/// <summary>
/// initializes <see cref="SettingsContainer"/> with data from existing
/// corresponding data file.
/// </summary>
/// <exception cref="FileReadException">
/// thrown if reading from <see cref="SettingsContainer"/> data file failed
/// </exception>
/// <exception cref="JsonSerializationException">
/// thrown if <see cref="SettingsContainer"/> data file content is not in a valid
/// JSON format.
/// </exception>
/// <exception cref="SettingsContainerJsonObjectParseException">
/// thrown if parsing <see cref="SettingsContainer"/> from <see cref="SettingsContainer"/>
/// data file content failed
/// </exception>
private void initializeSettingsContainerFromExistingDataFile()
{
// initialize settings container with values from settings file
string settingsContainerJsonString = FileIOUtils.ReadTextFromFile(SETTINGS_FILE_PATH);
object settingsContainerJsonObject = JsonUtils.DeserializeObject <object>(
settingsContainerJsonString);
this.settingsContainer = SettingsContainer.Parse(settingsContainerJsonObject);
}