Hi
My understanding is that you can get @Context values injected as method parameters
of subresource locator resource methods
Cheers, Sergey
> I'm playing with a use case of using JAX-RS for AtomPub feeds and
> entries, extending from the example in Marc's blog last February[1].
> One of the first things you notice when trying this is that you need to
> be able to convert your data objects into Atom entries in two different
> resources ... one as part a GET for the feed, and one when the entry is
> requested individually. Sounds like a good opportunity to share some
> logic, so I'm modeling things like this:
>
> @Path("customers")
> public class CustomersResource {
> ...
> // Sub-resource locator
> @Path("{id}")
> public CustomerResource getCustomerResource() {
> return new CustomerResource();
> }
> ...
> // Return an Atom feed containing the entire collection
> @GET
> public Response find() {
> ...
> CustomerResource resource = getCustomerResource();
> List<Customer> customers = ... find the relevant customers ...;
> for (Customer customer : customers) {
> Entry entry = resource.formatEntry(customer);
> ... add this to the feed representation ...
> }
> ...
> }
> }
>
> public class CustomerResource {
> ...
> // Return an Atom entry for the specified customer id
> @GET
> public Entry find(@PathParam("id") String id) {
> Customer customer = ... look up customer by id ...
> Entry entry = formatCustomer(customer);
> return entry;
> }
> ...
> // Utility method called from both our find() method and
> CustomersResource#find()
> public Entry formatCustomer(Customer customer) {
> ... format this customer as an Atom entry and return ...
> }
> ...
> }
>
>
> The problem I'm having is that the sub-resource instance returned by
> getCustomerResource() does not receive any injections like "@Context
> UriContext context". Thus, if my formatCustomer() method tries to
> access the context (in my case, so that I can generate link URIs based
> on the base URI of this request), I get NPEs.
>
> How can I code the getCustomerResource() method in such a way that the
> returned instance gets injections performed in the usual way? I'd
> imagine that I would need to invoke some factory method provided by the
> JAX-RS implementation, but it's not clear how one might accomplish that.
>
> Craig
>
> [1]
> http://weblogs.java.net/blog/mhadley/archive/2008/02/integrating_jer_2.html
>
>
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