public function getExtensionConfiguration($configurationName)
    {
        $result = null;
        $extensionConfiguration = $this->getFullExtensionConfiguration();

        if (null === $configurationName) {
            $result = $extensionConfiguration;
        } elseif (ArrayUtility::isValidPath($extensionConfiguration, $configurationName, '.')) {
            $result = ArrayUtility::getValueByPath($extensionConfiguration, $configurationName, '.');
        }

        return $result;
    }