mcs/class/System.Data/System.Data/DataSet.cs

   1 //
   2 // System.Data/DataSet.cs
   3 //
   4 // Author:
   5 //   Christopher Podurgiel <cpodurgiel@msn.com>
   6 //   Daniel Morgan <danmorg@sc.rr.com>
   7 //   Rodrigo Moya <rodrigo@ximian.com>
   8 //   Stuart Caborn <stuart.caborn@virgin.net>
   9 //   Tim Coleman (tim@timcoleman.com)
  10 //   Ville Palo <vi64pa@koti.soon.fi>
  11 //
  12 // (C) Ximian, Inc. 2002
  13 // Copyright (C) Tim Coleman, 2002
  14 //
  15
  16 using System;
  17 using System.Collections;
  18 using System.ComponentModel;
  19 using System.Globalization;
  20 using System.Threading;
  21 using System.IO;
  22 using System.Runtime.Serialization;
  23 using System.Xml;
  24 using System.Xml.Schema;
  25
  26 namespace System.Data {
  27         /// <summary>
  28         /// an in-memory cache of data
  29         /// </summary>
  30         //[Designer]
  31         [ToolboxItem (false)]
  32         [DefaultProperty ("DataSetName")]
  33         [Serializable]
  34         public class DataSet : MarshalByValueComponent, IListSource,
  35                 ISupportInitialize, ISerializable {
  36                 private string dataSetName;
  37                 private string _namespace = "";
  38                 private string prefix;
  39                 private bool caseSensitive;
  40                 private bool enforceConstraints = true;
  41                 private DataTableCollection tableCollection;
  42                 private DataRelationCollection relationCollection;
  43                 private PropertyCollection properties;
  44                 private DataViewManager defaultView;
  45                 private CultureInfo locale;
  46
  47                 #region Constructors
  48
  49                 public DataSet() : this ("NewDataSet") {
  50                 }
  51
  52                 public DataSet(string name) {
  53                         dataSetName = name;
  54                         tableCollection = new DataTableCollection (this);
  55                         relationCollection = new DataRelationCollection.DataSetRelationCollection (this);
  56                         properties = new PropertyCollection();
  57                 }
  58
  59                 [MonoTODO]
  60                 protected DataSet(SerializationInfo info, StreamingContext context) : this () {
  61                         throw new NotImplementedException ();
  62                 }
  63
  64                 #endregion // Constructors
  65
  66                 #region Public Properties
  67
  68                 [DataCategory ("Data")]
  69                 [DataSysDescription ("Indicates whether comparing strings within the DataSet is case sensitive.")]
  70                 [DefaultValue (false)]
  71                 public bool CaseSensitive {
  72                         get { return caseSensitive; }
  73                         set {
  74                                 foreach (DataTable T in Tables) {
  75                                         if (T.VirginCaseSensitive)
  76                                                 T.CaseSensitive = value;
  77                                 }
  78
  79                                 caseSensitive = value;
  80                         }
  81                 }
  82
  83                 [DataCategory ("Data")]
  84                 [DataSysDescription ("The name of this DataSet.")]
  85                 [DefaultValue ("")]
  86                 public string DataSetName {
  87                         get { return dataSetName; }
  88                         set { dataSetName = value; }
  89                 }
  90
  91                 [DataSysDescription ("Indicates a custom \"view\" of the data contained by the DataSet. This view allows filtering, searching, and navigating through the custom data view.")]
  92                 [Browsable (false)]
  93                 public DataViewManager DefaultViewManager {
  94                         get {
  95                                 if (defaultView == null)
  96                                         defaultView = new DataViewManager (this);
  97                                 return defaultView;
  98                         }
  99                 }
 100
 101                 [DataSysDescription ("Indicates whether constraint rules are to be followed.")]
 102                 [DefaultValue (true)]
 103                 public bool EnforceConstraints {
 104                         get { return enforceConstraints; }
 105                         set { enforceConstraints = value; }
 106                 }
 107
 108                 [Browsable (false)]
 109                 [DataCategory ("Data")]
 110                 [DataSysDescription ("The collection that holds custom user information.")]
 111                 public PropertyCollection ExtendedProperties {
 112                         get { return properties; }
 113                 }
 114
 115                 [Browsable (false)]
 116                 [DataSysDescription ("Indicates that the DataSet has errors.")]
 117                 public bool HasErrors {
 118                         [MonoTODO]
 119                         get {
 120                                 throw new NotImplementedException ();
 121                         }
 122                 }
 123
 124                 [DataCategory ("Data")]
 125                 [DataSysDescription ("Indicates a locale under which to compare strings within the DataSet.")]
