On 06/26/2013 02:21 PM, Nicolas Dubien wrote:
I am looking for an XLS-FO engine that can fit with my current
architecture. I am already using other engines which are based on other
technologies - not-XSL-FO. In our current architecture we are using
user-defined functions to add our proper features to the engine.
As a matter of fact, I was wondering if it is possible to integrate
user-defined functions in my XSL-FO templates and define them in Java.
Then your engine will call my Java function if necessary. I did not find
any solutions to do this on your website.
Here are examples of functions I would like to be able to call from your
engine during the generation:
* getResourceUrl("my resource name")
* ChangeCase($first_name_from_xml, "Upper")
* GetId($first_name_from_xml, $last_name_from_xml)
One of the engines I am using for the moment is FreeMarker, it has this
feature. It allows developers to wrap their own objects and send them to
their engine.
cf.
http://freemarker.sourceforge.net/docs/api/freemarker/template/Template.html#process%28java.lang.Object,%20java.io.Writer,%20freemarker.template.ObjectWrapper%29
XMLmind XSL-FO Converter is an XSL-FO processor. It starts its work
after an intermediate XSL-FO file has been generated.
See "How it works": http://www.xmlmind.com/foconverter/how_it_works.html
The vast majority of our customers use an XSLT stylesheet to generate
the intermediate XSL-FO file.
An XSLT engine (which interprets the XSLT stylesheet) such as Saxon 6
very easily supports user-defined functions written in Java.
See Saxon 6's "Writing extension functions":
http://saxon.sourceforge.net/saxon6.5.5/extensibility.html#Writing-extension-functions
This is why there is absolutely no need for us to be able to execute
calls to user-defined functions written in Java from our XSL-FO processor.
Example:
--> This is common and useful:
XSLT stylesheet:
---
<xsl:template match="html:img[@class='resource']">
<fo:external-graphic src="{my:getResourceUrl('my resource name')}"
xmlns:my="java:org.dubien.MyFunc.getResourceUrl"/>
</xsl:template>
---
which generates the following XSL-FO:
---
<fo:external-graphic src="url(file:/res/foo.png)"/>
---
--> This would be equivalent but more complex, not useful, and hence
*not* supported.
XSLT stylesheet:
---
<xsl:template match="html:img[@class='resource']">
<fo:external-graphic src="invoke(org.dubien.MyFunc.getResourceUrl('my
resource name'))"/>
</xsl:template>
---
which generates the following XSL-FO:
---
<fo:external-graphic
src="invoke(org.dubien.MyFunc.getResourceUrl('my resource name'))"/>
---
which would be then evaluated by XMLmind XSL-FO Converter as:
---
<fo:external-graphic src="url(file:/res/foo.png)"/>
---
--
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