[xep-support] URL resolution

[Werner Donné]

John,

You can perhaps use URNs instead of URLs to address the images. In a URN you can
use your naming scheme. For this to work you have to provide a URLStreamHandler
and a URLConnection, which produce the streams. In the attached example you can
see how I added my own HTTP client.

The next step is exposing your protocol handler to the environment. The JDK
offers only a clumsy way to do that. You must define the system property
"java.protocol.handler.pkgs" to be a | separated list of package names in
which the protocol handler packages reside. Let's say, for example, that we
want to introduce the protocol "urn". A subdirectory "urn" containing the
handler and the connection class must exist in one of the packages specified
in the fore-mentioned system property.

After this URNs, will be considered valid by java.net.URL and the connection
manipulations for it will be directed to your classes for the complete JVM.

I think that implementing URLConnection.getInputStream() might be enough. In there
you make your connection with the database.

Regards,

Werner.

John Meyer wrote:
> Does xep provide any hooks to use application url resolution? Due to 
> security and design considerations, our application uses and internal 
> naming system and does not directly expose any of its contents via URL. 
> Unforetunately, I can’t find any way to allow the xep pdf producer to 
> find images in our database using our naming system. For xsl 
> transformations, we use the JAXP URIResolver interface and related 
> methods. I am hoping a similar solution could be used in the H4PDF class.
> 
>  
> 
> John Meyer
> 
> Senior Software Engineer
> 
> Clinician Support Technology
> 
>  
> 

-- 
Werner Donné  --  Re BVBA
Engelbeekstraat 8
B-3300 Tienen
tel: (+32) 486 425803	e-mail: werner.donne at re.be
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