 126                 public CultureInfo Locale {
 127                         get {
 128                                 return locale;
 129                         }
 130                         set {
 131                                 if (locale == null || !locale.Equals(value)) {
 132                                         // TODO: check if the new locale is valid
 133                                         // TODO: update locale of all tables
 134                                         locale = value;
 135                                 }
 136                         }
 137                 }
 138
 139                 public void Merge (DataRow[] rows)
 140                 {
 141                         Merge (rows, false, MissingSchemaAction.Add);
 142                 }
 143
 144                 public void Merge (DataSet dataSet)
 145                 {
 146                         Merge (dataSet, false, MissingSchemaAction.Add);
 147                 }
 148
 149                 public void Merge (DataTable table)
 150                 {
 151                         Merge (table, false, MissingSchemaAction.Add);
 152                 }
 153
 154                 public void Merge (DataSet dataSet, bool preserveChanges)
 155                 {
 156                         Merge (dataSet, preserveChanges, MissingSchemaAction.Add);
 157                 }
 158
 159                 [MonoTODO]
 160                 public void Merge (DataRow[] rows, bool preserveChanges, MissingSchemaAction missingSchemaAction)
 161                 {
 162                         throw new NotImplementedException();
 163                 }
 164
 165                 [MonoTODO]
 166                 public void Merge (DataSet dataSet, bool preserveChanges, MissingSchemaAction missingSchemaAction)
 167                 {
 168                         throw new NotImplementedException();
 169                 }
 170
 171                 [MonoTODO]
 172                 public void Merge (DataTable table, bool preserveChanges, MissingSchemaAction missingSchemaAction)
 173                 {
 174                         throw new NotImplementedException();
 175                 }
 176
 177                 [DataCategory ("Data")]
 178                 [DataSysDescription ("Indicates the XML uri namespace for the root element pointed at by this DataSet.")]
 179                 [DefaultValue ("")]
 180                 public string Namespace {
 181                         [MonoTODO]
 182                         get { return _namespace; }
 183                         [MonoTODO]
 184                         set {
 185                                 //TODO - trigger an event if this happens?
 186                                 _namespace = value;
 187                         }
 188                 }
 189
 190                 [DataCategory ("Data")]
 191                 [DataSysDescription ("Indicates the prefix of the namespace used for this DataSet.")]
 192                 [DefaultValue ("")]
 193                 public string Prefix {
 194                         [MonoTODO]
 195                         get { return prefix; }
 196                         [MonoTODO]
 197                         set {
 198                                 //TODO - trigger an event if this happens?
 199                                 prefix = value;
 200                         }
 201                 }
 202
 203                 [DataCategory ("Data")]
 204                 [DataSysDescription ("The collection that holds the relations for this DatSet.")]
 205                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Content)]
 206                 public DataRelationCollection Relations {
 207                         get {
 208                                 return relationCollection;
 209                         }
 210                 }
 211
 212                 [Browsable (false)]
 213                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Hidden)]
 214                 public override ISite Site {
 215                         [MonoTODO]
 216                         get {
 217                                 throw new NotImplementedException ();
 218                         }
 219
 220                         [MonoTODO]
 221                         set {
 222                                 throw new NotImplementedException ();
 223                         }
 224                 }
 225
 226                 [DataCategory ("Data")]
 227                 [DataSysDescription ("The collection that holds the tables for this DataSet.")]
 228                 [DesignerSerializationVisibility (DesignerSerializationVisibility.Content)]
 229                 public DataTableCollection Tables {
 230                         get { return tableCollection; }
 231                 }
 232
 233                 #endregion // Public Properties
 234
 235                 #region Public Methods
 236
 237                 [MonoTODO]
 238                 public void AcceptChanges()
 239                 {
 240                         foreach (DataTable tempTable in tableCollection)
 241                                 tempTable.AcceptChanges ();
 242                 }
 243
 244                 public void Clear()
 245                 {
 246                         // TODO: if currently bound to a XmlDataDocument
 247                         //       throw a NotSupportedException
 248                         for (int t = 0; t < tableCollection.Count; t++) {
 249                                 tableCollection[t].Clear ();
 250                         }
 251                 }
 252
 253                 public virtual DataSet Clone()
 254                 {
 255                         DataSet Copy = new DataSet ();
 256                         CopyProperties (Copy);
 257
 258                         foreach (DataTable Table in Tables) {
 259                                 Copy.Tables.Add (Table.Clone ());
 260                         }
 261
 262                         return Copy;
 263                 }
 264
 265                 // Copies both the structure and data for this DataSet.
