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From Steven Dolg <>
Subject Re: REST / Can't find URLResponseBuilder
Date Tue, 01 Dec 2009 16:14:07 GMT
Johannes Lichtenberger schrieb:
> On Sun, 2009-11-29 at 07:32 +0100, Jos Snellings wrote:
>> In the samples, a typical use of StringTemplate is shown: a page is to
>> be interpreted by the StringTemplate engine, and a number of properties
>> are passed via the hashtable.
>> The idea is that you would open a view on the object.
>> So, 
>> - the query points to a resource
>> - the controller decodes what the resource is and what you want (view
>> it, update it?)
>> - the way to view it could be: pass my resource to a StringTemplate
>> invocation:  new Page('stringtemplateinvocation',resource);
>> However, I have not tried to elaborate this so far. Shall I post it when
>> i have a useable example?
> Yes it would be great. My concern is that I don't want to display a
> template page. I want to process the request (the parameters Google
> Earth sends when zooming in) and within my Generator query a native XML
> database system and built the algorithmic logic inside the generator
> (what data out of the shreddered xml file is needed and has to be
> transformed with an XSLT stylesheet). So I basically know how RESTful
> webservices work, but I don't know how to use cocoon3 in this case (I
> assume new Page(...) isn't the right thing to return when I just want to
> pass the request params to my generator. So I don't want to use
> StringTemplate in this case (but it's nontheless a great thing). So the
> query points to a controller, which decides that it's a GET request
> (view) and passes the parameters on to my generator (which I still have
> to write). 
> Would be great if you or someone else could help me out (it's a project
> in a course of our university ;-) and I thought cocoon is great for this
> concern (get RESTful parameters, hand it on to a generator which selects
> the needed data out of a shreddered xml file according to the
> parameters, then transform the xml fragments with a XSLT stylesheet and
> serialize the result, so that Google Earth can use the KML fragments
> generated).


I'm not entirely sure I understand what you want to do (or to be more 
precise which parts already exist and which don't), but I'll try to 
I can imagine two approaches:

You can access HTTP request parameters from a generator (or any other 
PipelineComponent - a Controller is just a fancy PipelineComponent) as well.
The SitemapServlet will add all HTTP request parameters to the 
invocation that is built to handle the request and will be passed to 
every PipelineComponent in the 
Object>)" method. The keys will be the names of the HTTP request parameters.
Read the parameters in your generator, and then perform the rest of your 

Keep the controller and do all pre-processing necessary within the 
controller: the XML DB, XSLT (if you just want to use XLST have a look 
at org.apache.cocoon.sax.util.TransformationUtils) etc.
When you are ready, store the data required for your generator in a 
parameter map (just like you did in the code fragment you posted) and 
delegate to a pipeline that uses your generator.
The generator will be able to access the data the same way I described 
Only difference would be that in this case the key would be defined by 
your controller, while in the approach above the key would be determined 
by the name of the HTTP request parameter.


> Thank you,
> Johannes

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