/**
* Returns true if the constraint is associated with the given FromElement.
*
* @param constraint the constraint in question
* @param fromElement the FromElement to check
* @return true if associated
*/
public static boolean isRelatedTo(Constraint constraint, FromElement fromElement) {
if (isAssociatedWith(constraint, fromElement)) {
return true;
}
// also want to find out if this is referred to in a Contains or Subquery
// constraint that is associated with another fromElement.
if (constraint instanceof ContainsConstraint) {
if (fromElement == ((ContainsConstraint) constraint).getQueryClass()) {
return true;
}
} else if (constraint instanceof SubqueryConstraint) {
if (fromElement == ((SubqueryConstraint) constraint).getQuery()) {
return true;
}
} else if (constraint instanceof SimpleConstraint) {
SimpleConstraint sc = (SimpleConstraint) constraint;
Set<QueryField> qFields = getQueryFields(sc.getArg1());
qFields.addAll(getQueryFields(sc.getArg2()));
for (QueryField qf : qFields) {
if (fromElement == qf.getFromElement()) {
return true;
}
}
}
return false;
}
/**
* Returns true if the given constraint is related to no FromElement. This should only return true
* if c is a SimpleConstraint that only references constants.
*
* @param c the constraint to examine
* @return true if constraint is not associated with a FromElement
*/
public static boolean isRelatedToNothing(Constraint c) {
if (c instanceof SimpleConstraint) {
SimpleConstraint sc = (SimpleConstraint) c;
Set<QueryField> fields = getQueryFields(sc.getArg1());
fields.addAll(getQueryFields(sc.getArg2()));
if (fields.size() == 0) {
return true;
}
}
return false;
}
