Hi all,
I've been playing with building a REST web service to handle
polymorphism... It's a long post, but bear with me :-)
In particular, I may have:
@Path("/")
class WebStore {
@POST
@Path("/customers/")
Response addCustomer(Customer c) {
...
}
}
But I have a base class of Customer, but also inherited classes of
AwesomeCustomer, and SuperAwesomeCustomer. Things get more complicated
when EMF kicks in, where I actually have a Customer interface and
CustomerImpl class.
The previous declaration doesn't work when I post a customer XML snippet, say:
<customer><name>simon</name></customer>
Because Customer is an interface, so cannot be annotated with
@XmlRootElement. As a result, the error of "no message body reader can
be found" is raised...
If we change the POST function this way, it can work:
@POST
@Path("/customers/")
Response addCustomer(CustomerImpl c) {
...
}
But, this breaks again, when I add the following:
@POST
@Path("/customers/")
Response addCustomer(CustomerImpl c) {
...
}
@POST
@Path("/customers/")
Response addCustomer(AwesomeCustomerImpl c) {
...
}
@POST
@Path("/customers/")
Response addCustomer(SuperAwesomeCustomerImpl c) {
...
}
Here, if I post a SuperAwesomeCustomerImpl object to "/customers", the
ws would find all the functions that can handle "POST to /customers",
which will include all three functions above. However, in
"src/rt/frontend/jaxrs/src/main/java/org/apache/cxf/jaxrs/utils/JAXRSUtils.java",
public static OperationResourceInfo findTargetMethod(), we have:
if (!candidateList.isEmpty()) {
Map.Entry<OperationResourceInfo, MultivaluedMap<String,
String>> firstEntry =
candidateList.entrySet().iterator().next();
//---------> This only looks at the first function that
matches, while not look at the class hierarchy...
values.clear();
values.putAll(firstEntry.getValue());
OperationResourceInfo ori = firstEntry.getKey();
Hopefully, I am not overwhelming everyone with too much information.
But is there a fix to this problem? I guess maybe add some class
hierarchy-awareness to findTargetMethod()?
Thanks!
-Simon
