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//------------------------------------------------------------------------------
// <copyright file="XPathSelectionIterator.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.Globalization;
// We need this wrapper object to:
// 1. Calculate position
// 2. Protect internal query.Current from user who may call MoveNext().
internal class XPathSelectionIterator : ResetableIterator {
private XPathNavigator nav;
private Query query;
private int position;
internal XPathSelectionIterator(XPathNavigator nav, Query query) {
this.nav = nav.Clone();
this.query = query;
}
protected XPathSelectionIterator(XPathSelectionIterator it) {
this.nav = it.nav.Clone();
this.query = (Query) it.query.Clone();
this.position = it.position;
}
public override void Reset() {
this.query.Reset();
}
public override bool MoveNext() {
XPathNavigator n = query.Advance();
if( n != null ) {
position++;
if (!nav.MoveTo(n)) {
nav = n.Clone();
}
return true;
}
return false;
}
public override int Count { get { return query.Count; } }
public override XPathNavigator Current { get { return nav; } }
public override int CurrentPosition { get { return position; } }
public override XPathNodeIterator Clone() { return new XPathSelectionIterator(this); }
}
}
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