ContextQuery.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / Xml / System / Xml / XPath / Internal / ContextQuery.cs / 1 / ContextQuery.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;

    internal class ContextQuery : Query { 
        protected XPathNavigator contextNode;
 
        public ContextQuery() { 
            this.count = 0;
        } 
        protected ContextQuery(ContextQuery other) : base(other) {
            this.contextNode = other.contextNode;   // Don't need to clone here
        }
        public override void Reset() { 
            count = 0;
        } 
 
        public override XPathNavigator Current { get { return contextNode; } }
 
        public override object Evaluate(XPathNodeIterator context) {
            contextNode = context.Current; // We don't clone here. Because we never move it.
            count = 0;
            return this; 
        }
 
        public override XPathNavigator Advance() { 
            if (count == 0) {
                count = 1; 
                return contextNode;
            }
            return null;
        } 

        public override XPathNavigator MatchNode(XPathNavigator current) { 
            return current; 
        }
 
        public override XPathNodeIterator Clone() { return new ContextQuery(this); }

        public override XPathResultType StaticType { get { return XPathResultType.NodeSet; } }
        public override int CurrentPosition   { get { return count; } } 
        public override int Count             { get { return 1; } }
        public override QueryProps Properties { get { return QueryProps.Merge | QueryProps.Cached | QueryProps.Position | QueryProps.Count; } } 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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