public AppConfigurationMapperAttributes Map(string mappedConfigKey)
        {
            if (string.IsNullOrEmpty(mappedConfigKey)) return null;
            if (configMap.ContainsKey(mappedConfigKey)) return configMap[mappedConfigKey];

            var configValue = new AppConfigurationMapperAttributes(mappedConfigKey);
            configMap.Add(mappedConfigKey, configValue);

            return configValue;
        }