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linux-packaging-mono/mcs/class/referencesource/System.Data/System/NewXml/XPathNodePointer.cs

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Imported Upstream version 4.6.0.125 Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4
2016-08-03 10:59:49 +00:00
//------------------------------------------------------------------------------
// <copyright file="XPathNodePointer.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
Imported Upstream version 5.4.0.167 Former-commit-id: 5624ac747d633e885131e8349322922b6a59baaa
2017-08-21 15:34:15 +00:00
// <owner current="true" primary="true">Microsoft</owner>
// <owner current="true" primary="false">Microsoft</owner>
Imported Upstream version 4.6.0.125 Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4
2016-08-03 10:59:49 +00:00
//------------------------------------------------------------------------------
#pragma warning disable 618 // ignore obsolete warning about XmlDataDocument
namespace System.Xml {
using System;
using System.Data;
using System.Diagnostics;
using System.Xml.XPath;
internal sealed class XPathNodePointer : IXmlDataVirtualNode {
private WeakReference _owner; // Owner of this pointer (an DataDocumentXPathNavigator). When the associated DataDocumentXPathNavigator (the owner) goes away, this XPathNodePointer can go away as well.
private XmlDataDocument _doc;
private XmlNode _node;
private DataColumn _column;
private bool _fOnValue;
internal XmlBoundElement _parentOfNS;
internal static int[] xmlNodeType_To_XpathNodeType_Map;
internal static string s_strReservedXmlns = "http://www.w3.org/2000/xmlns/";
internal static string s_strReservedXml = "http://www.w3.org/XML/1998/namespace";
internal static string s_strXmlNS = "xmlns";
private bool _bNeedFoliate;
static XPathNodePointer(){
#if DEBUG
int max=0, tempVal=0;
Array enumValues = Enum.GetValues(typeof(XmlNodeType));
for ( int i = 0; i < enumValues.Length; i++) {
tempVal = (int)enumValues.GetValue(i);
if ( tempVal > max )
max = tempVal;
}
Debug.Assert( max == (int) XmlNodeType.XmlDeclaration );
#endif
xmlNodeType_To_XpathNodeType_Map = new int[20];
xmlNodeType_To_XpathNodeType_Map[(int)(XmlNodeType.None)] = -1;
xmlNodeType_To_XpathNodeType_Map[(int)(XmlNodeType.Element)] = (int)XPathNodeType.Element;
xmlNodeType_To_XpathNodeType_Map[(int)(XmlNodeType.Attribute)] = (int)XPathNodeType.Attribute;
xmlNodeType_To_XpathNodeType_Map[(int)(XmlNodeType.Text)] = (int)XPathNodeType.Text;
xmlNodeType_To_XpathNodeType_Map[(int)(XmlNodeType.CDATA)] = (int)XPathNodeType.Text;
xmlNodeType_To_XpathNodeType_Map[(int)(XmlNodeType.EntityReference)] = -1;
xmlNodeType_To_XpathNodeType_Map[(int)(XmlNodeType.Entity)] = -1;
xmlNodeType_To_XpathNodeType_Map[(int)(XmlNodeType.ProcessingInstruction)] = (int)XPathNodeType.ProcessingInstruction;
xmlNodeType_To_XpathNodeType_Map[(int)(XmlNodeType.Comment)] = (int)XPathNodeType.Comment;
xmlNodeType_To_XpathNodeType_Map[(int)(XmlNodeType.Document)] = (int)XPathNodeType.Root;
xmlNodeType_To_XpathNodeType_Map[(int)(XmlNodeType.DocumentType)] = -1;
xmlNodeType_To_XpathNodeType_Map[(int)(XmlNodeType.DocumentFragment)] = (int)XPathNodeType.Root;
xmlNodeType_To_XpathNodeType_Map[(int)(XmlNodeType.Notation)] = -1;
xmlNodeType_To_XpathNodeType_Map[(int)(XmlNodeType.Whitespace)] = (int)XPathNodeType.Whitespace;
xmlNodeType_To_XpathNodeType_Map[(int)(XmlNodeType.SignificantWhitespace)] = (int)XPathNodeType.SignificantWhitespace;
xmlNodeType_To_XpathNodeType_Map[(int)(XmlNodeType.EndElement)] = -1;
xmlNodeType_To_XpathNodeType_Map[(int)(XmlNodeType.EndEntity)] = -1;
xmlNodeType_To_XpathNodeType_Map[(int)(XmlNodeType.XmlDeclaration)] = -1;
// xmlNodeType_To_XpathNodeType_Map[(int)(XmlNodeType.All)] = -1;
}
private XPathNodeType DecideXPNodeTypeForTextNodes( XmlNode node ) {
//the function can only be called on text like nodes.
Debug.Assert( XmlDataDocument.IsTextNode( node.NodeType ) );
XPathNodeType xnt = XPathNodeType.Whitespace;
while( node != null ) {
switch( node.NodeType ) {
case XmlNodeType.Whitespace :
break;
case XmlNodeType.SignificantWhitespace :
xnt = XPathNodeType.SignificantWhitespace;
break;
case XmlNodeType.Text :
case XmlNodeType.CDATA :
return XPathNodeType.Text;
default :
return xnt;
}
node = this._doc.SafeNextSibling(node);
}
return xnt;
}
private XPathNodeType ConvertNodeType( XmlNode node ) {
int xnt = -1;
if ( XmlDataDocument.IsTextNode( node.NodeType ) )
return DecideXPNodeTypeForTextNodes( node );
xnt = xmlNodeType_To_XpathNodeType_Map[(int)(node.NodeType)];
if ( xnt == (int) XPathNodeType.Attribute ) {
if ( node.NamespaceURI == s_strReservedXmlns )
return XPathNodeType.Namespace;
else
return XPathNodeType.Attribute;
}
Debug.Assert( xnt != -1 );
return (XPathNodeType)xnt;
}
private bool IsNamespaceNode( XmlNodeType nt, string ns ) {
if ( nt == XmlNodeType.Attribute && ns == s_strReservedXmlns )
return true;
return false;
}
//when the constructor is called, the node has to be a valid XPath node at the valid location ( for example, the first
//text/WS/SWS/CData nodes of a series continuous text-like nodes.
