Optional<RelativeProject> resolvedParent = resolveRelativePath(
                        pomFile, context, Paths.get(path), parent.getGroupId(), parent.getArtifactId());
                resolvedParent.ifPresent(relativeProject -> parent.setVersion(relativeProject.getVersion()));
            }
        }
    }

    //
    // CI friendly versions
    //

 * relevant methods below.
 *
 * <ul>
 *   <li>This class is serializable; {@code java.util.Optional} is not.
 *   <li>{@code java.util.Optional} has the additional methods {@code ifPresent}, {@code filter},
 *       {@code flatMap}, and {@code orElseThrow}.
 *   <li>{@code java.util} offers the primitive-specialized versions {@code OptionalInt}, {@code

            cmdAndArguments.add("--install-toolchains");
            cmdAndArguments.add(mavenOptions.altInstallationToolchains().get());
        }
        if (mavenOptions.logFile().isPresent()) {
            cmdAndArguments.add("--log-file");
            cmdAndArguments.add(mavenOptions.logFile().get());
        }
        if (mavenOptions.color().isPresent()) {
            cmdAndArguments.add("--color");

        MavenOptions mavenOptions = context.invokerRequest.options();
        if (mavenOptions.failFast().isPresent()) {
            return MavenExecutionRequest.REACTOR_FAIL_FAST;
        } else if (mavenOptions.failAtEnd().isPresent()) {
            return MavenExecutionRequest.REACTOR_FAIL_AT_END;
        } else if (mavenOptions.failNever().isPresent()) {
            return MavenExecutionRequest.REACTOR_FAIL_NEVER;
        } else {

    }

    protected <T> Optional<T> returnFirstPresentOrEmpty(Function<O, Optional<T>> getter) {
        for (O option : options) {
            Optional<T> o = getter.apply(option);
            if (o.isPresent()) {
                return o;
            }
        }
        return Optional.empty();
    }

    protected Optional<List<String>> collectListIfPresentOrEmpty(Function<O, Optional<List<String>>> getter) {

        for (String selector : projectSelectors) {
            Optional<MavenProject> optSelectedProject =
                    findOptionalProjectBySelector(projects, baseDirectory, selector);
            if (!optSelectedProject.isPresent()) {
                String message = "Could not find the selected project in the reactor: " + selector;
                throw new MavenExecutionException(message, request.getPom());
            }

        if (invokerRequest.options().help().isPresent()) {
            Consumer<String> writer = determineWriter(context);
            invokerRequest.options().displayHelp(context.invokerRequest.parserRequest(), writer);
            throw new ExitException(0);
        }
        if (invokerRequest.options().showVersionAndExit().isPresent()) {
            showVersion(context);
            throw new ExitException(0);

            String fieldKey = field.getKey();
            String fieldDescription = "Configure " + fieldKey + ": " + field.getDescription();
            if (field.getOptions().isPresent()) {
                // list options
                ListPromptBuilder listPromptBuilder =
                        promptBuilder.createListPrompt().name(fieldKey).message(fieldDescription);

   * otherwise returns an empty stream.
   */
  public static <T> Stream<T> stream(com.google.common.base.Optional<T> optional) {
    return optional.isPresent() ? Stream.of(optional.get()) : Stream.empty();
  }

  /**
   * If a value is present in {@code optional}, returns a stream containing only that element,
   * otherwise returns an empty stream.
   *

                    .setProcessPlugins(request.isProcessPlugins());
            ProjectBuildingResult res;
            if (request.getPath().isPresent()) {
                Path path = request.getPath().get();
                res = builder.build(path.toFile(), req);
            } else if (request.getSource().isPresent()) {
                Source source = request.getSource().get();
                ModelSource2 modelSource = new SourceWrapper(source);