mcs/class/System.XML/Mono.Xml.XPath/XPathEditableDocument.cs

   1 //
   2 // Mono.Xml.XPath.XPathEditableDocument
   3 //
   4 // Author:
   5 //      Atsushi Enomoto <atsushi@ximian.com>
   6 //
   7 // (C)2004 Novell Inc.
   8 //
   9 // Yet another implementation of editable XPathNavigator.
  10 // (Even runnable under MS.NET 2.0)
  11 //
  12 // By rewriting XPathEditableDocument.CreateNavigator() as just to
  13 // create XmlDocumentNavigator, XmlDocumentEditableNavigator could be used
  14 // as to implement XmlDocument.CreateNavigator().
  15 //
  16
  17 //
  18 // Permission is hereby granted, free of charge, to any person obtaining
  19 // a copy of this software and associated documentation files (the
  20 // "Software"), to deal in the Software without restriction, including
  21 // without limitation the rights to use, copy, modify, merge, publish,
  22 // distribute, sublicense, and/or sell copies of the Software, and to
  23 // permit persons to whom the Software is furnished to do so, subject to
  24 // the following conditions:
  25 //
  26 // The above copyright notice and this permission notice shall be
  27 // included in all copies or substantial portions of the Software.
  28 //
  29 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  30 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  31 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  32 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  33 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  34 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  35 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  36 //
  37 #if NET_2_0
  38
  39 using System;
  40 using System.Collections;
  41 using System.ComponentModel;
  42 using System.IO;
  43 using System.Xml;
  44 using System.Xml.Schema;
  45 using System.Xml.XPath;
  46 using System.Xml.Serialization;
  47
  48 namespace Mono.Xml.XPath
  49 {
  50         internal class XPathEditableDocument : IXPathNavigable
  51         {
  52                 /*
  53                 public static void Main ()
  54                 {
  55                         try {
  56 #if true
  57                                 XmlDocument doc = new XmlDocument ();
  58                                 XPathEditableDocument pd = new XPathEditableDocument (doc);
  59                                 XPathNavigator nav = pd.CreateNavigator ();
  60                                 IChangeTracking xp = pd;
  61 #else
  62                                 XPathDocument doc = new XPathDocument ();
  63                                 XPathNavigator nav = doc.CreateNavigator ();
  64                                 IChangeTracking xp = doc;
  65 #endif
  66                                 doc.LoadXml ("<root/>");
  67                                 nav.MoveToFirstChild (); // root
  68                                 XmlWriter w = nav.AppendChild ();
  69                                 Console.WriteLine (((IChangeTracking) xp).IsChanged);
  70                                 w.WriteElementString ("foo", "foo_text");
  71                                 w.WriteElementString ("bar", "bar_text");
  72                                 w.WriteStartElement ("hoge");
  73                                 w.WriteAttributeString ("fuga", "fugafuga");
  74                                 w.WriteAttributeString ("unya", "unyaunya");
  75                                 w.WriteFullEndElement ();
  76                                 w.Close ();
  77
  78                                 w = nav.CreateAttributes ();
  79                                 w.WriteStartAttribute ("namara");
  80                                 w.WriteString ("mokera");
  81                                 w.WriteEndAttribute ();
  82                                 w.WriteAttributeString ("beccho", "giccho");
  83                                 w.Close ();
  84
  85                                 nav.MoveToRoot ();
  86                                 nav.MoveToFirstChild ();
  87                                 nav.MoveToFirstChild ();
  88                                 nav.DeleteSelf (); // delete foo
  89                                 Console.WriteLine (nav.Name);
  90                                 nav.MoveToNext ();
  91                                 Console.WriteLine (nav.Name);
  92                                 Console.WriteLine (nav.MoveToFirstAttribute ());
  93                                 nav.DeleteSelf (); // delete fuga
  94
  95                                 doc.Save (Console.Out);
  96                         } catch (Exception ex) {
  97                                 Console.WriteLine (ex);
  98                         }
  99                 }
 100                 */
 101
 102                 XmlNode node;
 103
 104                 ArrayList changes = new ArrayList ();
 105
 106                 public XPathEditableDocument (XmlNode node)
 107                 {
 108                         this.node = node;
 109                 }
 110
 111                 public virtual bool CanEdit {
 112                         get { return true; }
 113                 }
 114
 115                 public XmlNode Node {
 116                         get { return node; }
 117                 }
 118
 119                 public XPathNavigator CreateNavigator ()
 120                 {
 121                         return new XmlDocumentEditableNavigator (this);
 122                 }
 123
 124                 public XmlWriter CreateWriter ()
 125                 {
 126                         return CreateNavigator ().AppendChild ();
 127                 }
 128
 129                 public bool HasChanges ()
 130                 {
 131                         return IsChanged;
 132                 }
 133
