public function reverseTransform($string)
    {
        if (null !== $string && !is_string($string)) {
            throw new TransformationFailedException('Expected a string.');
        }

        $string = trim($string);
        if (empty($string)) {
            return array();
        }

        $values = explode($this->delimiter, $string);

        if (0 === count($values)) {
            return array();
        }

        foreach ($values as &$value) {
            $value = trim($value);
        }

        return $values;
    }