61 lines
2.3 KiB
C#
61 lines
2.3 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="DescendantQuery.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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internal class DescendantQuery : DescendantBaseQuery {
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XPathNodeIterator nodeIterator;
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internal DescendantQuery(Query qyParent, string Name, string Prefix, XPathNodeType Type, bool matchSelf, bool abbrAxis)
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: base(qyParent, Name, Prefix, Type, matchSelf, abbrAxis) {}
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public DescendantQuery(DescendantQuery other) : base(other) {
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this.nodeIterator = Clone(other.nodeIterator);
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}
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public override void Reset() {
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nodeIterator = null;
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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 (nodeIterator == null) {
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position = 0;
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XPathNavigator nav = qyInput.Advance();
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if (nav == null) {
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return null;
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}
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if (NameTest) {
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if (TypeTest == XPathNodeType.ProcessingInstruction) {
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nodeIterator = new IteratorFilter(nav.SelectDescendants(TypeTest, matchSelf), Name);
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} else {
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nodeIterator = nav.SelectDescendants(Name, Namespace, matchSelf);
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}
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} else {
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nodeIterator = nav.SelectDescendants(TypeTest, matchSelf);
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}
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}
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if (nodeIterator.MoveNext()) {
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position++;
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currentNode = nodeIterator.Current;
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return currentNode;
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} else {
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nodeIterator = null;
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}
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}
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}
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public override XPathNodeIterator Clone() { return new DescendantQuery(this); }
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}
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}
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