/** Construct a join predicate on collection (eg many to many, List) */
public <T> List<Predicate> byExampleOnManyToMany(
ManagedType<T> mt,
Root<T> mtPath,
final T mtValue,
SearchParameters sp,
CriteriaBuilder builder) {
List<Predicate> predicates = newArrayList();
for (PluralAttribute<T, ?, ?> pa : mt.getDeclaredPluralAttributes()) {
if (pa.getCollectionType() == PluralAttribute.CollectionType.LIST) {
List<?> values = (List<?>) JpaUtil.getValue(mtValue, mt.getAttribute(pa.getName()));
if (values != null && !values.isEmpty()) {
if (sp.getUseANDInManyToMany()) {
if (values.size() > 3) {
log.warn(
"Please note that using AND restriction on an Many to Many relationship requires as many joins as values");
}
for (Object value : values) {
ListJoin<T, ?> join = mtPath.join(mt.getDeclaredList(pa.getName()));
predicates.add(join.in(value));
}
} else {
ListJoin<T, ?> join = mtPath.join(mt.getDeclaredList(pa.getName()));
predicates.add(join.in(values));
}
}
}
}
return predicates;
}
