RE: Using a custom URIResolver

In Saxon, calling getURIResolver() on the Transformer object will give you
the standard URI resolver if no user-defined URIResolver has been set;
however, the JAXP specification isn't explicit that this is what should
happen, and I've no idea if Xalan does the same.

My thinking was that you write your URIResolver something like

public MyURIResolver(URIResolver systemURIResolver) {
  this.systemURIResolver = systemURIResolver;

  public Source resolve(href, base) {
     Source s = null;
     try {
           s = systemURIResolver.resolve(href, base);
     } catch (TransformerException e) {
         s = null;
     }
     if (s == null) {
         // handle it here
   }
}

Then you can set this up (assuming Xalan behaves like Saxon) as:

   Transformer t = templates.newTransformer();
   MyURIResolver u = new MyURIResolver(t.getURIResolver());
   t.setURIResolver(u):

Michael Kay

-----Original Message-----
From: Björn Boxstart [mailto:Boxstart(_at_)dcdds(_dot_)nl] 
Sent: 06 April 2004 08:30
To: xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com
Subject: RE: [xsl] Using a custom URIResolver

Michael Kay wrote:

I'm not sure there is a portable way to do this. Given a

specific JAXP implementation (such as Saxon or Xalan) you can 
do it by making your

URIResolver be a subclass of the standard URIResolver, and

invoking the

super.resolve() method. You could make it a bit more

portable by having = your URIResolver accept a reference to 
the standard URIResolver

using a setStandardURIResolver() method when it is first

instantiated.

Thanks for your reaction. I'm indeed using trax (with xalan, 
I've should have told this in my previous email). The thing 
is that javax.xml.transform.URIResolver is an Interface and 
that I have not been able yet to find out which class 
implements this interface to perform as the standard URI 
resolver. So I don't know which class to subclass. Could you 
please explain what you mean with 'accept a reference to the 
standard URIResolver using a setStandardURIResolver()' method.
Do you mean that I add a public method 
'setStandardURIResolver' to my own class that implements the 
interface (or to let the standard URI resolver be passed as a 
parameter in the constructor) and that the value being passed 
to this method can be retrieved from the transformer by using 
the 'getURIResolver()' method, or does this method only 
return a URI resolver in case you set your own resolver before?

Thanks in advance for your reaction!

Björn

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