return Optional.of(commandLine.getOptionValue(CLIManager.MODEL_VERSION));
        }
        return Optional.empty();
    }

    @Override
    @Nonnull
    public Optional<String> directory() {
        if (commandLine.hasOption(CLIManager.DIRECTORY)) {
            return Optional.of(commandLine.getOptionValue(CLIManager.DIRECTORY));
        }
        return Optional.empty();
    }