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From Dirk Lattermann <dl...@alqualonde.de>
Subject Getting property type information for JBND
Date Mon, 19 May 2008 20:51:29 GMT
The following may boil down to "How can I get entity/property
information on a Fault object?", but I'm not sure. Let me explain:

To use Cayenne in a Swing application, I found JBND yesterday after
browsing this list. It didn't seem too complicated to implement the
needed org.jbnd.DataObject interface for the CayenneDataObjects, so I
gave it a naïve try.

I used a custom superclass for the objects generated by the Cayenne
modeler. Most things were rather straightforward and work to a small
amount. Then I stumbled over a problem which seems to be connected to
Faults.

A JBND DataObject must be able to return a JBND DataType which
describes, among others, its properties. To determine the type of a
property (attribute, to-one or to-many), I use

-----------
 objEntity = JBNDCayenneObject.this.getObjEntity();
 if (objEntity.getAttribute(key) != null) return DataType.ATTRIBUTE_KEY;
 if (objEntity.getRelationship(key) != null)
 {
    if (objEntity.getRelationship(key).isToMany()) return
DataType.TO_MANY_KEY;
    else return TO_ONE_KEY;
 }
-----------

now, in a to-many-relationship, the JBND framework asks for the type of
a property of a descendant object. A
   System.out.println(JBNDCayenneObject.this)
reveals
   {<no id>; transient; []}

This indicates a yet unfetched object (Fault), right?
Apparently, even though JBNDCayenneObject.this.getClass() is the
correct class of my data object, the getObjEntity() returns null.

How can I obtain the property information in this case?
Maybe it should be done via the DataMap and object entity name, but how
do I find and access the DataMap?
Even JBNDCayenneObject.this.getObjectId() returns null!

Thank you!
Dirk


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