MergeFilterQuery.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FXUpdate3074 / FXUpdate3074 / 1.1 / untmp / whidbey / QFE / ndp / fx / src / Xml / System / Xml / XPath / Internal / MergeFilterQuery.cs / 2 / MergeFilterQuery.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 sealed class MergeFilterQuery : CacheOutputQuery { 
        private Query child; 

        public MergeFilterQuery(Query input, Query child) : base(input) { 
            this.child  = child;
        }
        private MergeFilterQuery(MergeFilterQuery other) : base(other) {
            this.child  = Clone(other.child); 
        }
 
        public override void SetXsltContext(XsltContext xsltContext) { 
            base.SetXsltContext(xsltContext);
            child.SetXsltContext(xsltContext); 
        }

        public override object Evaluate(XPathNodeIterator nodeIterator) {
            base.Evaluate(nodeIterator); 

            while (input.Advance() != null) { 
                child.Evaluate(input); 
                XPathNavigator node;
                while ((node = child.Advance()) != null) { 
                    Insert(outputBuffer, node);
                }
            }
            return this; 
        }
 
        public override XPathNavigator MatchNode(XPathNavigator current) { 
            XPathNavigator context = child.MatchNode(current);
            if (context == null) { 
                return null;
            }
            context = input.MatchNode(context);
            if (context == null) { 
                return null;
            } 
            Evaluate(new XPathSingletonIterator(context.Clone(), /*moved:*/true)); 
            XPathNavigator result = Advance();
            while (result != null) { 
                if (result.IsSamePosition(current)) {
                    return context;
                }
                result = Advance(); 
            }
            return null; 
        } 

        public override XPathNodeIterator Clone() { return new MergeFilterQuery(this); } 

        public override void PrintQuery(XmlWriter w) {
            w.WriteStartElement(this.GetType().Name);
            input.PrintQuery(w); 
            child.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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