return returnFirstPresentOrEmpty(Options::altInstallationSettings);
    }

    @Override
    public Optional<String> altUserToolchains() {
        return returnFirstPresentOrEmpty(Options::altUserToolchains);
    }

    @Override
    public Optional<String> altInstallationToolchains() {
        return returnFirstPresentOrEmpty(Options::altInstallationToolchains);
    }

            cmdAndArguments.add(mavenOptions.altInstallationSettings().get());
        }
        if (mavenOptions.altUserToolchains().isPresent()) {
            cmdAndArguments.add("--toolchains");
            cmdAndArguments.add(mavenOptions.altUserToolchains().get());
        }
        if (mavenOptions.altInstallationToolchains().isPresent()) {
            cmdAndArguments.add("--install-toolchains");

    protected void toolchains(C context) throws Exception {
        Path userToolchainsFile = null;

        if (context.invokerRequest.options().altUserToolchains().isPresent()) {
            userToolchainsFile = context.cwdResolver.apply(
                    context.invokerRequest.options().altUserToolchains().get());

            if (!Files.isRegularFile(userToolchainsFile)) {
                throw new FileNotFoundException(

    /**
     * Returns the path to an alternate user toolchains file.
     *
     * @return an {@link Optional} containing the file path, or empty if not set
     */
    @Nonnull
    Optional<String> altUserToolchains();

    /**
     * Returns the path to an alternate installation toolchains file.
     *
     * @return an {@link Optional} containing the file path, or empty if not set
     */
    @Nonnull

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

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