X-Git-Url: http://wien.tomnetworks.com/gitweb/?a=blobdiff_plain;f=mcs%2Fclass%2FSystem.XML%2FSystem.Xml%2FXmlLinkedNode.cs;h=cc6be542fd446b6cd69324dfa922a9fbb33b7789;hb=4477135bd8e477678d3ddaa4b508ff780b9e0a47;hp=1fd4d12fdb0621d69e7caadaab4c4397dba15c9d;hpb=c6fbc77fe6e1ccc017a3a6635007bc997f45e6e7;p=mono.git

diff --git a/mcs/class/System.XML/System.Xml/XmlLinkedNode.cs b/mcs/class/System.XML/System.Xml/XmlLinkedNode.cs
index 1fd4d12fdb0..cc6be542fd4 100644
--- a/mcs/class/System.XML/System.Xml/XmlLinkedNode.cs
+++ b/mcs/class/System.XML/System.Xml/XmlLinkedNode.cs
@@ -1,3 +1,13 @@
+//
+// System.Xml.XmlLinkedNode
+//
+// Authors:
+//   Jason Diamond <jason@injektilo.org>
+//   Kral Ferch <kral_ferch@hotmail.com>
+//
+// (C) 2002 Jason Diamond, Kral Ferch
+//
+
 using System;
 
 namespace System.Xml
@@ -5,20 +15,26 @@ namespace System.Xml
 	public abstract class XmlLinkedNode : XmlNode
 	{
 		#region Fields
+
 		XmlLinkedNode nextSibling;
+		XmlLinkedNode lastLinkedChild;
 
 		#endregion
 
 		#region Constructors
-		protected internal XmlLinkedNode(XmlDocument doc) : base(doc) { }
+		internal XmlLinkedNode(XmlDocument doc) : base(doc) { }
 
 		#endregion
 
-		#region Properties		
+		#region Properties
+
 		public override XmlNode NextSibling
 		{
 			get {
-				if (Object.ReferenceEquals(nextSibling, ParentNode.LastLinkedChild.NextLinkedSibling) == false) {
+				if(ParentNode == null) {
+					return null;
+				}
+				else if (Object.ReferenceEquals(nextSibling, ParentNode.LastLinkedChild.NextLinkedSibling) == false) {
 					return nextSibling;
 				}
 				else {
@@ -33,14 +49,29 @@ namespace System.Xml
 			set { nextSibling = value; }
 		}
 
-		[MonoTODO]
 		public override XmlNode PreviousSibling
 		{
 			get {
-				throw new NotImplementedException ();
+				if (ParentNode != null) {
+					XmlNode node = ParentNode.FirstChild;
+					if (node != this) {
+						do {
+							if (node.NextSibling == this)
+								return node;
+						} while ((node = node.NextSibling) != null);
+					}					
+				}
+				return null;
 			}
 		}
 
+		// copied this way from XmlElement
+		internal override XmlLinkedNode LastLinkedChild
+		{
+			get { return lastLinkedChild; }
+			set { lastLinkedChild = value; }
+		}
+
 		#endregion
 	}
 }