 134                 #region IRevertibleChangeTracking/IChangeTracking
 135                 public bool IsChanged {
 136                         get { return changes.Count != 0; }
 137                 }
 138
 139                 public void AcceptChanges ()
 140                 {
 141                         changes.Clear ();
 142                 }
 143
 144                 public void RejectChanges ()
 145                 {
 146                         for (int i = changes.Count - 1; i >= 0; i--) {
 147                                 Insertion ins = changes [i] as Insertion;
 148                                 if (ins != null) {
 149                                         ins.ParentNode.RemoveChild (ins.InsertedNode);
 150                                         continue;
 151                                 }
 152
 153                                 Removal rem = changes [i] as Removal;
 154                                 if (rem != null) {
 155                                         if (rem.RemovedNode.NodeType == XmlNodeType.Attribute) {
 156                                                 XmlElement el = (XmlElement) rem.OwnerNode;
 157                                                 el.SetAttributeNode ((XmlAttribute) rem.RemovedNode);
 158                                         }
 159                                         else
 160                                                 rem.OwnerNode.InsertBefore (rem.RemovedNode, rem.NextSibling);
 161                                         continue;
 162                                 }
 163                                 AttributeUpdate au = changes [i] as AttributeUpdate;
 164                                 if (au != null) {
 165                                         if (au.OldAttribute != null)
 166                                                 au.Element.SetAttributeNode (au.OldAttribute);
 167                                         else
 168                                                 au.Element.RemoveAttributeNode (au.NewAttribute);
 169                                         continue;
 170                                 }
 171                         }
 172                         changes.Clear ();
 173                 }
 174                 #endregion
 175
 176                 #region IXmlSerializable
 177                 public void WriteXml (XmlWriter writer)
 178                 {
 179                         throw new NotImplementedException ();
 180                 }
 181
 182                 public void ReadXml (XmlReader reader)
 183                 {
 184                         throw new NotImplementedException ();
 185                 }
 186
 187                 public XmlSchema GetSchema ()
 188                 {
 189                         throw new NotImplementedException ();
 190                 }
 191                 #endregion
 192
 193                 internal bool DeleteNode (XmlNode node)
 194                 {
 195                         Removal rem = new Removal ();
 196                         if (node.NodeType == XmlNodeType.Attribute) {
 197                                 XmlAttribute attr = node as XmlAttribute;
 198                                 rem.OwnerNode = attr.OwnerElement;
 199                                 rem.RemovedNode = node;
 200                                 attr.OwnerElement.RemoveAttributeNode (attr);
 201                                 return false;
 202                         } else {
 203                                 rem.OwnerNode = node.ParentNode;
 204                                 rem.NextSibling = node.NextSibling;
 205                                 rem.RemovedNode = node;
 206                                 node.ParentNode.RemoveChild (node);
 207                                 return rem.NextSibling != null;
 208                         }
 209                 }
 210
 211                 internal XmlWriter CreateInsertionWriter (XmlNode owner, XmlNode previousSibling)
 212                 {
 213                         return new XmlDocumentInsertionWriter (owner, previousSibling, this);
 214                 }
 215
 216                 internal XmlWriter CreateAttributesWriter (XmlNode owner)
 217                 {
 218                         return new XmlDocumentAttributeWriter (owner, this);
 219                 }
 220
 221                 internal void AttributeUpdate (XmlElement element, XmlAttribute oldAttr, XmlAttribute newAttr)
 222                 {
 223                         AttributeUpdate au = new AttributeUpdate ();
 224                         au.Element = element;
 225                         au.OldAttribute = oldAttr;
 226                         au.NewAttribute = newAttr;
 227                         changes.Add (au);
 228                 }
 229
 230                 internal void AppendChild (XmlNode parent, XmlNode child)
 231                 {
 232                         Insertion ins = new Insertion ();
 233                         ins.ParentNode = parent;
 234                         ins.InsertedNode = child;
 235                         changes.Add (ins);
 236                 }
 237         }
 238
 239         internal class XmlDocumentInsertionWriter : XmlWriter
 240         {
 241                 XmlNode current;
 242                 XmlNode previousSibling;
 243                 XPathEditableDocument document;
 244                 Stack nodeStack = new Stack ();
 245
 246                 public XmlDocumentInsertionWriter (XmlNode owner, XmlNode previousSibling, XPathEditableDocument doc)
 247                 {
 248                         this.current = (XmlNode) owner;
 249                         if (current == null)
 250                                 throw new InvalidOperationException ();
 251                         this.previousSibling = previousSibling;
