* Timothy Larson <[EMAIL PROTECTED]> [2003-10-14 19:00]:
> (Note to Javier: I am fowarding my reply to the list, since I saw your
> public reply just moments after I had already sent this reply privately)
>
> --- Javier del Gesu <[EMAIL PROTECTED]> wrote:
> > This is reassuring. I wrote something similiar to create a SAX
> > filter, where processing of diferent nodes is handled by different
> > objects.
> This is where the poor man's continuations come in handy. I have some
> techniques that allow loops and other code structures to be continued.
> These features do not get used in the WoodyTemplateTransformer, but I
> plan to use them in processing other structured data in other projects.
>
> I like your put/get interface for communicating data between handlers.
> That concept may get used when the Effect transformer gets exteded to
> handle multiple inputs and outputs and a few other things...
Futher consideration (these are examples, not actual code):
class ExampleFilter extends AbstractContentFilter {
private String command;
private CollectionFilter collectionFilter;
public ExampleFilter () {
collectionFilter = new CollectionFilter();
}
public void start (FilterContext filterContext,
SAXStartElementEvent event) throws SAXException {
}
public void startElement (FilterContext filterContext,
SAXStartElementEvent event) throws SAXException {
String localName = filterContext.getLocalName();
if (localName.equals("document")) {
// Reuse a common component.
// Build a DOM document and put it user the key "doc"
// in the filter context.
filterContext.startContentFilter(new DOMFilter("doc"));
} else if (localName.equals("command")) {
// Create an anonymous inner class to intercept a value.
ContentFilter anonymous = new AbstractContentFilter () {
public void characters (FilterContext filterContext,
SAXCharacterEvent event) throws SAXException {
ExampleFilter.this.command =
event.getCharactersAsString();
}
}
filterContext.startContentFilter(anonymous);
} else if (localName.equals("item")) {
// Use the same filter for a certian set of element
// names, preserves state.
// Is this what you mean by continuations?
filterContext.startContentFilter(collectionFilter);
}
}
public void end (FilterContext filterContext, SAXEventEvent event)
throws SAXException {
if (command != null)
Singleton.doSomethingWithCommand(command);
Document document = (Document) filterContext.get("doc");
if (document != null)
Singleton.doSomethingWithDoucment(document);
Object items[] = collectionFilter.toArray();
Singleton.doSomethingWithItems(items);
}
}
Did I cover all the bases?
--
Javier del Gesu - [EMAIL PROTECTED]
