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                 XmlNode node;
  53
  54                 public XPathEditableDocument (XmlNode node)
  55                 {
  56                         this.node = node;
  57                 }
  58
  59                 public XmlNode Node {
  60                         get { return node; }
  61                 }
  62
  63                 public XPathNavigator CreateNavigator ()
  64                 {
  65                         return new XmlDocumentEditableNavigator (this);
  66                 }
  67         }
  68
  69         internal delegate void XmlWriterClosedEventHandler (
  70                 XmlWriter writer);
  71
  72         internal class XmlDocumentInsertionWriter : XmlWriter
  73         {
  74                 XmlNode parent;
  75                 XmlNode current;
  76                 XmlNode nextSibling;
  77                 Stack nodeStack = new Stack ();
  78
  79                 public XmlDocumentInsertionWriter (XmlNode owner, XmlNode nextSibling)
  80                 {
  81                         this.parent = (XmlNode) owner;
  82                         if (parent == null)
  83                                 throw new InvalidOperationException ();
  84                         switch (parent.NodeType) {
  85                         case XmlNodeType.Document:
  86                                 current = ((XmlDocument) parent).CreateDocumentFragment ();
  87                                 break;
  88                         case XmlNodeType.DocumentFragment:
  89                         case XmlNodeType.Element:
  90                                 current = parent.OwnerDocument.CreateDocumentFragment ();
  91                                 break;
  92                         default:
  93                                 throw new InvalidOperationException (String.Format ("Insertion into {0} node is not allowed.", parent.NodeType));
  94                         }
  95                         this.nextSibling = nextSibling;
  96                         state = WriteState.Content;
  97                 }
  98
  99                 WriteState state;
 100                 XmlAttribute attribute;
 101
 102                 public override WriteState WriteState {
 103                         get { return state; }
 104                 }
 105
 106                 public override void Close ()
 107                 {
 108                         while (nodeStack.Count > 0) {
 109                                 XmlNode n = nodeStack.Pop () as XmlNode;
 110                                 n.AppendChild (current);
 111                                 current = n;
 112                         }
 113                         parent.InsertBefore ((XmlDocumentFragment) current, nextSibling);
 114                         if (Closed != null)
 115                                 Closed (this);
 116                 }
 117
 118                 internal event XmlWriterClosedEventHandler Closed;
 119
 120                 internal XmlNode AppendedFirstChild;
 121
 122                 public override void Flush ()
 123                 {
 124                 }
 125
 126                 public override string LookupPrefix (string ns)
 127                 {
 128                         return current.GetPrefixOfNamespace (ns);
 129                 }
 130
 131                 public override void WriteStartAttribute (string prefix, string name, string ns)
 132                 {
 133                         if (state != WriteState.Content)
 134                                 throw new InvalidOperationException ("Current state is not inside element. Cannot start attribute.");
 135                         attribute = current.OwnerDocument.CreateAttribute (prefix, name, ns);
 136                         state = WriteState.Attribute;
 137                 }
 138
 139                 public override void WriteProcessingInstruction (string name, string value)
 140                 {
 141                         XmlProcessingInstruction pi = current.OwnerDocument.CreateProcessingInstruction (name, value);
 142                         current.AppendChild (pi);
 143                 }
 144
 145                 public override void WriteComment (string text)
 146                 {
 147                         XmlComment comment = current.OwnerDocument.CreateComment (text);
 148                         current.AppendChild (comment);
 149                 }
 150
 151                 public override void WriteCData (string text)
 152                 {
 153                         XmlCDataSection cdata = current.OwnerDocument.CreateCDataSection (text);
 154                         current.AppendChild (cdata);
 155                 }
 156
 157                 public override void WriteStartElement (string prefix, string name, string ns)
 158                 {
 159                         XmlElement el = current.OwnerDocument.CreateElement (prefix, name, ns);
 160                         current.AppendChild (el);
 161                         nodeStack.Push (current);
 162                         current = el;
 163                 }
 164
 165                 public override void WriteEndElement ()
 166                 {
 167                         if (nodeStack.Count == 0)
 168                                 throw new InvalidOperationException ("No element is opened.");
 169                         current = nodeStack.Pop () as XmlNode;
 170                 }
 171
 172                 public override void WriteFullEndElement ()
 173                 {
 174                         XmlElement el = current as XmlElement;
 175                         if (el != null)
 176                                 el.IsEmpty = false;
 177                         WriteEndElement ();
 178                 }
 179
 180                 public override void WriteDocType (string name, string pubid, string systemId, string intsubset)
