I'd like to use Joda's DateTime for query parameters in Jersey, but this isn't supported by Jersey out-of-the-box. I'm assuming that implementing an InjectableProvider is the proper way to add DateTime support.
Can someone point me to a good implementation of an InjectableProvider for DateTime? Or is there an alternative approach worth recommending? (I'm aware I can convert from Date or String in my code, but this seems like a lesser solution).
Thanks.
Solution:
I modified Gili's answer below to use the @Context injection mechanism in JAX-RS rather than Guice.
import com.sun.jersey.core.spi.component.ComponentContext;
import com.sun.jersey.spi.inject.Injectable;
import com.sun.jersey.spi.inject.PerRequestTypeInjectableProvider;
import java.util.List;
import javax.
ws.rs.QueryParam;
import javax.
ws.rs.WebApplicationException;
import javax.
ws.rs.core.Context;
import javax.
ws.rs.core.Response;
import javax.
ws.rs.core.Response.Status;
import javax.
ws.rs.core.UriInfo;
import javax.
ws.rs.ext.Provider;
import org.joda.time.DateTime;
/**
* Enables DateTime to be used as a QueryParam.
* <p/>
* @author Gili Tzabari
*/
@Provider
public class DateTimeInjector extends PerRequestTypeInjectableProvider<QueryParam, DateTime>
{
private final UriInfo uriInfo;
/**
* Creates a new DateTimeInjector.
* <p/>
* @param uriInfo an instance of {@link UriInfo}
*/
public DateTimeInjector( @Context UriInfo uriInfo)
{
super(DateTime.class);
this.uriInfo = uriInfo;
}
@Override
public Injectable<DateTime> getInjectable(final ComponentContext cc, final QueryParam a)
{
return new Injectable<DateTime>()
{
@Override
public DateTime getValue()
{
final List<String> values = uriInfo.getQueryParameters().get(a.value());
if( values == null || values.isEmpty())
return null;
if (values.size() > 1)
{
throw new WebApplicationException(Response.status(Status.BAD_REQUEST).
entity(a.value() + " may only contain a single value").build());
}
return new DateTime(values.get(0));
}
};
}
}
