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From: Ugo Cei <ugo@apache.org>
Subject: Re: generator type value substitution
Date: Thu, 29 Apr 2004 00:05:05 +0200
To: dev@cocoon.apache.org

Il giorno 28/apr/04, alle 20:44, Leszek Gawron ha scritto:

>> Missed the original e-mail, why not just push the problem down a 
>> level:
>>
>> 	<map:generate type="superGenerator" src="{1}"/>
>>
>> SuperGenerator can then figure out what to do by looking at the
>> source...
> I have already thought of that but the problemis that here the 
> "source" is the
> generator name. Do you know how should I lookup a generator, setup it 
> properly
> (to support map:parameter for example) and than invoke it? with 
> everything
> done not to break sitemap reloading (new generators may come in place, 
> old may
> be deleted), caching and other stuff I cannot really comprehend :)

Wrap and delegate:

<map:generate src="superGenerator" src="uri">
   <map:parameter name="class" value="GeneratorX"/>
</map:generate>

public class SuperGenerator implements Generator {

   Generator specialGenerator;

   public void setup(SourceResolver resolver, Map objectModel, String 
srcURI, Parameters par) {
     specialGenerator = (Generator) 
Class.forName(par.getParameter("class")).newInstance();
     specialGenerator.setup(resolver, objectModel, srcURI, par);
   }

   public void generate() {
     specialGenerator.generate();
   }
}

You could also make all your generators Avalon components and retrieve 
them via a ServiceManager, if you wish, instead of using Class.forName.

Hope you get the idea.

	Ugo