MCRHibernateConfigHelper.java 文件源码

private static String getUniqueColumns(Class<?> clazz, String name) {
    return Optional.of(clazz)
        .map(c -> c.getAnnotation(Table.class))
        .map(Table::uniqueConstraints)
        .map(Stream::of)
        .flatMap(s -> s
            .filter(uc -> uc.name().equals(name))
            .findAny()
            .map(UniqueConstraint::columnNames))
        .map(Stream::of)
        .map(s -> s.collect(Collectors.joining(", ")))
        .get();
}