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From Nilupa Bandara <nilupa.manamp...@gmail.com>
Subject Re: [JiBX DataBinding] Question on handling Simple Types
Date Fri, 18 Jun 2010 21:27:41 GMT
On Fri, Jun 18, 2010 at 4:33 AM, Daniel Kulp <dkulp@apache.org> wrote:

>
> Well, another option to consider (I'm not saying this is the way to go,
> just
> something to consider.  I don't even know if this is possible with JIBX) is
> how the JAXWS/JAXB code handles this....
>
> With JAX-WS/JAXB, it uses ASM to generate, in memory, classes for the
> wrapper
> element which contains all the JAXB annotations and such necessary to
> completely read/write the entire message body.   There is then a
> WrapperHelper
> to pull the individual params out of that object.   Thus, JAXB doesn't see
> the
> <arg0>Alice</arg0>, it sees the entire message as a structure.
>
> Right now, the creation of the wrapper beans is done in the JAX-WS
> frontend,
> but I could definitely see pushing that into the JAXB databinding and allow
> other databindings to do the same.   If you think it's possible with JIBX,
> it's something we could look into more.
>
> The other option would be to just handle it yourself.   Get the element
> text,
> you know the Class, since it would just be the primitives, the number of
> cases
> you need to handle is pretty small and most of the code is probably already
> in
> Aegis someplace.
>


I think the right way to generate the wrapper beans with JiBX framework is
to use its tools and feed the schema or the binding definitions as
appropriate. As far as I know, a set of wrapper classes are generated for
those simple types that are used. In other words if the service author
wishes to expose a Java bean as a Web service which purely uses compiled or
generated Java beans using JiBX framework internally, this issues doesn't
occurs as we don't have to deal with simple types directly since they are
already contained in some wrapper Java beans. We can use the JiBX framework
to unmarshall them for us in the usual way.

We have to deal with this only we expose a Java bean like in the example
which is neither generated or compiled bean using jibx framework, but rather
simple bean which all its method inputs and outputs are simple types.
Perhaps in such cases, it is reasonable to handle it on our own as we do it
right now since there is only  a few number of cases. In the solution I've
opted to use the NullBindingFactory for unmarshalling they simple types
which mimics the IBandingFactory used to unmarshall complied Java beans
using jibx framework (in fact I took that piece of code from Axis2 JiBX
implementation)

Nilupa


>
> Dan
>
>
>
> On Thursday 17 June 2010 8:58:36 pm Nilupa Bandara wrote:
> > Hi,
> >
> > Consider the following Java class which provides simple echoString
> service.
> >
> > public interface EchoService {
> >
> >     String echoString(String content);
> > }
> >
> > I exposed it as a Web service using the following code.
> >
> > EchoServiceImpl echoServiceImpl = new EchoServiceImpl();
> > ServerFactoryBean svrFactory = new ServerFactoryBean();
> > svrFactory.setServiceClass(EchoService.class);
> > svrFactory.setAddress("http://localhost:8080/EchoService");
> > svrFactory.setServiceBean(echoServiceImpl);
> > svrFactory.getServiceFactory().setDataBinding(new JiBXDataBinding());
> > svrFactory.create();
> >
> > It produces the correct output for the following input.
> >
> > <soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
> >    <soap:Body>
> >       <ns1:echoString xmlns:ns1="
> http://simple_types.jibx.xcf.apache.org/">
> >          <ns1:arg0>Alice</ns1:arg0>
> >       </ns1:echoString>
> >    </soap:Body>
> > </soap:Envelope>
> >
> > My question is the following.
> >
> > When the CXF framework receives the message, it invokes the
> JiBXDataReader
> > to unmarshall  xml content which is "<ns1:arg0>Alice</ns1:arg0>".
>  However
> > it seems that I can't unmarshall it using
> > unmarshallingContext.unmarshallElement(..) method since
> UnmarhallingContext
> > can't be obtained for "<ns1:arg0>Alice</ns1:arg0>". That is because
> > "<ns1:arg0>Alice</ns1:arg0>" element doesn't corresponds to a Java
> classes
> > compiled with binding info. One work around would be to use
> > the JibxNullBindingFactory[2]  to imitate the IBindingFactory interface
> for
> > simple types.
> >
> > So should we proceed with the above workaround /  Is there a better way
> of
> > doing it? Or should we completely ignore above case and support only the
> > exposure of Java beans compiled with binding information. (i.e. the
> > echoString method should be change to something like  Output
> > echoString(Input) where both Input, Output are Java beans compiled with
> > binding information. Input, Output act as wrapper classes for the string
> > content going to-and-from)
> >
> > Any thoughts ?
> >
> > Nilupa
> >
> > [1] Updated JiBX DataBinding implementation code is available at :
> > http://github.com/nilupa/cxf/tree/trunk/rt/databinding/jibx/
> > [2]
> >
> http://github.com/nilupa/cxf/blob/trunk/rt/databinding/jibx/src/main/java/o
> > rg/apache/xcf/jibx/JibxNullBindingFactory.java
>
> --
> Daniel Kulp
> dkulp@apache.org
> http://dankulp.com/blog
>



-- 
Nilupa Bandara

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