/**
     * Helper method to collect configuration for this class
     * @param \TYPO3\FLOW3\Property\PropertyMappingConfigurationInterface $configuration
     * @param array $configurationKeys
     * @return array
     */
    protected function getConfigurationKeysAndValues(\TYPO3\FLOW3\Property\PropertyMappingConfigurationInterface $configuration, array $configurationKeys) {
        $keysAndValues = array();
        foreach ($configurationKeys as $configurationKey) {
            $keysAndValues[$configurationKey] = $configuration->getConfigurationValue('TYPO3\FLOW3\Property\TypeConverter\FloatConverter', $configurationKey);
        }
        return $keysAndValues;
    }