We are evaluating using JiBX extensively to map existing Java classes/interfaces
to/from XML. We have a few questions that our research has not quite clarified.
Maybe answers to these would help others as well. Trying to break our experiments
out is a little tough...we tried to research multiple problems at once, so bear
with me.
3. If we defined a mapping to a general form of an object and want to extend it
without having to write an entirely new unmarshaller, for example, can we
"borrow" or extend the functionality of the basic object?
For example.
We understand that we need to write a custom unmarshaller to allow for a call
such as Person.addAddress(AddressType, Address)...since it has a two argument
setter.
The XML may require things to look this way:
<Person>
<Address type="current">
etc.
</Address>
<Address type="former">
etc.
</Address>
</Person>
Given that we'd like to treat our objects the way we have them, with type being
an attribute of the association between Person and Address, the type attribute in
the XML is not really part of the mapping for address. Is there a way to write a
mapping in the binding file for Address that ignores the type and then create a
structure within the <Person> mapping for <Address> in this particular context
and write a custom unmarshaller for the structure that does something like: get
the marshaller we'd use for Address that ignores the type and unmarshal...then,
look at the type attribute and take the result and using it in our addAddress
call on Person.
On a related note, what about having two mappings, one for current addresses and
one for former (or maybe US address vs international) and use the type attribute
in the XML to determine which mapping (marshaller/unmarshaller) to use?
I realize we are asking long questions as newbies. It's hard to know what
approaches to take at such an early stage, but we need to mitigate risk, knowing
what we are facing and whether it will fit with what we've already got.
- Christian
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