I have implemented a PreUpdateEventListener to deny updates to a particular property under certain conditions.
I am unsatisfied with my current approach. I would be very grateful if somebody would suggest a more elegant approach for detecting exactly which properties are dirty in a PreUpdateEventListener (or an entirely different strategy for doing this kind of thing).
Code:
public class PreUpdateEventListener extends DefaultPreUpdateEventListener {
public boolean onPreUpdate(PreUpdateEvent e) {
// for a particular SMDP_TEMPLATE_COURSE, course_number updates are not
// allowed if SMDP_RATE_CREDIT_COURSE records are present; the
// course_number is at property index 1
if(
e.getEntity() instanceof TemplateCourse
&& ((TemplateCourse)e.getEntity()).getRateCreditCourses().size() > 0
&& !e.getPersister().getDatabaseSnapshot(e.getId(), e.getSession())[1]
.equals(((TemplateCourse)e.getEntity()).getCourseNumber())
) {
throw new RateCreditMaintenanceNotAllowedException();
}
return super.onPreUpdate(e);
}
}
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