 252                         this.document = doc;
 253                         state = WriteState.Content;
 254                 }
 255
 256                 WriteState state;
 257                 XmlAttribute attribute;
 258
 259                 public override WriteState WriteState {
 260                         get { return state; }
 261                 }
 262
 263                 public override void Close ()
 264                 {
 265                 }
 266
 267                 public override void Flush ()
 268                 {
 269                 }
 270
 271                 public override string LookupPrefix (string ns)
 272                 {
 273                         return current.GetPrefixOfNamespace (ns);
 274                 }
 275
 276                 public override void WriteStartAttribute (string prefix, string name, string ns)
 277                 {
 278                         if (state != WriteState.Content)
 279                                 throw new InvalidOperationException ("Current state is not inside element. Cannot start attribute.");
 280                         attribute = current.OwnerDocument.CreateAttribute (prefix, name, ns);
 281                         state = WriteState.Attribute;
 282                 }
 283
 284                 public override void WriteProcessingInstruction (string name, string value)
 285                 {
 286                         XmlProcessingInstruction pi = current.OwnerDocument.CreateProcessingInstruction (name, value);
 287                         current.AppendChild (pi);
 288                         document.AppendChild (current, pi);
 289                 }
 290
 291                 public override void WriteComment (string text)
 292                 {
 293                         XmlComment comment = current.OwnerDocument.CreateComment (text);
 294                         current.AppendChild (comment);
 295                         document.AppendChild (current, comment);
 296                 }
 297
 298                 public override void WriteCData (string text)
 299                 {
 300                         XmlCDataSection cdata = current.OwnerDocument.CreateCDataSection (text);
 301                         current.AppendChild (cdata);
 302                         document.AppendChild (current, cdata);
 303                 }
 304
 305                 public override void WriteStartElement (string prefix, string name, string ns)
 306                 {
 307                         if (current.OwnerDocument == null)
 308                                 throw new Exception ("Should not happen.");
 309                         XmlElement el = current.OwnerDocument.CreateElement (prefix, name, ns);
 310                         current.AppendChild (el);
 311                         document.AppendChild (current, el);
 312                         nodeStack.Push (current);
 313                         current = el;
 314                 }
 315
 316                 public override void WriteEndElement ()
 317                 {
 318                         if (nodeStack.Count == 0)
 319                                 throw new InvalidOperationException ("No element is opened.");
 320                         current = nodeStack.Pop () as XmlNode;
 321                 }
 322
 323                 public override void WriteFullEndElement ()
 324                 {
 325                         WriteEndElement ();
 326                         XmlElement el = current as XmlElement;
 327                         if (el != null)
 328                                 el.IsEmpty = false;
 329                 }
 330
 331                 public override void WriteDocType (string name, string pubid, string systemId, string intsubset)
 332                 {
 333                         throw new NotSupportedException ();
 334                 }
 335
 336                 public override void WriteStartDocument ()
 337                 {
 338                         throw new NotSupportedException ();
 339                 }
 340
 341                 public override void WriteStartDocument (bool standalone)
 342                 {
 343                         throw new NotSupportedException ();
 344                 }
 345
 346                 public override void WriteEndDocument ()
 347                 {
 348                         throw new NotSupportedException ();
 349                 }
 350
 351                 public override void WriteBase64 (byte [] data, int start, int length)
 352                 {
 353                         WriteString (Convert.ToBase64String (data, start, length));
 354                 }
 355
 356                 public override void WriteRaw (char [] raw, int start, int length)
 357                 {
 358                         throw new NotSupportedException ();
 359                 }
 360
 361                 public override void WriteRaw (string raw)
 362                 {
 363                         throw new NotSupportedException ();
 364                 }
 365
 366                 public override void WriteSurrogateCharEntity (char msb, char lsb)
 367                 {
 368                         throw new NotSupportedException ();
 369                 }
 370
 371                 public override void WriteCharEntity (char c)
 372                 {
 373                         throw new NotSupportedException ();
 374                 }
 375
 376                 public override void WriteEntityRef (string entname)
 377                 {
 378                         if (state != WriteState.Attribute)
 379                                 throw new InvalidOperationException ("Current state is not inside attribute. Cannot write attribute value.");
 380                         attribute.AppendChild (attribute.OwnerDocument.CreateEntityReference (entname));
