Java Code Examples for org.apache.kafka.common.config.AbstractConfig#getList()

/**
 * Method is used to return enums from a list.
 *
 * @param enumClass
 * @param config
 * @param key
 * @param <T>
 * @return
 * @see com.github.jcustenborder.kafka.connect.utils.config.validators.Validators#validEnum(Class, Enum[])
 */
public static <T extends Enum<T>> List<T> getEnums(Class<T> enumClass, AbstractConfig config, String key) {
  Preconditions.checkNotNull(enumClass, "enumClass cannot be null");
  Preconditions.checkState(enumClass.isEnum(), "enumClass must be an enum.");
  Preconditions.checkState(
      ConfigDef.Type.LIST == config.typeOf(key),
      "'%s' must be a list",
      key
  );
  List<T> result = new ArrayList<>();
  List<String> values = config.getList(key);
  for (String value : values) {
    result.add(Enum.valueOf(enumClass, value));
  }
  return result;
}
 

/**
 * Method is used to return a charset(s) for a list key.
 *
 * @param config Config to read from.
 * @param key    Key to read from
 * @return
 */
public static List<Charset> charsets(AbstractConfig config, String key) {
  final List<String> charsetNames = config.getList(key);
  final List<Charset> result = new ArrayList<>(charsetNames.size());

  for (String charsetName : charsetNames) {
    try {
      Charset charset = Charset.forName(charsetName);
      result.add(charset);
    } catch (final UnsupportedCharsetException ex) {
      ConfigException exception = new ConfigException(key, charsetName, "Invalid charset.");
      exception.initCause(ex);
      throw exception;
    }

  }
  return result;
}
 

/**
 * Method is used to return a list of InetSocketAddress from a config list of hostname:port strings.
 *
 * @param config config to read the value from
 * @param key    key for the value
 * @return List of InetSocketAddress for the supplied strings.
 */
public static List<InetSocketAddress> inetSocketAddresses(AbstractConfig config, String key) {
  Preconditions.checkNotNull(config, "config cannot be null");
  List<String> value = config.getList(key);
  List<InetSocketAddress> addresses = new ArrayList<>(value.size());
  for (String s : value) {
    addresses.add(parseInetSocketAddress(s));
  }
  return ImmutableList.copyOf(addresses);
}
 

/**
 * Method is used to parse a list ConfigDef item to a list of HostAndPort
 *
 * @param config      Config to read from
 * @param key         ConfigItem to get the host string from.
 * @param defaultPort The default port to use if a port was not specified. Can be null.
 * @return
 */
public static List<HostAndPort> hostAndPorts(AbstractConfig config, String key, Integer defaultPort) {
  final List<String> inputs = config.getList(key);
  List<HostAndPort> result = new ArrayList<>();
  for (final String input : inputs) {
    final HostAndPort hostAndPort = hostAndPort(input, defaultPort);
    result.add(hostAndPort);
  }

  return ImmutableList.copyOf(result);
}
 

/**
 * Method is used to retrieve a list of URL(s) from a configuration key.
 *
 * @param config Config to read
 * @param key    Key to read
 * @return URL for the value.
 */
public static List<URL> urls(AbstractConfig config, String key) {
  List<URL> result = new ArrayList<>();
  List<String> input = config.getList(key);
  for (String s : input) {
    result.add(url(key, s));
  }
  return ImmutableList.copyOf(result);
}
 

/**
 * Method is used to retrieve a list of URI(s) from a configuration key.
 *
 * @param config Config to read
 * @param key    Key to read
 * @return URI for the value.
 */
public static List<URI> uris(AbstractConfig config, String key) {
  List<URI> result = new ArrayList<>();
  List<String> input = config.getList(key);
  for (String s : input) {
    result.add(uri(key, s));
  }
  return ImmutableList.copyOf(result);
}
 

/**
 * Method is used to retrieve a list and convert it to an immutable set.
 *
 * @param config Config to read
 * @param key    Key to read
 * @return ImmutableSet with the contents of the config key.
 * @see com.google.common.collect.ImmutableSet
 */
public static Set<String> getSet(AbstractConfig config, String key) {
  List<String> value = config.getList(key);
  return ImmutableSet.copyOf(value);
}