delegate property

@visibleForTesting @override Map<String, Object> delegate

Implementation

@meta.visibleForTesting
@override
Map<K, T> get delegate {
  try {
    final fileContents = file.readAsStringSync();
    final configMap =
        const convert.JsonDecoder().convert(fileContents) as Map;
    return {
      ...defaults,
      ...Map<K, T>.from(configMap),
    };
  } on io.FileSystemException catch (exception) {
    // ENOENT - file or directory does not exist.
    // We don't create until a value is set.
    if (exception.osError?.errorCode == 2 ||
        exception.osError?.errorCode == 3) {
      return {
        ...defaults,
      };
    }

    // EACCES - no permission to access the file.
    // Throw a nicer error message.
    if (exception.osError?.errorCode == 13) {
      throw Exception(
        'Access denied when attempting to read the "$id" storagebox at path "${file.path}".',
      );
    }

    rethrow;
  } on FormatException {
    // The file is empty or contains invalid JSON.
    // Next time the map is modified the file will be reset.
    return {
      ...defaults,
    };
  } catch (e) {
    rethrow;
  }
}

@visibleForTesting @override void delegate=(Map<String, Object> updatedMap)

Implementation

@meta.visibleForTesting
@override
set delegate(Map<K, T> updatedMap) {
  try {
    final updatedConfigMapString =
        const convert.JsonEncoder.withIndent('\t').convert(updatedMap);
    file.createSync(recursive: true);
    file.writeAsStringSync(
      updatedConfigMapString,
      flush: true,
    );
    return;
  } on io.FileSystemException catch (exception) {
    // EACCES - no permission to access the file.
    // Throw a helpful error message.
    if (exception.osError?.errorCode == 13) {
      throw StorageBoxException(
        'Access denied when attempting to write to the "$id" storagebox at path "${file.path}".',
      );
    }
    rethrow;
    // ignore: avoid_catching_errors
  } on convert.JsonUnsupportedObjectError catch (error) {
    final key = updatedMap.keys
        .firstWhere((key) => updatedMap[key] == error.unsupportedObject);
    throw StorageBoxException(
      'Value for key "$key" for "$id" storagebox at path "${file.path}" is not a JSON serializable value.',
    );
  } catch (e) {
    rethrow;
  }
}