DataDocumentXPathNavigator.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / NewXml / DataDocumentXPathNavigator.cs / 1 / DataDocumentXPathNavigator.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
// [....]
// [....] 
//----------------------------------------------------------------------------- 
namespace System.Xml {
    using System; 
    using System.Data;
    using System.Collections;
    using System.Text;
    using System.Xml.XPath; 
    using System.Diagnostics;
 
    internal sealed class DataDocumentXPathNavigator: XPathNavigator, IHasXmlNode { 
        private XPathNodePointer    _curNode;           //pointer to remember the current node position
        private XmlDataDocument     _doc;              //pointer to remember the root -- can only be XmlDataDocument for DataDocumentXPathNavigator 
        private XPathNodePointer    _temp;

        internal DataDocumentXPathNavigator( XmlDataDocument doc, XmlNode node ) {
            _curNode = new XPathNodePointer( this, doc, node ); 
            _temp = new XPathNodePointer( this, doc, node );
            _doc = doc; 
        } 

        private DataDocumentXPathNavigator( DataDocumentXPathNavigator other ) { 
            this._curNode = other._curNode.Clone( this );
            this._temp = other._temp.Clone( this );
            this._doc = other._doc;
        } 
        public override XPathNavigator Clone(){
            return new DataDocumentXPathNavigator( this ); 
        } 

        internal XPathNodePointer CurNode { get { return _curNode; } } 
        internal XmlDataDocument Document { get { return _doc; } }

        //Convert will deal with nodeType as Attribute or Namespace nodes
        public override XPathNodeType NodeType { get { return _curNode.NodeType; } } 

        public override string LocalName { get { return _curNode.LocalName; } } 
 
        public override string NamespaceURI { get { return _curNode.NamespaceURI; } }
 
        public override string Name { get { return _curNode.Name; } }

        public override string Prefix { get { return _curNode.Prefix; } }
 
        public override string Value {
            get { 
                XPathNodeType xnt = _curNode.NodeType; 
                if ( xnt == XPathNodeType.Element || xnt == XPathNodeType.Root )
                    return _curNode.InnerText; 
                return _curNode.Value;
            }
        }
 
        public override String BaseURI { get { return _curNode.BaseURI; } }
 
        public override String XmlLang { get { return _curNode.XmlLang; } } 

        public override bool IsEmptyElement { get { return _curNode.IsEmptyElement; } } 

        public override XmlNameTable NameTable { get { return _doc.NameTable; } }

        // Attributes 
        public override bool HasAttributes { get { return _curNode.AttributeCount > 0; } }
 
        public override string GetAttribute( string localName, string namespaceURI ) { 
            if ( _curNode.NodeType != XPathNodeType.Element )
                return string.Empty; //other type of nodes can't have attributes 
            _temp.MoveTo( _curNode );
            if ( _temp.MoveToAttribute( localName, namespaceURI ) )
                return _temp.Value;
            return string.Empty; 
        }
 
//#if SupportNamespaces 

        public override string GetNamespace(string name) { 
            return _curNode.GetNamespace( name );
        }

        public override bool MoveToNamespace(string name) { 
            if ( _curNode.NodeType != XPathNodeType.Element )
                return false; 
            return _curNode.MoveToNamespace( name ); 
        }
 
        public override bool MoveToFirstNamespace(XPathNamespaceScope namespaceScope) {
            if ( _curNode.NodeType != XPathNodeType.Element )
                return false;
            return _curNode.MoveToFirstNamespace(namespaceScope); 
        }
 
        public override bool MoveToNextNamespace(XPathNamespaceScope namespaceScope) { 
            if ( _curNode.NodeType != XPathNodeType.Namespace )
                return false; 
            return _curNode.MoveToNextNamespace(namespaceScope);
        }
//#endif
 
        public override bool MoveToAttribute( string localName, string namespaceURI ) {
            if ( _curNode.NodeType != XPathNodeType.Element ) 
                return false; //other type of nodes can't have attributes 
            return _curNode.MoveToAttribute( localName, namespaceURI );
        } 

        public override bool MoveToFirstAttribute() {
            if ( _curNode.NodeType != XPathNodeType.Element )
                return false; //other type of nodes can't have attributes 
            return _curNode.MoveToNextAttribute(true);
        } 
 
        public override bool MoveToNextAttribute() {
            if ( _curNode.NodeType != XPathNodeType.Attribute ) 
                return false;
            return _curNode.MoveToNextAttribute(false);
        }
 

        // Tree 
        public override bool MoveToNext() { 
            if ( _curNode.NodeType == XPathNodeType.Attribute )
                return false; 
            return _curNode.MoveToNextSibling();
        }

        public override bool MoveToPrevious() { 
            if ( _curNode.NodeType == XPathNodeType.Attribute )
                return false; 
            return _curNode.MoveToPreviousSibling(); 
        }
 
        public override bool MoveToFirst() {
            if ( _curNode.NodeType == XPathNodeType.Attribute )
                return false;
            return _curNode.MoveToFirst(); 
        }
 
        public override bool HasChildren { get { return _curNode.HasChildren; } } 

        public override bool MoveToFirstChild() { 
            return _curNode.MoveToFirstChild();
        }

        public override bool MoveToParent() { 
            return _curNode.MoveToParent();
        } 
 
        public override void MoveToRoot() {
            _curNode.MoveToRoot(); 
        }

        public override bool MoveTo( XPathNavigator other ) {
            if ( other == null ) 
                return false;
            DataDocumentXPathNavigator otherDataDocXPathNav = other as DataDocumentXPathNavigator; 
            if ( otherDataDocXPathNav != null ) { 
                if ( _curNode.MoveTo( otherDataDocXPathNav.CurNode ) ) {
                    _doc = _curNode.Document; 
                    return true;
                }
                else
                    return false; 
            }
            return false; 
        } 

        //doesn't support MoveToId 
        public override bool MoveToId( string id ) {
            return false;
        }
 
        public override bool IsSamePosition( XPathNavigator other ) {
            if ( other == null ) 
                return false; 
            DataDocumentXPathNavigator otherDataDocXPathNav = other as DataDocumentXPathNavigator;
            if ( otherDataDocXPathNav != null ) { 
                if ( this._doc == otherDataDocXPathNav.Document && this._curNode.IsSamePosition(otherDataDocXPathNav.CurNode) )
                    return true;
            }
            return false; 
        }
 
        //the function is only called for XPathNodeList enumerate nodes and 
        // shouldn't be promoted to frequently use because it will cause foliation
        XmlNode IHasXmlNode.GetNode() { return _curNode.Node; } 

        public override XmlNodeOrder ComparePosition( XPathNavigator other ) {
            if ( other == null )
                return XmlNodeOrder.Unknown; // this is what XPathDocument does. // WebData 103403 

            DataDocumentXPathNavigator otherDataDocXPathNav = other as DataDocumentXPathNavigator; 
 
            if ( otherDataDocXPathNav == null || otherDataDocXPathNav.Document != this._doc )
                return XmlNodeOrder.Unknown; 

            return this._curNode.ComparePosition( otherDataDocXPathNav.CurNode );
        }
 
    }
 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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DataDocumentXPathNavigator.cs source code in C# .NET

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