followingsibling.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 / Xml / System / Xml / XPath / Internal / followingsibling.cs / 1305376 / followingsibling.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
//-----------------------------------------------------------------------------
 
namespace MS.Internal.Xml.XPath { 
    using System;
    using System.Xml; 
    using System.Xml.XPath;
    using System.Diagnostics;
    using System.Collections.Generic;
    using StackNav = ClonableStack; 

    internal sealed class FollSiblingQuery : BaseAxisQuery { 
        StackNav              elementStk; 
        List  parentStk;
        XPathNavigator        nextInput; 
 		
        public FollSiblingQuery(Query qyInput, string name, string prefix, XPathNodeType type) : base (qyInput, name, prefix, type) {
            this.elementStk = new StackNav();
            this.parentStk  = new List(); 
        }
        private FollSiblingQuery(FollSiblingQuery other) : base(other) { 
            this.elementStk = other.elementStk.Clone(); 
            this.parentStk = new List(other.parentStk);
            this.nextInput = Clone(other.nextInput); 
        }

        public override void Reset() {
            elementStk.Clear(); 
            parentStk.Clear();
            nextInput = null; 
            base.Reset(); 
        }
 
        private bool Visited(XPathNavigator nav) {
            XPathNavigator parent = nav.Clone();
            parent.MoveToParent();
            for (int i = 0; i < parentStk.Count; i++) { 
                if (parent.IsSamePosition(parentStk[i])) {
                    return true; 
                } 
            }
            parentStk.Add(parent); 
            return false;
        }

        private XPathNavigator FetchInput() { 
            XPathNavigator input;
            do { 
                input = qyInput.Advance(); 
                if (input == null) {
                    return null; 
                }
            } while (Visited(input));
            return input.Clone();
        } 

        public override XPathNavigator Advance() { 
        	while (true) { 
                if (currentNode == null) {
                    if (nextInput == null) { 
                        nextInput = FetchInput(); // This can happen at the begining and at the end
                    }
                    if (elementStk.Count == 0) {
                        if (nextInput == null) { 
                            return null;
                        } 
                        currentNode = nextInput; 
                        nextInput = FetchInput();
                    } else { 
                        currentNode = elementStk.Pop();
                    }
                }
 
                while (currentNode.IsDescendant(nextInput)) {
                    elementStk.Push(currentNode); 
                    currentNode = nextInput; 
                    nextInput = qyInput.Advance();
                    if (nextInput != null) { 
                        nextInput = nextInput.Clone();
                    }
                }
 
				while (currentNode.MoveToNext()) {
				    if (matches(currentNode)) { 
				        position++; 
    				    return currentNode;
 			        } 
			    }
 		        currentNode = null;
 			}
        } // Advance 

        public override XPathNodeIterator Clone() { return new FollSiblingQuery(this); } 
    } 
}

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

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