When creating a resource (POST /items) i was a bit annoyed by the fact
that my implementation has a dependency on jax-rs classes: it uses
response builder to build a 201 response. This also pollutes my
service interface, since the return value has to be a Response.
To fix this, i introduced an annotation which gets handled by the
interceptor code below:
@RespondWithStatus(status=HttpServletResponse.SC_CREATED,name="Location",value="/items/{return}")
I'm using this interceptor-construction to hack the response and turn
it into a 201 with a Location header (leaving the entity like it is).
Now my service implementation class or interface has no dependencies
on jax-rs (it just returns a String, which will be used to replace the
{return} placeholder.
I'ld like to get some feedback on this trick. Is there anything
"built-in" that i could have used?
@Provider
@ServerInterceptor
public class RespondWithStatusAndHeaderInterceptor implements
PostProcessInterceptor {
@Context HttpServletRequest req;
public void postProcess(ServerResponse arg0) {
for (Annotation a : arg0.getAnnotations()) {
if (a.annotationType().equals(RespondWithStatus.class)){
RespondWithStatus x = (RespondWithStatus) a;
String template = x.value();
String rv = arg0.getEntity().toString();
int u = template.indexOf("{return}");
int y = template.indexOf('?');
rv = (u < y || y == -1) ?
org.jboss.resteasy.util.Encode.encodePath(rv) :
org.jboss.resteasy.util.Encode.encodeQueryParam(rv);
String p =
req.getScheme()+"://"+req.getServerName()+":"+req.getServerPort()+req.getContextPath()+req.getServletPath();
String rep = template.replace("{return}",rv);
if (!"".equals(x.name())) {
arg0.getMetadata().add(x.name(), p+rep);
}
arg0.setStatus(x.status());
}
}
}
@Retention(RetentionPolicy.RUNTIME)
public static @interface RespondWithStatus {
int status();
String name() default "";
String value() default "";
}
}
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