mcs/class/System.XML/System.Xml.XPath/XPathComparer.cs

   1 //
   2 // System.Xml.XPath.XPathComparer
   3 //
   4 // Author:
   5 //      Atsushi Enomoto <ginga@kit.hi-ho.ne.jp>
   6 //
   7 // (C) 2003 Atsushi Enomoto
   8 //
   9
  10 using System;
  11 using System.Collections;
  12 using System.Xml;
  13 using System.Xml.XPath;
  14 using System.Xml.Xsl;
  15
  16 namespace System.Xml.XPath
  17 {
  18         internal class XPathIteratorComparer : IComparer
  19         {
  20                 public static XPathIteratorComparer Instance = new XPathIteratorComparer ();
  21                 private XPathIteratorComparer ()
  22                 {
  23                 }
  24
  25                 public int Compare (object o1, object o2)
  26                 {
  27                         BaseIterator nav1 = o1 as BaseIterator;
  28                         BaseIterator nav2 = o2 as BaseIterator;
  29                         if (nav1 == null)
  30                                 return -1;
  31                         if (nav2 == null)
  32                                 return 1;
  33                         switch (nav1.Current.ComparePosition (nav2.Current)) {
  34                         case XmlNodeOrder.Same:
  35                                 return 0;
  36                         case XmlNodeOrder.After:
  37                                 return -1;
  38                         default:
  39                                 return 1;
  40                         }
  41                 }
  42         }
  43
  44         internal class XPathNavigatorComparer : IComparer
  45         {
  46                 public static XPathNavigatorComparer Instance = new XPathNavigatorComparer ();
  47                 private XPathNavigatorComparer ()
  48                 {
  49                 }
  50
  51                 public int Compare (object o1, object o2)
  52                 {
  53                         XPathNavigator nav1 = o1 as XPathNavigator;
  54                         XPathNavigator nav2 = o2 as XPathNavigator;
  55                         if (nav1 == null)
  56                                 return -1;
  57                         if (nav2 == null)
  58                                 return 1;
  59                         switch (nav1.ComparePosition (nav2)) {
  60                         case XmlNodeOrder.Same:
  61                                 return 0;
  62                         case XmlNodeOrder.After:
  63                                 return 1;
  64                         default:
  65                                 return -1;
  66                         }
  67                 }
  68         }
  69 }