 381                 }
 382
 383                 public override void WriteChars (char [] data, int start, int length)
 384                 {
 385                         WriteString (new string (data, start, length));
 386                 }
 387
 388                 public override void WriteString (string text)
 389                 {
 390                         if (attribute != null)
 391                                 attribute.Value += text;
 392                         else {
 393                                 XmlText t = current.OwnerDocument.CreateTextNode (text);
 394                                 current.AppendChild (t);
 395                                 document.AppendChild (current, t);
 396                         }
 397                 }
 398
 399                 public override void WriteWhitespace (string text)
 400                 {
 401                         if (state != WriteState.Attribute)
 402                                 current.AppendChild (current.OwnerDocument.CreateTextNode (text));
 403                         else if (attribute.ChildNodes.Count == 0)
 404                                 attribute.AppendChild (attribute.OwnerDocument.CreateWhitespace (text));
 405                         else
 406                                 attribute.Value += text;
 407                 }
 408
 409                 public override void WriteEndAttribute ()
 410                 {
 411                         XmlElement element = current as XmlElement;
 412                         if (state != WriteState.Attribute || element == null)
 413                                 throw new InvalidOperationException ("Current state is not inside attribute. Cannot close attribute.");
 414                         document.AttributeUpdate (element, element.SetAttributeNode (attribute), attribute);
 415                         attribute = null;
 416                         state = WriteState.Content;
 417                 }
 418         }
 419
 420         internal class XmlDocumentAttributeWriter : XmlWriter
 421         {
 422                 XmlElement element;
 423                 XPathEditableDocument document;
 424
 425                 public XmlDocumentAttributeWriter (XmlNode owner, XPathEditableDocument doc)
 426                 {
 427                         element = owner as XmlElement;
 428                         if (element == null)
 429                                 throw new ArgumentException ("To write attributes, current node must be an element.");
 430                         state = WriteState.Content;
 431                         document = doc;
 432                 }
 433
 434                 WriteState state;
 435                 XmlAttribute attribute;
 436
 437                 public override WriteState WriteState {
 438                         get { return state; }
 439                 }
 440
 441                 public override void Close ()
 442                 {
 443                 }
 444
 445                 public override void Flush ()
 446                 {
 447                 }
 448
 449                 public override string LookupPrefix (string ns)
 450                 {
 451                         return element.GetPrefixOfNamespace (ns);
 452                 }
 453
 454                 public override void WriteStartAttribute (string prefix, string name, string ns)
 455                 {
 456                         if (state != WriteState.Content)
 457                                 throw new InvalidOperationException ("Current state is not inside element. Cannot start attribute.");
 458                         attribute = element.OwnerDocument.CreateAttribute (prefix, name, ns);
 459                         state = WriteState.Attribute;
 460                 }
 461
 462                 public override void WriteProcessingInstruction (string name, string value)
 463                 {
 464                         throw new NotSupportedException ();
 465                 }
 466
 467                 public override void WriteComment (string text)
 468                 {
 469                         throw new NotSupportedException ();
 470                 }
 471
 472                 public override void WriteCData (string text)
 473                 {
 474                         throw new NotSupportedException ();
 475                 }
 476
 477                 public override void WriteStartElement (string prefix, string name, string ns)
 478                 {
 479                         throw new NotSupportedException ();
 480                 }
 481
 482                 public override void WriteEndElement ()
 483                 {
 484                         throw new NotSupportedException ();
 485                 }
 486
 487                 public override void WriteFullEndElement ()
 488                 {
 489                         throw new NotSupportedException ();
 490                 }
 491
 492                 public override void WriteDocType (string name, string pubid, string systemId, string intsubset)
 493                 {
 494                         throw new NotSupportedException ();
 495                 }
 496
 497                 public override void WriteStartDocument ()
 498                 {
 499                         throw new NotSupportedException ();
 500                 }
 501
 502                 public override void WriteStartDocument (bool standalone)
 503                 {
 504                         throw new NotSupportedException ();
 505                 }
 506
 507                 public override void WriteEndDocument ()
 508                 {
 509                         throw new NotSupportedException ();
 510                 }
 511
 512                 public override void WriteBase64 (byte [] data, int start, int length)
