer.WriteStartElement (element, namesp);
 134                                         foreach (XmlNode node in (IEnumerable) ob)
 135                                                 node.WriteTo (Writer);
 136                                         Writer.WriteEndElement ();
 137                                 }
 138                                 else
 139                                         WriteTypedPrimitive (element, namesp, ob, true);
 140                                 return;
 141                         }
 142
 143                         if (writeWrappingElem)
 144                         {
 145                                 if (map != typeMap || _format == SerializationFormat.Encoded) needType = true;
 146                                 WriteStartElement (element, namesp, ob);
 147                         }
 148
 149                         if (needType)
 150                                 WriteXsiType(map.XmlType, map.XmlTypeNamespace);
 151
 152                         switch (map.TypeData.SchemaType)
 153                         {
 154                                 case SchemaTypes.Class: WriteObjectElement (map, ob, element, namesp); break;
 155                                 case SchemaTypes.Array: WriteListElement (map, ob, element, namesp); break;
 156                                 case SchemaTypes.Primitive: WritePrimitiveElement (map, ob, element, namesp); break;
 157                                 case SchemaTypes.Enum: WriteEnumElement (map, ob, element, namesp); break;
 158                         }
 159
 160                         if (writeWrappingElem)
 161                                 WriteEndElement (ob);
 162                 }
 163
 164                 protected virtual void WriteMessage (XmlMembersMapping membersMap, object[] parameters)
 165                 {
 166                         if (membersMap.HasWrapperElement) {
 167                                 TopLevelElement ();
 168                                 WriteStartElement(membersMap.ElementName, membersMap.Namespace, (_format == SerializationFormat.Encoded));
 169
 170                                 if (Writer.LookupPrefix (XmlSchema.Namespace) == null)
 171                                         WriteAttribute ("xmlns","xsd",XmlSchema.Namespace,XmlSchema.Namespace);
 172
 173                                 if (Writer.LookupPrefix (XmlSchema.InstanceNamespace) == null)
 174                                         WriteAttribute ("xmlns","xsi",XmlSchema.InstanceNamespace,XmlSchema.InstanceNamespace);
 175                         }
 176
 177                         WriteMembers ((ClassMap)membersMap.ObjectMap, parameters, true);
 178
 179                         if (membersMap.HasWrapperElement)
 180                                 WriteEndElement();
 181                 }
 182
 183                 protected virtual void WriteObjectElement (XmlTypeMapping typeMap, object ob, string element, string namesp)
 184                 {
 185                         ClassMap map = (ClassMap)typeMap.ObjectMap;
 186                         if (map.NamespaceDeclarations != null)
 187                                 WriteNamespaceDeclarations ((XmlSerializerNamespaces) map.NamespaceDeclarations.GetValue (ob));
 188
 189                         WriteObjectElementAttributes (typeMap, ob);
 190                         WriteObjectElementElements (typeMap, ob);
 191                 }
 192
 193                 protected virtual void WriteObjectElementAttributes (XmlTypeMapping typeMap, object ob)
 194                 {
 195                         ClassMap map = (ClassMap)typeMap.ObjectMap;
 196                         WriteAttributeMembers (map, ob, false);
 197                 }
 198
 199                 protected virtual void WriteObjectElementElements (XmlTypeMapping typeMap, object ob)
 200                 {
 201                         ClassMap map = (ClassMap)typeMap.ObjectMap;
 202                         WriteElementMembers (map, ob, false);
 203                 }
 204
 205                 void WriteMembers (ClassMap map, object ob, bool isValueList)
 206                 {
 207                         WriteAttributeMembers (map, ob, isValueList);
 208                         WriteElementMembers (map, ob, isValueList);
 209                 }
 210
 211                 void WriteAttributeMembers (ClassMap map, object ob, bool isValueList)
 212                 {
 213                         // Write attributes
 214
 215                         XmlTypeMapMember anyAttrMember = map.DefaultAnyAttributeMember;
 216                         if (anyAttrMember != null && MemberHasValue (anyAttrMember, ob, isValueList))
 217                         {
 218                                 ICollection extraAtts = (ICollection) GetMemberValue (anyAttrMember, ob, isValueList);
 219                                 if (extraAtts != null)
 220                                 {
 221                                         foreach (XmlAttribute attr in extraAtts)
 222                                                 if (attr.NamespaceURI != xmlNamespace)
 223                                                         WriteXmlAttribute (attr, ob);
 224                                 }
 225                         }
 226
 227                         ICollection attributes = map.AttributeMembers;
 228                         if (attributes != null)
 229                         {
 230                                 foreach (XmlTypeMapMemberAttribute attr in attributes) {
 231                                         if (MemberHasValue (attr, ob, isValueList))