internal XPathNodePointer( DataDocumentXPathNavigator owner, XmlDataDocument doc, XmlNode node )
: this ( owner, doc, node, null, false, null ){
}
internal XPathNodePointer( DataDocumentXPathNavigator owner, XPathNodePointer pointer )
: this ( owner, pointer._doc, pointer._node, pointer._column, pointer._fOnValue, pointer._parentOfNS ) {
}
private XPathNodePointer( DataDocumentXPathNavigator owner, XmlDataDocument doc, XmlNode node, DataColumn c, bool bOnValue, XmlBoundElement parentOfNS ) {
Debug.Assert( owner != null );
this._owner = new WeakReference( owner );
this._doc = doc;
this._node = node;
this._column = c;
this._fOnValue = bOnValue;
this._parentOfNS = parentOfNS;
// Add this pointer to the document so it will be updated each time region changes it's foliation state.
this._doc.AddPointer( (IXmlDataVirtualNode)this );
_bNeedFoliate = false;
AssertValid();
}
internal XPathNodePointer Clone( DataDocumentXPathNavigator owner ){
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:Clone");
RealFoliate();
return new XPathNodePointer( owner, this ) ;
}
internal bool IsEmptyElement {
get {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:IsEmptyElement");
AssertValid();
if (_node != null && _column == null) {
if (_node.NodeType == XmlNodeType.Element) {
return((XmlElement)_node).IsEmpty;
}
}
return false;
}
}
internal XPathNodeType NodeType {
get {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:NodeType");
RealFoliate();
AssertValid();
if (this._node == null) {
return XPathNodeType.All;
}
else if (this._column == null) {
return ConvertNodeType(this._node);
}
else if (this._fOnValue) {
return XPathNodeType.Text;
}
else if (this._column.ColumnMapping == MappingType.Attribute) {
if ( this._column.Namespace == s_strReservedXmlns )
return XPathNodeType.Namespace;
else
return XPathNodeType.Attribute;
}
else //
return XPathNodeType.Element;
}
}
Imported Upstream version 5.4.0.167 Former-commit-id: 5624ac747d633e885131e8349322922b6a59baaa
2017-08-21 15:34:15 +00:00
//Microsoft: From CodeReview: Perf: We should have another array similar w/
Imported Upstream version 4.6.0.125 Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4
2016-08-03 10:59:49 +00:00
// xmlNodeType_To_XpathNodeType_Map that will return String.Empty for everything but the element and
// attribute case.
internal string LocalName {
get {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:LocalName");
RealFoliate();
AssertValid();
if (this._node == null) {
return string.Empty;
}
else if (this._column == null) {
XmlNodeType nt = this._node.NodeType;
if ( IsNamespaceNode( nt, this._node.NamespaceURI ) && this._node.LocalName == s_strXmlNS )
return string.Empty;
if ( nt == XmlNodeType.Element || nt == XmlNodeType.Attribute || nt == XmlNodeType.ProcessingInstruction )
return _node.LocalName;
return string.Empty;
}
else if (this._fOnValue) {
return String.Empty;
}
else //when column is not null
return _doc.NameTable.Add(_column.EncodedColumnName);
}
}
//note that, we've have lost the prefix in this senario ( defoliation will toss prefix away. )
internal string Name {
get {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:Name");
RealFoliate();
AssertValid();
if (this._node == null) {
return string.Empty;
}
else if (this._column == null) {
XmlNodeType nt = this._node.NodeType;
if ( IsNamespaceNode( nt, this._node.NamespaceURI ) ) {
if ( this._node.LocalName == s_strXmlNS )
return string.Empty;
else
return this._node.LocalName;
}
if ( nt == XmlNodeType.Element || nt == XmlNodeType.Attribute || nt == XmlNodeType.ProcessingInstruction )
return _node.Name;
return string.Empty;
}
else if (this._fOnValue) {
return String.Empty;
}
else { //when column is not null
//we've lost prefix in this senario.
return _doc.NameTable.Add(_column.EncodedColumnName);
}
}
}
internal string NamespaceURI {
get {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:NamespaceURI");
RealFoliate();
AssertValid();
if (this._node == null) {
return string.Empty;
}
else if (this._column == null) {
XPathNodeType xnt = ConvertNodeType( this._node );
if ( xnt == XPathNodeType.Element || xnt == XPathNodeType.Root || xnt == XPathNodeType.Attribute )
return _node.NamespaceURI;
return string.Empty;
}
else if (this._fOnValue) {
return string.Empty;
}
else { //When column is not null
if ( _column.Namespace == s_strReservedXmlns )
//namespace nodes has empty string as namespaceURI
return string.Empty;
return _doc.NameTable.Add(_column.Namespace);
}
}
}
//
internal string Prefix {
get {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:Prefix");
RealFoliate();
AssertValid();
if (this._node == null) {
return string.Empty;
}
else if (this._column == null) {
if ( IsNamespaceNode( this._node.NodeType, this._node.NamespaceURI ) )
return string.Empty;
return _node.Prefix;
}
return string.Empty;
}
}
internal string Value {
get {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:Value");
RealFoliate();
AssertValid();
if (this._node == null)
return null;
else if (this._column == null) {
string strRet = this._node.Value;
if ( XmlDataDocument.IsTextNode( this._node.NodeType ) ) {
//concatenate adjacent textlike nodes
XmlNode parent = this._node.ParentNode;
if ( parent == null )
return strRet;
XmlNode n = _doc.SafeNextSibling(this._node);
while ( n != null && XmlDataDocument.IsTextNode( n.NodeType ) ) {
strRet += n.Value;
n = _doc.SafeNextSibling(n);
}
}
return strRet;
}
else if (this._column.ColumnMapping == MappingType.Attribute || this._fOnValue) {
DataRow row = this.Row;
DataRowVersion rowVersion = ( row.RowState == DataRowState.Detached ) ? DataRowVersion.Proposed : DataRowVersion.Current;
object value = row[ this._column, rowVersion ];
if ( ! Convert.IsDBNull( value ) )
return this._column.ConvertObjectToXml( value );
return null;
}
else
//
return null;
}
}
internal string InnerText {
get {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:InnerText");
RealFoliate();
AssertValid();
if (this._node == null) {
return string.Empty;
}
else if (this._column == null) {
//
if ( this._node.NodeType == XmlNodeType.Document ) {
//document node's region should always be uncompressed
XmlElement rootElem = ((XmlDocument)this._node).DocumentElement;
if ( rootElem != null )
return rootElem.InnerText;
return string.Empty;
}
else
return this._node.InnerText;
}
else {
DataRow row = this.Row;