 181                 {
 182                         throw new NotSupportedException ();
 183                 }
 184
 185                 public override void WriteStartDocument ()
 186                 {
 187                         throw new NotSupportedException ();
 188                 }
 189
 190                 public override void WriteStartDocument (bool standalone)
 191                 {
 192                         throw new NotSupportedException ();
 193                 }
 194
 195                 public override void WriteEndDocument ()
 196                 {
 197                         throw new NotSupportedException ();
 198                 }
 199
 200                 public override void WriteBase64 (byte [] data, int start, int length)
 201                 {
 202                         WriteString (Convert.ToBase64String (data, start, length));
 203                 }
 204
 205                 public override void WriteRaw (char [] raw, int start, int length)
 206                 {
 207                         throw new NotSupportedException ();
 208                 }
 209
 210                 public override void WriteRaw (string raw)
 211                 {
 212                         throw new NotSupportedException ();
 213                 }
 214
 215                 public override void WriteSurrogateCharEntity (char msb, char lsb)
 216                 {
 217                         throw new NotSupportedException ();
 218                 }
 219
 220                 public override void WriteCharEntity (char c)
 221                 {
 222                         throw new NotSupportedException ();
 223                 }
 224
 225                 public override void WriteEntityRef (string entname)
 226                 {
 227                         if (state != WriteState.Attribute)
 228                                 throw new InvalidOperationException ("Current state is not inside attribute. Cannot write attribute value.");
 229                         attribute.AppendChild (attribute.OwnerDocument.CreateEntityReference (entname));
 230                 }
 231
 232                 public override void WriteChars (char [] data, int start, int length)
 233                 {
 234                         WriteString (new string (data, start, length));
 235                 }
 236
 237                 public override void WriteString (string text)
 238                 {
 239                         if (attribute != null)
 240                                 attribute.Value += text;
 241                         else {
 242                                 XmlText t = current.OwnerDocument.CreateTextNode (text);
 243                                 current.AppendChild (t);
 244                         }
 245                 }
 246
 247                 public override void WriteWhitespace (string text)
 248                 {
 249                         if (state != WriteState.Attribute)
 250                                 current.AppendChild (current.OwnerDocument.CreateTextNode (text));
 251                         else if (attribute.ChildNodes.Count == 0)
 252                                 attribute.AppendChild (attribute.OwnerDocument.CreateWhitespace (text));
 253                         else
 254                                 attribute.Value += text;
 255                 }
 256
 257                 public override void WriteEndAttribute ()
 258                 {
 259                         XmlElement element = current as XmlElement;
 260                         if (state != WriteState.Attribute || element == null)
 261                                 throw new InvalidOperationException ("Current state is not inside attribute. Cannot close attribute.");
 262                         element.SetAttributeNode (attribute);
 263                         attribute = null;
 264                         state = WriteState.Content;
 265                 }
 266         }
 267
 268         internal class XmlDocumentAttributeWriter : XmlWriter
 269         {
 270                 XmlElement element;
 271
 272                 public XmlDocumentAttributeWriter (XmlNode owner)
 273                 {
 274                         element = owner as XmlElement;
 275                         if (element == null)
 276                                 throw new ArgumentException ("To write attributes, current node must be an element.");
 277                         state = WriteState.Content;
 278                 }
 279
 280                 WriteState state;
 281                 XmlAttribute attribute;
 282
 283                 public override WriteState WriteState {
 284                         get { return state; }
 285                 }
 286
 287                 public override void Close ()
 288                 {
 289                 }
 290
 291                 public override void Flush ()
 292                 {
 293                 }
 294
 295                 public override string LookupPrefix (string ns)
 296                 {
 297                         return element.GetPrefixOfNamespace (ns);
 298                 }
 299
 300                 public override void WriteStartAttribute (string prefix, string name, string ns)
 301                 {
 302                         if (state != WriteState.Content)
 303                                 throw new InvalidOperationException ("Current state is not inside element. Cannot start attribute.");
 304                         attribute = element.OwnerDocument.CreateAttribute (prefix, name, ns);
 305                         state = WriteState.Attribute;
 306                 }
 307
 308                 public override void WriteProcessingInstruction (string name, string value)
 309                 {
 310                         throw new NotSupportedException ();
 311                 }
 312
 313                 public override void WriteComment (string text)
 314                 {