 232                                                 WriteAttribute (attr.AttributeName, attr.Namespace, GetStringValue (attr.MappedType, attr.TypeData, GetMemberValue (attr, ob, isValueList)));
 233                                 }
 234                         }
 235                 }
 236
 237                 void WriteElementMembers (ClassMap map, object ob, bool isValueList)
 238                 {
 239                         ICollection members = map.ElementMembers;
 240                         if (members != null)
 241                         {
 242                                 foreach (XmlTypeMapMemberElement member in members)
 243                                 {
 244                                         if (!MemberHasValue (member, ob, isValueList)) continue;
 245                                         object memberValue = GetMemberValue (member, ob, isValueList);
 246                                         Type memType = member.GetType();
 247
 248                                         if (memType == typeof(XmlTypeMapMemberList))
 249                                         {
 250                                                 WriteMemberElement ((XmlTypeMapElementInfo) member.ElementInfo[0], memberValue);
 251                                         }
 252                                         else if (memType == typeof(XmlTypeMapMemberFlatList))
 253                                         {
 254                                                 if (memberValue != null)
 255                                                         WriteListContent (ob, member.TypeData, ((XmlTypeMapMemberFlatList)member).ListMap, memberValue, null);
 256                                         }
 257                                         else if (memType == typeof(XmlTypeMapMemberAnyElement))
 258                                         {
 259                                                 if (memberValue != null)
 260                                                         WriteAnyElementContent ((XmlTypeMapMemberAnyElement)member, memberValue);
 261                                         }
 262                                         else if (memType == typeof(XmlTypeMapMemberAnyAttribute))
 263                                         {
 264                                                 // Ignore
 265                                         }
 266                                         else if (memType == typeof(XmlTypeMapMemberElement))
 267                                         {
 268                                                 XmlTypeMapElementInfo elem = member.FindElement (ob, memberValue);
 269                                                 WriteMemberElement (elem, memberValue);
 270                                         }
 271                                         else
 272                                                 throw new InvalidOperationException ("Unknown member type");
 273                                 }
 274                         }
 275                 }
 276
 277                 object GetMemberValue (XmlTypeMapMember member, object ob, bool isValueList)
 278                 {
 279                         if (isValueList) return ((object[])ob)[member.GlobalIndex];
 280                         else return member.GetValue (ob);
 281                 }
 282
 283                 bool MemberHasValue (XmlTypeMapMember member, object ob, bool isValueList)
 284                 {
 285                         if (isValueList) {
 286                                 if (member.IsOptionalValueType && !member.GetValueSpecified (ob))
 287                                         return false;
 288                                 return member.GlobalIndex < ((object[])ob).Length;
 289                         }
 290                         else if (member.DefaultValue != System.DBNull.Value) {
 291                                 object val = GetMemberValue (member, ob, isValueList);
 292                                 if (val == null && member.DefaultValue == null) return false;
 293                                 if (val != null && val.GetType().IsEnum)
 294                                 {
 295                                         if (val.Equals (member.DefaultValue)) return false;
 296                                         Type t = Enum.GetUnderlyingType(val.GetType());
 297                                         val = Convert.ChangeType (val, t, null);
 298                                 }
 299                                 if (val != null && val.Equals (member.DefaultValue)) return false;
 300                         }
 301                         else if (member.IsOptionalValueType)
 302                                 return member.GetValueSpecified (ob);
 303
 304                         return true;
 305                 }
 306
 307                 void WriteMemberElement (XmlTypeMapElementInfo elem, object memberValue)
 308                 {
 309                         switch (elem.TypeData.SchemaType)
 310                         {
 311                                 case SchemaTypes.XmlNode:
 312                                         string elemName = elem.WrappedElement ? elem.ElementName : "";
 313                                         if (_format == SerializationFormat.Literal) WriteElementLiteral(((XmlNode)memberValue), elemName, elem.Namespace, elem.IsNullable, false);
 314                                         else WriteElementEncoded(((XmlNode)memberValue), elemName, elem.Namespace, elem.IsNullable, false);
