mcs/class/referencesource/System.Xml/System/Xml/XPath/Internal/ForwardPositionQuery.cs

   1 //------------------------------------------------------------------------------
   2 // <copyright file="ForwardPositionQuery.cs" company="Microsoft">
   3 //     Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 // <owner current="true" primary="true">Microsoft</owner>
   6 //------------------------------------------------------------------------------
   7
   8 namespace MS.Internal.Xml.XPath {
   9     using System;
  10     using System.Xml;
  11     using System.Xml.XPath;
  12     using System.Diagnostics;
  13
  14     internal class ForwardPositionQuery : CacheOutputQuery {
  15
  16         public ForwardPositionQuery(Query input) : base(input) {
  17             Debug.Assert(input != null);
  18         }
  19         protected ForwardPositionQuery(ForwardPositionQuery other) : base(other) { }
  20
  21         public override object Evaluate(XPathNodeIterator context) {
  22             base.Evaluate(context);
  23
  24             XPathNavigator node;
  25             while ((node = base.input.Advance()) != null) {
  26                 outputBuffer.Add(node.Clone());
  27             }
  28
  29             return this;
  30         }
  31
  32         public override XPathNavigator MatchNode(XPathNavigator context) {
  33             return input.MatchNode(context);
  34         }
  35
  36         public override XPathNodeIterator Clone() { return new ForwardPositionQuery(this); }
  37     }
  38 }
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