/**
* Searches the class descriptor for the ojbConcrete class attribute if it finds the concrete
* class attribute, append a where clause which specifies we can load all classes that are this
* type or extents of this type.
*
* @param cld
* @param crit
* @return the passed in Criteria object + optionally and'ed criteria with OR'd class type
* discriminators.
*/
private static Criteria addCriteriaForOjbConcreteClasses(ClassDescriptor cld, Criteria crit) {
/** 1. check if this class has a ojbConcreteClass attribute */
Criteria concreteClassDiscriminator = null;
Collection classes = getExtentClasses(cld);
/** 1. create a new Criteria for objConcreteClass */
if (!classes.isEmpty()) {
concreteClassDiscriminator = new Criteria();
if (classes.size() > 1) {
concreteClassDiscriminator = new Criteria();
concreteClassDiscriminator.addIn(ClassDescriptor.OJB_CONCRETE_CLASS, classes);
} else {
concreteClassDiscriminator.addEqualTo(
ClassDescriptor.OJB_CONCRETE_CLASS, classes.toArray()[0]);
}
}
/**
* 2. only add the AND (objConcreteClass = "some.class" OR....) if we've actually found concrete
* classes.
*/
if (concreteClassDiscriminator != null) {
/**
* it's possible there is no criteria attached to the query, and in this case we still have to
* add the IN/EqualTo criteria for the concrete class type so check if the crit is null and
* then create a blank one if needed.
*/
if (crit == null) {
crit = new Criteria();
}
crit.addAndCriteria(concreteClassDiscriminator);
}
/** will just return the passed in criteria if no OJB concrete class is attribute is found. */
return crit;
}
