Re: AW: cvs commit: xml-cocoon2/src/org/apache/cocoon/transformation I18nTransformer.java TraxTransformer.java

[Sylvain Wallez <sy...@anyware-tech.com>]

Carsten Ziegeler a écrit :
> 
> Hi Team,
> 
> first the good news: We have a working cocoon: protocol. Just add
> 
> <map:match pattern="test">
>         <map:generate src="cocoon://hello.html"/>
>         <map:serialize type="xml"/>
> </map:match>
> 
> to your sitemap and you will get the response of the hello.html
> pipeline as xml.
> 
> The ContentAggregator now uses these cocoon: urls, too.
> 
Great job, Carsten !

> Let's start the problems now:
> - We need to define the exact meaning of the cocoon: url, is it
> relative to the current sitemap or does it always start at the
> root sitemap?
> 
Since "cocoon:" isn't a real URL protocol (host and port have no meaning
here), it could depend on the number of "/" characters, i.e. :
- "cocoon:hello.html" : relative to the current URI
- "cocoon:/hello.html" : relative to the current sitemap
- "cocoon://hello.html" : absolute from the root sitemap

> - The ContentAggregator was designed to aggregate pipelines. We
>   could now use it to aggregate any xml sources! But this would
>   require to explicitly use the cocoon: protocol in the <map:part>
>   of the aggregation (breaking compatibility).
>   I vote +1 for this change.
> 
+1 also. This increases consistency since all "src" attributes will have
the same behaviour (filesystem access when no protocol is specified).

> - And now the really bad news:
>   The cocoon: protocol does not use the URLFactory nor does it
>   use any URL object. Why? Well, last year was the discussion
>   about adding own protocol handlers in a servlet environment
>   in this mailing list. The conclusion was, that the usual
>   java approach is not possible.
>   So I thought of making a fake URL object. But this is neither
>   possible as the URL class is final.
>   The current solution: The URL objects and the cocoon: protocol
>   are wrapped by the Source object (introduced month ago with
>   the SourceResolver). There is the URLSource object which wrapps
>   URLs and the SitemapSource object describing a pipeline.
> 
>   This approach together with the fact that adding real protocol
>   handlers in a servlet environment is not possible leads me
>   to the conclusion that the URLFactory is not of as much use
>   as it could be.
>   I would suggest to move it over to a SourceFactory which produces
>   Source objects from an url.
> 
> PS: Oh, I forgot to mention that of course the cocoon: protocol
>     is directly streamed into the pipeline, this means retrieving
>     the content of this url is not done by first converting
>     the sax events into a byte stream and then reparsing this
>     to create sax events.
>     The Source object is now capable of streaming its content.
>     I changed the FileGenerator to use this feature directly. We
>     should update the other components as well.
> 
> Carsten
> 
+1 for having SourceFactory being cocoon's preferred way to retrieve
content. This allows to have particular schemes like cocoon: while still
being able to use regular URLs.

-- 
Sylvain Wallez
Anyware Technologies - http://www.anyware-tech.com

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