Thanks. I already was afraid JiBX needs to "know" which of B or C it's
unmarshalling at the time it sees the <Identifier1> element.
However, I am looking into creating my own IUnmarshaller implementation that
will probe the xml to see what implementation class the xml will resolve to. It
is my goal to make it a general purpose IUnmarshaller. If it leads to anything
useful, I will post my solution in this thread.
Regards,
Dave
On Feb 1, 2012, at 4:56 PM, Archie Cobbs wrote:
> On Wed, Feb 1, 2012 at 9:31 AM, Dave Schoorl wrote:
> Thanks for your reply. Actually, I need mapping for classes B and C to be
> abstract, because in the xml, I don't know what the containing element will
> be: it could be either Identifier1 or Identifier2 or to turn it around, in
> the xml, Identifier1 and Identifier2 could be unmarshalled to either an
> instance of class B or C, depending on the containing xml structure.
>
> To illustrate this, the following snippets of xml should both be
> unmarshallable, the first would unmarshal to an instance of class B, the
> second to an instance of class C.
>
> <Identifier1>
> <LdapName>1</LdapName>
> </Identifier1>
>
> <Identifier1>
> <IdentPart1>a</IdentPart1>
> <IdentPart2>b</IdentPart2>
> </Identifier1>
>
> To my understanding, this can't work, because JiBX needs to "know" which of A
> or B it's unmarshalling at the time it sees the <Identifier1> element. By the
> time it recurses and starts decoding the nested elements, it's already chosen
> which outer concrete binding it is decoding with.
>
> Your only option if the XML can't be changed is to create a single class that
> contains both of A's and B's fields. You could then add methods to that class
> that returned an actual instance of A or B as appropriate (by
> copying/mirroring the field values). This adds an ugly extra step in your
> Java code but allows this XML to work.
>
> -Archie
>
> --
> Archie L. Cobbs
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