TreeIterator.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / NewXml / TreeIterator.cs / 1 / TreeIterator.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
// [....]
// [....] 
//----------------------------------------------------------------------------- 
namespace System.Xml {
    using System; 
    using System.Data;
    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.
// Copyright (c) Microsoft Corporation. All rights reserved.

Link Menu

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK