TargetSpecifications.java 文件源码

/**
 * {@link Specification} for retrieving {@link Target}s by tag.
 *
 * @param tagId
 *            the ID of the distribution set which must be assigned
 * @return the {@link Target} {@link Specification}
 */
public static Specification<JpaTarget> hasTag(final Long tagId) {

    return (targetRoot, query, cb) -> {
        final SetJoin<JpaTarget, JpaTargetTag> tags = targetRoot.join(JpaTarget_.tags, JoinType.LEFT);
        return cb.equal(tags.get(JpaTargetTag_.id), tagId);
    };
}