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//------------------------------------------------------------------------------
// <copyright file="XMLDiffLoader.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
// <owner current="true" primary="false">Microsoft</owner>
// <owner current="false" primary="false">Microsoft</owner>
//------------------------------------------------------------------------------
namespace System.Data {
using System;
using System.Runtime.Serialization.Formatters;
using System.Configuration.Assemblies;
using System.Runtime.InteropServices;
using System.Diagnostics;
using System.IO;
using System.Collections;
using System.Globalization;
using Microsoft.Win32;
using System.ComponentModel;
using System.Xml;
using System.Xml.Serialization;
internal sealed class XMLDiffLoader {
ArrayList tables;
DataSet dataSet = null;
DataTable dataTable = null;
internal void LoadDiffGram(DataSet ds, XmlReader dataTextReader) {
XmlReader reader = DataTextReader.CreateReader(dataTextReader);
dataSet = ds;
while (reader.LocalName == Keywords.SQL_BEFORE && reader.NamespaceURI==Keywords.DFFNS) {
ProcessDiffs(ds, reader);
reader.Read(); // now the reader points to the error section
}
while (reader.LocalName == Keywords.MSD_ERRORS && reader.NamespaceURI==Keywords.DFFNS) {
ProcessErrors(ds, reader);
Debug.Assert(reader.LocalName == Keywords.MSD_ERRORS && reader.NamespaceURI==Keywords.DFFNS, "something fishy");
reader.Read(); // pass the end of errors tag
}
}
private void CreateTablesHierarchy(DataTable dt) {
foreach( DataRelation r in dt.ChildRelations ) {
if (! tables.Contains((DataTable)r.ChildTable)) {
tables.Add((DataTable)r.ChildTable);
CreateTablesHierarchy(r.ChildTable) ;
}
}
}
internal void LoadDiffGram(DataTable dt, XmlReader dataTextReader) {
XmlReader reader = DataTextReader.CreateReader(dataTextReader);
dataTable = dt;
tables = new ArrayList();
tables.Add(dt);
CreateTablesHierarchy(dt);
while (reader.LocalName == Keywords.SQL_BEFORE && reader.NamespaceURI==Keywords.DFFNS) {
ProcessDiffs(tables, reader);
reader.Read(); // now the reader points to the error section
}
while (reader.LocalName == Keywords.MSD_ERRORS && reader.NamespaceURI==Keywords.DFFNS) {
ProcessErrors(tables, reader);
Debug.Assert(reader.LocalName == Keywords.MSD_ERRORS && reader.NamespaceURI==Keywords.DFFNS, "something fishy");
reader.Read(); // pass the end of errors tag
}
}
internal void ProcessDiffs(DataSet ds, XmlReader ssync) {
DataTable tableBefore;
DataRow row;
int oldRowRecord;
int pos = -1;
int iSsyncDepth = ssync.Depth;
ssync.Read(); // pass the before node.
SkipWhitespaces(ssync);
while (iSsyncDepth < ssync.Depth) {
tableBefore = null;
string diffId = null;
oldRowRecord = -1;
// the diffgramm always contains sql:before and sql:after pairs
int iTempDepth = ssync.Depth;
diffId = ssync.GetAttribute(Keywords.DIFFID, Keywords.DFFNS);
bool hasErrors = (bool) (ssync.GetAttribute(Keywords.HASERRORS, Keywords.DFFNS) == Keywords.TRUE);
oldRowRecord = ReadOldRowData(ds, ref tableBefore, ref pos, ssync);
if (oldRowRecord == -1)
continue;
if (tableBefore == null)
throw ExceptionBuilder.DiffgramMissingSQL();
row = (DataRow)tableBefore.RowDiffId[diffId];
if (row != null) {
row.oldRecord = oldRowRecord ;
tableBefore.recordManager[oldRowRecord] = row;
} else {
row = tableBefore.NewEmptyRow();
tableBefore.recordManager[oldRowRecord] = row;
row.oldRecord = oldRowRecord;
row.newRecord = oldRowRecord;
tableBefore.Rows.DiffInsertAt(row, pos);
row.Delete();
if (hasErrors)
tableBefore.RowDiffId[diffId] = row;
}
}
return;
}
internal void ProcessDiffs(ArrayList tableList, XmlReader ssync) {
DataTable tableBefore;
DataRow row;
int oldRowRecord;
int pos = -1;
int iSsyncDepth = ssync.Depth;
ssync.Read(); // pass the before node.
