Code:
/ DotNET / DotNET / 8.0 / 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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