/**
* Check if relation type is registered predicate.
*
* @param predicate the predicate as URI
* @throws InvalidContentException Thrown if predicate is invalid
* @throws WebserverSystemException Thrown if internal error occur
* @throws RelationPredicateNotFoundException Thrown if the predicate is not registered.
*/
private static void checkRelationType(final URI predicate)
throws RelationPredicateNotFoundException {
if (!ContentRelationsUtility.validPredicate(predicate)) {
throw new RelationPredicateNotFoundException(
"Predicate " + predicate + " is not on the registered predicate list. ");
}
}
