validateValue method

  1. @override
String? validateValue(
  1. String valueCandidate
)
override

Validates the value. Returns null if the value is valid, otherwise an error message. Call validate() instead of this method when using the validator.

Implementation

@override
String? validateValue(String valueCandidate) {
  if (passportNumberBlacklist.contains(valueCandidate)) {
    return errorText;
  }

  if (!regex.hasMatch(valueCandidate)) {
    return errorText;
  }

  if (passportNumberWhitelist.isEmpty ||
      passportNumberWhitelist.contains(valueCandidate)) {
    return null;
  }

  return errorText;
}