DataRowVersion rowVersion = ( row.RowState == DataRowState.Detached ) ? DataRowVersion.Proposed : DataRowVersion.Current;
object value = row[ this._column, rowVersion ];
if ( ! Convert.IsDBNull( value ) )
return this._column.ConvertObjectToXml( value );
return string.Empty;
}
}
}
internal String BaseURI {
get {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:BaseURI");
RealFoliate();
if ( this._node != null )
return this._node.BaseURI;
return String.Empty;
}
}
internal String XmlLang {
get {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:XmlLang");
RealFoliate();
XmlNode curNode = this._node;
XmlBoundElement curBoundElem = null;
object colVal = null;
while ( curNode != null ) {
//
curBoundElem = curNode as XmlBoundElement;
if ( curBoundElem != null ) {
//this._doc.Foliate( curBoundElem, ElementState.WeakFoliation );
if ( curBoundElem.ElementState == ElementState.Defoliated ) {
//if not foliated, going through the columns to get the xml:lang
DataRow row = curBoundElem.Row;
foreach( DataColumn col in row.Table.Columns ) {
if ( col.Prefix == "xml" && col.EncodedColumnName == "lang" ) {
colVal = row[col];
if ( colVal == DBNull.Value )
break; //goto its ancesstors
return (String) colVal;
}
}
}
else {
//if folicated, get the attribute directly
if ( curBoundElem.HasAttribute( "xml:lang" ) )
return curBoundElem.GetAttribute( "xml:lang" );
}
}
if ( curNode.NodeType == XmlNodeType.Attribute )
curNode = ((XmlAttribute)curNode).OwnerElement;
else
curNode = curNode.ParentNode;
}
return String.Empty;
}
}
private XmlBoundElement GetRowElement() {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:GetRowElement()");
//AssertValid();
XmlBoundElement rowElem;
if ( this._column != null ) {
rowElem = this._node as XmlBoundElement;
Debug.Assert( rowElem != null );
Debug.Assert( rowElem.Row != null );
return rowElem;
}
_doc.Mapper.GetRegion( this._node, out rowElem );
return rowElem;
}
//
private DataRow Row {
get {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:Row");
//AssertValid();
XmlBoundElement rowElem = GetRowElement();
if ( rowElem == null )
return null;
Debug.Assert( rowElem.Row != null );
return rowElem.Row;
}
}
internal bool MoveTo( XPathNodePointer pointer ) {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:MoveTo(pointer)");
AssertValid();
if ( this._doc != pointer._doc )
return false;
/*
XmlDataDocument docOld = this._doc;
XmlDataDocument docNew = pointer._doc;
if ( docNew != docOld ) {
this._doc.RemovePointer( this );
this._doc = pointer._doc;
this._doc.AddPointer( this );
}
*/
this._node = pointer._node;
this._column = pointer._column;
this._fOnValue = pointer._fOnValue;
this._bNeedFoliate = pointer._bNeedFoliate;
AssertValid();
return true;
}
private void MoveTo( XmlNode node ) {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:MoveTo(node)");
//AssertValid();
// Should not move outside of this document
Debug.Assert( node == this._doc || node.OwnerDocument == this._doc );
this._node = node;
this._column = null;
this._fOnValue = false;
//AssertValid();
}
private void MoveTo( XmlNode node, DataColumn column, bool _fOnValue ) {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:MoveTo(node, column, fOnValue)");
//AssertValid();
// Should not move outside of this document
Debug.Assert( node == this._doc || node.OwnerDocument == this._doc );
this._node = node;
this._column = column;
this._fOnValue = _fOnValue;
//AssertValid();
}
private bool IsFoliated( XmlNode node ) {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:IsFoliated(node)");
//AssertValid();
if (node != null && node is XmlBoundElement)
return((XmlBoundElement)node).IsFoliated;
return true;
}
private int ColumnCount( DataRow row, bool fAttribute ) {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:ColumnCount(row,fAttribute)");
DataColumn c = null;
int count = 0;
while ((c = NextColumn( row, c, fAttribute )) != null) {
if ( c.Namespace != s_strReservedXmlns )
count++;
}
return count;
}
internal int AttributeCount {
get {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:AttributeCount");
RealFoliate();
AssertValid();
if (_node != null) {
if (_column == null && _node.NodeType == XmlNodeType.Element) {
if (!IsFoliated( _node ))
return ColumnCount( Row, true );
else {
int nc = 0;
foreach ( XmlAttribute attr in _node.Attributes ) {
if ( attr.NamespaceURI != s_strReservedXmlns )
nc++;
}
return nc;
}
}
}
return 0;
}
}
internal DataColumn NextColumn( DataRow row, DataColumn col, bool fAttribute ) {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:NextColumn(row,col,fAttribute)");
if (row.RowState == DataRowState.Deleted)
return null;
DataTable table = row.Table;
DataColumnCollection columns = table.Columns;
int iColumn = (col != null) ? col.Ordinal + 1 : 0;
int cColumns = columns.Count;
DataRowVersion rowVersion = ( row.RowState == DataRowState.Detached ) ? DataRowVersion.Proposed : DataRowVersion.Current;
for (; iColumn < cColumns; iColumn++) {
DataColumn c = columns[iColumn];
if (!_doc.IsNotMapped( c ) && (c.ColumnMapping == MappingType.Attribute) == fAttribute && ! Convert.IsDBNull( row[c, rowVersion] ) )
return c;
}
return null;
}
internal DataColumn PreviousColumn( DataRow row, DataColumn col, bool fAttribute ) {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:PreviousColumn(row,col,fAttribute)");
if (row.RowState == DataRowState.Deleted)
return null;
DataTable table = row.Table;
DataColumnCollection columns = table.Columns;
int iColumn = (col != null) ? col.Ordinal - 1 : columns.Count - 1;
int cColumns = columns.Count;
DataRowVersion rowVersion = ( row.RowState == DataRowState.Detached ) ? DataRowVersion.Proposed : DataRowVersion.Current;
for (; iColumn >= 0; iColumn--) {
DataColumn c = columns[iColumn];
if (!_doc.IsNotMapped( c ) && (c.ColumnMapping == MappingType.Attribute) == fAttribute && !Convert.IsDBNull( row[c, rowVersion] ) )
return c;
}
return null;
}
internal bool MoveToAttribute( string localName, string namespaceURI ) {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:MoveToAttribute(localName, namespaceURI)");
RealFoliate();
AssertValid();
if ( namespaceURI == s_strReservedXmlns )
return false;
if (_node != null) {
//_column.ColumnMapping checkin below is not really needed since the pointer should be pointing at the node before this
// function should even be called ( there is always a call MoveToOwnerElement() before MoveToAttribute(..)
