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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