 513                 {
 514                         throw new NotSupportedException ();
 515                 }
 516
 517                 public override void WriteRaw (char [] raw, int start, int length)
 518                 {
 519                         throw new NotSupportedException ();
 520                 }
 521
 522                 public override void WriteRaw (string raw)
 523                 {
 524                         throw new NotSupportedException ();
 525                 }
 526
 527                 public override void WriteSurrogateCharEntity (char msb, char lsb)
 528                 {
 529                         throw new NotSupportedException ();
 530                 }
 531
 532                 public override void WriteCharEntity (char c)
 533                 {
 534                         throw new NotSupportedException ();
 535                 }
 536
 537                 public override void WriteEntityRef (string entname)
 538                 {
 539                         if (state != WriteState.Attribute)
 540                                 throw new InvalidOperationException ("Current state is not inside attribute. Cannot write attribute value.");
 541                         attribute.AppendChild (attribute.OwnerDocument.CreateEntityReference (entname));
 542                 }
 543
 544                 public override void WriteChars (char [] data, int start, int length)
 545                 {
 546                         WriteString (new string (data, start, length));
 547                 }
 548
 549                 public override void WriteString (string text)
 550                 {
 551                         if (state != WriteState.Attribute)
 552                                 throw new InvalidOperationException ("Current state is not inside attribute. Cannot write attribute value.");
 553                         attribute.Value += text;
 554                 }
 555
 556                 public override void WriteWhitespace (string text)
 557                 {
 558                         if (state != WriteState.Attribute)
 559                                 throw new InvalidOperationException ("Current state is not inside attribute. Cannot write attribute value.");
 560                         if (attribute.ChildNodes.Count == 0)
 561                                 attribute.AppendChild (attribute.OwnerDocument.CreateWhitespace (text));
 562                         else
 563                                 attribute.Value += text;
 564                 }
 565
 566                 public override void WriteEndAttribute ()
 567                 {
 568                         if (state != WriteState.Attribute)
 569                                 throw new InvalidOperationException ("Current state is not inside attribute. Cannot close attribute.");
 570                         document.AttributeUpdate (element, element.SetAttributeNode (attribute), attribute);
 571                         attribute = null;
 572                         state = WriteState.Content;
 573                 }
 574         }
 575
 576         internal class Insertion
 577         {
 578                 // AppendChild : last child / true
 579                 // InsertBefore : current node / false
 580                 // InsertAfter : current node / true
 581                 // PrependChild : first child / false
 582                 public XmlNode ParentNode;
 583                 public XmlNode InsertedNode;
 584                 public bool Afterward;
 585         }
 586
 587         internal class Removal
 588         {
 589                 public XmlNode OwnerNode;
 590                 public XmlNode NextSibling;
 591                 public XmlNode RemovedNode;
 592         }
 593
 594         internal class AttributeUpdate
 595         {
 596                 public XmlElement Element;
 597                 public XmlAttribute NewAttribute;
 598                 public XmlAttribute OldAttribute;
 599         }
 600
 601         internal class XmlDocumentEditableNavigator : XPathNavigator, IHasXmlNode
 602         {
 603                 static readonly bool isXmlDocumentNavigatorImpl;
 604
 605                 static XmlDocumentEditableNavigator ()
 606                 {
 607                         isXmlDocumentNavigatorImpl =
 608                                 (typeof (XmlDocumentEditableNavigator).Assembly
 609                                 == typeof (XmlDocument).Assembly);
 610                 }
 611
 612                 XPathEditableDocument document;
 613                 XPathNavigator navigator;
 614
 615                 public XmlDocumentEditableNavigator (XPathEditableDocument doc)
 616                 {
 617                         document = doc;
 618                         if (isXmlDocumentNavigatorImpl)
 619                                 navigator = new XmlDocumentNavigator (doc.Node);
 620                         else
 621                                 navigator = doc.CreateNavigator ();
 622                 }
 623
 624                 public XmlDocumentEditableNavigator (XmlDocumentEditableNavigator nav)
 625                 {
 626                         document = nav.document;
 627                         navigator = nav.navigator.Clone ();
 628                 }
 629
 630                 public override string BaseURI {
 631                         get { return navigator.BaseURI; }
 632                 }
 633
 634                 public override bool IsEmptyElement {
 635                         get { return navigator.IsEmptyElement; }
 636                 }
 637
 638                 public override string LocalName {
 639                         get { return navigator.LocalName; }
 640                 }
 641
 642                 public override XmlNameTable NameTable {
