如何在JPA查询中有条件地忽略WHERE部分SQL查询

import javax.persistence.EntityManager;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Predicate;
import javax.persistence.criteria.Root;

public class UserRepository {

    private EntityManager entityManager;

    public List<User> findUsersByCondition(String name, Integer age) {
        CriteriaBuilder criteriaBuilder = entityManager.getCriteriaBuilder();
        CriteriaQuery<User> query = criteriaBuilder.createQuery(User.class);
        Root<User> root = query.from(User.class);

        List<Predicate> predicates = new ArrayList<>();

        if (name != null) {
            predicates.add(criteriaBuilder.equal(root.get("name"), name));
        }

        if (age != null) {
            predicates.add(criteriaBuilder.equal(root.get("age"), age));
        }

        query.where(predicates.toArray(new Predicate[0]));

        return entityManager.createQuery(query).getResultList();
    }
}