77 lines
2.9 KiB
C#
77 lines
2.9 KiB
C#
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//------------------------------------------------------------------------------
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// <copyright file="CacheOutputQuery.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">[....]</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.Xml.Xsl;
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using System.Collections.Generic;
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internal abstract class CacheOutputQuery : Query {
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internal Query input;
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// int count; -- we reusing it here
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protected List<XPathNavigator> outputBuffer;
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public CacheOutputQuery(Query input) {
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this.input = input;
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this.outputBuffer = new List<XPathNavigator>();
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this.count = 0;
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}
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protected CacheOutputQuery(CacheOutputQuery other) : base(other) {
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this.input = Clone(other.input);
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this.outputBuffer = new List<XPathNavigator>(other.outputBuffer);
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this.count = other.count;
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}
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public override void Reset() {
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this.count = 0;
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}
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public override void SetXsltContext(XsltContext context){
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input.SetXsltContext(context);
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}
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public override object Evaluate(XPathNodeIterator context) {
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outputBuffer.Clear();
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count = 0;
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return input.Evaluate(context);// This is trick. IDQuery needs this value. Otherwise we would return this.
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// All subclasses should and would anyway override thismethod and return this.
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}
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public override XPathNavigator Advance() {
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Debug.Assert(0 <= count && count <= outputBuffer.Count);
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if (count < outputBuffer.Count) {
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return outputBuffer[count++];
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}
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return null;
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}
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public override XPathNavigator Current {
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get {
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Debug.Assert(0 <= count && count <= outputBuffer.Count);
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if (count == 0) {
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return null;
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}
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return outputBuffer[count - 1];
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}
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}
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public override XPathResultType StaticType { get { return XPathResultType.NodeSet; } }
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public override int CurrentPosition { get { return count; } }
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public override int Count { get { return outputBuffer.Count; } }
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public override QueryProps Properties { get { return QueryProps.Merge | QueryProps.Cached | QueryProps.Position | QueryProps.Count; } }
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public override void PrintQuery(XmlWriter w) {
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w.WriteStartElement(this.GetType().Name);
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input.PrintQuery(w);
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w.WriteEndElement();
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}
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}
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}
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