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

   1 //------------------------------------------------------------------------------
   2 // <copyright file="IDQuery.cs" company="Microsoft">
   3 //     Copyright (c) Microsoft Corporation.  All rights reserved.
   4 // </copyright>
   5 // <owner current="true" primary="true">[....]</owner>
   6 //------------------------------------------------------------------------------
   7
   8 namespace MS.Internal.Xml.XPath {
   9     using System;
  10     using System.Xml;
  11     using System.Xml.XPath;
  12     using System.Xml.Xsl;
  13     using System.Diagnostics;
  14     using System.Collections.Generic;
  15
  16     internal sealed class IDQuery : CacheOutputQuery {
  17
  18         public IDQuery(Query arg) : base(arg) {}
  19         private IDQuery(IDQuery other) : base(other) { }
  20
  21         public override object Evaluate(XPathNodeIterator context) {
  22             object argVal = base.Evaluate(context);
  23             XPathNavigator contextNode = context.Current.Clone();
  24
  25             switch (GetXPathType(argVal)) {
  26             case XPathResultType.NodeSet:
  27                 XPathNavigator temp;
  28                 while ((temp = input.Advance()) != null) {
  29                     ProcessIds(contextNode, temp.Value);
  30                 }
  31                 break;
  32             case XPathResultType.String:
  33                 ProcessIds(contextNode, (string)argVal);
  34                 break;
  35             case XPathResultType.Number:
  36                 ProcessIds(contextNode, StringFunctions.toString((double)argVal));
  37                 break;
  38             case XPathResultType.Boolean:
  39                 ProcessIds(contextNode, StringFunctions.toString((bool)argVal));
  40                 break;
  41             case XPathResultType_Navigator:
  42                 ProcessIds(contextNode, ((XPathNavigator)argVal).Value);
  43                 break;
  44             }
  45             return this;
  46         }
  47
  48         void ProcessIds(XPathNavigator contextNode, string val) {
  49             string[] ids = XmlConvert.SplitString(val);
  50             for (int idx = 0; idx < ids.Length; idx++) {
  51                 if (contextNode.MoveToId(ids[idx])) {
  52                     Insert(outputBuffer, contextNode);
  53                 }
  54             }
  55         }
  56
  57         public override XPathNavigator MatchNode(XPathNavigator context) {
  58             Evaluate(new XPathSingletonIterator(context, /*moved:*/true));
  59             XPathNavigator result;
  60             while ((result = Advance()) != null) {
  61                 if (result.IsSamePosition(context)) {
  62                     return context;
  63                 }
  64             }
  65             return null;
  66         }
  67
  68         public override XPathNodeIterator Clone() { return new IDQuery(this); }
  69     }
  70 }