TreeIterator.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Data / System / NewXml / TreeIterator.cs / 1305376 / TreeIterator.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
// [....]
//----------------------------------------------------------------------------- 
#pragma warning disable 618 // ignore obsolete warning about XmlDataDocument 
namespace System.Xml {
    using System.Diagnostics; 

    // Iterates over non-attribute nodes
    internal sealed class TreeIterator : BaseTreeIterator {
        private XmlNode         nodeTop; 
        private XmlNode         currentNode;
 
        internal TreeIterator( XmlNode nodeTop ) : base( ((XmlDataDocument)(nodeTop.OwnerDocument)).Mapper ) { 
            Debug.Assert( nodeTop != null );
            this.nodeTop     = nodeTop; 
            this.currentNode = nodeTop;
        }

        internal override void Reset() { 
            currentNode = nodeTop;
        } 
 
        internal override XmlNode CurrentNode {
            get { 
                return currentNode;
            }
        }
 
        internal override bool Next() {
            XmlNode nextNode; 
 
            // Try to move to the first child
            nextNode = currentNode.FirstChild; 

            // No children, try next sibling
            if ( nextNode != null ) {
                currentNode = nextNode; 
                return true;
            } 
            return NextRight(); 
        }
 
        internal override bool NextRight() {
            // Make sure we do not get past the nodeTop if we call NextRight on a just initialized iterator and nodeTop has no children
            if ( currentNode == nodeTop ) {
                currentNode = null; 
                return false;
            } 
 
            XmlNode nextNode = currentNode.NextSibling;
 
            if ( nextNode != null ) {
                currentNode = nextNode;
                return true;
            } 

            // No next sibling, try the first sibling of from the parent chain 
            nextNode = currentNode; 
            while ( nextNode != nodeTop && nextNode.NextSibling == null )
                nextNode = nextNode.ParentNode; 

            if ( nextNode == nodeTop ) {
                currentNode = null;
                return false; 
            }
 
            currentNode = nextNode.NextSibling; 
            Debug.Assert( currentNode != null );
            return true; 
        }
    }
}
 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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