 266                 public DataSet Copy()
 267                 {
 268                         DataSet Copy = new DataSet ();
 269                         CopyProperties (Copy);
 270
 271                         // Copy DatSet's tables
 272                         foreach (DataTable Table in Tables) {
 273                                 Copy.Tables.Add (Table.Copy ());
 274                         }
 275
 276                         return Copy;
 277                 }
 278
 279                 [MonoTODO]
 280                 private void CopyProperties (DataSet Copy)
 281                 {
 282                         Copy.CaseSensitive = CaseSensitive;
 283                         //Copy.Container = Container
 284                         Copy.DataSetName = DataSetName;
 285                         //Copy.DefaultViewManager
 286                         //Copy.DesignMode
 287                         Copy.EnforceConstraints = EnforceConstraints;
 288                         //Copy.ExtendedProperties
 289                         //Copy.HasErrors
 290                         //Copy.Locale = Locale;
 291                         Copy.Namespace = Namespace;
 292                         Copy.Prefix = Prefix;
 293                         //Copy.Relations = Relations;
 294                         //Copy.Site = Site;
 295
 296                 }
 297
 298                 public DataSet GetChanges()
 299                 {
 300                         throw new NotImplementedException ();
 301                 }
 302
 303
 304                 public DataSet GetChanges(DataRowState rowStates)
 305                 {
 306                         throw new NotImplementedException ();
 307                 }
 308
 309                 public string GetXml()
 310                 {
 311                         StringWriter Writer = new StringWriter ();
 312                         WriteXml (Writer, XmlWriteMode.IgnoreSchema);
 313                         return Writer.ToString ();
 314                 }
 315
 316                 public string GetXmlSchema()
 317                 {
 318                         StringWriter Writer = new StringWriter ();
 319                         WriteXmlSchema (Writer);
 320                         return Writer.ToString ();
 321                 }
 322
 323                 [MonoTODO]
 324                 public bool HasChanges()
 325                 {
 326                         throw new NotImplementedException ();
 327                 }
 328
 329                 [MonoTODO]
 330                 public bool HasChanges(DataRowState rowState)
 331                 {
 332                         throw new NotImplementedException ();
 333                 }
 334
 335                 [MonoTODO]
 336                 public void InferXmlSchema(XmlReader reader, string[] nsArray)
 337                 {
 338                 }
 339
 340                 public void InferXmlSchema(Stream stream, string[] nsArray)
 341                 {
 342                         InferXmlSchema (new XmlTextReader(stream), nsArray);
 343                 }
 344
 345                 public void InferXmlSchema(TextReader reader, string[] nsArray)
 346                 {
 347                         InferXmlSchema (new XmlTextReader(reader), nsArray);
 348                 }
 349
 350                 public void InferXmlSchema(string fileName, string[] nsArray)
 351                 {
 352                         XmlTextReader reader = new XmlTextReader(fileName);
 353                         try {
 354                                 InferXmlSchema (reader, nsArray);
 355                         } finally {
 356                                 reader.Close ();
 357                         }
 358                 }
 359
 360                 public virtual void RejectChanges()
 361                 {
 362                         throw new NotImplementedException ();
 363                 }
 364
 365                 public virtual void Reset()
 366                 {
 367                         throw new NotImplementedException ();
 368                 }
 369
 370                 public void WriteXml(Stream stream)
 371                 {
 372                         XmlWriter writer = new XmlTextWriter(stream, null );
 373
 374                         WriteXml( writer );
 375                 }
 376
 377                 ///<summary>
 378                 /// Writes the current data for the DataSet to the specified file.
 379                 /// </summary>
 380                 /// <param name="filename">Fully qualified filename to write to</param>
 381                 public void WriteXml(string fileName)
 382                 {
 383                         XmlWriter writer = new XmlTextWriter(fileName, null );
 384
 385                         WriteXml( writer );
 386
 387                         writer.Close();
 388                 }
 389
 390                 public void WriteXml(TextWriter writer)
 391                 {
 392                         XmlWriter xwriter = new XmlTextWriter(writer );
 393
 394                         WriteXml( xwriter );
 395                 }
 396
 397                 public void WriteXml(XmlWriter writer)
 398                 {
 399                         WriteXml( writer, XmlWriteMode.IgnoreSchema );
 400                 }
 401
 402                 public void WriteXml(Stream stream, XmlWriteMode mode)
 403                 {
 404                         XmlWriter writer = new XmlTextWriter(stream, null );
 405
 406                         WriteXml( writer, mode );
 407                 }
 408
 409                 public void WriteXml(string fileName, XmlWriteMode mode)
 410                 {
 411                         XmlWriter writer = new XmlTextWriter(fileName, null );
 412
 413                         WriteXml( writer, mode );
 414
 415                         writer.Close();
 416                 }
 417
 418                 public void WriteXml(TextWriter writer, XmlWriteMode mode)
 419                 {
 420                         XmlWriter xwriter = new XmlTextWriter(writer);
 421
 422                         WriteXml( xwriter, mode );
 423                 }
 424
 425                 public void WriteXml(XmlWriter writer, XmlWriteMode mode)
 426                 {
 427                         if (writer.WriteState == WriteState.Start)
 428                                 writer.WriteStartDocument (true);
 429
 430                         ((XmlTextWriter)writer).Formatting = Formatting.Indented;
 431                         WriteStartElement( writer, mode, Namespace, Prefix, DataSetName );
 432
 433                         if( mode == XmlWriteMode.WriteSchema )
 434                         {
 435                                 DoWriteXmlSchema( writer );
 436                         }
 437
 438                         //Write out each table in order, providing it is not
 439                         //part of another table structure via a nested parent relationship
