Hi
On 25/11/11 18:21, Lin, Tao wrote:
Hi,
I would like to write a custom provider, which extends a default provider in
CXF. I would also like to make the custom provider only handles the resources
my application exposes. It should be possible since the requested resource can
be obtained through UriInfo object (UriInfo.getMatchedResources()), which is
injected into the provider directly or indirectly .
However, UriInfo is only available in writeTo() but not in isWriteable(). Here
is the sample code to demonstrate the problem:
~~
@Produces("application/json")
@Consumes("application/json")
@Provider
public class MyJSONProvider extends JSONProvider
{
@Context MessageContext context;
@Override
public boolean isWriteable(Class<?> type, Type genericType, Annotation[]
annotations, MediaType mt)
{
UriInfo uriInfo = context.getUriInfo();
List<Object> resources = uriInfo.getMatchedResources(); // throw null
pointer at this line
return Customer.class.isAssignableFrom(type);
}
@Override
public void writeTo(Object obj, Class<?> cls, Type genericType, Annotation[]
anns, MediaType m, MultivaluedMap<String, Object> headers, OutputStream os)
throws IOException
{
UriInfo uriInfo = context.getUriInfo();
List<Object> resources = uriInfo.getMatchedResources();
super.writeTo(obj, cls, genericType, anns, m, headers, os);
}
}
~~
In the writeTo() method, uriInfo contains the information I need while in the
isWriteable(), uriInfo is null. But what I really want is the uriInfo available
in isWriteable().
Here is my question:
is this by design or simply a bug?
To me, this is a bug.
I'll probably agree; I've been aware of it, the reason I've never done
it that all the the injection is kind of not cheap so I thought I'd only
get the code injecting contexts only for the chosen provider.
I'll investigate a bit more, and get back on this issue
Cheers, Sergey
Thanks,
Tao
--
Sergey Beryozkin
http://sberyozkin.blogspot.com
Talend Community Coders
http://coders.talend.com/
