CODEWITHSUNDEEP
javajakarta-eerestjaxbjersey
Laurens
Laurens

Reputation: 2088

Creating an absolute URI using the UriBuilder from an XmlAdapter

I have an XmlAdapter to marshal associated objects in a class to their respective REST URI's:

public class AirportAdapter extends XmlAdapter<URI, Airport> {

@Override
public URI marshal(Airport airport) throws Exception {
    return UriBuilder.fromResource(AirportsResource.class).path(AirportsResource.class,
            "getAirportResource").build(airport.getId());
}

This, however, yields a relative URL (/airports/1) that is unable to unmarshal the URI into an Airport object (obviously):

    @Override
    public Airport unmarshal(URI uri) throws Exception {
        // Does work, but not desirable
        return JAXB.unmarshal("http://localhost/resources" + uri, Airport.class)
        // Does not work
        return JAXB.unmarshal(uri, Airport.class);
    }
}

I need the UriBuilder to build an absolute path (http://localhost/resources/airports/1) and I understand I can do this using the UriInfo class, but I can't inject it into the adapter because it's not a resource. When I prepend the URI with the protocol, host and resources path, the unmarshalling does work. What way is there to get the UriBuilder to build an absolute path without preprending it myself?

Update

I figured if I create a JAXB context myself:

JAXBContext jc = JAXBContext.newInstance( "com.acme.foo:com.acme.bar" );
Unmarshaller u = jc.createUnmarshaller();

and set the adapters on the unmarshaller myself, passing the entity manager to grab the correct object from the database instead of umarshalling via the URI, would these be used by the framework as well or does it create new instances himself, rendering this approach mute?

Upvotes: 1

Views: 2598

Answers (1)

bdoughan
bdoughan

Reputation: 149017

If you set an instance of an XmlAdapter on a Marshaller/Unmarshaller then that instance of the XmlAdapter will be used in all places that have been annotated with @XmlJavaTypeAdapter to use that class.

In a JAX-RS environment such as Jersey, you can set this up using a MessageBodyReader/MessageBodyWriter.

Upvotes: 1

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