 440                         foreach( DataTable table in Tables )
 441                         {
 442                                 bool isTopLevel = true;
 443                                 foreach( DataRelation rel in table.ParentRelations )
 444                                 {
 445                                         if( rel.Nested )
 446                                         {
 447                                                 isTopLevel = false;
 448                                                 break;
 449                                         }
 450                                 }
 451
 452                                 if( isTopLevel )
 453                                 {
 454                                         WriteTable(  writer, table, mode );
 455                                 }
 456                         }
 457
 458                         writer.WriteEndElement();
 459                 }
 460
 461                 public void WriteXmlSchema(Stream stream)
 462                 {
 463                         XmlWriter writer = new XmlTextWriter(stream, null  );
 464
 465                         WriteXmlSchema( writer );
 466                 }
 467
 468                 public void WriteXmlSchema(string fileName)
 469                 {
 470                         XmlWriter writer = new XmlTextWriter( fileName, null );
 471
 472                         WriteXmlSchema( writer );
 473                 }
 474
 475                 public void WriteXmlSchema(TextWriter writer)
 476                 {
 477                         XmlWriter xwriter = new XmlTextWriter( writer );
 478
 479                         WriteXmlSchema( xwriter );
 480                 }
 481
 482                 public void WriteXmlSchema(XmlWriter writer)
 483                 {
 484                         ((XmlTextWriter)writer).Formatting = Formatting.Indented;
 485                         //Create a skeleton doc and then write the schema
 486                         //proper which is common to the WriteXml method in schema mode
 487                         writer.WriteStartDocument();
 488
 489                         DoWriteXmlSchema( writer );
 490
 491                         writer.WriteEndDocument();
 492                 }
 493
 494                 public void ReadXmlSchema(Stream stream)
 495                 {
 496                         XmlReader reader = new XmlTextReader( stream, null );
 497                         ReadXmlSchema( reader);
 498                 }
 499
 500                 public void ReadXmlSchema(string str)
 501                 {
 502                         XmlReader reader = new XmlTextReader( str );
 503                         ReadXmlSchema( reader );
 504                 }
 505
 506                 public void ReadXmlSchema(TextReader treader)
 507                 {
 508                         XmlReader reader = new XmlTextReader( treader );
 509                         ReadXmlSchema( reader );
 510                 }
 511
 512                 public void ReadXmlSchema(XmlReader reader)
 513                 {
 514                         XmlSchemaMapper SchemaMapper = new XmlSchemaMapper (this);
 515                         SchemaMapper.Read (reader);
 516                 }
 517
 518                 public XmlReadMode ReadXml (Stream stream)
 519                 {
 520                         return ReadXml (new XmlTextReader (stream));
 521                 }
 522
 523                 public XmlReadMode ReadXml (string str)
 524                 {
 525                         return ReadXml (new XmlTextReader (str));
 526                 }
 527
 528                 public XmlReadMode ReadXml (TextReader reader)
 529                 {
 530                         return ReadXml (new XmlTextReader (reader));
 531                 }
 532
 533                 public XmlReadMode ReadXml (XmlReader r)
 534                 {
 535                         XmlDataLoader Loader = new XmlDataLoader (this);
 536                         // FIXME: somekinda exception?
 537                         if (!r.Read ())
 538                                 return XmlReadMode.Auto; // FIXME
 539
 540                         /*\
 541                          *  If document is diffgram we will use diffgram
 542                         \*/
 543                         if (r.LocalName == "diffgram")
 544                                 return ReadXml (r, XmlReadMode.DiffGram);
 545
 546                         /*\
 547                          *  If we already have a schema, or the document
 548                          *  contains an in-line schema, sets XmlReadMode to ReadSchema.
 549                         \*/
 550
 551                         // FIXME: is this always true: "if we have tables we have to have schema also"
 552                         if (Tables.Count > 0)
 553                                 return ReadXml (r, XmlReadMode.ReadSchema);
 554
 555                         /*\
 556                          *  If we dont have a schema yet and document
 557                          *  contains no inline-schema  mode is XmlReadMode.InferSchema
 558                         \*/
 559
 560                         return ReadXml (r, XmlReadMode.InferSchema);
 561
 562                 }
 563
 564                 public XmlReadMode ReadXml (Stream stream, XmlReadMode mode)
 565                 {
 566                         return ReadXml (new XmlTextReader (stream), mode);
 567                 }
 568
 569                 public XmlReadMode ReadXml (string str, XmlReadMode mode)
 570                 {
 571                         return ReadXml (new XmlTextReader (str), mode);
 572                 }
 573
 574                 public XmlReadMode ReadXml (TextReader reader, XmlReadMode mode)
 575                 {
 576                         return ReadXml (new XmlTextReader (reader), mode);
 577                 }
 578
 579                 [MonoTODO]
 580                 public XmlReadMode ReadXml (XmlReader reader, XmlReadMode mode)
 581                 {
 582                         XmlReadMode Result = XmlReadMode.Auto;
 583
 584                         if (mode == XmlReadMode.DiffGram) {
 585                                 XmlDiffLoader DiffLoader = new XmlDiffLoader (this);
 586                                 DiffLoader.Load (reader);
 587                                 Result =  XmlReadMode.DiffGram;
 588                         }
 589                         else {
 590                                 XmlDataLoader Loader = new XmlDataLoader (this);
 591                                 Result = Loader.LoadData (reader, mode);
 592                         }
 593
 594                         return Result;
 595                 }
 596
 597                 #endregion // Public Methods
 598
 599                 #region Public Events
 600
 601                 [DataCategory ("Action")]
 602                 [DataSysDescription ("Occurs when it is not possible to merge schemas for two tables with the same name.")]
