Re: Detecting requested variant based upon file extension

[Thierry Boileau]

Hi Chuck,

I send you a sample code where a resource generates a representation
according to the file extension.
It doesn't rely on a Filter, but seems to work.
the code illustrate 2 cases, the first one where the Resource knows
the mappings between extensions and metadata, the second one where the
resource relies on the parent application metadataService:

**************************
        // Case 1 - without the Application metadata service
        if ("js".equals(ext)) {
            getVariants().add(new Variant(MediaType.APPLICATION_JSON));
        } else if ("xml".equals(ext)) {
            getVariants().add(new Variant(MediaType.APPLICATION_ATOM_XML));
        } else {
            // What you want, even let the Variants set empty (will return 404
            // response)
            getVariants().add(new Variant(MediaType.TEXT_PLAIN));
        }

        // Case 2 - uses the Application metadata service
        Application application = (Application) context.getAttributes().get(
                Application.KEY);
        Metadata metadata = application.getMetadataService().getMetadata(ext);
        if (metadata != null && metadata instanceof MediaType) {
            getVariants().add(new Variant((MediaType) metadata));
        } else {
            // What you want, even let the Variants set empty (will return 404
            // response)
            getVariants().add(new Variant(MediaType.TEXT_PLAIN));
        }

**************************
I hope this will help you.

Best regards,
Thierry Boileau


On Thu, Mar 6, 2008 at 9:48 AM, Stephan Koops <[EMAIL PROTECTED]> wrote:
> Hello Chuck,
>
> > Thanks - I'll crank out a filter.
>  >
>  > One quick question...it's clear to me how I'd get the extension, and how to
>  > lookup the metadata, but it's not clear how to propagate that to the 
> resource.
>  >  How do I properly set the variant.
>  I think you mean request.getClientInfo.setAcceptedMediaTypes(...) and
>  request.getClientInfo.setAcceptedLanguages(...) .
>
>  Let me now, if you are ready; I need this filter also.
>
>   best regards
>    Stephan
>

testExtension.jar
Description: application/java