Re: [jibx-users] Share parts of a binding

[Dennis Sosnoski]

Thomas Will wrote:

Hi, can parts of a binding be shared?

I've got many (dozens) different XML structures, all
sharing a common structure part:
XML A:
<Container> (always same element name)
 <Common> (always same element name)
   ...(always the same structure)...
 </Common>
 <SpecificA> (different element name)
   ...(different structure)...
 </SpecificA>
</Container>
XML B:
<Container> (always same element name)
 <Common> (always same element name)
   ...(always the same structure)...
 </Common>
 <SpecificB> (different element name)
   ...(different structure)...
 </SpecificB>
</Container>
I'd like to map to these Java types:
public class Container {
 private Common common;
 private Specific specific;
}
public interface Specific {}
public class SpecificA implements Specific {...}
public class SpecificB implements Specific {...}
Additional constraints:
Separate binding files for the different XML
structures are necessary. I cannot use one huge
binding file.
As of now there's no way to share structures between files. Beta 4 plans 
to provide an <include> capability that will allow you to use libraries 
of definitions that can be shared across bindings.

The types Container, Common, and Specifc would be in a
separate reusable library jar.
Unmarshalling: I know at compile time which XML
structure I receive, i.e. which binding to use. No
runtime introspection necessary.
Marshalling: I know at compile time which Specific
structure I have, i.e. which binding to use. No
runtime Java type determination necessary.
The Container really just contains the two shown
elements; thus it would be easy to construct the
container manually after (separately?) unmarshalling
the two contained elements. But ideally the XML
document should be parsed only once (together for the
common and the spceific part).
Questions:
How can the mapping for the Common part be resused in
different (un)marshallings?
I might could use
UnmarshallingContext.setFromContext(...)?
Any ideas on the marshalling side?
In theory you can do the equivalent of 
UnmarshallingContext.setFromContext() on the marshalling side with 
getXMLWriter()/setXMLWriter(). I haven't tested this, though. The 
general case of one binding definition making runtime use of another 
binding definition is definitely something of interest, so if you try 
this out and run into any problems please enter bug reports.

 - Dennis



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