 603                 public event MergeFailedEventHandler MergeFailed;
 604
 605                 #endregion // Public Events
 606
 607                 #region Destructors
 608
 609                 ~DataSet()
 610                 {
 611                 }
 612
 613                 #endregion Destructors
 614
 615                 #region IListSource methods
 616                 IList IListSource.GetList ()
 617                 {
 618                         return DefaultViewManager;
 619                 }
 620
 621                 bool IListSource.ContainsListCollection {
 622                         get {
 623                                 return true;
 624                         }
 625                 }
 626                 #endregion IListSource methods
 627
 628                 #region ISupportInitialize methods
 629                 public void BeginInit ()
 630                 {
 631                         throw new NotImplementedException ();
 632                 }
 633
 634                 public void EndInit ()
 635                 {
 636                         throw new NotImplementedException ();
 637                 }
 638                 #endregion
 639
 640                 #region ISerializable
 641                 void ISerializable.GetObjectData (SerializationInfo si, StreamingContext sc)
 642                 {
 643                         throw new NotImplementedException ();
 644                 }
 645                 #endregion
 646
 647                 #region Protected Methods
 648                 protected void GetSerializationData(SerializationInfo info, StreamingContext context)
 649                 {
 650                         string s = info.GetValue ("XmlDiffGram", typeof (String)) as String;
 651                         if (s != null) ReadXmlSerializable (new XmlTextReader(new StringReader(s)));
 652                 }
 653
 654
 655                 protected virtual System.Xml.Schema.XmlSchema GetSchemaSerializable()
 656                 {
 657                         return null; // FIXME
 658                 }
 659
 660                 protected virtual void ReadXmlSerializable(XmlReader reader)
 661                 {
 662                         ReadXml(reader, XmlReadMode.DiffGram); // FIXME
 663                 }
 664
 665                 protected virtual bool ShouldSerializeRelations ()
 666                 {
 667                         return true;
 668                 }
 669
 670                 protected virtual bool ShouldSerializeTables ()
 671                 {
 672                         return true;
 673                 }
 674
 675                 [MonoTODO]
 676                 protected internal virtual void OnPropertyChanging (PropertyChangedEventArgs pcevent)
 677                 {
 678                 }
 679
 680                 [MonoTODO]
 681                 protected virtual void OnRemoveRelation (DataRelation relation)
 682                 {
 683                 }
 684
 685                 [MonoTODO]
 686                 protected virtual void OnRemoveTable (DataTable table)
 687                 {
 688                 }
 689
 690                 [MonoTODO]
 691                 protected internal void RaisePropertyChanging (string name)
 692                 {
 693                 }
 694                 #endregion
 695
 696                 #region Private Xml Serialisation
 697
 698                 private string WriteObjectXml( object o ) {
 699                         switch (Type.GetTypeCode (o.GetType ())) {
 700                         case TypeCode.Boolean:
 701                                 return XmlConvert.ToString ((Boolean) o);
 702                         case TypeCode.Byte:
 703                                 return XmlConvert.ToString ((Byte) o);
 704                         case TypeCode.Char:
 705                                 return XmlConvert.ToString ((Char) o);
 706                         case TypeCode.DateTime:
 707                                 return XmlConvert.ToString ((DateTime) o);
 708                         case TypeCode.Decimal:
 709                                 return XmlConvert.ToString ((Decimal) o);
 710                         case TypeCode.Double:
 711                                 return XmlConvert.ToString ((Double) o);
 712                         case TypeCode.Int16:
 713                                 return XmlConvert.ToString ((Int16) o);
 714                         case TypeCode.Int32:
 715                                 return XmlConvert.ToString ((Int32) o);
 716                         case TypeCode.Int64:
 717                                 return XmlConvert.ToString ((Int64) o);
 718                         case TypeCode.SByte:
 719                                 return XmlConvert.ToString ((SByte) o);
 720                         case TypeCode.Single:
 721                                 return XmlConvert.ToString ((Single) o);
 722                         case TypeCode.UInt16:
 723                                 return XmlConvert.ToString ((UInt16) o);
 724                         case TypeCode.UInt32:
 725                                 return XmlConvert.ToString ((UInt32) o);
 726                         case TypeCode.UInt64:
 727                                 return XmlConvert.ToString ((UInt64) o);
 728                         }
 729                         if (o is TimeSpan) return XmlConvert.ToString ((TimeSpan) o);
 730                         if (o is Guid) return XmlConvert.ToString ((Guid) o);
 731                         return o.ToString();
 732                 }
 733
 734                 private void WriteTable( XmlWriter writer, DataTable table, XmlWriteMode mode )
 735                 {
 736                         DataRow[] rows = new DataRow [table.Rows.Count];
 737                         table.Rows.CopyTo (rows, 0);
 738                         WriteTable (writer, rows, mode);
 739                 }
 740
 741                 private void WriteTable( XmlWriter writer, DataRow[] rows, XmlWriteMode mode )
 742                 {
 743                         //The columns can be attributes, hidden, elements, or simple content
 744                         //There can be 0-1 simple content cols or 0-* elements
 745                         System.Collections.ArrayList atts;
 746                         System.Collections.ArrayList elements;
 747                         DataColumn simple = null;
 748
 749                         if (rows.Length == 0) return;
 750                         DataTable table = rows[0].Table;
 751                         SplitColumns( table, out atts, out elements, out simple );
 752
 753                         foreach( DataRow row in rows )
 754                         {
 755                                 //sort out the namespacing
 756                                 string nspc = table.Namespace.Length > 0 ? table.Namespace : Namespace;
 757
 758                                 // First check are all the rows null. If they are we just write empty element
 759                                 bool AllNulls = true;
 760                                 foreach (DataColumn dc in table.Columns) {
 761
 762                                         if (row [dc.ColumnName] != DBNull.Value) {
 763                                                 AllNulls = false;
 764                                                 break;
 765                                         }
 766                                 }
 767
 768                                 // If all of the columns were null, we have to write empty element
 769                                 if (AllNulls) {
