MailResolverService.java 文件源码

/**
 * Decodes a list of MX records into a tree map, ranking them automatically.
 *
 * @param records The list of MX records.
 * @return The tree map containing ranked MX records.
 */
private TreeMultimap<Integer, String> decodeRecords(List<Record> records) {
    TreeMultimap<Integer, String> recordMap = TreeMultimap.create(Ordering.natural(), Ordering.natural());

    records.forEach(record -> {
        String[] split = record.rdataToString().split(" ");

        if (split.length >= 2) {

            try {
                int rank = Integer.parseInt(split[0]);
                String domain = split[1];

                recordMap.put(rank, domain);

            } catch (NumberFormatException ex) {
                ex.printStackTrace();
            }

        }
    });

    return recordMap;
}