public function isValid($value)
    {
        $acceptedValues = GeneralUtility::trimExplode('|', $this->options['values']);

        if (false === in_array($value, $acceptedValues)) {
            $errorMessage = $this->translateErrorMessage('validator.has_values.not_valid', 'configuration_object', [implode(', ', $acceptedValues)]);
            $this->addError($errorMessage, 1456140151);
        }
    }