 770                                         writer.WriteElementString (table.TableName, "");
 771                                         continue;
 772                                 }
 773
 774                                 WriteStartElement( writer, mode, nspc, table.Prefix, table.TableName );
 775
 776                                 foreach( DataColumn col in atts )
 777                                 {
 778                                         WriteAttributeString( writer, mode, col.Namespace, col.Prefix, col.ColumnName, row[col].ToString() );
 779                                 }
 780
 781                                 if( simple != null )
 782                                 {
 783                                         writer.WriteString( WriteObjectXml(row[simple]) );
 784                                 }
 785                                 else
 786                                 {
 787                                         foreach( DataColumn col in elements )
 788                                         {
 789                                                 string colnspc = nspc;
 790                                                 object rowObject = row [col];
 791
 792                                                 if (rowObject == null || rowObject == DBNull.Value)
 793                                                         continue;
 794
 795                                                 if( col.Namespace != null )
 796                                                 {
 797                                                         colnspc = col.Namespace;
 798                                                 }
 799
 800                                                 //TODO check if I can get away with write element string
 801                                                 WriteStartElement( writer, mode, colnspc, col.Prefix, col.ColumnName );
 802                                                 writer.WriteString( WriteObjectXml(rowObject) );
 803                                                 writer.WriteEndElement();
 804                                         }
 805                                 }
 806
 807                                 foreach (DataRelation relation in table.ChildRelations) {
 808                                         if (relation.Nested) {
 809                                                 WriteTable (writer, row.GetChildRows(relation), mode);
 810                                         }
 811                                 }
 812
 813                                 writer.WriteEndElement();
 814                         }
 815
 816                 }
 817
 818                 private void WriteStartElement( XmlWriter writer, XmlWriteMode mode, string nspc, string prefix, string name )
 819                 {
 820                         switch(  mode )
 821                                 {
 822                                         case XmlWriteMode.WriteSchema:
 823                                                 if( nspc == null || nspc == "" )
 824                                                 {
 825                                                         writer.WriteStartElement( name );
 826                                                 }
 827                                                 else if( prefix != null )
 828                                                 {
 829                                                         writer.WriteStartElement(prefix, name, nspc );
 830                                                 }
 831                                                 else
 832                                                 {
 833                                                         writer.WriteStartElement( writer.LookupPrefix( nspc ), name, nspc );
 834                                                 }
 835                                                 break;
 836                                         case XmlWriteMode.DiffGram:
 837                                                 throw new NotImplementedException();
 838                                         default:
 839                                                 writer.WriteStartElement(name );
 840                                                 break;
 841                                 };
 842                 }
 843
 844                 private void WriteAttributeString( XmlWriter writer, XmlWriteMode mode, string nspc, string prefix, string name, string stringValue )
 845                 {
 846                         switch(  mode )
 847                                 {
 848                                         case XmlWriteMode.WriteSchema:
 849                                                 writer.WriteAttributeString(prefix, name, nspc );
 850                                                 break;
 851                                         case XmlWriteMode.DiffGram:
 852                                                 throw new NotImplementedException();
 853                                         default:
 854                                                 writer.WriteAttributeString(name, stringValue );
 855                                                 break;
 856                                 };
 857                 }
 858
 859                 private void DoWriteXmlSchema( XmlWriter writer )
 860                 {
 861                         //Create the root element and declare all the namespaces etc
 862                         writer.WriteStartElement(XmlConstants.SchemaPrefix, XmlConstants.SchemaElement,
 863                                                                                 XmlConstants.SchemaNamespace );
 864                         writer.WriteAttributeString( XmlConstants.TargetNamespace, Namespace );
 865                         writer.WriteAttributeString( "xmlns:" + XmlConstants.TnsPrefix, Namespace );
 866                         writer.WriteAttributeString( "xmlns", Namespace );
 867                         writer.WriteAttributeString(  "xmlns:" + XmlConstants.MsdataPrefix,
 868                                                     XmlConstants.MsdataNamespace );
 869                         //Set up the attribute and element forms.
 870                         //TODO - is it possible to change this?
 871                         //I couldn't spot if it was so I assumed
 872                         //that this is set to qualified all round basedon the MS output
 873                         writer.WriteAttributeString( XmlConstants.AttributeFormDefault,
 874                                                     XmlConstants.Qualified );
 875                         writer.WriteAttributeString( XmlConstants.ElementFormDefault,
 876                                                     XmlConstants.Qualified );
 877
 878
 879                         //<xs:element name="DSName msdata:IsDataSet="true" msdata:Locale="machine-locale">
 880                         //Create the data set element
 881                         //All the tables are represented as choice elements in an unlimited series
 882                         writer.WriteStartElement( XmlConstants.SchemaPrefix,
 883                                                         XmlConstants.Element,
 884                                                         XmlConstants.SchemaNamespace );
 885
 886                         writer.WriteAttributeString( XmlConstants.Name, DataSetName );
 887                         writer.WriteAttributeString( XmlConstants.MsdataPrefix,  XmlConstants.IsDataSet, XmlConstants.MsdataNamespace, "true" );
 888                         //FIXME - sort out the locale string!