if ((_column == null || _column.ColumnMapping == MappingType.Attribute) && _node.NodeType == XmlNodeType.Element) {
if (!IsFoliated( _node )) {
DataColumn c = null;
while ((c = NextColumn( Row, c, true )) != null) {
if (c.EncodedColumnName == localName && c.Namespace == namespaceURI) {
MoveTo( _node, c, false );
return true;
}
}
}
else {
Debug.Assert( _node.Attributes != null );
XmlNode n = _node.Attributes.GetNamedItem(localName, namespaceURI);
if (n != null) {
MoveTo( n, null, false );
return true;
}
}
}
}
return false;
}
internal bool MoveToNextAttribute( bool bFirst ) {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:MoveToNextAttribute(bFirst)");
//
RealFoliate();
AssertValid();
if (_node != null) {
if ( bFirst && ( _column != null || _node.NodeType != XmlNodeType.Element ) )
return false;
if ( !bFirst ) {
if ( _column != null && _column.ColumnMapping != MappingType.Attribute )
return false;
if ( _column == null && _node.NodeType != XmlNodeType.Attribute )
return false;
}
if ( !IsFoliated( _node ) ) {
DataColumn c = _column;
while ( ( c = NextColumn( Row, c, true ) ) != null ) {
if ( c.Namespace != s_strReservedXmlns ) {
MoveTo( _node, c, false );
return true;
}
}
return false;
}
else {
if ( bFirst ) {
XmlAttributeCollection attrs = _node.Attributes;
foreach ( XmlAttribute attr in attrs ) {
if ( attr.NamespaceURI != s_strReservedXmlns ) {
MoveTo( attr, null, false );
return true;
}
}
}
else {
XmlAttributeCollection attrs = ((XmlAttribute)_node).OwnerElement.Attributes;
bool bFound = false;
foreach ( XmlAttribute attr in attrs ) {
if ( bFound && attr.NamespaceURI != s_strReservedXmlns ) {
MoveTo( attr, null, false );
return true;
}
if ( attr == _node )
bFound = true;
}
}
}
}
return false;
}
private bool IsValidChild( XmlNode parent, XmlNode child ) {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:IsValidChild(parent,child)");
int xntChildInt = xmlNodeType_To_XpathNodeType_Map[(int)(child.NodeType)];
if ( xntChildInt == -1 )
return false;
int xntInt = xmlNodeType_To_XpathNodeType_Map[(int)(parent.NodeType)];
Debug.Assert( xntInt != -1 );
switch ( xntInt ) {
case (int)XPathNodeType.Root:
return ( xntChildInt == (int)XPathNodeType.Element ||
xntChildInt == (int)XPathNodeType.Comment ||
xntChildInt == (int)XPathNodeType.ProcessingInstruction );
case (int)XPathNodeType.Element:
return ( xntChildInt == (int)XPathNodeType.Element ||
xntChildInt == (int)XPathNodeType.Text ||
xntChildInt == (int)XPathNodeType.Comment ||
xntChildInt == (int)XPathNodeType.Whitespace ||
xntChildInt == (int)XPathNodeType.SignificantWhitespace ||
xntChildInt == (int)XPathNodeType.ProcessingInstruction );
default :
return false;
}
}
private bool IsValidChild( XmlNode parent, DataColumn c ) {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:IsValidChild(parent,c)");
int xntInt = xmlNodeType_To_XpathNodeType_Map[(int)(parent.NodeType)];
Debug.Assert( xntInt != -1 );
switch ( xntInt ) {
case (int)XPathNodeType.Root:
return c.ColumnMapping == MappingType.Element;
case (int)XPathNodeType.Element:
return ( c.ColumnMapping == MappingType.Element || c.ColumnMapping == MappingType.SimpleContent );
default :
return false;
}
}
internal bool MoveToNextSibling() {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:MoveToNextSibling()");
RealFoliate();
AssertValid();
if (_node != null) {
if ( _column != null ) {
if ( _fOnValue ) {
// _fOnValue could be true only when the column is mapped as simplecontent or element
Debug.Assert( _column.ColumnMapping != MappingType.Attribute && _column.ColumnMapping != MappingType.Hidden );
return false;
}
DataRow curRow = Row;
DataColumn c = NextColumn( curRow, _column, false );
while ( c != null ) {
if ( IsValidChild( _node, c ) ) {
MoveTo( this._node, c, _doc.IsTextOnly(c));
return true;
}
c = NextColumn( curRow, c, false );
}
XmlNode n = _doc.SafeFirstChild( _node );
if (n != null) {
MoveTo( n );
return true;
}
}
else {
XmlNode n = _node;
XmlNode parent = _node.ParentNode;
if ( parent == null )
return false;
bool bTextLike = XmlDataDocument.IsTextNode( _node.NodeType );
do {
do {
n = _doc.SafeNextSibling(n);
} while ( n != null && bTextLike && XmlDataDocument.IsTextNode( n.NodeType ));
} while ( n != null && !IsValidChild(parent, n) );
if (n != null) {
MoveTo(n);
return true;
}
}
}
return false;
}
internal bool MoveToPreviousSibling() {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:MoveToPreviousSibling()");
RealFoliate();
AssertValid();
if (_node != null) {
if (_column != null) {
if (_fOnValue)
return false;
DataRow curRow = Row;
DataColumn c = PreviousColumn( curRow, _column, false );
while ( c != null ) {
if ( IsValidChild(_node,c)) {
MoveTo( _node, c, _doc.IsTextOnly(c) );
return true;
}
c = PreviousColumn( curRow, c , false );
}
}
else {
XmlNode n = _node;
XmlNode parent = _node.ParentNode;
if ( parent == null )
return false;
bool bTextLike = XmlDataDocument.IsTextNode( _node.NodeType );
do {
do {
n = _doc.SafePreviousSibling( n );
} while ( n != null && bTextLike && XmlDataDocument.IsTextNode( n.NodeType ) );
} while ( n != null && !IsValidChild(parent, n) );
if (n != null) {
MoveTo(n);
return true;
}
if (!IsFoliated( parent ) && (parent is XmlBoundElement)) {