 315                         throw new NotSupportedException ();
 316                 }
 317
 318                 public override void WriteCData (string text)
 319                 {
 320                         throw new NotSupportedException ();
 321                 }
 322
 323                 public override void WriteStartElement (string prefix, string name, string ns)
 324                 {
 325                         throw new NotSupportedException ();
 326                 }
 327
 328                 public override void WriteEndElement ()
 329                 {
 330                         throw new NotSupportedException ();
 331                 }
 332
 333                 public override void WriteFullEndElement ()
 334                 {
 335                         throw new NotSupportedException ();
 336                 }
 337
 338                 public override void WriteDocType (string name, string pubid, string systemId, string intsubset)
 339                 {
 340                         throw new NotSupportedException ();
 341                 }
 342
 343                 public override void WriteStartDocument ()
 344                 {
 345                         throw new NotSupportedException ();
 346                 }
 347
 348                 public override void WriteStartDocument (bool standalone)
 349                 {
 350                         throw new NotSupportedException ();
 351                 }
 352
 353                 public override void WriteEndDocument ()
 354                 {
 355                         throw new NotSupportedException ();
 356                 }
 357
 358                 public override void WriteBase64 (byte [] data, int start, int length)
 359                 {
 360                         throw new NotSupportedException ();
 361                 }
 362
 363                 public override void WriteRaw (char [] raw, int start, int length)
 364                 {
 365                         throw new NotSupportedException ();
 366                 }
 367
 368                 public override void WriteRaw (string raw)
 369                 {
 370                         throw new NotSupportedException ();
 371                 }
 372
 373                 public override void WriteSurrogateCharEntity (char msb, char lsb)
 374                 {
 375                         throw new NotSupportedException ();
 376                 }
 377
 378                 public override void WriteCharEntity (char c)
 379                 {
 380                         throw new NotSupportedException ();
 381                 }
 382
 383                 public override void WriteEntityRef (string entname)
 384                 {
 385                         if (state != WriteState.Attribute)
 386                                 throw new InvalidOperationException ("Current state is not inside attribute. Cannot write attribute value.");
 387                         attribute.AppendChild (attribute.OwnerDocument.CreateEntityReference (entname));
 388                 }
 389
 390                 public override void WriteChars (char [] data, int start, int length)
 391                 {
 392                         WriteString (new string (data, start, length));
 393                 }
 394
 395                 public override void WriteString (string text)
 396                 {
 397                         if (state != WriteState.Attribute)
 398                                 throw new InvalidOperationException ("Current state is not inside attribute. Cannot write attribute value.");
 399                         attribute.Value += text;
 400                 }
 401
 402                 public override void WriteWhitespace (string text)
 403                 {
 404                         if (state != WriteState.Attribute)
 405                                 throw new InvalidOperationException ("Current state is not inside attribute. Cannot write attribute value.");
 406                         if (attribute.ChildNodes.Count == 0)
 407                                 attribute.AppendChild (attribute.OwnerDocument.CreateWhitespace (text));
 408                         else
 409                                 attribute.Value += text;
 410                 }
 411
 412                 public override void WriteEndAttribute ()
 413                 {
 414                         if (state != WriteState.Attribute)
 415                                 throw new InvalidOperationException ("Current state is not inside attribute. Cannot close attribute.");
 416                         element.SetAttributeNode (attribute);
 417                         attribute = null;
 418                         state = WriteState.Content;
 419                 }
 420         }
 421
 422         internal class XmlDocumentEditableNavigator : XPathNavigator, IHasXmlNode
 423         {
 424                 static readonly bool isXmlDocumentNavigatorImpl;
 425
 426                 static XmlDocumentEditableNavigator ()
 427                 {
 428                         isXmlDocumentNavigatorImpl =
 429                                 (typeof (XmlDocumentEditableNavigator).Assembly
 430                                 == typeof (XmlDocument).Assembly);
 431                 }
 432
 433                 XPathEditableDocument document;
 434                 XPathNavigator navigator;
 435
 436                 public XmlDocumentEditableNavigator (XPathEditableDocument doc)
 437                 {
 438                         document = doc;
 439                         if (isXmlDocumentNavigatorImpl)
 440                                 navigator = new XmlDocumentNavigator (doc.Node);
 441                         else
 442                                 navigator = doc.CreateNavigator ();
 443                 }
 444
 445                 public XmlDocumentEditableNavigator (XmlDocumentEditableNavigator nav)
 446                 {
 447                         document = nav.document;
