78 lines
2.6 KiB
C#
78 lines
2.6 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="TreeIterator.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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// <owner current="true" primary="true">Microsoft</owner>
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// <owner current="true" primary="false">Microsoft</owner>
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//------------------------------------------------------------------------------
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#pragma warning disable 618 // ignore obsolete warning about XmlDataDocument
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namespace System.Xml {
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using System.Diagnostics;
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// Iterates over non-attribute nodes
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internal sealed class TreeIterator : BaseTreeIterator {
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private XmlNode nodeTop;
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private XmlNode currentNode;
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internal TreeIterator( XmlNode nodeTop ) : base( ((XmlDataDocument)(nodeTop.OwnerDocument)).Mapper ) {
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Debug.Assert( nodeTop != null );
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this.nodeTop = nodeTop;
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this.currentNode = nodeTop;
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}
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internal override void Reset() {
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currentNode = nodeTop;
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}
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internal override XmlNode CurrentNode {
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get {
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return currentNode;
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}
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}
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internal override bool Next() {
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XmlNode nextNode;
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// Try to move to the first child
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nextNode = currentNode.FirstChild;
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// No children, try next sibling
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if ( nextNode != null ) {
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currentNode = nextNode;
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return true;
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}
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return NextRight();
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}
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internal override bool NextRight() {
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// Make sure we do not get past the nodeTop if we call NextRight on a just initialized iterator and nodeTop has no children
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if ( currentNode == nodeTop ) {
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currentNode = null;
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return false;
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}
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XmlNode nextNode = currentNode.NextSibling;
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if ( nextNode != null ) {
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currentNode = nextNode;
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return true;
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}
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// No next sibling, try the first sibling of from the parent chain
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nextNode = currentNode;
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while ( nextNode != nodeTop && nextNode.NextSibling == null )
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nextNode = nextNode.ParentNode;
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if ( nextNode == nodeTop ) {
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currentNode = null;
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return false;
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}
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currentNode = nextNode.NextSibling;
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Debug.Assert( currentNode != null );
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return true;
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}
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}
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}
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