DataRow row = ((XmlBoundElement)parent).Row;
if (row != null) {
DataColumn c = PreviousColumn( row, null, false );
if (c != null) {
MoveTo( parent, c, _doc.IsTextOnly(c) );
return true;
}
}
}
}
}
return false;
}
internal bool MoveToFirst() {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:MoveToFirst()");
RealFoliate();
AssertValid();
if (_node != null) {
DataRow curRow = null;
XmlNode parent = null;
if (_column != null) {
curRow = Row;
parent = _node;
}
else {
parent = _node.ParentNode;
if ( parent == null )
return false;
if ( !IsFoliated( parent ) && (parent is XmlBoundElement) )
curRow = ((XmlBoundElement)parent).Row;
}
//first check with the columns in the row
if ( curRow != null ) {
DataColumn c = NextColumn( curRow, null, false );
while ( c != null ) {
if ( IsValidChild( _node, c ) ) {
MoveTo( _node, c, _doc.IsTextOnly( c ) );
return true;
}
c = NextColumn( curRow, c, false );
}
}
//didn't find a valid column or maybe already Foliated, go through its children nodes
XmlNode n = _doc.SafeFirstChild( parent );
while ( n != null ) {
if ( IsValidChild( parent, n ) ) {
MoveTo( n );
return true;
}
n = _doc.SafeNextSibling( n );
}
}
return false;
}
internal bool HasChildren {
get {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:HasChildren");
RealFoliate();
AssertValid();
if (_node == null)
return false;
if (_column != null) {
if ( _column.ColumnMapping == MappingType.Attribute || _column.ColumnMapping == MappingType.Hidden )
return false;
return !_fOnValue;
}
if (!IsFoliated( _node )) {
// find virtual column elements first
DataRow curRow = Row;
DataColumn c = NextColumn( curRow, null, false );
while ( c != null ) {
if ( IsValidChild( _node, c) )
return true;
c = NextColumn( curRow, c, false );
}
}
// look for anything
XmlNode n = _doc.SafeFirstChild( _node );
while ( n != null ) {
if ( IsValidChild( _node, n ) )
return true;
n = _doc.SafeNextSibling( n );
}
return false;
}
}
internal bool MoveToFirstChild() {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:MoveToFirstChild()");
RealFoliate();
AssertValid();
if (_node == null)
return false;
if (_column != null) {
if ( _column.ColumnMapping == MappingType.Attribute || _column.ColumnMapping == MappingType.Hidden )
return false;
if (_fOnValue) //text node has no children to move to
return false;
_fOnValue = true;
return true;
}
if (!IsFoliated( _node )) {
// find virtual column elements first
DataRow curRow = Row;
DataColumn c = NextColumn( curRow, null, false );
while ( c != null ) {
if ( IsValidChild( _node, c) ) {
MoveTo( _node, c, _doc.IsTextOnly(c) );
return true;
}
c = NextColumn( curRow, c, false );
}
}
// look for anything
XmlNode n = _doc.SafeFirstChild( _node );
while ( n != null ) {
if ( IsValidChild( _node, n ) ) {
MoveTo(n);
return true;
}
n = _doc.SafeNextSibling( n );
}
return false;
}
//this version of MoveToParent will consider Attribute type position and move to its owner element
//
internal bool MoveToParent() {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:MoveToParent()");
RealFoliate();
AssertValid();
if ( NodeType == XPathNodeType.Namespace ) {
MoveTo( _parentOfNS );
return true;
}
if (_node != null) {
if (_column != null) {
if (_fOnValue && !_doc.IsTextOnly(_column)) {
MoveTo( _node, _column, false );
return true;
}
MoveTo( _node, null, false );
return true;
}
else {
XmlNode n = null;
if ( _node.NodeType == XmlNodeType.Attribute )
n = ((XmlAttribute)_node).OwnerElement;
else
n = _node.ParentNode;
if (n != null) {
MoveTo(n);
return true;
}
}
}
return false;
}
private XmlNode GetParent( XmlNode node ) {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:GetParent(node)");
XPathNodeType xnt = ConvertNodeType( node );
if ( xnt == XPathNodeType.Namespace ) {
Debug.Assert( _parentOfNS != null );
return _parentOfNS;
}
if ( xnt == XPathNodeType.Attribute )
return ((XmlAttribute)node).OwnerElement;
return node.ParentNode;
}
internal void MoveToRoot() {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:MoveToRoot()");
XmlNode node = this._node;
XmlNode parent = this._node;
while ( parent != null ) {
node = parent;
parent = GetParent(parent);
}
this._node = node;
this._column = null;
this._fOnValue = false;
AssertValid();
}
internal bool IsSamePosition( XPathNodePointer pointer ) {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:IsSamePosition(pointer)");
RealFoliate();
pointer.RealFoliate();
AssertValid();
pointer.AssertValid();
if (_column == null && pointer._column == null)
return ( pointer._node == this._node && pointer._parentOfNS == this._parentOfNS );
return ( pointer._doc == this._doc
&& pointer._node == this._node
&& pointer._column == this._column
&& pointer._fOnValue == this._fOnValue
&& pointer._parentOfNS == this._parentOfNS );
}
private XmlNodeOrder CompareNamespacePosition( XPathNodePointer other ) {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:CompareNamespacePostion(other)");
XPathNodePointer xp1 = this.Clone((DataDocumentXPathNavigator)(this._owner.Target));
XPathNodePointer xp2 = other.Clone((DataDocumentXPathNavigator)(other._owner.Target));
while ( xp1.MoveToNextNamespace(XPathNamespaceScope.All) ) {
if ( xp1.IsSamePosition( other ) )
return XmlNodeOrder.Before;
