Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / XPath / Internal / CacheOutputQuery.cs / 1 / CacheOutputQuery.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- namespace MS.Internal.Xml.XPath { using System; using System.Xml; using System.Xml.XPath; using System.Diagnostics; using System.Xml.Xsl; using System.Collections.Generic; internal abstract class CacheOutputQuery : Query { internal Query input; // int count; -- we reusing it here protected ListoutputBuffer; public CacheOutputQuery(Query input) { this.input = input; this.outputBuffer = new List (); this.count = 0; } protected CacheOutputQuery(CacheOutputQuery other) : base(other) { this.input = Clone(other.input); this.outputBuffer = new List (other.outputBuffer); this.count = other.count; } public override void Reset() { this.count = 0; } public override void SetXsltContext(XsltContext context){ input.SetXsltContext(context); } public override object Evaluate(XPathNodeIterator context) { outputBuffer.Clear(); count = 0; return input.Evaluate(context);// This is trick. IDQuery needs this value. Otherwise we would return this. // All subclasses should and would anyway override thismethod and return this. } public override XPathNavigator Advance() { Debug.Assert(0 <= count && count <= outputBuffer.Count); if (count < outputBuffer.Count) { return outputBuffer[count++]; } return null; } public override XPathNavigator Current { get { Debug.Assert(0 <= count && count <= outputBuffer.Count); if (count == 0) { return null; } return outputBuffer[count - 1]; } } public override XPathResultType StaticType { get { return XPathResultType.NodeSet; } } public override int CurrentPosition { get { return count; } } public override int Count { get { return outputBuffer.Count; } } public override QueryProps Properties { get { return QueryProps.Merge | QueryProps.Cached | QueryProps.Position | QueryProps.Count; } } public override void PrintQuery(XmlWriter w) { w.WriteStartElement(this.GetType().Name); input.PrintQuery(w); w.WriteEndElement(); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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