Hi Craig,
It looks like from the code we could do with some Jersey-specific
functionality so the application can obtain the most acceptable media
type.
I know JAX-RS does not specify this but Jersey does know what is the
most acceptable media type is (if any, which may be a wildcard) before
the matching resource method is invoked. Thus this could be exposed.
Paul.
Begin forwarded message:
> From: craigmcc_at_dev.java.net
> Date: January 9, 2009 4:52:09 AM CEST
> To: commits_at_jersey.dev.java.net
> Subject: svn commit: r1832 - trunk/jersey/contribs/jersey-atom-
> abdera/src/test/java/com/sun/jersey/atom/abdera/impl/provider/entity/
> TestingResource.java
> Reply-To: commits_at_jersey.dev.java.net
>
> Author: craigmcc
> Date: 2009-01-09 03:52:05+0000
> New Revision: 1832
>
> Modified:
> trunk/jersey/contribs/jersey-atom-abdera/src/test/java/com/sun/
> jersey/atom/abdera/impl/provider/entity/TestingResource.java
>
> Log:
> Add some logic that determines which of the media types listed in
> @Produces
> we are actually going to be sending.
>
>
> Modified: trunk/jersey/contribs/jersey-atom-abdera/src/test/java/com/
> sun/jersey/atom/abdera/impl/provider/entity/TestingResource.java
> Url: https://jersey.dev.java.net/source/browse/jersey/trunk/jersey/contribs/jersey-atom-abdera/src/test/java/com/sun/jersey/atom/abdera/impl/provider/entity/TestingResource.java?view=diff&rev=1832&p1=trunk/jersey/contribs/jersey-atom-abdera/src/test/java/com/sun/jersey/atom/abdera/impl/provider/entity/TestingResource.java&p2=trunk/jersey/contribs/jersey-atom-abdera/src/test/java/com/sun/jersey/atom/abdera/impl/provider/entity/TestingResource.java&r1=1831&r2=1832
> =
> =
> =
> =
> =
> =
> =
> =
> ======================================================================
> --- trunk/jersey/contribs/jersey-atom-abdera/src/test/java/com/sun/
> jersey/atom/abdera/impl/provider/entity/TestingResource.java
> (original)
> +++ trunk/jersey/contribs/jersey-atom-abdera/src/test/java/com/sun/
> jersey/atom/abdera/impl/provider/entity/TestingResource.java
> 2009-01-09 03:52:05+0000
> @@ -38,12 +38,18 @@
> package com.sun.jersey.atom.abdera.impl.provider.entity;
>
> import com.sun.jersey.atom.abdera.ContentHelper;
> +import java.lang.annotation.Annotation;
> +import java.lang.reflect.Method;
> +import java.util.ArrayList;
> +import java.util.List;
> import javax.ws.rs.GET;
> import javax.ws.rs.Path;
> import javax.ws.rs.Produces;
> import javax.ws.rs.core.Context;
> import javax.ws.rs.core.MediaType;
> +import javax.ws.rs.core.Request;
> import javax.ws.rs.core.Response;
> +import javax.ws.rs.core.Variant;
> import org.apache.abdera.model.Entry;
>
> /**
> @@ -55,10 +61,14 @@
> @Context
> ContentHelper contentHelper;
>
> + @Context
> + Request request;
> +
> @GET
> @Path("categories")
> @Produces({"application/atomcat+xml", "application/xml", "text/
> xml", "application/atomcat+json", "application/json"})
> public Response getCategories() {
> + dumpSelectedMediaType("getCategories");
> return Response.ok(TestingFactory.createCategories()).build();
> }
>
> @@ -66,6 +76,7 @@
> @Path("content")
> @Produces("application/xml")
> public Response getContent() {
> + dumpSelectedMediaType("getContent");
> Entry entry = TestingFactory.createEntry();
> ContentBean bean = new ContentBean("foo value", "bar value");
> contentHelper.setContentEntity(entry,
> MediaType.APPLICATION_XML_TYPE, bean);
> @@ -76,6 +87,7 @@
> @Path("entry")
> @Produces({"application/atom", "application/atom+xml",
> "application/xml", "text/xml", "application/atom+json", "application/
> json"})
> public Response getEntry() {
> + dumpSelectedMediaType("getEntry");
> return Response.ok(TestingFactory.createEntry()).build();
> }
>
> @@ -83,6 +95,7 @@
> @Path("feed")
> @Produces({"application/atom", "application/atom+xml",
> "application/xml", "text/xml", "application/atom+json", "application/
> json"})
> public Response getFeed() {
> + dumpSelectedMediaType("getFeed");
> return Response.ok(TestingFactory.createFeed()).build();
> }
>
> @@ -90,7 +103,55 @@
> @Path("service")
> @Produces({"application/atomsvc+xml", "application/xml", "text/
> xml", "application/atomsvc+json", "application/json"})
> public Response getService() {
> + dumpSelectedMediaType("getService");
> return Response.ok(TestingFactory.createService()).build();
> }
>
> + private void dumpSelectedMediaType(String methodName) {
> + System.out.println("Method " + methodName + " selected
> media type " + calculateSelectedMediaType(methodName));
> + }
> +
> + /**
> + * <p>Calculate and return the media type that we should be
> producing
> + * on this call, following the same algorithm that JAX-RS
> does.</p>
> + *
> + * @param methodName Name of the method (in this class) that
> was called
> + *
> + * @exception IllegalArgumentException if we cannot identify
> the appropriate
> + * @Produces annotation for this method name
> + */
> + private MediaType calculateSelectedMediaType(String methodName) {
> + // Reflect to get the Method definition for this methodName
> + // The following logic assumes none of the method names are
> overloaded,
> + // which is true for this class but might not be in general
> + Method[] methods = this.getClass().getDeclaredMethods();
> + Method method = null;
> + for (int i = 0; i < methods.length; i++) {
> + if (methodName.equals(methods[i].getName())) {
> + method = methods[i];
> + break;
> + }
> + }
> + if (method == null) {
> + throw new IllegalArgumentException("Cannot find Method
> instance for method " + methodName);
> + }
> + // Look for the @Produces annotation on this method
> + Annotation annotation = method.getAnnotation(Produces.class);
> + if (annotation == null) {
> + throw new IllegalArgumentException("Method " +
> methodName + " does not have an @Produces annotation");
> + }
> + // Build a list of Variants based on the @Produces annotation
> + List<Variant> variants = new ArrayList<Variant>();
> + String[] items = ((Produces) annotation).value();
> + for (String item : items) {
> + String[] parts = item.split("/");
> + if (parts.length != 2) {
> + throw new IllegalArgumentException("Media type " +
> item + " on @Produces list for method " + methodName + " is
> malformed");
> + }
> + variants.add(new Variant(new MediaType(parts[0],
> parts[1]), null, null));
> + }
> + // Return the media type from the variant that was selected
> + return request.selectVariant(variants).getMediaType();
> + }
> +
> }
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: commits-unsubscribe_at_jersey.dev.java.net
> For additional commands, e-mail: commits-help_at_jersey.dev.java.net
>