 643                         get { return navigator.NameTable; }
 644                 }
 645
 646                 public override string Name {
 647                         get { return navigator.Name; }
 648                 }
 649
 650                 public override string NamespaceURI {
 651                         get { return navigator.NamespaceURI; }
 652                 }
 653
 654                 public override XPathNodeType NodeType {
 655                         get { return navigator.NodeType; }
 656                 }
 657
 658                 public override string Prefix {
 659                         get { return navigator.Prefix; }
 660                 }
 661
 662                 public override string Value {
 663                         get { return navigator.Value; }
 664                 }
 665
 666                 public override XPathNavigator Clone ()
 667                 {
 668                         return new XmlDocumentEditableNavigator (this);
 669                 }
 670
 671                 public override XPathNavigator CreateNavigator ()
 672                 {
 673                         return navigator.Clone ();
 674                 }
 675
 676                 public XmlNode GetNode ()
 677                 {
 678                         return ((IHasXmlNode) navigator).GetNode ();
 679                 }
 680
 681                 public override bool IsSamePosition (XPathNavigator other)
 682                 {
 683                         XmlDocumentEditableNavigator nav = other as XmlDocumentEditableNavigator;
 684                         if (nav != null)
 685                                 return navigator.IsSamePosition (nav.navigator);
 686                         else
 687                                 return navigator.IsSamePosition (nav);
 688                 }
 689
 690                 public override bool MoveTo (XPathNavigator other)
 691                 {
 692                         XmlDocumentEditableNavigator nav = other as XmlDocumentEditableNavigator;
 693                         if (nav != null)
 694                                 return navigator.MoveTo (nav.navigator);
 695                         else
 696                                 return navigator.MoveTo (nav);
 697                 }
 698
 699                 public override bool MoveToFirstAttribute ()
 700                 {
 701                         return navigator.MoveToFirstAttribute ();
 702                 }
 703
 704                 public override bool MoveToFirstChild ()
 705                 {
 706                         return navigator.MoveToFirstChild ();
 707                 }
 708
 709                 public override bool MoveToFirstNamespace (XPathNamespaceScope scope)
 710                 {
 711                         return navigator.MoveToFirstNamespace (scope);
 712                 }
 713
 714                 public override bool MoveToId (string id)
 715                 {
 716                         return navigator.MoveToId (id);
 717                 }
 718
 719                 public override bool MoveToNext ()
 720                 {
 721                         return navigator.MoveToNext ();
 722                 }
 723
 724                 public override bool MoveToNextAttribute ()
 725                 {
 726                         return navigator.MoveToNextAttribute ();
 727                 }
 728
 729                 public override bool MoveToNextNamespace (XPathNamespaceScope scope)
 730                 {
 731                         return navigator.MoveToNextNamespace (scope);
 732                 }
 733
 734                 public override bool MoveToParent ()
 735                 {
 736                         return navigator.MoveToParent ();
 737                 }
 738
 739                 public override bool MoveToPrevious ()
 740                 {
 741                         return navigator.MoveToPrevious ();
 742                 }
 743
 744                 public override XmlWriter AppendChild ()
 745                 {
 746                         XmlNode n = ((IHasXmlNode) navigator).GetNode ();
 747                         if (n == null)
 748                                 throw new InvalidOperationException ("Should not happen.");
 749                         return document.CreateInsertionWriter (n, null);
 750                 }
 751
 752                 public override XmlWriter InsertBefore ()
 753                 {
 754                         XmlNode n = ((IHasXmlNode) navigator).GetNode ();
 755                         return document.CreateInsertionWriter (n.ParentNode, n.PreviousSibling);
 756                 }
 757
 758                 public override XmlWriter CreateAttributes ()
 759                 {
 760                         XmlNode n = ((IHasXmlNode) navigator).GetNode ();
 761                         return document.CreateInsertionWriter (n, null);
 762                 }
 763
 764                 public override bool DeleteSelf ()
 765                 {
 766                         XmlNode n = ((IHasXmlNode) navigator).GetNode ();
 767                         if (!navigator.MoveToNext ())
 768                                 navigator.MoveToParent ();
 769                         return document.DeleteNode (n);
 770                 }
 771
 772                 public override void SetValue (string value)
 773                 {
 774                         XmlNode n = ((IHasXmlNode) navigator).GetNode ();
 775                         foreach (XmlNode c in n.ChildNodes)
 776                                 document.DeleteNode (c);
 777                         XmlWriter w = document.CreateInsertionWriter (n, null);
 778                         w.WriteValue (value);
 779                         w.Close ();
 780                 }
 781         }
 782 }
 783
 784 #endif