}
return XmlNodeOrder.After;
}
private static XmlNode GetRoot( XmlNode node, ref int depth ) {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:GetRoot(node, depth)");
depth = 0;
XmlNode curNode = node;
XmlNode parent = ( ( curNode.NodeType == XmlNodeType.Attribute ) ? ( ((XmlAttribute)curNode).OwnerElement ) : ( curNode.ParentNode ) );
for ( ; parent != null; depth++ ) {
curNode = parent;
parent = curNode.ParentNode; // no need to check for attribute since navigator can't be built on its children or navigate to its children
}
return curNode;
}
internal XmlNodeOrder ComparePosition( XPathNodePointer other ) {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:ComparePosition(other)");
RealFoliate();
other.RealFoliate();
Debug.Assert( other != null );
if ( IsSamePosition( other ) )
return XmlNodeOrder.Same;
XmlNode curNode1 = null, curNode2 = null;
//deal with namespace node first
if ( this.NodeType == XPathNodeType.Namespace && other.NodeType == XPathNodeType.Namespace ) {
if ( this._parentOfNS == other._parentOfNS )
return this.CompareNamespacePosition( other );
//if not from the same parent
curNode1 = this._parentOfNS;
curNode2 = other._parentOfNS;
}
else if ( this.NodeType == XPathNodeType.Namespace ) {
Debug.Assert( other.NodeType != XPathNodeType.Namespace );
if ( this._parentOfNS == other._node ) {
//from the same region, NS nodes come before all other nodes
if ( other._column == null )
return XmlNodeOrder.After;
else
return XmlNodeOrder.Before;
}
//if not from the same region
curNode1 = this._parentOfNS;
curNode2 = other._node;
}
else if ( other.NodeType == XPathNodeType.Namespace ) {
Debug.Assert( this.NodeType != XPathNodeType.Namespace );
if ( this._node == other._parentOfNS ) {
//from the same region
if ( this._column == null )
return XmlNodeOrder.Before;
else
return XmlNodeOrder.After;
}
//if not from the same region
curNode1 = this._node;
curNode2 = other._parentOfNS;
}
else {
if ( this._node == other._node ) {
//compare within the same region
if ( this._column == other._column ) {
//one is the children of the other
Debug.Assert( this._fOnValue != other._fOnValue );
if ( this._fOnValue )
return XmlNodeOrder.After;
else
return XmlNodeOrder.Before;
}
else {
Debug.Assert( this.Row == other.Row ); //in the same row
if ( this._column == null )
return XmlNodeOrder.Before;
else if ( other._column == null )
return XmlNodeOrder.After;
else if ( this._column.Ordinal < other._column.Ordinal )
return XmlNodeOrder.Before;
else
return XmlNodeOrder.After;
}
}
curNode1 = this._node;
curNode2 = other._node;
}
Debug.Assert( curNode1 != null );
Debug.Assert( curNode2 != null );
if (curNode1 == null || curNode2 == null) {
return XmlNodeOrder.Unknown;
}
int depth1 = -1, depth2 = -1;
XmlNode root1 = XPathNodePointer.GetRoot( curNode1, ref depth1 );
XmlNode root2 = XPathNodePointer.GetRoot( curNode2, ref depth2 );
if ( root1 != root2 )
return XmlNodeOrder.Unknown;
if ( depth1 > depth2 ) {
while ( curNode1 != null && depth1 > depth2 ) {
curNode1 = ( ( curNode1.NodeType == XmlNodeType.Attribute ) ? ( ((XmlAttribute)curNode1).OwnerElement ) : ( curNode1.ParentNode ) );
depth1--;
}
if ( curNode1 == curNode2 )
return XmlNodeOrder.After;
}
else if ( depth2 > depth1 ) {
while ( curNode2 != null && depth2 > depth1 ) {
curNode2 = ( ( curNode2.NodeType == XmlNodeType.Attribute ) ? ( ((XmlAttribute)curNode2).OwnerElement ) : ( curNode2.ParentNode ) );
depth2--;
}
if ( curNode1 == curNode2 )
return XmlNodeOrder.Before;
}
XmlNode parent1 = GetParent(curNode1);
XmlNode parent2 = GetParent(curNode2);
XmlNode nextNode = null;
while ( parent1 != null && parent2 != null ) {
if ( parent1 == parent2 ) {
while (curNode1 != null ) {
nextNode = curNode1.NextSibling;
if ( nextNode == curNode2 )
return XmlNodeOrder.Before;
curNode1 = nextNode;
}
return XmlNodeOrder.After;
}
curNode1 = parent1;
curNode2 = parent2;
parent1 = curNode1.ParentNode;
parent2 = curNode2.ParentNode;
}
//logically, we shouldn't reach here
Debug.Assert( false );
return XmlNodeOrder.Unknown;
}
internal XmlNode Node {
get {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:Node");
RealFoliate();
AssertValid();
if ( this._node == null )
return null;
XmlBoundElement rowElem = GetRowElement();
if ( rowElem != null ) {
//lock ( this._doc.pointers ) {
bool wasFoliationEnabled = this._doc.IsFoliationEnabled;
this._doc.IsFoliationEnabled = true;
this._doc.Foliate( rowElem, ElementState.StrongFoliation );
this._doc.IsFoliationEnabled = wasFoliationEnabled;
//}
}
RealFoliate();
AssertValid();
return this._node;
}
}
bool IXmlDataVirtualNode.IsOnNode( XmlNode nodeToCheck ) {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:IsOnNode(nodeToCheck)");
RealFoliate();
return nodeToCheck == this._node;
}
bool IXmlDataVirtualNode.IsOnColumn( DataColumn col ) {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:IsOnColumn(col)");
RealFoliate();
return col == this._column;
}
void IXmlDataVirtualNode.OnFoliated( XmlNode foliatedNode ) {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:OnFoliated(foliatedNode)");
// update the pointer if the element node has been foliated
if (_node == foliatedNode) {
// if already on this node, nothing to do!
