I was thinking of a concrete Party object with a reference to the base
class for the Person and Business object.
abstract class PartyReference{
}
class Party{
PartyReference reference;
}
class Person extends PartyReference{}
class Business extends PartyReference{}
The mappings
<mapping class="PartyReference" abstract="true">
</mapping>
<mapping class="Person" extends="PartyReference">
<structure map-as="PartyReference"/>
</mapping>
<mapping class="Party">
<structure field="reference"/>
</mapping>
This way the bindings are simpler. What do you think?
regards
Varghese
[EMAIL PROTECTED] wrote:
Thank you for the quick response. In the examples that I have found
when using abstract mappings, you know ahead of time that there are
different types of data to be mapped to one abstract class. In my
case, if I choose the abstract mapping approach, I will still need to
split the abstract Party object out into either a Person or a Business
element once I marshal back into xml for my application. I need to do
this because my input xml is defined in a structure that does not
conform to the backend application's schema. So on input, I have
either a Person or Business which gets mapped to one abstract Party
class, but the Party class will need to be mapped to either a Person
or Business when I marshal the xml into a form understood by my
receiving application.
Is there a way to do this?
Thanks!
Barry
*Varghese C V <[EMAIL PROTECTED]>*
/Sent by:// //[EMAIL PROTECTED]/
*06/25/2007 03:19 AM*
Please respond to JiBX users <jibx-users@lists.sourceforge.net>
From
*Varghese C V <[EMAIL PROTECTED]>*
To
JiBX users <jibx-users@lists.sourceforge.net>
cc
Subject
Re: [jibx-users] JiBX dynamic binding question
Since the Party object can contain a Person or a Business object,
wouldn't it be better modeled if you have a abstract base class for
these objects?
Then Party object would contain a reference to this base type. In Jibx,
you would then have a abstract mapping for the base type, mappings for
each inherited type and a mapping for the Party type. This approach
assumes that you have the liberty to define the input xml and that you
can change your model classes.
Varghese
[EMAIL PROTECTED] wrote:
>
> Hello All,
>
> I have a question about unmarshalling to specific objects based off an
> attribute value in the input xml. At any given time, my input xml
> tag will remain the same. However, the *xsi:type* attribute could be
> different. I need to map/bind to a specific object based off the
> value in the attribute. I have not found anywhere in the
> documentation where I can bind to a specific object dynamically, but I
> have been trying to get this to work using method hooks.
> .
> For example, my input xml will contain one of the following entries....
>
> <ns:Party xsi:type='person'>
> <ns:Id>1111111111111111111</ns:Id>
> <ns:CommonType>P</ns:CommonType>
> <ns:BirthDate>P</ns:BirthDate>
> </ns:Party>
>
> or
>
> <ns:Party xsi:type='business'>
> <ns:Id>22222222222222222</ns:Id>
> <ns:CommonType>O</ns:CommonType>
> <ns:BusinessType>1</ns:BusinessType>
> </ns:Party>
>
>
> My binding definition contains the following....
>
> <mapping name="Party " class="commonparty.Party" post-set="postset"
> ordered="false">
> <namespace prefix="obj" uri="http://input.common.com";
> default="elements"/>
> <namespace prefix="xsi"
> uri="http://www.w3.org/2001/XMLSchema-instance"; default="attributes"/>
> <value name="type" field ="type" style="attribute"
> usage="optional" />
> <value name="Id" field="partyId" usage="optional"/>
> <value name="CommonType" field="commonType" usage="optional"/>
> </mapping>
>
>
> My java class structure declares that a Party object is composed of a
> Person and Business object. However, at any give time the Party
> object would contain a reference to either Person or Business.
>
> public class Party {
> public String type;
> public Person person;
> public Business business;
>
> public void postset(IUnmarshallingContext ctx) {
> if ( type.equals("Person") ) {
> //Copy fields from Party to new instance of
> Person
> //Replace Party object on the stack with Person
>
> } else {
> //Copy fields from Party to new instance of
> Business
> //Replace Party object on the stack with of
> }
> }
> .
> .
> .
> }
>
> public class Person {
> public String birthDate;
> .
> .
> .
> }
>
> public class Business{
> public String businessType;
> .
> .
> .
> }
>
>
> As you can see, I am always mapping the "Party" tag to a Party object.
> The party object contains a post-set method that accepts the
> IUnmarshallingContext signature. In the postset method, I am
> evaluating the xsi:type. If the type is "Person", then I want to pop
> the current Party object from the stack and push a new instance of a
> Person object for JiBX to unmarshall. After coming to this idea, I
> realized that I do not have a specific mapping for a Person object. I
> definitly need a Person and a Business object because they contain
> different fields ( as listed in my input example above ).
>
> Does anyone know if there is a binding syntax that will allow me to
> handle this work in the binding.xml? If not, is there another
> solution without modifying JiBX?
>
> Thanks for the help!
>
> Barry
>
> ------------------------------------------------------------------------
>
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