Hi,
Sorry for a separate post. After posted the message, I managed to find a
way to provide flatten mapping for Equipment using serializer and
deserializer.
So now I have the binding defined as follow:
<mapping name="lineitem"
class="com.waveman.poc.EquipmentLineItem">
<value name="name"
field="equipment"
serializer="com.waveman.poc.BindingUtils.equipmentToString"
deserializer="com.waveman.poc.BindingUtils.stringToEquipment"
/>
<value name="quantity" field="quantity" />
</mapping>
However, I still could not figure out how to have different element name
based on Equipment subclasses. The current binding always map Equipment
to <name> tag under <lineItem> here is the example (which is not the
correct one).
<equipment>
<lineitem>
<name>Siemens S45</name>
<quantity>10</name>
</lineitem>
<lineitem>
<name>O2 XDA</name>
<quantity>5</quantity>
</equipment>
So now, the revised (and hopefully, final) question is, how to define
the binding to have element name different, based on subclasses of
Equipment (like the example XML file in my previous post)?
Regards,
Vairoj
Vairoj A. wrote:
Hi,
After my previous post with suggestion from Dennis, I have re-evaluate
the structure of both domain object and XML with other application
requirements. It is confirm the the domain object has to remain
unchanged. However, the XML structure can be changed.
So the same object model:
class Person {
private Set<EquipmentLineItem> lineItems;
}
class EquipmentLineItem {
private Equipment equipment;
private int quantity;
}
abstract class Equipment {
private String name;
}
class Phone extends Equipment {
private int someOtherAttrib;
}
class Pda extends Equipment {
private String someOtherAttrib;
}
Now, the XML will be look like what Dennis suggested in his reply to
my previous post:
<equipment>
<item>
<phone>Siemens S45</phone>
<quantity>5</quantity>
</item> <item>
<pda>O2 XDA</pda>
<quantity>2</quantity>
</item>
</equipment>
Point to note is that, the binding will not construct Equipment
subclass itself this time. As you can see from the class declaration,
there are some other attributes specific to each subclass. So I would
like to delegate the instantiation of Equipment subclass to a factory
method instead. The factory method returns correct instance (fully
initialized) based on String between <phone> tag or <pda> tag (i.e.
Siemens S45, O2 XDA)
public static Equipment getEquipment(String equipmentName)
Based on the above requirements, I am having 2 issues regarding binding:
1. How can I define the mapping for equipment so that different
subclass map to different element name?
2. I don't seems to make use of factory attribute correctly. While it
use the factory method to create new instance, it still override
values of the instance with one from the XML, which I do not want.
Could you give me a binding example for the situation? I am kind of
stuck now. Thank you very much, I know that the question is not a
short one.
Regards,
Vairoj
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