public virtual INode InsertBefore(INode newChild, INode refChild)
{
// TODO - handle newChild already in tree
if (newChild == null)
{
return(null);
}
if (!(newChild is DomNodeImpl))
{
throw new DomException(DomException.WrongDocument, "newChild not instanceof DomNodeImpl");
}
DomNodeImpl newCh = (DomNodeImpl)newChild;
if (this.Adaptee.Type == Node.RootNode)
{
if (newCh.Adaptee.Type != Node.DocTypeTag && newCh.Adaptee.Type != Node.ProcInsTag)
{
throw new DomException(DomException.HierarchyRequest, "newChild cannot be a child of this node");
}
}
else if (this.Adaptee.Type == Node.StartTag)
{
if (newCh.Adaptee.Type != Node.StartTag && newCh.Adaptee.Type != Node.StartEndTag && newCh.Adaptee.Type != Node.CommentTag && newCh.Adaptee.Type != Node.TextNode && newCh.Adaptee.Type != Node.CDATATag)
{
throw new DomException(DomException.HierarchyRequest, "newChild cannot be a child of this node");
}
}
if (refChild == null)
{
Node.InsertNodeAtEnd(this.Adaptee, newCh.Adaptee);
if (this.Adaptee.Type == Node.StartEndTag)
{
this.Adaptee.Type = Node.StartTag;
}
}
else
{
Node refNode = this.Adaptee.Content;
while (refNode != null)
{
if (refNode.Adapter == refChild)
{
break;
}
refNode = refNode.Next;
}
if (refNode == null)
{
throw new DomException(DomException.NotFound, "refChild not found");
}
Node.InsertNodeBeforeElement(refNode, newCh.Adaptee);
}
return(newChild);
}