69 lines
2.5 KiB
C#
69 lines
2.5 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="NamespaceQuery.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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// <owner current="true" primary="true">Microsoft</owner>
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//------------------------------------------------------------------------------
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namespace MS.Internal.Xml.XPath {
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using System;
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using System.Xml;
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using System.Xml.XPath;
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using System.Diagnostics;
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using System.Globalization;
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internal sealed class NamespaceQuery : BaseAxisQuery {
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private bool onNamespace;
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public NamespaceQuery(Query qyParent, string Name, string Prefix, XPathNodeType Type) : base(qyParent, Name, Prefix, Type) {}
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private NamespaceQuery(NamespaceQuery other) : base(other) {
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this.onNamespace = other.onNamespace;
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}
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public override void Reset() {
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onNamespace = false;
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base.Reset();
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}
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public override XPathNavigator Advance() {
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while (true) {
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if (!onNamespace) {
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currentNode = qyInput.Advance();
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if (currentNode == null) {
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return null;
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}
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position = 0;
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currentNode = currentNode.Clone();
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onNamespace = currentNode.MoveToFirstNamespace();
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} else {
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onNamespace = currentNode.MoveToNextNamespace();
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}
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if (onNamespace) {
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if (matches(currentNode)) {
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position++;
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return currentNode;
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}
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}
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} // while
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} // Advance
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public override bool matches(XPathNavigator e) {
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Debug.Assert(e.NodeType == XPathNodeType.Namespace);
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if (e.Value.Length == 0) {
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Debug.Assert(e.LocalName.Length == 0, "Only xmlns='' can have empty string as a value");
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// Namespace axes never returns xmlns='',
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// because it's not a NS declaration but rather undeclaration.
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return false;
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}
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if (NameTest) {
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return Name.Equals(e.LocalName);
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} else {
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return true;
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}
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}
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public override XPathNodeIterator Clone() { return new NamespaceQuery(this); }
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}
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}
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