//SkipWhitespaces(ssync); for given scenario does not require this change, but in fact we should do it.
while (iSsyncDepth < ssync.Depth) {
tableBefore = null;
string diffId = null;
oldRowRecord = -1;
// the diffgramm always contains sql:before and sql:after pairs
int iTempDepth = ssync.Depth;
diffId = ssync.GetAttribute(Keywords.DIFFID, Keywords.DFFNS);
bool hasErrors = (bool) (ssync.GetAttribute(Keywords.HASERRORS, Keywords.DFFNS) == Keywords.TRUE);
oldRowRecord = ReadOldRowData(dataSet, ref tableBefore, ref pos, ssync);
if (oldRowRecord == -1)
continue;
if (tableBefore == null)
throw ExceptionBuilder.DiffgramMissingSQL();
row = (DataRow)tableBefore.RowDiffId[diffId];
if (row != null) {
row.oldRecord = oldRowRecord ;
tableBefore.recordManager[oldRowRecord] = row;
} else {
row = tableBefore.NewEmptyRow();
tableBefore.recordManager[oldRowRecord] = row;
row.oldRecord = oldRowRecord;
row.newRecord = oldRowRecord;
tableBefore.Rows.DiffInsertAt(row, pos);
row.Delete();
if (hasErrors)
tableBefore.RowDiffId[diffId] = row;
}
}
return;
}
internal void ProcessErrors(DataSet ds, XmlReader ssync) {
DataTable table;
int iSsyncDepth = ssync.Depth;
ssync.Read(); // pass the before node.
while (iSsyncDepth < ssync.Depth) {
table = ds.Tables.GetTable(XmlConvert.DecodeName(ssync.LocalName), ssync.NamespaceURI);
if (table == null)
throw ExceptionBuilder.DiffgramMissingSQL();
string diffId = ssync.GetAttribute(Keywords.DIFFID, Keywords.DFFNS);
DataRow row = (DataRow)table.RowDiffId[diffId];
string rowError = ssync.GetAttribute(Keywords.MSD_ERROR, Keywords.DFFNS);
if (rowError != null)
row.RowError = rowError;
int iRowDepth = ssync.Depth;
ssync.Read(); // we may be inside a column
while (iRowDepth < ssync.Depth) {
if (XmlNodeType.Element == ssync.NodeType) {
DataColumn col = table.Columns[XmlConvert.DecodeName(ssync.LocalName), ssync.NamespaceURI];
//if (col == null)
// throw exception here
string colError = ssync.GetAttribute(Keywords.MSD_ERROR, Keywords.DFFNS);
row.SetColumnError(col, colError);
}
ssync.Read();
}
while ((ssync.NodeType == XmlNodeType.EndElement) && (iSsyncDepth < ssync.Depth) )
ssync.Read();
}
return;
}
internal void ProcessErrors(ArrayList dt, XmlReader ssync) {
DataTable table;
int iSsyncDepth = ssync.Depth;
ssync.Read(); // pass the before node.
while (iSsyncDepth < ssync.Depth) {
table = GetTable(XmlConvert.DecodeName(ssync.LocalName), ssync.NamespaceURI);
if (table == null)
throw ExceptionBuilder.DiffgramMissingSQL();
string diffId = ssync.GetAttribute(Keywords.DIFFID, Keywords.DFFNS);
DataRow row = (DataRow)table.RowDiffId[diffId];
if (row == null) {
for(int i = 0; i < dt.Count; i++) {
row = (DataRow)((DataTable)dt[i]).RowDiffId[diffId];
if (row != null) {
table = row.Table;
break;
}
}
}
string rowError = ssync.GetAttribute(Keywords.MSD_ERROR, Keywords.DFFNS);
if (rowError != null)
row.RowError = rowError;
int iRowDepth = ssync.Depth;
ssync.Read(); // we may be inside a column
while (iRowDepth < ssync.Depth) {
if (XmlNodeType.Element == ssync.NodeType) {
DataColumn col = table.Columns[XmlConvert.DecodeName(ssync.LocalName), ssync.NamespaceURI];
//if (col == null)
// throw exception here
string colError = ssync.GetAttribute(Keywords.MSD_ERROR, Keywords.DFFNS);
row.SetColumnError(col, colError);
}
ssync.Read();
}
while ((ssync.NodeType == XmlNodeType.EndElement) && (iSsyncDepth < ssync.Depth) )
ssync.Read();
}
return;
}
private DataTable GetTable(string tableName, string ns) {
if (tables == null)
return dataSet.Tables.GetTable(tableName, ns);
if (tables.Count == 0)
return (DataTable)tables[0];
for(int i = 0; i < tables.Count; i++) {
DataTable dt = (DataTable)tables[i];
if ((string.Compare(dt.TableName, tableName, StringComparison.Ordinal) == 0)
&& (string.Compare(dt.Namespace, ns, StringComparison.Ordinal) == 0))
return dt;
}
return null;
}
private int ReadOldRowData(DataSet ds, ref DataTable table, ref int pos, XmlReader row) {
// read table information
if (ds != null) {
table = ds.Tables.GetTable(XmlConvert.DecodeName(row.LocalName), row.NamespaceURI);
}
else {
