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//------------------------------------------------------------------------------
// <copyright file="ChildrenQuery.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;
using System.Xml.Xsl;
using System.Collections;
internal class ChildrenQuery : BaseAxisQuery {
XPathNodeIterator iterator = XPathEmptyIterator.Instance;
public ChildrenQuery(Query qyInput, string name, string prefix, XPathNodeType type) : base (qyInput, name, prefix, type) {}
protected ChildrenQuery(ChildrenQuery other) : base(other) {
this.iterator = Clone(other.iterator);
}
public override void Reset() {
iterator = XPathEmptyIterator.Instance;
base.Reset();
}
public override XPathNavigator Advance() {
while (!iterator.MoveNext()) {
XPathNavigator input = qyInput.Advance();
if (input == null) {
return null;
}
if (NameTest) {
if (TypeTest == XPathNodeType.ProcessingInstruction) {
iterator = new IteratorFilter(input.SelectChildren(TypeTest), Name);
} else {
iterator = input.SelectChildren(Name, Namespace);
}
} else {
iterator = input.SelectChildren(TypeTest);
}
position = 0;
}
position ++;
currentNode = iterator.Current;
return currentNode;
} // Advance
public sealed override XPathNavigator MatchNode(XPathNavigator context) {
if (context != null) {
if (matches(context)) {
XPathNavigator temp = context.Clone();
if (temp.NodeType != XPathNodeType.Attribute && temp.MoveToParent()) {
return qyInput.MatchNode(temp);
}
return null;
}
}
return null;
}
public override XPathNodeIterator Clone() { return new ChildrenQuery(this); }
}
}
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