extension questions

[Jeff Cutler-Stamm <jc...@thinkshare.com>]

hi all, new to the list so pls forgive me if this has been addressed
before...

i would like to write a Java Xalan extension which retrieves an xml document
from somewhere (say a URL or a database), creates a DOM from it, and then
applies the _current_ stylesheet to it in the current instance of the xalan
processor as if the DOM were grafted onto the source tree somewhere and then
<xsl:apply-templates /> were called on it. Can anyone suggest a good way to
achieve this? I tried actually modifying the source tree but got
DTMExceptions - looks like the tree is not editable.

thx.
-Jeff

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
| Jeff Cutler-Stamm     Co-Founder  |
| jcs@thinkshare.com    ThinkShare/ |
| 503.756-4100           MetaTree   |
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Re: extension questions

[Keith Visco <kv...@exoffice.com>]

You should put your Database code in a servlet if you can, which is
accessible via a URL call. This will allow you to continue to just use
the document() function and allow you to remain compatible with the XSLT
spec.

--Keith


Jeff Cutler-Stamm wrote:
> 
> i'm not garaunteed to have a URL. my document is the result of some internal
> processing which might involve accessing another URL or a database of some
> kind but my extension is the thing that actually needs to create the DOM.
> one method I tried was:
> 
>  XSLTEngineImpl.setSourceDocument( "myFakeUrl", myDomTree );
> 
> in my extension and then used document("myFakeUrl") in the stylesheet but
> that didn't seem to work (e.g. <xsl:apply-templates
> select="document('myFakeUrl')" /> returns nothing whereas if you give
> document() a file system path to an XML file it does work. The javadoc
> indicates that setSourceDocument() adds the Url->Document mapping to a table
> so that the next time it is requested, that Document object is used rather
> than the Url being evaluated again but this doesn't seem to be working.
> 
> regards,
> jeff
> 
> >
> > You could just use the document() function if you just have a URL.
> >
> > --Keith
> >

RE: extension questions

[Jeff Cutler-Stamm <jc...@thinkshare.com>]

i'm not garaunteed to have a URL. my document is the result of some internal
processing which might involve accessing another URL or a database of some
kind but my extension is the thing that actually needs to create the DOM.
one method I tried was:

 XSLTEngineImpl.setSourceDocument( "myFakeUrl", myDomTree );

in my extension and then used document("myFakeUrl") in the stylesheet but
that didn't seem to work (e.g. <xsl:apply-templates
select="document('myFakeUrl')" /> returns nothing whereas if you give
document() a file system path to an XML file it does work. The javadoc
indicates that setSourceDocument() adds the Url->Document mapping to a table
so that the next time it is requested, that Document object is used rather
than the Url being evaluated again but this doesn't seem to be working.

regards,
jeff

>
> You could just use the document() function if you just have a URL.
>
> --Keith
>

Re: extension questions

[Keith Visco <kv...@exoffice.com>]

You could just use the document() function if you just have a URL. 

--Keith

Jeff Cutler-Stamm wrote:
> 
> hi all, new to the list so pls forgive me if this has been addressed
> before...
> 
> i would like to write a Java Xalan extension which retrieves an xml document
> from somewhere (say a URL or a database), creates a DOM from it, and then
> applies the _current_ stylesheet to it in the current instance of the xalan
> processor as if the DOM were grafted onto the source tree somewhere and then
> <xsl:apply-templates /> were called on it. Can anyone suggest a good way to
> achieve this? I tried actually modifying the source tree but got
> DTMExceptions - looks like the tree is not editable.
> 
> thx.
> -Jeff
> 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> | Jeff Cutler-Stamm     Co-Founder  |
> | jcs@thinkshare.com    ThinkShare/ |
> | 503.756-4100           MetaTree   |
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~