Daniel Fagerstrom wrote:
was: Re: Cocoon F2F at ApacheCon
...
BTW, I started to sketch a proof of concept pull-based pipeline API
and will commit it to whiteboard/cong once I've managed to set up a
basic file/xslt/html pipeline with some content inspection in the
middle.
Cool.
What about letting it implement ProcessingPipeline so that we can use
it together with current Cocoon?
That's an idea, but the pipeline API needs to provide more than
process(environment) and a StAX pipeline can actually be used as a
regular XMLStreamReader (the StAX parser API), which provides some
interesting properties for programmatically chaining pipelines.
Now for sure we can write an adapter implementing the ProcessingPipeline
interface.
Are there XSLT implementations that support StAX?
Not that I know of. Now there are some SAX<->StAX conversion utilities
in the stax-utils project that will help.
You should take a look at Axiom,
http://ws.apache.org/axis2/OMTutorial.html, from Axis2. It is a light
weight, supposedly high performance, XML object model that is based on
StAX, and has built in caching, that can be turned of. It is designed
so that you can cache elements in the StAX input stream in such a way
that you can do ordinary JDOM like tree random access, but when
turning caching of you neither build nor construct any elements.
Yeah, I looked at it. AFAIU, it defers pulling the events until they are
really needed by the tree traversal operations.
There is also a Jaxen adaper for Axiom.
Cool! I was looking for that, as we need it for a content-aware XPath
matcher that wouldn't buffer the whole input document.
The refactored JXTG is, at least on a conceptual level, designed to be
pull parsers friendly. It should be possible to replace the internal
object model with Axiom. This would make it usable both in current
pipelines and in the pull based ones.
WDYT?
Sounds great. I look forward for some collective hacking during
ApacheCon and don't know if we'll spend much time in session rooms :-)
Sylvain
--
Sylvain Wallez Anyware Technologies
http://bluxte.net http://www.anyware-tech.com
Apache Software Foundation Member Research & Technology Director
