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//------------------------------------------------------------------------------
// <copyright file="ContextQuery.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;
internal class ContextQuery : Query {
protected XPathNavigator contextNode;
public ContextQuery() {
this.count = 0;
}
protected ContextQuery(ContextQuery other) : base(other) {
this.contextNode = other.contextNode; // Don't need to clone here
}
public override void Reset() {
count = 0;
}
public override XPathNavigator Current { get { return contextNode; } }
public override object Evaluate(XPathNodeIterator context) {
contextNode = context.Current; // We don't clone here. Because we never move it.
count = 0;
return this;
}
public override XPathNavigator Advance() {
if (count == 0) {
count = 1;
return contextNode;
}
return null;
}
public override XPathNavigator MatchNode(XPathNavigator current) {
return current;
}
public override XPathNodeIterator Clone() { return new ContextQuery(this); }
public override XPathResultType StaticType { get { return XPathResultType.NodeSet; } }
public override int CurrentPosition { get { return count; } }
public override int Count { get { return 1; } }
public override QueryProps Properties { get { return QueryProps.Merge | QueryProps.Cached | QueryProps.Position | QueryProps.Count; } }
}
}
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