Re: Apache Xalan-J XSLTC: how to set for on-demand XSL compilation

[Morris Kwan]

Hi, Gaurav

You can set the "auto-translet" attribute to true. If "auto-translet" is
set to true, the TransformerFactory will create a Templates object from the
existing translet if the translet exists and its time stamp is newer than
the .xsl file, otherwise it will generate a new translet from the
stylesheet. The "auto-translet" and "generate-translet" options should not
be used with the "use-classpath" option. If they are used together,
"use-classpath" will take precedence.

Regards,

Morris Kwan
XSLT Development
IBM Toronto Lab
Tel: (905)413-3729
Email: [EMAIL PROTECTED]



                                                                           
             Gaurav                                                        
             <[EMAIL PROTECTED]                                             
             n.COM>                                                     To 
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             11/28/2003 02:34                                           cc 
             PM                                                            
                                                                   Subject 
                                       Apache Xalan-J XSLTC: how to set    
             Please respond to         for on-demand XSL compilation       
               Gaurav.Gandhi                                               
                                                                           
                                                                           
                                                                           
                                                                           
                                                                           




Summary:

I am trying to use Xalan-J's compilation based TransformerFactory to
create "Translets" on the fly. But dont know how to do that.
(http://xml.apache.org/xalan-j/xsltc_usage.html)

Details:

I set the concerned system property to point to Xalans compilation based
Transformer

   Properties props = System.getProperties();
   props.put("javax.xml.transform.TransformerFactory",
"org.apache.xalan.xsltc.trax.TransformerFactoryImpl");

and then set a couple of attributes as follows:

     transformerFactory.setAttribute("translet-name", convId);
     transformerFactory.setAttribute("destination-directory",
"/uwc_base/dist/JDK1.4_DBG.OBJ/WEB-INF/lib");
     transformerFactory.setAttribute("package-name", "com.blah.translets");
     transformerFactory.setAttribute("jar-name", "iabs-translets.jar");
     transformerFactory.setAttribute("generate-translet", Boolean.TRUE);
     transformerFactory.setAttribute("use-classpath", Boolean.TRUE);
       ....
    _templates = transformerFactory.newTemplates(new DOMSource(xslDoc));

Now, the "use-class" property = true, indicates that the the
TransformerFactorty should expect a precompiled Translet (Java Class
representation of XSL) at the ClassPath.
For this I will have to make sure that the translet is generated  before
the application starts.

If "use-class" property = false, the TransformerFactory will compile the
XSL into translet on its own.

I would like a way where XSLTranformerFactory determines on its own
whether a Translet is already existing. If yes, it shoud use it, and if
no it should generate it.
Is there a way that can be done by setting some attribute of the
factory, and without me having to write code to check the presence of
the translet?
I read from somewhere that setting the attribute "use-from-classpath" to
true, accomplishes that, but looks like the XSLTC factory does not
support that attribute.

Thanks in advance,
Gaurav