if (_column == null)
return;
_bNeedFoliate = true;
}
}
private void RealFoliate() {
if ( !_bNeedFoliate )
return;
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:RealFoliate()");
_bNeedFoliate = false;
Debug.Assert( this._column != null );
XmlNode n = null;
if (_doc.IsTextOnly( _column ))
n = _node.FirstChild;
else {
if (_column.ColumnMapping == MappingType.Attribute) {
n = _node.Attributes.GetNamedItem( _column.EncodedColumnName, _column.Namespace );
}
else {
for (n = _node.FirstChild; n != null; n = n.NextSibling) {
if (n.LocalName == _column.EncodedColumnName && n.NamespaceURI == _column.Namespace)
break;
}
}
if (n != null && _fOnValue)
n = n.FirstChild;
}
if (n == null)
throw new InvalidOperationException(Res.GetString(Res.DataDom_Foliation));
// Cannot use MoveTo( n ); b/c the initial state for MoveTo is invalid (region is foliated but this is not)
this._node = n;
this._column = null;
this._fOnValue = false;
AssertValid();
_bNeedFoliate = false;
}
//The function only helps to find out if there is a namespace declaration of given name is defined on the given node
//It will not check the accestors of the given node.
private string GetNamespace( XmlBoundElement be, string name ) {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:GetNamespace(be,name)");
if ( be == null )
return null;
XmlAttribute attr = null;
if ( be.IsFoliated ) {
attr = be.GetAttributeNode ( name, s_strReservedXmlns );
if ( attr != null )
return attr.Value;
else
return null;
}
else { //defoliated so that we need to search through its column
DataRow curRow = be.Row;
if ( curRow == null )
return null;
//going through its attribute columns
DataColumn curCol = PreviousColumn( curRow, null, true );
while ( curCol != null ) {
if ( curCol.Namespace == s_strReservedXmlns ) {
//
DataRowVersion rowVersion = ( curRow.RowState == DataRowState.Detached ) ? DataRowVersion.Proposed : DataRowVersion.Current;
return curCol.ConvertObjectToXml( curRow[curCol,rowVersion] );
}
curCol = PreviousColumn( curRow, curCol, true );
}
return null;
}
}
internal string GetNamespace(string name) {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:GetNamespace(name)");
//we are checking the namespace nodes backwards comparing its normal order in DOM tree
if ( name == "xml" )
return s_strReservedXml;
if ( name == "xmlns" )
return s_strReservedXmlns;
if ( name != null && name.Length == 0 )
name = "xmlns";
RealFoliate();
XmlNode node = _node;
XmlNodeType nt = node.NodeType;
String retVal = null;
while ( node != null ) {
//first identify an element node in the ancestor + itself
while ( node != null && ( ( nt = node.NodeType ) != XmlNodeType.Element ) ) {
if ( nt == XmlNodeType.Attribute )
node = ((XmlAttribute)node).OwnerElement;
else
node = node.ParentNode;
}
//found one -- inside if
if ( node != null ) {
//must be element node
retVal = GetNamespace((XmlBoundElement)node, name);
if ( retVal != null )
return retVal;
//didn't find it, try the next parentnode
node = node.ParentNode;
}
}
//nothing happens, then return string.empty.
return string.Empty;
}
internal bool MoveToNamespace(string name) {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:MoveToNamespace(name)");
_parentOfNS = this._node as XmlBoundElement;
//only need to check with _node, even if _column is not null and its mapping type is element, it can't have attributes
if ( _parentOfNS == null )
return false;
string attrName = name;
if ( attrName == "xmlns" )
attrName = "xmlns:xmlns";
if ( attrName != null && attrName.Length == 0 )
attrName = "xmlns";
RealFoliate();
XmlNode node = this._node;
XmlNodeType nt = node.NodeType;
XmlAttribute attr = null;
XmlBoundElement be = null;
while ( node != null ) {
//check current element node
be = node as XmlBoundElement;
if ( be != null ) {
if ( be.IsFoliated ) {
attr = be.GetAttributeNode ( name, s_strReservedXmlns );
if ( attr != null ) {
MoveTo( attr );
return true;
}
}
else {//defoliated so that we need to search through its column
DataRow curRow = be.Row;
if ( curRow == null )
return false;
//going through its attribute columns
DataColumn curCol = PreviousColumn( curRow, null, true );
while ( curCol != null ) {
if ( curCol.Namespace == s_strReservedXmlns && curCol.ColumnName == name ) {
MoveTo( be, curCol, false );
return true;
}
curCol = PreviousColumn( curRow, curCol, true );
}
}
}
//didn't find it, try the next element anccester.
do {
node = node.ParentNode;
} while ( node != null && node.NodeType != XmlNodeType.Element );
}
//nothing happens, the name doesn't exist as a namespace node.
_parentOfNS = null;
return false;
}
//the function will find the next namespace node on the given bound element starting with the given column or attribte
// wether to use column or attribute depends on if the bound element is folicated or not.
