XmlLinkedNode.cs :  » 2.6.4-mono-.net-core » System.Xml » System » Xml » C# / CSharp Open Source

//
// System.Xml.XmlLinkedNode
//
// Authors:
//   Jason Diamond <jason@injektilo.org>
//   Kral Ferch <kral_ferch@hotmail.com>
//
// (C) 2002 Jason Diamond, Kral Ferch
//

//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;

namespace System.Xml{
  public abstract class XmlLinkedNode : XmlNode
  {
    #region Fields

    XmlLinkedNode nextSibling;

    #endregion

    #region Constructors
    internal XmlLinkedNode(XmlDocument doc) : base(doc) { }

    #endregion

    #region Properties
    internal bool IsRooted {
      get {
        for (XmlNode n = ParentNode; n != null; n = n.ParentNode)
          if (n.NodeType == XmlNodeType.Document)
            return true;
        return false;
      }
    }

    public override XmlNode NextSibling
    {
      get { return ParentNode == null || ParentNode.LastChild == this ? null : nextSibling; }
    }

    internal XmlLinkedNode NextLinkedSibling
    {
      get { return nextSibling; }
      set { nextSibling = value; }
    }

    public override XmlNode PreviousSibling
    {
      get {
        if (ParentNode != null) {
          XmlNode node = ParentNode.FirstChild;
          if (node != this) {
            do {
              if (node.NextSibling == this)
                return node;
            } while ((node = node.NextSibling) != null);
          }          
        }
        return null;
      }
    }

    #endregion
  }
}