 315                                         break;
 316
 317                                 case SchemaTypes.Enum:
 318                                 case SchemaTypes.Primitive:
 319                                         if (_format == SerializationFormat.Literal)
 320                                                 WritePrimitiveValueLiteral (memberValue, elem.ElementName, elem.Namespace, elem.MappedType, elem.TypeData, elem.WrappedElement, elem.IsNullable);
 321                                         else
 322                                                 WritePrimitiveValueEncoded (memberValue, elem.ElementName, elem.Namespace, new XmlQualifiedName (elem.DataTypeName, elem.DataTypeNamespace), elem.MappedType, elem.TypeData, elem.WrappedElement, elem.IsNullable);
 323                                         break;
 324
 325                                 case SchemaTypes.Array:
 326                                         if (memberValue == null) {
 327                                                 if (!elem.IsNullable) return;
 328                                                 if (_format == SerializationFormat.Literal) WriteNullTagLiteral (elem.ElementName, elem.Namespace);
 329                                                 else WriteNullTagEncoded (elem.ElementName, elem.Namespace);
 330                                         }
 331                                         else if (elem.MappedType.MultiReferenceType)
 332                                                 WriteReferencingElement (elem.ElementName, elem.Namespace, memberValue, elem.IsNullable);
 333                                         else {
 334                                                 WriteStartElement(elem.ElementName, elem.Namespace, memberValue);
 335                                                 WriteListContent (null, elem.TypeData, (ListMap) elem.MappedType.ObjectMap, memberValue, null);
 336                                                 WriteEndElement (memberValue);
 337                                         }
 338                                         break;
 339
 340                                 case SchemaTypes.Class:
 341                                         if (elem.MappedType.MultiReferenceType) {
 342                                                 if (elem.MappedType.TypeData.Type == typeof(object))
 343                                                         WritePotentiallyReferencingElement (elem.ElementName, elem.Namespace, memberValue, null, false, elem.IsNullable);
 344                                                 else
 345                                                         WriteReferencingElement (elem.ElementName, elem.Namespace, memberValue, elem.IsNullable);
 346                                         }
 347                                         else WriteObject (elem.MappedType, memberValue, elem.ElementName, elem.Namespace, elem.IsNullable, false, true);
 348                                         break;
 349
 350                                 case SchemaTypes.XmlSerializable:
 351                                         // bug #419973
 352                                         if (!elem.MappedType.TypeData.Type.IsInstanceOfType (memberValue))
 353                                                 memberValue = ImplicitConvert (memberValue, elem.MappedType.TypeData.Type);
 354                                         WriteSerializable ((IXmlSerializable) memberValue, elem.ElementName, elem.Namespace, elem.IsNullable);
 355                                         break;
 356
 357                                 default:
 358                                         throw new NotSupportedException ("Invalid value type");
 359                         }
 360                 }
 361
 362                 internal static object ImplicitConvert (object obj, Type type)
 363                 {
 364                         if (obj == null)
 365                                 return null;
 366
 367                         for (Type t = obj.GetType (); t != typeof (object); t = t.BaseType) {
 368                                 MethodInfo mi = t.GetMethod ("op_Implicit", new Type [] {t});
 369                                 if (mi != null && mi.ReturnType == type)
 370                                         return mi.Invoke (null, new object [] {obj});
 371
 372                                 mi = type.GetMethod ("op_Implicit", new Type [] {t});
 373                                 if (mi != null && mi.ReturnType == type)
 374                                         return mi.Invoke (null, new object [] {obj});
 375                         }
 376                         return obj;
 377                 }
 378
 379                 void WritePrimitiveValueLiteral (object memberValue, string name, string ns, XmlTypeMapping mappedType, TypeData typeData, bool wrapped, bool isNullable)
 380                 {
 381                         if (!wrapped) {
 382                                 WriteValue (GetStringValue (mappedType, typeData, memberValue));
 383                         }
 384                         else if (isNullable) {
 385                                 if (typeData.Type == typeof(XmlQualifiedName)) WriteNullableQualifiedNameLiteral (name, ns, (XmlQualifiedName)memberValue);
 386                                 else WriteNullableStringLiteral (name, ns, GetStringValue (mappedType, typeData, memberValue));
 387                         }
 388                         else {
