XPathAncestorQuery.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 / Xml / System / Xml / XPath / Internal / XPathAncestorQuery.cs / 1 / XPathAncestorQuery.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;
 
    internal sealed class XPathAncestorQuery : CacheAxisQuery {
        private bool matchSelf; 
 
        public XPathAncestorQuery(Query qyInput, string name, string prefix, XPathNodeType typeTest, bool matchSelf) : base(qyInput, name, prefix, typeTest)  {
            this.matchSelf = matchSelf; 
        }
        private XPathAncestorQuery(XPathAncestorQuery other) : base(other) {
            this.matchSelf = other.matchSelf;
        } 

        public override object Evaluate(XPathNodeIterator context) { 
            base.Evaluate(context); 

            XPathNavigator ancestor = null; 
            XPathNavigator input;
            while ((input = qyInput.Advance()) != null) {
                if (matchSelf) {
                    if (matches(input)) { 
                        if (!Insert(outputBuffer, input)) {
                            // If input is already in output buffer all its ancestors are in a buffer as well. 
                            continue; 
                        }
                    } 
                }
                if (ancestor == null || ! ancestor.MoveTo(input)) {
                    ancestor = input.Clone();
                } 
                while (ancestor.MoveToParent()) {
                    if (matches(ancestor)) { 
                        if (!Insert(outputBuffer, ancestor)) { 
                            // If input is already in output buffer all its ancestors are in a buffer as well.
                            break; 
                        }
                    }
                }
            } 
            return this;
        } 
 
        public override XPathNodeIterator Clone() { return new XPathAncestorQuery(this); }
        public override int CurrentPosition { get { return outputBuffer.Count - count + 1; } } 
        public override QueryProps Properties { get { return base.Properties | QueryProps.Reverse; } }

        public override void PrintQuery(XmlWriter w) {
            w.WriteStartElement(this.GetType().Name); 
            if (matchSelf) {
                w.WriteAttributeString("self", "yes"); 
            } 
            if (NameTest) {
                w.WriteAttributeString("name", Prefix.Length != 0 ? Prefix + ':' + Name : Name); 
            }
            if (TypeTest != XPathNodeType.Element) {
                w.WriteAttributeString("nodeType", TypeTest.ToString());
            } 
            qyInput.PrintQuery(w);
            w.WriteEndElement(); 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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