XOM API for Processing XML with Java

[Elliotte Rusty Harold <elharo AT metalab.unc.edu>]

At 11:38 PM -0500 3/9/04, John Cowan wrote:


> I'd like there to be a way for any attempt to add a ParagraphElement
> to an HTMLElement to introduce a BodyElement between them, but
> the check methods can't accomplish that.


Would adding checkAttach solve that problem? Suppose we have this:

HTMLElement html = new HTMLElement();
PElement p = new PElement();
html.appendChild(p);

We could fix this in checkInsertChild like so:

protected void checkInsertChild(Element child) {

  if (child instanceof PElement) {
     BodyElement body = new BodyElement();
     appendChild(body);
     body.appendChild (child)
  }
  throw new XMLException();

}

Gaak. That's ugly. I don't like the side effects or throwing the 
exception here, but I think that should work.

Can we do the same in checkAttach()? Let's see:

protected void checkAttach(ParentNode parent) {

  if (parent instanceof HTMLElement) {
     BodyElement body = new BodyElement();
     parent.appendChild(body);
     body.appendChild(this);
  }
  throw new XMLException();

}

Still ugly, but not significantly different than the checkInsertChild 
solution.
--

  Elliotte Rusty Harold
  elharo AT metalab.unc.edu
  Effective XML (Addison-Wesley, 2003)
  http://www.cafeconleche.org/books/effectivexml
  http://www.amazon.com/exec/obidos/ISBN%3D0321150406/ref%3Dnosim/cafeaulaitA