CacheOutputQuery.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / 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 List outputBuffer; 

        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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