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List:       xml-cocoon-dev
Subject:    RE: Shipping compiled translets rather than XSL files in plain text format
From:       "Geoff Howard" <cocoon () leverageweb ! com>
Date:       2003-03-30 21:39:13
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I'm sure changing the Translet interface is going to be more feasible.
I have no experience with xsltc internals but there are undoubtedly
others here who know enough to say whether this is reasonable or not.

Geoff

> -----Original Message-----
> From: jcplerm [mailto:jcplerm@ameritech.net]
> Sent: Sunday, March 30, 2003 3:55 PM
> To: cocoon-users@xml.apache.org
> Subject: Re: Shipping compiled translets rather than XSL files in plain
> text format
>
>
> Taking a look at XSLTC-related source files, it appears that
> there is a limitation on XSLTC's side in terms of requiring
> a DOM object as argument to the method "transform" of
> class org.apache.xalan.xsltc.Translet.
>
> This is the Translet interface definition:
>
> package org.apache.xalan.xsltc;
> public interface Translet {
>     public void transform(DOM document, TransletOutputHandler handler)
>  throws TransletException;
>     public void transform(DOM document, TransletOutputHandler[] handlers)
>  throws TransletException;
>     public void transform(DOM document, NodeIterator iterator,
>      TransletOutputHandler handler)
>  throws TransletException;
>     public Object addParameter(String name, Object value);
>     public void buildKeys(DOM document, NodeIterator iterator,
>      TransletOutputHandler handler, int root)
>  throws TransletException;
>     public void addAuxiliaryClass(Class auxClass);
>     public Class getAuxiliaryClass(String className);
>     public String[] getNamesArray();
>     public String[] getNamespaceArray();
> }
>
> The fact that a DOM object is required limits its
> applicability to the Cocoon framework, since one of the
> biggest strengths of Cocoon is the SAX-based processing.
> In order to take advantage of a Translet in a Cocoon pipeline,
> a sitemap component would then have to first build a DOM tree from
> the stream of SAX events and then invoke the translet.
> Looks feasible, but a Translet should be able to handle SAX
> events, in addition to a DOM document anyway.
>
> Then I guess there are two ways of moving ahead.
> Please correct me if I'm wrong:
>
> 1) Have XSLTC's Translet implementation changed,
> so it is able to deal with SAX-based processing;
>
> 2) Cocoon provides a way of compiling, or at least
> serializing the stylesheets. This compiled or serialized
> image of the pipeline transformations could then be
> deployed at customer sites. This would then mean
> Cocoon would be doing similar to XSLTC, but then
> comes the question to Cocoon's developers: what is the
> feasibility?
>
> Thanks,
>
> Julio
>
> ----- Original Message -----
> From: "Geoff Howard" <cocoon@leverageweb.com>
> To: <cocoon-users@xml.apache.org>
> Sent: Sunday, March 30, 2003 6:42 AM
> Subject: RE: Shipping compiled translets rather than XSL files in
> plain text
> format
>
>
> > A great question I'd be interested in.  I've not heard anyone
> doing this,
> so
> > if you
> > don't get an answer you'll need to dig into it yourself.  The
> first thing
> > I'd try is
> > to see how xsltc (I assume you're using that) handles precomiled
> > stylesheets.  What
> > does it expect as its source?  A classname?  It may be as simple as
> setting
> > up
> > cocoon to use xsltc (see archives and wiki) and passing the classname in
> the
> > src
> > attribute of the transformer.
> >
> > Please report back what you find and I (or others) can help
> evaluate what
> > internal
> > changes would be necessary to accomodate this if it doesn't just work
> > automagically.
> >
> > Are you using 2.1dev or 2.0.4?
> >
> > Geoff Howard
> >
> > -----Original Message-----
> > From: jcplerm [mailto:jcplerm@ameritech.net]
> > Sent: Saturday, March 29, 2003 11:02 PM
> > To: cocoon-users@xml.apache.org
> > Subject: Shipping compiled translets rather than XSL files in plain text
> > format
> >
> >
> > Is it possible to deploy Cocoon applications at customer sites just by
> > installing compiled versions of XSL stylesheets (translets) rather than
> > supplying them in plain text format?
> >
> > Thanks,
> >
> > Julio Lerm
> > Chicago, IL
> >
> >
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>
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