How to get dbEntityName from a transient object?

[Borut Bolčina]

Hello,

is there a better solution to creating a dummyDataContext just to get
dbEntityName and then unregistering all objects:

            DataContext context = DataContext.createDataContext();
            // item is TRANSIENT
            CayenneDataObject item = (CayenneDataObject)
allItemsFromOneProvider.iterator().next();
            // so create a dummy data context
            DataContext dummyContext = DataContext.createDataContext();
            dummyContext.registerNewObject(item);
            // just to find out table name
            logger.debug("item.getObjEntity().getDbEntityName(): " +
item.getObjEntity().getDbEntityName());
            String tableName = item.getObjEntity().getDbEntityName();
            // now unregister item
            dummyContext.unregisterObjects(allItemsFromOneProvider);

            context.performGenericQuery(new NamedQuery("DeleteAll",
Collections.singletonMap("table", tableName)));

            // now do a clean insert
            logger.info("Persisting...");
            for (Iterator i = allItemsFromOneProvider.iterator();
i.hasNext();) {
                item = (CayenneDataObject) i.next();

                context.registerNewObject(item);
            }
            context.commitChanges();

Regards,
Borut