table = GetTable(XmlConvert.DecodeName(row.LocalName), row.NamespaceURI);
}
if (table == null) {
row.Skip(); // need to skip this element if we dont know about it, before returning -1
return -1;
}
int iRowDepth = row.Depth;
string value = null;
if (table == null)
throw ExceptionBuilder.DiffgramMissingTable(XmlConvert.DecodeName(row.LocalName));
value = row.GetAttribute(Keywords.ROWORDER, Keywords.MSDNS);
if (!Common.ADP.IsEmpty(value)) {
pos = (Int32) Convert.ChangeType(value, typeof(Int32), null);
}
int record = table.NewRecord();
foreach (DataColumn col in table.Columns) {
col[record] = DBNull.Value;
}
foreach (DataColumn col in table.Columns) {
if ((col.ColumnMapping == MappingType.Element) ||
(col.ColumnMapping == MappingType.SimpleContent))
continue;
if (col.ColumnMapping == MappingType.Hidden) {
value = row.GetAttribute("hidden"+col.EncodedColumnName, Keywords.MSDNS);
}
else {
value = row.GetAttribute(col.EncodedColumnName, col.Namespace);
}
if (value == null) {
continue;
}
col[record] = col.ConvertXmlToObject(value);
}
row.Read();
SkipWhitespaces(row);
int currentDepth = row.Depth;
if (currentDepth <= iRowDepth) {
// the node is empty
if (currentDepth == iRowDepth && row.NodeType == XmlNodeType.EndElement) {
// VSTFDEVDIV 764390: read past the EndElement of the current row
// note: (currentDepth == iRowDepth) check is needed so we do not skip elements on parent rows.
row.Read();
SkipWhitespaces(row);
}
return record;
}
if (table.XmlText != null) {
DataColumn col = table.XmlText;
col[record] = col.ConvertXmlToObject(row.ReadString());
}
else {
while (row.Depth > iRowDepth) {
String ln =XmlConvert.DecodeName( row.LocalName) ;
String ns = row.NamespaceURI;
DataColumn column = table.Columns[ln, ns];
if (column == null) {
while((row.NodeType != XmlNodeType.EndElement) && (row.LocalName!=ln) && (row.NamespaceURI!=ns))
row.Read(); // consume the current node
row.Read(); // now points to the next column
//SkipWhitespaces(row); seems no need, just in case if we see other issue , this will be here as hint
continue;// add a read here!
}
if (column.IsCustomType) {
// if column's type is object or column type does not implement IXmlSerializable
bool isPolymorphism = (column.DataType == typeof(Object)|| (row.GetAttribute(Keywords.MSD_INSTANCETYPE, Keywords.MSDNS) != null) ||
(row.GetAttribute(Keywords.TYPE, Keywords.XSINS) != null)) ;
bool skipped = false;
if (column.Table.DataSet != null && column.Table.DataSet.UdtIsWrapped) {
row.Read(); // if UDT is wrapped, skip the wrapper
skipped = true;
}
XmlRootAttribute xmlAttrib = null;
if (!isPolymorphism && !column.ImplementsIXMLSerializable) { // THIS
// if does not implement IXLSerializable, need to go with XmlSerializer: pass XmlRootAttribute
if (skipped) {
xmlAttrib = new XmlRootAttribute(row.LocalName);
xmlAttrib.Namespace = row.NamespaceURI ;
}
else {
xmlAttrib = new XmlRootAttribute(column.EncodedColumnName);
xmlAttrib.Namespace = column.Namespace;
}
}
// for else case xmlAttrib MUST be null
column[record] = column.ConvertXmlToObject(row, xmlAttrib); // you need to pass null XmlAttib here
if (skipped) {
row.Read(); // if Wrapper is skipped, skip its end tag
}
}
else {
int iColumnDepth = row.Depth;
row.Read();
// SkipWhitespaces(row);seems no need, just in case if we see other issue , this will be here as hint
if (row.Depth > iColumnDepth) { //we are inside the column
if (row.NodeType == XmlNodeType.Text || row.NodeType == XmlNodeType.Whitespace || row.NodeType == XmlNodeType.SignificantWhitespace) {
String text = row.ReadString();
column[record] = column.ConvertXmlToObject(text);
row.Read(); // now points to the next column
}
}
else {
// <element></element> case
if (column.DataType == typeof(string))
column[record] = string.Empty;
}
}
}
}
row.Read(); //now it should point to next row
SkipWhitespaces(row);
return record;
}
internal void SkipWhitespaces(XmlReader reader) {
while (reader.NodeType == XmlNodeType.Whitespace || reader.NodeType == XmlNodeType.SignificantWhitespace) {
reader.Read();
}
}
}
}
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