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 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System;
  32 using System.Collections;
  33 using System.Xml;
  34 using System.Xml.XPath;
  35 using System.Xml.Xsl;
  36
  37 namespace System.Xml.XPath
  38 {
  39         internal class XPathIteratorComparer : IComparer
  40         {
  41                 public static XPathIteratorComparer Instance = new XPathIteratorComparer ();
  42                 private XPathIteratorComparer ()
  43                 {
  44                 }
  45
  46                 public int Compare (object o1, object o2)
  47                 {
  48                         BaseIterator nav1 = o1 as BaseIterator;
  49                         BaseIterator nav2 = o2 as BaseIterator;
  50                         if (nav1 == null)
  51                                 return -1;
  52                         if (nav2 == null)
  53                                 return 1;
  54                         switch (nav1.Current.ComparePosition (nav2.Current)) {
  55                         case XmlNodeOrder.Same:
  56                                 return 0;
  57                         case XmlNodeOrder.After:
  58                                 return -1;
  59                         default:
  60                                 return 1;
  61                         }
  62                 }
  63         }
  64
  65         internal class XPathNavigatorComparer : IComparer
  66         {
  67                 public static XPathNavigatorComparer Instance = new XPathNavigatorComparer ();
  68                 private XPathNavigatorComparer ()
  69                 {
  70                 }
  71
  72                 public int Compare (object o1, object o2)
  73                 {
  74                         XPathNavigator nav1 = o1 as XPathNavigator;
  75                         XPathNavigator nav2 = o2 as XPathNavigator;
  76                         if (nav1 == null)
  77                                 return -1;
  78                         if (nav2 == null)
  79                                 return 1;
  80                         switch (nav1.ComparePosition (nav2)) {
  81                         case XmlNodeOrder.Same:
  82                                 return 0;
  83                         case XmlNodeOrder.After:
  84                                 return 1;
  85                         default:
  86                                 return -1;
  87                         }
  88                 }
  89         }
  90 }