/** Add a predicate for each simple property whose value is not null. */
public <T> List<Predicate> byExample(
ManagedType<T> mt,
Path<T> mtPath,
final T mtValue,
SearchParameters sp,
CriteriaBuilder builder) {
List<Predicate> predicates = newArrayList();
for (SingularAttribute<? super T, ?> attr : mt.getSingularAttributes()) {
if (attr.getPersistentAttributeType() == MANY_TO_ONE //
|| attr.getPersistentAttributeType() == ONE_TO_ONE //
|| attr.getPersistentAttributeType() == EMBEDDED) {
continue;
}
Object attrValue = JpaUtil.getValue(mtValue, attr);
if (attrValue != null) {
if (attr.getJavaType() == String.class) {
if (isNotEmpty((String) attrValue)) {
predicates.add(
JpaUtil.stringPredicate(
mtPath.get(JpaUtil.stringAttribute(mt, attr)), attrValue, sp, builder));
}
} else {
predicates.add(builder.equal(mtPath.get(JpaUtil.attribute(mt, attr)), attrValue));
}
}
}
return predicates;
}
/**
* Invoke byExample method for each not null x-to-one association when their pk is not set. This
* allows you to search entities based on an associated entity's properties value.
*/
@SuppressWarnings("unchecked")
public <T extends Identifiable<?>, M2O extends Identifiable<?>> List<Predicate> byExampleOnXToOne(
ManagedType<T> mt,
Root<T> mtPath,
final T mtValue,
SearchParameters sp,
CriteriaBuilder builder) {
List<Predicate> predicates = newArrayList();
for (SingularAttribute<? super T, ?> attr : mt.getSingularAttributes()) {
if (attr.getPersistentAttributeType() == MANY_TO_ONE
|| attr.getPersistentAttributeType() == ONE_TO_ONE) {
M2O m2oValue = (M2O) JpaUtil.getValue(mtValue, mt.getAttribute(attr.getName()));
Class<M2O> m2oType = (Class<M2O>) attr.getBindableJavaType();
Path<M2O> m2oPath = (Path<M2O>) mtPath.get(attr);
ManagedType<M2O> m2oMt = em.getMetamodel().entity(m2oType);
if (m2oValue != null) {
if (m2oValue.isIdSet()) { // we have an id, let's restrict only on this field
predicates.add(builder.equal(m2oPath.get("id"), m2oValue.getId()));
} else {
predicates.addAll(byExample(m2oMt, m2oPath, m2oValue, sp, builder));
}
}
}
}
return predicates;
}