/**
* Returns the object associated with the reference, defaulting it to the parent if the reference
* is unset, and the parent is of the correct archetype.
*
* @param reference the reference
* @param parent the parent object
* @param archetypeRange the archetypes that the reference may refer to
* @param cache the cache
* @return the object, or {@code null} if the reference is set but refers to an invalid object
*/
private IMObject getObject(
IMObjectReference reference, IMObject parent, String[] archetypeRange, IMObjectCache cache) {
IMObject result = null;
if (reference == null) {
if (TypeHelper.isA(parent, archetypeRange)) {
result = parent;
}
} else if (reference.equals(parent.getObjectReference())) {
result = parent;
} else {
result = cache.get(reference);
}
return result;
}
/** Clears the cache. */
public void clear() {
cache.clear();
}
/**
* Retrieves an object given its reference.
*
* @param reference the object reference
* @return the corresponding object, or {@code null} if none is found
* @throws ArchetypeServiceException if the query fails
*/
@Override
public IMObject get(IMObjectReference reference) {
return cache.get(reference);
}