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//------------------------------------------------------------------------------
// <copyright file="XPathAncestorQuery.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
//------------------------------------------------------------------------------
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();
}
}
}
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