if (!requiredSelectors.isEmpty() || !optionalSelectors.isEmpty()) {
            Set<MavenProject> selectedProjects =
                    projectSelector.getActiveProjects(request, allSortedProjects, projectActivation.getActivations());

            // it can be empty when an optional project is missing from the reactor, fallback to returning all projects
            if (!selectedProjects.isEmpty()) {

    /**
     * List of activated and deactivated projects.
     */
    private final List<ProjectActivationSettings> activations = new ArrayList<>();

    public List<ProjectActivationSettings> getActivations() {
        return Collections.unmodifiableList(activations);
    }

    /**
     * Adds a project activation to the request.
     * @param selector The selector of the project.

                clone.getActivation().getProperty().getName());
        assertEquals(
                p.getActivation().getProperty().getValue(),
                clone.getActivation().getProperty().getValue());
        assertEquals(
                p.getActivation().getOs().getArch(),
                clone.getActivation().getOs().getArch());
        assertEquals(

        return JDK_VERSION;
    }

    @Override
    protected boolean canDetectActivation(Profile profile) {
        return profile.getActivation() != null
                && profile.getActivation().getJdk() != null
                && !profile.getActivation().getJdk().isEmpty();
    }

                .getProfiles()
                .get(1)
                .getActivation()
                .getFile()
                .getExists();

        assertEquals(originalExists, resultExists);
        assertTrue(result.getEffectiveModel()
                .getProfiles()
                .get(1)
                .getActivation()
                .getFile()
                .getExists()

    private static final String REGEX_PREFIX = "regex:";

    @Override
    public boolean isActive(Profile profile, ProfileActivationContext context, ModelProblemCollector problems) {
        Activation activation = profile.getActivation();

        if (activation == null) {
            return false;
        }

        ActivationOS os = activation.getOs();

        if (os == null) {
            return false;
        }

    @Override
    public boolean canDetermineActivation(Profile profile) {
        Activation activation = profile.getActivation();
        return activation != null && activation.getOs() != null;
    }

    @Override
    public boolean isActive(Profile profile) {
        Activation activation = profile.getActivation();
        ActivationOS os = activation.getOs();

        boolean result = ensureAtLeastOneNonNull(os);

    }

    @Override
    protected boolean canDetectActivation(Profile profile) {
        return profile.getActivation() != null && profile.getActivation().getProperty() != null;
    }

    @Override
    public boolean isActive(Profile profile) throws ProfileActivationException {
        Activation activation = profile.getActivation();

        ActivationProperty property = activation.getProperty();

        if (property != null) {

    private Logger logger;

    @Override
    protected boolean canDetectActivation(Profile profile) {
        return profile.getActivation() != null && profile.getActivation().getFile() != null;
    }

    @Override
    public boolean isActive(Profile profile) {
        Activation activation = profile.getActivation();

        ActivationFile actFile = activation.getFile();

        if (actFile != null) {

    @Override
    public boolean isActive(Profile profile, ProfileActivationContext context, ModelProblemCollector problems) {
        Activation activation = profile.getActivation();

        if (activation == null) {
            return false;
        }

        ActivationProperty property = activation.getProperty();

        if (property == null) {
            return false;