}
        if (FAIL_FAST.equals(failureBehavior)
                || FAIL_AT_END.equals(failureBehavior)
                || FAIL_NEVER.equals(failureBehavior)) {
            this.failureBehavior = failureBehavior;
        } else {
            throw new IllegalArgumentException("Invalid failure behavior (must be one of: '" + FAIL_FAST + "', '"
                    + FAIL_AT_END + "', '" + FAIL_NEVER + "').");
        }
    }

            return Optional.of(Boolean.TRUE);
        }
        return Optional.empty();
    }

    @Override
    public Optional<Boolean> failAtEnd() {
        if (commandLine.hasOption(CLIManager.FAIL_AT_END)) {
            return Optional.of(Boolean.TRUE);
        }
        return Optional.empty();
    }

    @Override
    public Optional<Boolean> failNever() {

    public static final String ALTERNATE_INSTALLATION_TOOLCHAINS = "it";

    public static final String FAIL_FAST = "ff";

    public static final String FAIL_ON_SEVERITY = "fos";

    public static final String FAIL_AT_END = "fae";

    public static final String FAIL_NEVER = "fn";

    public static final String RESUME = "r";

    public static final String RESUME_FROM = "rf";

    // Reactor Failure Mode
    // ----------------------------------------------------------------------

    String REACTOR_FAIL_FAST = "FAIL_FAST";

    String REACTOR_FAIL_AT_END = "FAIL_AT_END";

    String REACTOR_FAIL_NEVER = "FAIL_NEVER";

    // ----------------------------------------------------------------------
    // Reactor Make Mode

         * This method works in conjunction with the filtering in executePlan():
         * - For FAIL_FAST: Sets ReactorBuildStatus to halted, which causes executePlan to only process after:* steps
         * - For FAIL_AT_END: Blacklists the project and its dependents, which causes executePlan to skip them
         * - For FAIL_NEVER: Does nothing special, allowing all projects to continue building
         * <p>

        if (commandLine.hasOption(CLIManager.FAIL_FAST)) {
            return MavenExecutionRequest.REACTOR_FAIL_FAST;
        } else if (commandLine.hasOption(CLIManager.FAIL_AT_END)) {
            return MavenExecutionRequest.REACTOR_FAIL_AT_END;
        } else if (commandLine.hasOption(CLIManager.FAIL_NEVER)) {
            return MavenExecutionRequest.REACTOR_FAIL_NEVER;
        } else {