private bool MoveToNextNamespace( XmlBoundElement be, DataColumn col, XmlAttribute curAttr ) {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:MoveToNextNamespace(be,col,curAttr)");
if ( be != null ) {
if ( be.IsFoliated ) {
XmlAttributeCollection attrs = be.Attributes;
XmlAttribute attr = null;
bool bFound = false;
if ( curAttr == null )
bFound = true; //the first namespace will be the one
#if DEBUG
if ( curAttr != null )
Debug.Assert( curAttr.NamespaceURI == s_strReservedXmlns );
#endif
Debug.Assert( attrs!=null );
int attrInd = attrs.Count;
while ( attrInd > 0 ) {
attrInd--;
attr = attrs[attrInd];
if ( bFound && attr.NamespaceURI == s_strReservedXmlns && !DuplicateNS( be, attr.LocalName ) ) {
MoveTo(attr);
return true;
}
if ( attr == curAttr )
bFound = true;
}
}
else {//defoliated so that we need to search through its column
DataRow curRow = be.Row;
if ( curRow == null )
return false;
//going through its attribute columns
DataColumn curCol = PreviousColumn( curRow, col, true );
while ( curCol != null ) {
if ( curCol.Namespace == s_strReservedXmlns && !DuplicateNS( be, curCol.ColumnName ) ) {
MoveTo( be, curCol, false );
return true;
}
curCol = PreviousColumn( curRow, curCol, true );
}
}
}
return false;
}
//Caller( DataDocumentXPathNavigator will make sure that the node is at the right position for this call )
internal bool MoveToFirstNamespace(XPathNamespaceScope namespaceScope) {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:MoveToFirstNamespace(namespaceScope)");
RealFoliate();
_parentOfNS = this._node as XmlBoundElement;
//only need to check with _node, even if _column is not null and its mapping type is element, it can't have attributes
if ( _parentOfNS == null )
return false;
XmlNode node = this._node;
XmlBoundElement be = null;
while ( node != null ) {
be = node as XmlBoundElement;
if ( MoveToNextNamespace( be, null, null ) )
return true;
//didn't find it
if ( namespaceScope == XPathNamespaceScope.Local )
goto labelNoNS;
//try the next element anccestor.
do {
node = node.ParentNode;
} while ( node != null && node.NodeType != XmlNodeType.Element );
}
if ( namespaceScope == XPathNamespaceScope.All ) {
MoveTo( this._doc.attrXml, null, false );
return true;
}
labelNoNS:
//didn't find one namespace node
_parentOfNS = null;
return false;
}
//endElem is on the path from startElem to root is enforced by the caller
private bool DuplicateNS( XmlBoundElement endElem, string lname) {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:DuplicateNS(endElem, lname)");
if ( this._parentOfNS == null || endElem == null )
return false;
XmlBoundElement be = this._parentOfNS;
XmlNode node = null;
while ( be != null && be != endElem ) {
if ( GetNamespace( be, lname ) != null )
return true;
node = (XmlNode)be;
do {
node = node.ParentNode;
} while ( node != null && node.NodeType != XmlNodeType.Element );
be = node as XmlBoundElement;
}
return false;
}
//Caller( DataDocumentXPathNavigator will make sure that the node is at the right position for this call )
internal bool MoveToNextNamespace(XPathNamespaceScope namespaceScope) {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:MoveToNextNamespace(namespaceScope)");
RealFoliate();
Debug.Assert( _parentOfNS != null );
XmlNode node = this._node;
//first check within the same boundelement
if ( this._column != null ) {
Debug.Assert( this._column.Namespace == s_strReservedXmlns );
if ( namespaceScope == XPathNamespaceScope.Local && _parentOfNS != this._node ) //already outside scope
return false;
XmlBoundElement be = this._node as XmlBoundElement;
Debug.Assert( be != null );
DataRow curRow = be.Row;
Debug.Assert( curRow != null );
DataColumn curCol = PreviousColumn( curRow, this._column, true );
while ( curCol != null ) {
if ( curCol.Namespace == s_strReservedXmlns ) {
MoveTo( be, curCol, false );
return true;
}
curCol = PreviousColumn( curRow, curCol, true );
}
//didn't find it in this loop
if ( namespaceScope == XPathNamespaceScope.Local )
return false;
//try its ancesstor
do {
node = node.ParentNode;
} while ( node != null && node.NodeType != XmlNodeType.Element );
}
else if ( this._node.NodeType == XmlNodeType.Attribute ) {
XmlAttribute attr = (XmlAttribute)(this._node);
Debug.Assert( attr != null );
node = attr.OwnerElement;
if ( node == null )
return false;
if ( namespaceScope == XPathNamespaceScope.Local && _parentOfNS != node ) //already outside scope
return false;
if ( MoveToNextNamespace( (XmlBoundElement)node, null, (XmlAttribute)attr ) )
return true;
//didn't find it
if ( namespaceScope == XPathNamespaceScope.Local )
return false;
do {
node = node.ParentNode;
} while ( node != null && node.NodeType != XmlNodeType.Element );
}
// till now, node should be the next accesstor (bound) element of the element parent of current namespace node (attribute or data column)
while ( node != null ) {
//try the namespace attributes from the same element
XmlBoundElement be = node as XmlBoundElement;
if ( MoveToNextNamespace( be, null, null ) )
return true;
//no more namespace attribute under the same element
do {
node = node.ParentNode;
} while ( node != null && node.NodeType == XmlNodeType.Element );
}
//didn't find the next namespace, thus return
if ( namespaceScope == XPathNamespaceScope.All ) {
MoveTo( this._doc.attrXml, null, false );
return true;
}
return false;
}
[System.Diagnostics.Conditional("DEBUG")]
private void AssertValid() {
// This pointer must be int the document list
//RealFoliate();
this._doc.AssertPointerPresent( this );
if ( this._column != null ) {
// We must be on a de-foliated region
XmlBoundElement rowElem = this._node as XmlBoundElement;
Debug.Assert( rowElem != null );
DataRow row = rowElem.Row;
Debug.Assert( row != null );
//ElementState state = rowElem.ElementState;
//Debug.Assert( state == ElementState.Defoliated || _bNeedFoliated, "Region is accessed using column, but it's state is FOLIATED" );
// We cannot be on a column for which the value is DBNull
DataRowVersion rowVersion = ( row.RowState == DataRowState.Detached ) ? DataRowVersion.Proposed : DataRowVersion.Current;
Debug.Assert( ! Convert.IsDBNull( row[ this._column, rowVersion ] ) );
// If we are on the Text column, we should always have _fOnValue == true
Debug.Assert( (this._column.ColumnMapping == MappingType.SimpleContent) ? (this._fOnValue == true) : true );
}
if ( this._column == null )
Debug.Assert( !this._fOnValue );
}
internal XmlDataDocument Document { get { return _doc; } }
bool IXmlDataVirtualNode.IsInUse() {
//Debug.WriteLineIf( XmlTrace.traceXPathNodePointerFunctions.Enabled, "XPathNodePointer:IsInUse()");
return _owner.IsAlive;
}
}
}
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