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//------------------------------------------------------------------------------
// <copyright file="followingquery.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 sealed class FollowingQuery : BaseAxisQuery {
private XPathNavigator input;
private XPathNodeIterator iterator;
public FollowingQuery(Query qyInput, string name, string prefix, XPathNodeType typeTest) : base(qyInput, name, prefix, typeTest) {}
private FollowingQuery(FollowingQuery other) : base(other) {
this.input = Clone(other.input);
this.iterator = Clone(other.iterator);
}
public override void Reset() {
iterator = null;
base.Reset();
}
public override XPathNavigator Advance() {
if (iterator == null) {
input = qyInput.Advance();
if (input == null) {
return null;
}
XPathNavigator prev;
do {
prev = input.Clone();
input = qyInput.Advance();
} while (prev.IsDescendant(input));
input = prev;
iterator = XPathEmptyIterator.Instance;
}
while (! iterator.MoveNext()) {
bool matchSelf;
if (input.NodeType == XPathNodeType.Attribute || input.NodeType == XPathNodeType.Namespace) {
input.MoveToParent();
matchSelf = false;
} else {
while (! input.MoveToNext()) {
if (! input.MoveToParent()) {
return null;
}
}
matchSelf = true;
}
if (NameTest) {
iterator = input.SelectDescendants(Name, Namespace, matchSelf);
} else {
iterator = input.SelectDescendants(TypeTest, matchSelf);
}
}
position++;
currentNode = iterator.Current;
return currentNode;
}
public override XPathNodeIterator Clone() { return new FollowingQuery(this); }
}
}
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