 389                                 if (typeData.Type == typeof(XmlQualifiedName)) WriteElementQualifiedName (name, ns, (XmlQualifiedName)memberValue);
 390                                 else WriteElementString (name, ns, GetStringValue (mappedType, typeData, memberValue));
 391                         }
 392                 }
 393
 394                 void WritePrimitiveValueEncoded (object memberValue, string name, string ns, XmlQualifiedName xsiType, XmlTypeMapping mappedType, TypeData typeData, bool wrapped, bool isNullable)
 395                 {
 396                         if (!wrapped) {
 397                                 WriteValue (GetStringValue (mappedType, typeData, memberValue));
 398                         }
 399                         else if (isNullable) {
 400                                 if (typeData.Type == typeof(XmlQualifiedName)) WriteNullableQualifiedNameEncoded (name, ns, (XmlQualifiedName)memberValue, xsiType);
 401                                 else WriteNullableStringEncoded (name, ns, GetStringValue (mappedType, typeData, memberValue), xsiType);
 402                         }
 403                         else {
 404                                 if (typeData.Type == typeof(XmlQualifiedName)) WriteElementQualifiedName (name, ns, (XmlQualifiedName)memberValue, xsiType);
 405                                 else WriteElementString (name, ns, GetStringValue (mappedType, typeData, memberValue), xsiType);
 406                         }
 407                 }
 408
 409                 protected virtual void WriteListElement (XmlTypeMapping typeMap, object ob, string element, string namesp)
 410                 {
 411                         if (_format == SerializationFormat.Encoded)
 412                         {
 413                                 string n, ns;
 414                                 int itemCount = GetListCount (typeMap.TypeData, ob);
 415                                 ((ListMap) typeMap.ObjectMap).GetArrayType (itemCount, out n, out ns);
 416                                 string arrayType = (ns != string.Empty) ? FromXmlQualifiedName (new XmlQualifiedName(n,ns)) : n;
 417                                 WriteAttribute ("arrayType", XmlSerializer.EncodingNamespace, arrayType);
 418                         }
 419                         WriteListContent (null, typeMap.TypeData, (ListMap) typeMap.ObjectMap, ob, null);
 420                 }
 421
 422                 void WriteListContent (object container, TypeData listType, ListMap map, object ob, StringBuilder targetString)
 423                 {
 424                         if (listType.Type.IsArray)
 425                         {
 426                                 Array array = (Array)ob;
 427                                 for (int n=0; n<array.Length; n++)
 428                                 {
 429                                         object item = array.GetValue (n);
 430                                         XmlTypeMapElementInfo info = map.FindElement (container, n, item);
 431                                         if (info != null && targetString == null) WriteMemberElement (info, item);
 432                                         else if (info != null && targetString != null) targetString.Append (GetStringValue (info.MappedType, info.TypeData, item)).Append (" ");
 433                                         else if (item != null) throw CreateUnknownTypeException (item);
 434                                 }
 435                         }
 436                         else if (ob is ICollection)
 437                         {
 438                                 int count = (int) ob.GetType().GetProperty ("Count").GetValue(ob,null);
 439                                 PropertyInfo itemProp = TypeData.GetIndexerProperty (listType.Type);
 440                                 object[] index = new object[1];
 441                                 for (int n=0; n<count; n++)
 442                                 {
 443                                         index[0] = n;
 444                                         object item = itemProp.GetValue (ob, index);
 445                                         XmlTypeMapElementInfo info = map.FindElement (container, n, item);
 446                                         if (info != null && targetString == null) WriteMemberElement (info, item);
 447                                         else if (info != null && targetString != null) targetString.Append (GetStringValue (info.MappedType, info.TypeData, item)).Append (" ");
 448                                         else if (item != null) throw CreateUnknownTypeException (item);
 449                                 }
 450                         }
 451                         else if (ob is IEnumerable)
 452                         {
 453                                 IEnumerable e = (IEnumerable)ob;
 454                                 foreach (object item in e)
 455                                 {
 456                                         XmlTypeMapElementInfo info = map.FindElement (container, -1, item);
 457                                         if (info != null && targetString == null) WriteMemberElement (info, item);
 458                                         else if (info != null && targetString != null) targetString.Append (GetStringValue (info.MappedType, info.TypeData, item)).Append (" ");
 459                                         else if (item != null) throw CreateUnknownTypeException (item);
 460                                 }
 461                         }
 462                         else
