mcs/class/System.Data/System.Data/XmlTableWriter.cs

   1 //
   2 // System.Data/XmlTableWriter.cs
   3 //
   4 // Author:
   5 //   Patrick Earl <mono@patearl.net>
   6 //
   7 // Copyright (c) 2006, Patrick Earl
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27
  28 #if NET_2_0
  29 using System;
  30 using System.Collections.Generic;
  31 using System.Data;
  32 using System.Xml;
  33
  34 internal class XmlTableWriter {
  35         // This method is modelled after the DataSet's WriteXml functionality.
  36         internal static void WriteTables(XmlWriter writer,
  37                                  XmlWriteMode mode,
  38                                  List<DataTable> tables,
  39                                  List<DataRelation> relations,
  40                                  string mainDataTable,
  41                                  string dataSetName)
  42         {
  43                 if (mode == XmlWriteMode.DiffGram) {
  44                         foreach (DataTable table in tables)
  45                                 table.SetRowsID();
  46                         DataSet.WriteDiffGramElement(writer);
  47                 }
  48
  49                 bool shouldOutputContent = (mode != XmlWriteMode.DiffGram);
  50                 for (int n = 0; n < tables.Count && !shouldOutputContent; n++)
  51                         shouldOutputContent = tables[n].Rows.Count > 0;
  52
  53                 if (shouldOutputContent) {
  54                         // We assume that tables[0] is the main table being written.
  55                         // We happen to know that the code above us does things that way.
  56                         DataSet.WriteStartElement(writer, mode, tables[0].Namespace, tables[0].Prefix, XmlHelper.Encode(dataSetName));
  57
  58                         if (mode == XmlWriteMode.WriteSchema) {
  59                                 DataTable [] _tables = new DataTable[tables.Count];
  60                                 tables.CopyTo(_tables);
  61                                 DataRelation[] _relations = new DataRelation[relations.Count];
  62                                 relations.CopyTo(_relations);
  63                                 new XmlSchemaWriter(writer,
  64                                         _tables,
  65                                         _relations,
  66                                         mainDataTable,
  67                                         dataSetName
  68                                 ).WriteSchema();
  69                         }
  70
  71                         WriteTableList (writer, mode, tables, DataRowVersion.Default);
  72
  73                         writer.WriteEndElement();
  74                 }
  75
  76                 if (mode == XmlWriteMode.DiffGram) {
  77                         List<DataTable> changedTables = new List<DataTable>();
  78                         foreach (DataTable table in tables) {
  79                                 DataTable changed = table.GetChanges(DataRowState.Modified | DataRowState.Deleted);
  80                                 if (changed != null && changed.Rows.Count > 0) {
  81                                         changedTables.Add(changed);
  82                                 }
  83                         }
  84                         if (changedTables.Count > 0) {
  85                                 DataSet.WriteStartElement(writer, XmlWriteMode.DiffGram, XmlConstants.DiffgrNamespace, XmlConstants.DiffgrPrefix, "before");
  86                                 WriteTableList (writer, mode, changedTables, DataRowVersion.Original);
  87                                 writer.WriteEndElement();
  88                         }
  89
  90                         writer.WriteEndElement(); // diffgr:diffgram
  91                 }
  92
  93                 writer.Flush();
  94         }
  95
  96         internal static void WriteTableList(XmlWriter writer, XmlWriteMode mode, List<DataTable> tables, DataRowVersion version)
  97         {
  98                 foreach (DataTable table in tables)
  99                         DataSet.WriteTable(writer, table, mode, version);
 100         }
 101 }
 102 #endif