 448                         navigator = nav.navigator.Clone ();
 449                 }
 450
 451                 public override string BaseURI {
 452                         get { return navigator.BaseURI; }
 453                 }
 454
 455                 public override bool IsEmptyElement {
 456                         get { return navigator.IsEmptyElement; }
 457                 }
 458
 459                 public override string LocalName {
 460                         get { return navigator.LocalName; }
 461                 }
 462
 463                 public override XmlNameTable NameTable {
 464                         get { return navigator.NameTable; }
 465                 }
 466
 467                 public override string Name {
 468                         get { return navigator.Name; }
 469                 }
 470
 471                 public override string NamespaceURI {
 472                         get { return navigator.NamespaceURI; }
 473                 }
 474
 475                 public override XPathNodeType NodeType {
 476                         get { return navigator.NodeType; }
 477                 }
 478
 479                 public override string Prefix {
 480                         get { return navigator.Prefix; }
 481                 }
 482
 483                 public override IXmlSchemaInfo SchemaInfo {
 484                         get { return navigator.SchemaInfo; }
 485                 }
 486
 487                 public override object UnderlyingObject {
 488                         get { return navigator.UnderlyingObject; }
 489                 }
 490
 491                 public override string Value {
 492                         get { return navigator.Value; }
 493                 }
 494
 495                 public override XPathNavigator Clone ()
 496                 {
 497                         return new XmlDocumentEditableNavigator (this);
 498                 }
 499
 500                 public override XPathNavigator CreateNavigator ()
 501                 {
 502                         return navigator.Clone ();
 503                 }
 504
 505                 public XmlNode GetNode ()
 506                 {
 507                         return ((IHasXmlNode) navigator).GetNode ();
 508                 }
 509
 510                 public override bool IsSamePosition (XPathNavigator other)
 511                 {
 512                         XmlDocumentEditableNavigator nav = other as XmlDocumentEditableNavigator;
 513                         if (nav != null)
 514                                 return navigator.IsSamePosition (nav.navigator);
 515                         else
 516                                 return navigator.IsSamePosition (nav);
 517                 }
 518
 519                 public override bool MoveTo (XPathNavigator other)
 520                 {
 521                         XmlDocumentEditableNavigator nav = other as XmlDocumentEditableNavigator;
 522                         if (nav != null)
 523                                 return navigator.MoveTo (nav.navigator);
 524                         else
 525                                 return navigator.MoveTo (nav);
 526                 }
 527
 528                 public override bool MoveToFirstAttribute ()
 529                 {
 530                         return navigator.MoveToFirstAttribute ();
 531                 }
 532
 533                 public override bool MoveToFirstChild ()
 534                 {
 535                         return navigator.MoveToFirstChild ();
 536                 }
 537
 538                 public override bool MoveToFirstNamespace (XPathNamespaceScope scope)
 539                 {
 540                         return navigator.MoveToFirstNamespace (scope);
 541                 }
 542
 543                 public override bool MoveToId (string id)
 544                 {
 545                         return navigator.MoveToId (id);
 546                 }
 547
 548                 public override bool MoveToNext ()
 549                 {
 550                         return navigator.MoveToNext ();
 551                 }
 552
 553                 public override bool MoveToNextAttribute ()
 554                 {
 555                         return navigator.MoveToNextAttribute ();
 556                 }
 557
 558                 public override bool MoveToNextNamespace (XPathNamespaceScope scope)
 559                 {
 560                         return navigator.MoveToNextNamespace (scope);
 561                 }
 562
 563                 public override bool MoveToParent ()
 564                 {
 565                         return navigator.MoveToParent ();
 566                 }
 567
 568                 public override bool MoveToPrevious ()
 569                 {
 570                         return navigator.MoveToPrevious ();
 571                 }
 572
 573                 public override XmlWriter AppendChild ()
 574                 {
 575                         XmlNode n = ((IHasXmlNode) navigator).GetNode ();
 576                         if (n == null)
 577                                 throw new InvalidOperationException ("Should not happen.");
 578                         return new XmlDocumentInsertionWriter (n, null);
 579                 }
 580
 581                 public override void DeleteRange (XPathNavigator lastSiblingToDelete)
 582                 {
 583                         if (lastSiblingToDelete == null)
 584                                 throw new ArgumentNullException ();
 585
 586                         XmlNode start = ((IHasXmlNode) navigator).GetNode ();
 587                         XmlNode end = null;
 588                         if (lastSiblingToDelete is IHasXmlNode)
 589                                 end = ((IHasXmlNode) lastSiblingToDelete).GetNode ();
 590                         // After removal, it moves to parent node.
