Getting SAXParser to stop what it's doing

Question

I have a simple question: I'm creating a thread that uses a SAXParser to parse through a very large file. The full parse takes about ten hours. I'm doing this from within a Swing application. When the user hits the "cancel" button, I would like to be able to stop SAXParser from doing its parsing. I can't find anything in the API that looks like it would let me send a message to the parser telling it to quit.
There must be a way to do this. SAXParser is what you use when you're parsing a file which is too big to fit in memory, so it will often be used in processing very large files.
Any suggestions?
Thanks

Answer 1

i'd try
class MyContentHandler extends DefaultHandler
        Object lock;
        boolean stop = false;
        public void stopMe()
               synchronized(lock)
                     stop = true;
        public void startElement(String ns, String ln, String qn, Attributes a)
                synchronized(lock)
                         if (stop)
                                  throw new SAXParserException("User Interrupted");
                ..... //whatever you did before
      // other contenthandler methods as before
}