How to use

getRules

method

in

org.threeten.bp.zone.ZoneRulesProvider

@Override
public ZoneRules getRules() {
  // additional query for group provider when null allows for possibility
  // that the provider was added after the ZoneId was created
  return (rules != null ? rules : ZoneRulesProvider.getRules(id, false));
}

@Override
public ZoneRules getRules() {
  // additional query for group provider when null allows for possibility
  // that the provider was added after the ZoneId was created
  return (rules != null ? rules : ZoneRulesProvider.getRules(id, false));
}

private SortedMap<String, ZoneRules> generateZones(String... zoneIds) throws IOException {
  SortedMap<String, ZoneRules> zones = new TreeMap<>();
  for (String zoneId : zoneIds) {
    zones.put(zoneId, ZoneRulesProvider.getRules(zoneId, false));
  }
  zoneWriter.writeZones(zones);
  return zones;
}

/**
 * Obtains an instance of {@code ZoneId} from an identifier.
 *
 * @param zoneId  the time-zone ID, not null
 * @param checkAvailable  whether to check if the zone ID is available
 * @return the zone ID, not null
 * @throws DateTimeException if the ID format is invalid
 * @throws DateTimeException if checking availability and the ID cannot be found
 */
static ZoneRegion ofId(String zoneId, boolean checkAvailable) {
  Jdk8Methods.requireNonNull(zoneId, "zoneId");
  if (zoneId.length() < 2 || PATTERN.matcher(zoneId).matches() == false) {
    throw new DateTimeException("Invalid ID for region-based ZoneId, invalid format: " + zoneId);
  }
  ZoneRules rules = null;
  try {
    // always attempt load for better behavior after deserialization
    rules = ZoneRulesProvider.getRules(zoneId, true);
  } catch (ZoneRulesException ex) {
    // special case as removed from data file
    if (zoneId.equals("GMT0")) {
      rules = ZoneOffset.UTC.getRules();
    } else if (checkAvailable) {
      throw ex;
    }
  }
  return new ZoneRegion(zoneId, rules);
}

/**
 * Obtains an instance of {@code ZoneId} from an identifier.
 *
 * @param zoneId  the time-zone ID, not null
 * @param checkAvailable  whether to check if the zone ID is available
 * @return the zone ID, not null
 * @throws DateTimeException if the ID format is invalid
 * @throws DateTimeException if checking availability and the ID cannot be found
 */
static ZoneRegion ofId(String zoneId, boolean checkAvailable) {
  Jdk8Methods.requireNonNull(zoneId, "zoneId");
  if (zoneId.length() < 2 || PATTERN.matcher(zoneId).matches() == false) {
    throw new DateTimeException("Invalid ID for region-based ZoneId, invalid format: " + zoneId);
  }
  ZoneRules rules = null;
  try {
    // always attempt load for better behavior after deserialization
    rules = ZoneRulesProvider.getRules(zoneId, true);
  } catch (ZoneRulesException ex) {
    // special case as removed from data file
    if (zoneId.equals("GMT0")) {
      rules = ZoneOffset.UTC.getRules();
    } else if (checkAvailable) {
      throw ex;
    }
  }
  return new ZoneRegion(zoneId, rules);
}

/**
 * Call on background thread to eagerly load all zones. Starts with loading
 * {@link ZoneId#systemDefault()} which is the one most likely to be used.
 */
@WorkerThread
public static void cacheZones() {
  ZoneId.systemDefault().getRules();
  for (String zoneId : ZoneRulesProvider.getAvailableZoneIds()) {
    ZoneRulesProvider.getRules(zoneId, true);
  }
}