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//------------------------------------------------------------------------------
// <copyright file="NamespaceQuery.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;
internal sealed class NamespaceQuery : BaseAxisQuery {
private bool onNamespace;
public NamespaceQuery(Query qyParent, string Name, string Prefix, XPathNodeType Type) : base(qyParent, Name, Prefix, Type) {}
private NamespaceQuery(NamespaceQuery other) : base(other) {
this.onNamespace = other.onNamespace;
}
public override void Reset() {
onNamespace = false;
base.Reset();
}
public override XPathNavigator Advance() {
while (true) {
if (!onNamespace) {
currentNode = qyInput.Advance();
if (currentNode == null) {
return null;
}
position = 0;
currentNode = currentNode.Clone();
onNamespace = currentNode.MoveToFirstNamespace();
} else {
onNamespace = currentNode.MoveToNextNamespace();
}
if (onNamespace) {
if (matches(currentNode)) {
position++;
return currentNode;
}
}
} // while
} // Advance
public override bool matches(XPathNavigator e) {
Debug.Assert(e.NodeType == XPathNodeType.Namespace);
if (e.Value.Length == 0) {
Debug.Assert(e.LocalName.Length == 0, "Only xmlns='' can have empty string as a value");
// Namespace axes never returns xmlns='',
// because it's not a NS declaration but rather undeclaration.
return false;
}
if (NameTest) {
return Name.Equals(e.LocalName);
} else {
return true;
}
}
public override XPathNodeIterator Clone() { return new NamespaceQuery(this); }
}
}
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