Re: [Htmlparser-developer] NodeIterator and SimpleNodeIterator

[Somik R. <so...@ya...>]

Hi Joseph,
  The difference is subtle. NodeIterator throws
exceptions. SimpleNodeIterator does not. This was bcos
a SimpleNodeIterator used inside a collection would
not need to throw parser exception, as it is not
parsing - just iterating. However, a NodeIterator
requires its implementations to throw exceptions
depending on the parse.
  One solution to your problem could be - have
NodeList return a NodeIterator as well. What do you
think ?

Regards,
Somik
--- Joseph Robins <jmr...@tg...> wrote:
> After finding myself poking through more and more of
> the code for the 
> HTML parser, and needing to fix bugs, I've decided
> to join this list. 
> And I figure that there's no better way to join the
> list than with a 
> question.  :-)  (I've looked through the archives,
> and I don't see the 
> answer in there.  Sorry if this was discussed before
> and I missed it.)
> 
> Is there a reason that the iterators that
> Parser.elements() and 
> CompositeTag.children() are different classes, and
> are incompatible?  I 
> wanted to write some code along the lines of:
> 
>
--------------------------------------------------------------
> 
> Parser parser = new Parser(url);
> NodeIterator iter = parser.elements();
> doParse(iter);
> 
> ...
> 
> private void doParse(NodeIterator iter) {
>    while(iter.hasMoreNodes()) {
>      Node node = iter.nextNode();
>      doStuff();
>      if(node instanceof CompositeTag) {
>        doParse(((CompositeTag)node).children());
>      }
>    }
> }
> 
>
--------------------------------------------------------------
> 
> Unfortunately, because the iterators are different
> (and don't even share 
> a superclass), I can't do this, and have to
> duplicate my doParse method 
> with two different signatures.
> 
> This seems like a natural thing to want to do.  For
> example, when 
> parsing a page, a form tag might contain a lot of
> other elements (text, 
> links, etc.) in it that we want to get, and the only
> way to do that is 
> to iterate inside.
> 
>
_____________________________________________________________
> Joe Robins				Tel:   212-918-5057
> Thaumaturgix, Inc.			Fax:   212-918-5001
> 19 W. 44th St., 18th Floor		Email: jmr...@tg...
> New York, NY 10036			http://www.tgix.com
> 
> thau'ma-tur-gy, n. the working of miracles.
> 
> 
> 
>
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