// Throws exception if not working correctly
    HostSpecifier unused = HostSpecifier.fromValid(spec);
    unused = HostSpecifier.from(spec);
    assertTrue(HostSpecifier.isValid(spec));
  }

  private void assertBad(String spec) {
    try {
      HostSpecifier.fromValid(spec);
      fail("Should have thrown IllegalArgumentException: " + spec);

        Iterables.concat(INVALID_NAME, VALID_IP_ADDRS, INVALID_IP_ADDRS);

    for (String valid : validCases) {
      assertTrue(valid, InternetDomainName.isValid(valid));
    }

    for (String invalid : invalidCases) {
      assertFalse(invalid, InternetDomainName.isValid(invalid));
    }
  }

  public void testToString() {
    for (String inputName : SOMEWHERE_UNDER_PS) {

    }
  }

  /**
   * Determines whether {@code specifier} represents a valid {@link HostSpecifier} as described in
   * the documentation for {@link #fromValid(String)}.
   */
  public static boolean isValid(String specifier) {
    try {
      HostSpecifier unused = fromValid(specifier);
      return true;
    } catch (IllegalArgumentException e) {
      return false;
    }
  }

  @Override

    // Throws exception if not working correctly
    HostSpecifier unused = HostSpecifier.fromValid(spec);
    unused = HostSpecifier.from(spec);
    assertTrue(HostSpecifier.isValid(spec));
  }

  private void assertBad(String spec) {
    try {
      HostSpecifier.fromValid(spec);
      fail("Should have thrown IllegalArgumentException: " + spec);

public class CronExpressionValidator implements ConstraintValidator<CronExpression, String> {

    @Override
    public void initialize(final CronExpression constraintAnnotation) {
    }

    @Override
    public boolean isValid(final String value, final ConstraintValidatorContext context) {
        return determineValid(value);
    }

    protected boolean determineValid(final String value) {

     *
     * @throws IOException
     *             if a network error occurs
     */

    @Override
    public void close () throws IOException {
        try {
            if ( this.handle.isValid() ) {
                this.handle.close();
            }
        }
        finally {
            this.file.clearAttributeCache();
            this.tmp = null;
        }
    }


    /**

        case FILE -> ComponentUtil.getFessConfig().getCrawlerFileProtocolsAsArray();
        default -> throw new ConstraintDefinitionException("protocolType is emtpy.");
        };
    }

    @Override
    public boolean isValid(final String value, final ConstraintValidatorContext context) {
        if (StringUtil.isNotBlank(value)) {
            return check(protocols, value);
        }
        return true;
    }

            max = Integer.parseInt(fessConfig.get(maxKey));
        }
        message = constraintAnnotation.message();
        validateParameters();
    }

    @Override
    public boolean isValid(final CharSequence value, final ConstraintValidatorContext context) {
        if (value == null) {
            return true;
        }

        Iterables.concat(INVALID_NAME, VALID_IP_ADDRS, INVALID_IP_ADDRS);

    for (String valid : validCases) {
      assertTrue(valid, InternetDomainName.isValid(valid));
    }

    for (String invalid : invalidCases) {
      assertFalse(invalid, InternetDomainName.isValid(invalid));
    }
  }

  public void testToString() {
    for (String inputName : SOMEWHERE_UNDER_PS) {

                .filter(s -> !requiredValidator.isValid(source.get(s), null)).collect(Collectors.toList()));
    }

    default boolean isNonEmptyValue(final Object value) {
        final RequiredValidator requiredValidator = new RequiredValidator();
        return requiredValidator.isValid(value, null);
    }

    String getCrawlerDocumentSpaceChars();