mcs/class/System.XML/System.Xml/XmlLinkedNode.cs

   1 //
   2 // System.Xml.XmlLinkedNode
   3 //
   4 // Authors:
   5 //   Jason Diamond <jason@injektilo.org>
   6 //   Kral Ferch <kral_ferch@hotmail.com>
   7 //
   8 // (C) 2002 Jason Diamond, Kral Ferch
   9 //
  10
  11 using System;
  12
  13 namespace System.Xml
  14 {
  15         public abstract class XmlLinkedNode : XmlNode
  16         {
  17                 #region Fields
  18
  19                 XmlLinkedNode nextSibling;
  20                 XmlLinkedNode lastLinkedChild;
  21
  22                 #endregion
  23
  24                 #region Constructors
  25                 internal XmlLinkedNode(XmlDocument doc) : base(doc) { }
  26
  27                 #endregion
  28
  29                 #region Properties
  30
  31                 public override XmlNode NextSibling
  32                 {
  33                         get {
  34                                 if(ParentNode == null) {
  35                                         return null;
  36                                 }
  37                                 else if (Object.ReferenceEquals(nextSibling, ParentNode.LastLinkedChild.NextLinkedSibling) == false) {
  38                                         return nextSibling;
  39                                 }
  40                                 else {
  41                                         return null;
  42                                 }
  43                         }
  44                 }
  45
  46                 internal XmlLinkedNode NextLinkedSibling
  47                 {
  48                         get { return nextSibling; }
  49                         set { nextSibling = value; }
  50                 }
  51
  52                 public override XmlNode PreviousSibling
  53                 {
  54                         get {
  55                                 if (ParentNode != null) {
  56                                         XmlNode node = ParentNode.FirstChild;
  57                                         if (node != this) {
  58                                                 do {
  59                                                         if (node.NextSibling == this)
  60                                                                 return node;
  61                                                 } while ((node = node.NextSibling) != null);
  62                                         }
  63                                 }
  64                                 return null;
  65                         }
  66                 }
  67
  68                 // copied this way from XmlElement
  69                 internal override XmlLinkedNode LastLinkedChild
  70                 {
  71                         get { return lastLinkedChild; }
  72                         set { lastLinkedChild = value; }
  73                 }
  74
  75                 #endregion
  76         }
  77 }