this.executeLifecycle = executeLifecycle;
    }

    /**
     * @param aggregator <code>true</code> if the Mojo uses the Maven project and its child modules,
     * <code>false</code> otherwise.
     */
    public void setAggregator(boolean aggregator) {
        this.aggregator = aggregator;
    }

    /**
     * @return <code>true</code> if the Mojo uses the Maven project and its child modules,

        ProjectLock(MavenSession session, MojoDescriptor mojoDescriptor) {
            mojos.put(Thread.currentThread(), mojoDescriptor);
            boolean aggregator = mojoDescriptor.isAggregator();
            acquiredAggregatorLock = aggregator ? aggregatorLock.writeLock() : aggregatorLock.readLock();
            acquiredProjectLock = getProjectLock(session);
            if (!acquiredAggregatorLock.tryLock()) {

        if (requiresReports != null) {
            mojo.setRequiresReports(Boolean.parseBoolean(requiresReports));
        }

        String aggregator = c.getChild("aggregator").getValue();

        if (aggregator != null) {
            mojo.setAggregator(Boolean.parseBoolean(aggregator));
        }

        String requiresOnline = c.getChild("requiresOnline").getValue();

        if (requiresOnline != null) {

                scenario("Selected aggregator project (including child modules)")
                        .activeRequiredProjects(MODULE_C)
                        .expectResult(MODULE_C, MODULE_C_1, MODULE_C_2),
                scenario("Selected aggregator project with non-recursive")
                        .activeRequiredProjects(MODULE_C)

        this.messageBuilderFactory = messageBuilderFactory;
    }

    public static List<MavenProject> getProjects(MavenProject project, MavenSession session, boolean aggregator) {
        if (aggregator && project.getCollectedProjects() != null) {
            // get the unsorted list of wanted projects
            Set<MavenProject> projectAndSubmodules = new HashSet<>(project.getCollectedProjects());

    }

    @Test
    void testInvalidAggregatorPackaging() throws Exception {
        SimpleProblemCollector result = validate("invalid-aggregator-packaging-pom.xml");

        assertViolations(result, 0, 1, 0);

        assertTrue(result.getErrors().get(0).contains("Aggregator projects require 'pom' as packaging."));
    }

    @Test
    void testMissingDependencyArtifactId() throws Exception {

        return !((version == null || version.isEmpty()) || version.startsWith("[") || version.startsWith("("));
    }

    // TODO !![jc; 28-jul-2005] check this; if we're using '-r' and there are aggregator tasks, this will result in
    // weirdness.
    public MavenProject getTopLevelProject() {
        return sortedProjects.stream()
                .filter(MavenProject::isExecutionRoot)
                .findFirst()

    /**
     * Returns the original project being built when the input project is a forked project.
     * During certain lifecycle phases, particularly for aggregator mojos, Maven may create
     * a forked project (a copy of the original project) to execute a subset of the lifecycle.
     * This method allows retrieving the original project that initiated the build.
     *

          <defaultValue>false</defaultValue>
        </field>
        <field>
          <name>aggregator</name>
          <version>1.0.0+</version>
          <type>boolean</type>
          <description>
            Flags this Mojo to run it in a multi-module way, i.e. aggregate the build with the set of projects
            listed as modules.
          </description>

            assertTrue(result.success(), "Orchestrator should succeed");
            assertEquals(2, result.processedPoms().size(), "Should aggregate processed POMs");
            assertEquals(2, result.modifiedPoms().size(), "Should aggregate modified POMs");
            assertEquals(0, result.errorPoms().size(), "Should have no errors");
        }

        @Test