validate method

Implementation

@override
void validate(String? newValue) {

  final String? _newValue = newValue;

  if (_newValue == null || _newValue.isEmpty) {
    if (isRequired) {
      throw RequiredValueException();
    }else{
      return;
    }
  }

  final DateTime? valueLocal = DateTime.tryParse(_newValue);

  if (valueLocal == null) {
    throw InvalidValueException();
  }

  final DateTime? maxValueLocal = maxValue;
  final DateTime? minValueLocal = minValue;

  if (maxValueLocal == null && minValueLocal == null) {
    return;
  }

  if (maxValueLocal != null) {
    if (valueLocal.compareTo(maxValueLocal) <= 0) {
      throw TooLongValueException();
    }
  }

  if (minValueLocal != null) {
    if (valueLocal.compareTo(minValueLocal) >= 0) {
      throw TooShortValueException();
    }
  }
}