 591                         if (!navigator.MoveToParent ())
 592                                 throw new InvalidOperationException ("There is no parent to remove current node.");
 593
 594                         if (end == null || start.ParentNode != end.ParentNode)
 595                                 throw new InvalidOperationException ("Argument XPathNavigator has different parent node.");
 596
 597                         XmlNode parent = start.ParentNode;
 598                         XmlNode next;
 599                         bool loop = true;
 600                         for (XmlNode n = start; loop; n = next) {
 601                                 loop = n != end;
 602                                 next = n.NextSibling;
 603                                 parent.RemoveChild (n);
 604                         }
 605                 }
 606
 607                 public override XmlWriter ReplaceRange (XPathNavigator nav)
 608                 {
 609                         if (nav == null)
 610                                 throw new ArgumentNullException ();
 611
 612                         XmlNode start = ((IHasXmlNode) navigator).GetNode ();
 613                         XmlNode end = null;
 614                         if (nav is IHasXmlNode)
 615                                 end = ((IHasXmlNode) nav).GetNode ();
 616                         if (end == null || start.ParentNode != end.ParentNode)
 617                                 throw new InvalidOperationException ("Argument XPathNavigator has different parent node.");
 618
 619                         XmlDocumentInsertionWriter w =
 620                                 (XmlDocumentInsertionWriter) InsertBefore ();
 621
 622                         // local variables to anonymous delegate
 623                         XPathNavigator prev = Clone ();
 624                         if (!prev.MoveToPrevious ())
 625                                 prev = null;
 626                         XPathNavigator parentNav = Clone ();
 627                         parentNav.MoveToParent ();
 628
 629                         w.Closed += delegate (XmlWriter writer) {
 630                                 XmlNode parent = start.ParentNode;
 631                                 XmlNode next;
 632                                 bool loop = true;
 633                                 for (XmlNode n = start; loop; n = next) {
 634                                         loop = n != end;
 635                                         next = n.NextSibling;
 636                                         parent.RemoveChild (n);
 637                                 }
 638                                 if (prev != null) {
 639                                         MoveTo (prev);
 640                                         MoveToNext ();
 641                                 } else {
 642                                         MoveTo (parentNav);
 643                                         MoveToFirstChild ();
 644                                 }
 645                         };
 646
 647                         return w;
 648                 }
 649
 650                 public override XmlWriter InsertBefore ()
 651                 {
 652                         XmlNode n = ((IHasXmlNode) navigator).GetNode ();
 653                         return new XmlDocumentInsertionWriter (n.ParentNode, n);
 654                 }
 655
 656                 public override XmlWriter CreateAttributes ()
 657                 {
 658                         XmlNode n = ((IHasXmlNode) navigator).GetNode ();
 659                         return new XmlDocumentAttributeWriter (n);
 660                 }
 661
 662                 public override void DeleteSelf ()
 663                 {
 664                         XmlNode n = ((IHasXmlNode) navigator).GetNode ();
 665                         if (!navigator.MoveToNext ())
 666                                 navigator.MoveToParent ();
 667                         if (n.ParentNode == null)
 668                                 throw new InvalidOperationException ("This node cannot be removed since it has no parent.");
 669                         n.ParentNode.RemoveChild (n);
 670                 }
 671
 672                 public override void ReplaceSelf (XmlReader reader)
 673                 {
 674                         XmlNode n = ((IHasXmlNode) navigator).GetNode ();
 675                         XmlNode p = n.ParentNode;
 676                         if (p == null)
 677                                 throw new InvalidOperationException ("This node cannot be removed since it has no parent.");
 678
 679                         bool movenext = false;
 680                         if (!MoveToPrevious ())
 681                                 MoveToParent ();
 682                         else
 683                                 movenext = true;
 684
 685                         XmlDocument doc = p.NodeType == XmlNodeType.Document ?
 686                                 p as XmlDocument : p.OwnerDocument;
 687                         bool error = false;
 688                         if (reader.ReadState == ReadState.Initial) {
 689                                 reader.Read ();
 690                                 if (reader.EOF)
 691                                         error = true;
 692                                 else
 693                                         while (!reader.EOF)
 694                                                 p.AppendChild (doc.ReadNode (reader));
 695                         } else {
 696                                 if (reader.EOF)
 697                                         error = true;
 698                                 else
 699                                         p.AppendChild (doc.ReadNode (reader));
 700                         }
 701                         if (error)
 702                                 throw new InvalidOperationException ("Content is required in argument XmlReader to replace current node.");
 703
 704                         p.RemoveChild (n);
 705
 706                         if (movenext)
 707                                 MoveToNext ();
 708                         else
 709                                 MoveToFirstChild ();
 710                 }
 711
 712                 public override void SetValue (string value)
 713                 {
 714                         XmlNode n = ((IHasXmlNode) navigator).GetNode ();
 715                         while (n.FirstChild != null)
 716                                 n.RemoveChild (n.FirstChild);
 717                         n.InnerText = value;
 718                 }
 719         }
 720 }
 721
 722 #endif