How to use

requireNonEmpty

method

in

com.hortonworks.streamline.common.util.Utils

public TopologyState getTopologyState(String stateName) {
  Utils.requireNonEmpty(stateName, "State name cannot be empty");
  TopologyState state = states.get(stateName);
  if (state == null) {
    throw new IllegalArgumentException("No such state " + stateName);
  }
  return state;
}

/**
 * Generates the next name for the given name and suffix.
 * <p>
 * E.g. {@code getNextName("test-foo", "-foo") returns "test-foo2",
 *      getNextName("test-foo2", "-foo") returns "test-foo3"}
 * </p>
 * @param name the current name
 * @param suffix the suffix without the number part
 * @return the next name
 */
public static String getNextName(String name, String suffix) {
  Utils.requireNonEmpty(name, "Empty name");
  String prefix;
  String suffixWithNum;
  int num = getNumPart(name, suffix);
  if (num == -1) {
    prefix = name;
    suffixWithNum = suffix;
  } else {
    prefix = getPrefix(name, suffix);
    suffixWithNum = suffix + (num + 1);
  }
  return prefix + suffixWithNum;
}

private void validateRole(Role role) {
  Utils.requireNonEmpty(role.getName(), "Role name");
  if (StringUtils.isNumeric(role.getName())) {
    throw new IllegalArgumentException("Role name cannot be numeric");
  }
  StorageUtils.ensureUnique(role, this::listRoles, QueryParam.params(User.NAME, role.getName()));
}

private void validateUser(User user) {
  Utils.requireNonEmpty(user.getName(), "User name");
  StorageUtils.ensureUnique(user, this::listUsers, QueryParam.params(User.NAME, user.getName()));
}