 463                                 throw new Exception ("Unsupported collection type");
 464                 }
 465
 466                 int GetListCount (TypeData listType, object ob)
 467                 {
 468                         if (listType.Type.IsArray)
 469                                 return ((Array)ob).Length;
 470                         else
 471                                 return (int) listType.Type.GetProperty ("Count").GetValue(ob,null);
 472                 }
 473
 474                 void WriteAnyElementContent (XmlTypeMapMemberAnyElement member, object memberValue)
 475                 {
 476                         //
 477                         // XmlAnyElement can be of XmlElement or XmlNode type
 478                         //
 479                         if (member.TypeData.Type == typeof (XmlElement) || member.TypeData.Type == typeof(XmlNode)) {
 480                                 memberValue = new object[] { memberValue };
 481                         }
 482
 483                         Array elems = (Array) memberValue;
 484                         foreach (var elem_ in elems)
 485                         {
 486                                 XmlNode elem = elem_ as XmlNode;
 487                                 if (elem == null)
 488                                         throw new InvalidOperationException (String.Format ("XmlAnyElementAttribute can only be applied to members of type XmlElement, XmlElement[] or XmlNode[]. The target object is {0}", elem_ != null ? elem_.GetType () : null));
 489                                 if (elem is XmlElement)
 490                                 {
 491                                         if (member.IsElementDefined (elem.Name, elem.NamespaceURI))
 492                                         {
 493                                                 if (_format == SerializationFormat.Literal) WriteElementLiteral (elem, "", "", false, true);
 494                                                 else WriteElementEncoded (elem, "", "", false, true);
 495                                         }
 496                                         else
 497                                                 throw CreateUnknownAnyElementException (elem.Name, elem.NamespaceURI);
 498                                 }
 499                                 else
 500                                         elem.WriteTo (Writer);
 501                         }
 502                 }
 503
 504                 protected virtual void WritePrimitiveElement (XmlTypeMapping typeMap, object ob, string element, string namesp)
 505                 {
 506                         Writer.WriteString (GetStringValue (typeMap, typeMap.TypeData, ob));
 507                 }
 508
 509                 protected virtual void WriteEnumElement (XmlTypeMapping typeMap, object ob, string element, string namesp)
 510                 {
 511                         Writer.WriteString (GetEnumXmlValue (typeMap, ob));
 512                 }
 513
 514                 string GetStringValue (XmlTypeMapping typeMap, TypeData type, object value)
 515                 {
 516                         if (type.SchemaType == SchemaTypes.Array) {
 517                                 if (value == null) return null;
 518                                 StringBuilder sb = new StringBuilder ();
 519                                 WriteListContent (null, typeMap.TypeData, (ListMap)typeMap.ObjectMap, value, sb);
 520                                 return sb.ToString ().Trim ();
 521                         }
 522                         else if (type.SchemaType == SchemaTypes.Enum)
 523                                 return GetEnumXmlValue (typeMap, value);
 524                         else if (type.Type == typeof (XmlQualifiedName))
 525                                 return FromXmlQualifiedName ((XmlQualifiedName)value);
 526                         else if (value == null)
 527                                 return null;
 528                         else
 529                                 return XmlCustomFormatter.ToXmlString (type, value);
 530                 }
 531
 532                 string GetEnumXmlValue (XmlTypeMapping typeMap, object ob)
 533                 {
 534                         if (ob == null)
 535                                 return null;
 536                         EnumMap map = (EnumMap)typeMap.ObjectMap;
 537                         return map.GetXmlName (typeMap.TypeFullName, ob);
 538                 }
 539
 540                 class CallbackInfo
 541                 {
 542                         XmlSerializationWriterInterpreter _swi;
 543                         XmlTypeMapping _typeMap;
 544
 545                         public CallbackInfo (XmlSerializationWriterInterpreter swi, XmlTypeMapping typeMap)
 546                         {
 547                                 _swi = swi;
 548                                 _typeMap = typeMap;
 549                         }
 550
 551                         internal void WriteObject (object ob)
 552                         {
 553                                 _swi.WriteObject (_typeMap, ob, _typeMap.ElementName, _typeMap.Namespace, false, false, false);
 554                         }
 555
 556                         internal void WriteEnum (object ob)
 557                         {
 558                                 _swi.WriteObject (_typeMap, ob, _typeMap.ElementName, _typeMap.Namespace, false, true, false);
 559                         }
 560                 }
 561
 562         }
 563 }