/**
* If the existing proxy is insufficiently "narrow" (derived), instantiate a new proxy and
* overwrite the registration of the old one. This breaks == and occurs only for "class" proxies
* rather than "interface" proxies. Also init the proxy to point to the given target
* implementation if necessary.
*
* @param proxy The proxy instance to be narrowed.
* @param persister The persister for the proxied entity.
* @param key The internal cache key for the proxied entity.
* @param object (optional) the actual proxied entity instance.
* @return An appropriately narrowed instance.
* @throws HibernateException
*/
public Object narrowProxy(Object proxy, EntityPersister persister, EntityKey key, Object object)
throws HibernateException {
boolean alreadyNarrow =
persister.getConcreteProxyClass(session.getEntityMode()).isAssignableFrom(proxy.getClass());
if (!alreadyNarrow) {
if (PROXY_WARN_LOG.isWarnEnabled()) {
PROXY_WARN_LOG.warn(
"Narrowing proxy to "
+ persister.getConcreteProxyClass(session.getEntityMode())
+ " - this operation breaks ==");
}
if (object != null) {
proxiesByKey.remove(key);
return object; // return the proxied object
} else {
proxy = persister.createProxy(key.getIdentifier(), session);
proxiesByKey.put(key, proxy); // overwrite old proxy
return proxy;
}
} else {
if (object != null) {
LazyInitializer li = ((HibernateProxy) proxy).getHibernateLazyInitializer();
li.setImplementation(object);
}
return proxy;
}
}
@Override
public void setImplementation(Object target) {
LazyInitializer rawLazyInitializer = this.lazyInitializer;
Object oldTarget =
rawLazyInitializer.isUninitialized() ? null : rawLazyInitializer.getImplementation();
if (target != oldTarget) {
ScalarListener listener = this.new TargetScalarListener();
if (oldTarget != null) {
this.omFactory.get(oldTarget).removeScalarListener(listener);
}
rawLazyInitializer.setImplementation(target);
this.oldTarget = target;
if (target != null) {
ObjectModel targetOM = this.omFactory.get(target);
targetOM.removeScalarListener(listener); // remove the duplicated listener.
targetOM.addScalarListener(listener);
}
}
}