CustomerSpecifications.java 文件源码

/**
 * All customers with an {@link Account} expiring before the given date.
 * 
 * @param date
 * @return
 */
public static Specification<Customer> accountExpiresBefore(final LocalDate date) {

    return new Specification<Customer>() {

        @Override
        public Predicate toPredicate(Root<Customer> root, CriteriaQuery<?> query, CriteriaBuilder cb) {

            Root<Account> accounts = query.from(Account.class);
            Path<Date> expiryDate = accounts.<Date> get("expiryDate");
            Predicate customerIsAccountOwner = cb.equal(accounts.<Customer> get("customer"), root);
            Predicate accountExpiryDateBefore = cb.lessThan(expiryDate, date.toDateTimeAtStartOfDay().toDate());

            return cb.and(customerIsAccountOwner, accountExpiryDateBefore);
        }
    };
}