RE: [HAPI-devel] message segment counts

[Tripp, B. <Bry...@uh...>]

> I'm seriously considering a name-indexed method that will do 
> a tree traversal on an entire parsed message from the root. 
> It would be pretty inefficient, but as long as a user of my 
> app isn't watching an hour glass while i tool around in a 
> message's basement, it would save lazy me some coding time.
> 
> Has someone already done this ?

Check out ca.uhn.hl7v2.util.MessageIterator.  It iterates through a message
without regard to whether each structure exists yet (it creates groups and
segments on the fly as needed).  It's meant to help with parsing.  It needs
a name index to decide where to iterate next, because of infinitely
repeatable segments, etc. (it always tries to go in the "direction" of the
name).  

This may not be exactly what you want, but if you want to iterate only
through structures that exist, or that have content, maybe you could write a
FilterIterator for that purpose? 

Bryan 


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