 889
 890                         writer.WriteAttributeString( XmlConstants.MsdataPrefix, XmlConstants.Locale, XmlConstants.MsdataNamespace, Thread.CurrentThread.CurrentCulture.Name);
 891
 892                         //<xs:complexType>
 893                         writer.WriteStartElement( XmlConstants.SchemaPrefix,
 894                                                         XmlConstants.ComplexType,
 895                                                         XmlConstants.SchemaNamespace );
 896
 897                         //<xs:choice maxOccurs="unbounded">
 898                         writer.WriteStartElement( XmlConstants.SchemaPrefix,
 899                                                         XmlConstants.Choice,
 900                                                         XmlConstants.SchemaNamespace );
 901
 902                         writer.WriteAttributeString( XmlConstants.MaxOccurs, XmlConstants.Unbounded );
 903
 904
 905                         //Write out schema for each table in order, providing it is not
 906                         //part of another table structure via a nested parent relationship
 907                         foreach( DataTable table in Tables )
 908                         {
 909                                 bool isTopLevel = true;
 910                                 foreach( DataRelation rel in table.ParentRelations )
 911                                 {
 912                                         if( rel.Nested )
 913                                         {
 914                                                 isTopLevel = false;
 915                                                 break;
 916                                         }
 917                                 }
 918
 919                                 if( isTopLevel )
 920                                 {
 921                                         WriteTableSchema(  writer, table );
 922                                 }
 923                         }
 924
 925                         //</xs:choice>
 926                         writer.WriteEndElement();
 927                         //</xs:complexType>
 928                         writer.WriteEndElement();
 929
 930                         //TODO - now add in the relationships as key and unique constraints etc
 931
 932                         //</xs:element>
 933                         writer.WriteEndElement();
 934
 935
 936                         //</schema>
 937                         writer.WriteEndElement();
 938                 }
 939
 940                 private void WriteTableSchema( XmlWriter writer, DataTable table )
 941                 {
 942                         ArrayList elements;
 943                         ArrayList atts;
 944                         DataColumn simple;
 945
 946                         SplitColumns( table,out  atts, out elements, out simple );
 947
 948                         //<xs:element name="TableName">
 949                         writer.WriteStartElement( XmlConstants.SchemaPrefix,
 950                                                  XmlConstants.Element,
 951                                                  XmlConstants.SchemaNamespace );
 952
 953                         writer.WriteAttributeString( XmlConstants.Name, table.TableName );
 954
 955                         //<xs:complexType>
 956                         writer.WriteStartElement( XmlConstants.SchemaPrefix,
 957                                                  XmlConstants.ComplexType,
 958                                                  XmlConstants.SchemaNamespace );
 959
 960                         //TODO - what about the simple content?
 961                         if( elements.Count == 0 )
 962                         {
 963                         }
 964                         else
 965                         {
 966                         //A sequence of element types or a simple content node
 967                         //<xs:sequence>
 968                         writer.WriteStartElement( XmlConstants.SchemaPrefix,
 969                                                  XmlConstants.Sequence,
 970                                                  XmlConstants.SchemaNamespace );
 971                         foreach( DataColumn col in elements )
 972                         {
 973                                 //<xs:element name=ColumnName type=MappedType Ordinal=index>
 974                                 writer.WriteStartElement( XmlConstants.SchemaPrefix,
 975                                                  XmlConstants.Element,
 976                                                  XmlConstants.SchemaNamespace );
 977
 978                                 writer.WriteAttributeString( XmlConstants.Name, col.ColumnName );
 979
 980                                 if (col.ColumnName != col.Caption && col.Caption != string.Empty)
 981                                         writer.WriteAttributeString( XmlConstants.MsdataPrefix, XmlConstants.Caption,
 982                                                                      XmlConstants.MsdataNamespace, col.Caption);
 983
 984                                 if (col.DefaultValue.ToString () != string.Empty)
 985                                         writer.WriteAttributeString( XmlConstants.Default, col.DefaultValue.ToString ());
 986
 987                                 writer.WriteAttributeString( XmlConstants.Type, MapType( col.DataType ) );
 988
 989                                 if( col.AllowDBNull )
 990                                 {
 991                                         writer.WriteAttributeString( XmlConstants.MinOccurs, "0" );
 992                                 }
 993
 994                                 //writer.WriteAttributeString( XmlConstants.MsdataPrefix,
 995                                 //                            XmlConstants.Ordinal,
 996                                 //                            XmlConstants.MsdataNamespace,
 997                                 //                            col.Ordinal.ToString() );
 998
 999                                 // Write SimpleType if column have MaxLength
1000                                 if (col.MaxLength > -1) {
1001
1002                                         WriteTableSimpleType (writer, col);
1003                                 }
1004
1005
1006                                 //</xs:element>
1007                                 writer.WriteEndElement();
1008                         }
1009                         //</xs:sequence>
1010                         writer.WriteEndElement();
1011
1012                         }
1013                         //Then a list of attributes
1014                         foreach( DataColumn col in atts )
1015                         {
1016                                 //<xs:attribute name=col.ColumnName form="unqualified" type=MappedType/>
