private PropertySourceLoader getPropertySourceLoader(String fileName) throws UnSupportConfigFileSuffixException {
    if (fileName.contains(PROPERTIES_FILE_EXTENSION)) {
        return new PropertiesPropertySourceLoader();
    } else if (fileName.contains(YAML_FILE_EXTENSION)) {
        return new YamlPropertySourceLoader();
    }
    LOGGER.error("Failed to recognize file: {}", fileName);
    throw new UnSupportConfigFileSuffixException();
}