protected function readNonceValue($nonce)
    {
        $value = null;

        if (null === $this->registryRepository) {
            if (true === is_readable($this->nonceDir.DIRECTORY_SEPARATOR.$nonce)) {
                $value = file_get_contents($this->nonceDir.DIRECTORY_SEPARATOR.$nonce);
            }
        } else {
            $value = $this->getRegistry($nonce)->getValue();
        }

        if (null !== $value) {
            $value = explode(';', $value);
        }

        return $value;
    }