getKeyAndValue<T> method

Future<MapEntry<String, T>?> getKeyAndValue<T>({ required String variationId, })

Gets the key of a setting and its value identified by the given variationId (analytics). variationId the Variation ID. T the type of the desired feature flag or setting. Only the following types are allowed: String, bool, int, double, Object (both nullable and non-nullable) and dynamic.

Implementation

Future<MapEntry<String, T>?> getKeyAndValue<T>(
    {required String variationId}) async {
  _validateReturnType<T>();

  try {
    final result = await _getSettings();
    if (result.isEmpty) {
      _errorReporter.error(
          1000, 'Config JSON is not present. Returning null.');
      return null;
    }

    for (final entry in result.settings.entries) {
      if (entry.value.variationId == variationId) {
        return MapEntry(
            entry.key,
            _parseSettingValue<T>(
                entry.value.settingValue, entry.value.type));
      }

      for (final targetingRule in entry.value.targetingRules) {
        if (targetingRule.servedValue != null) {
          if (targetingRule.servedValue?.variationId == variationId) {
            return MapEntry(
                entry.key,
                _parseSettingValue<T>(targetingRule.servedValue!.settingValue,
                    entry.value.type));
          }
        } else {
          var targetRulePercentageOptions = targetingRule.percentageOptions;
          if (targetRulePercentageOptions != null) {
            for (final percentageOption in targetRulePercentageOptions) {
              if (percentageOption.variationId == variationId) {
                return MapEntry(
                    entry.key,
                    _parseSettingValue<T>(
                        percentageOption.settingValue, entry.value.type));
              }
            }
          } else {
            throw UnsupportedError(
                "Targeting rule THEN part is missing or invalid.");
          }
        }
      }

      for (final percentageOption in entry.value.percentageOptions) {
        if (percentageOption.variationId == variationId) {
          return MapEntry(
              entry.key,
              _parseSettingValue<T>(
                  percentageOption.settingValue, entry.value.type));
        }
      }
    }

    _errorReporter.error(2011,
        'Could not find the setting for the specified variation ID: \'$variationId\'.');
    return null;
  } catch (e, s) {
    _errorReporter.error(
        1002,
        'Error occurred in the `getKeyAndValue` method. Returning null.',
        e,
        s);
    return null;
  }
}