1017                                 writer.WriteStartElement( XmlConstants.SchemaPrefix,
1018                                                  XmlConstants.Attribute,
1019                                                  XmlConstants.SchemaNamespace );
1020
1021                                 writer.WriteAttributeString( XmlConstants.Name, col.ColumnName );
1022                                 writer.WriteAttributeString( XmlConstants.Form, XmlConstants.Unqualified );
1023                                 writer.WriteAttributeString( XmlConstants.Type, MapType( col.DataType ) );
1024
1025                                 writer.WriteEndElement();
1026                         }
1027
1028                         //</xs:complexType>
1029                         writer.WriteEndElement();
1030
1031                         //</xs:element>
1032                         writer.WriteEndElement();
1033                 }
1034
1035                 private void WriteTableSimpleType (XmlWriter writer, DataColumn col)
1036                 {
1037                         // SimpleType
1038                         writer.WriteStartElement( XmlConstants.SchemaPrefix, XmlConstants.SimpleType,
1039                                                   XmlConstants.SchemaNamespace);
1040
1041                         // Restriction
1042                         writer.WriteStartElement( XmlConstants.SchemaPrefix, XmlConstants.Restriction,
1043                                                   XmlConstants.SchemaNamespace);
1044
1045                         writer.WriteAttributeString( XmlConstants.Base, MapType( col.DataType ) );
1046
1047                         // MaxValue
1048                         writer.WriteStartElement( XmlConstants.SchemaPrefix, XmlConstants.MaxLength,
1049                                                   XmlConstants.SchemaNamespace);
1050                         writer.WriteAttributeString( XmlConstants.Value, col.MaxLength.ToString ());
1051
1052
1053                         writer.WriteEndElement();
1054
1055                         writer.WriteEndElement();
1056
1057                         writer.WriteEndElement();
1058                 }
1059
1060                 ///<summary>
1061                 /// Helper function to split columns into attributes elements and simple
1062                 /// content
1063                 /// </summary>
1064                 private void SplitColumns(      DataTable table,
1065                                                                         out ArrayList atts,
1066                                                                         out ArrayList elements,
1067                                                                         out DataColumn simple)
1068                 {
1069                         //The columns can be attributes, hidden, elements, or simple content
1070                         //There can be 0-1 simple content cols or 0-* elements
1071                         atts = new System.Collections.ArrayList();
1072                         elements = new System.Collections.ArrayList();
1073                         simple = null;
1074
1075                         //Sort out the columns
1076                         foreach( DataColumn col in table.Columns )
1077                         {
1078                                 switch( col.ColumnMapping )
1079                                 {
1080                                         case MappingType.Attribute:
1081                                                 atts.Add( col );
1082                                                 break;
1083                                         case MappingType.Element:
1084                                                 elements.Add( col );
1085                                                 break;
1086                                         case MappingType.SimpleContent:
1087                                                 if( simple != null )
1088                                                 {
1089                                                         throw new System.InvalidOperationException( "There may only be one simple content element" );
1090                                                 }
1091                                                 simple = col;
1092                                                 break;
1093                                         default:
1094                                                 //ignore Hidden elements
1095                                                 break;
1096                                 }
1097                         }
1098                 }
1099
1100                 [MonoTODO]
1101                 private string MapType( Type type )
1102                 {
1103                         string Result = "xs:string";
1104
1105                         // TODO: More types to map?
1106
1107                         if (typeof (string) == type)
1108                                 Result = "xs:string";
1109                         else if (typeof (short) == type)
1110                                 Result = "xs:short";
1111                         else if (typeof (int) == type)
1112                                 Result = "xs:int";
1113                         else if (typeof (long) == type)
1114                                 Result = "xs:long";
1115                         else if (typeof (bool) == type)
1116                                 Result = "xs:boolean";
1117                         else if (typeof (byte) == type)
1118                                 Result = "xs:unsignedByte";
1119                         else if (typeof (char) == type)
1120                                 Result = "xs:char";
1121                         else if (typeof (DateTime) == type)
1122                                 Result = "xs:dateTime";
1123                         else if (typeof (decimal) == type)
1124                                 Result = "xs:decimal";
1125                         else if (typeof (double) == type)
1126                                 Result = "xs:double";
1127                         else if (typeof (sbyte) == type)
1128                                 Result = "xs:sbyte";
1129                         else if (typeof (Single) == type)
1130                                 Result = "xs:float";
1131                         else if (typeof (TimeSpan) == type)
1132                                 Result = "xs:duration";
1133                         else if (typeof (ushort) == type)
1134                                 Result = "xs:usignedShort";
1135                         else if (typeof (uint) == type)
1136                                 Result = "xs:unsignedInt";
1137                         else if (typeof (ulong) == type)
1138                                 Result = "xs:unsignedLong";
1139
1140                         return Result;
1141                 }
1142
1143                 #endregion //Private Xml Serialisation
1144         }
1145 }