*/
    @Nullable
    <T> T get(@Nonnull Key<T> key);

    /**
     * Retrieve of compute the data associated with the specified key.
     *
     * @param key the key for which to retrieve the session data, must not be {@code null}
     * @param supplier the supplier will compute the new value
     * @return the session data associated with the key
     */
    @Nullable

                .getOrDefault(artifact.getBaseVersion(), null);
    }

    // groupId -> (artifactId -> (version -> project)))
    private Map<String, Map<String, Map<String, MavenProject>>> getAllProjects() {
        // compute the projects mapping
        if (allProjects == null) {
            List<MavenProject> allProjects = session.getAllProjects();
            if (allProjects != null) {

        this.id = id;
        this.transitive = transitive;
    }

    /**
     * The {@code id} uniquely represents a value for this extensible enum.
     * This id should be used to compute the equality and hash code for the instance.
     *
     * @return the id
     */
    @Nonnull
    public String id() {
        return id;
    }

    public boolean isTransitive() {

     * @see #getModuleInfo(Path)
     */
    private final Map<Path, PathModularization> moduleInfo;

    /**
     * Whether JAR files are modular. This map is redundant with {@link #moduleInfo},
     * but cheaper to compute when the module names are not needed.
     *
     * @see #getPathType(Path)
     */
    private final Map<Path, PathType> pathTypes;

    /**
     * Creates an initially empty cache.
     */

     * @see #getModuleInfo(Path)
     */
    private final Map<Path, PathModularization> moduleInfo;

    /**
     * Whether JAR files are modular. This map is redundant with {@link #moduleInfo},
     * but cheaper to compute when the module names are not needed.
     *
     * @see #getPathType(Path)
     */
    private final Map<Path, PathType> pathTypes;

    /**
     * Creates an initially empty cache.
     */

 *
 * @since 4.0.0
 */
@Experimental
public interface ExtensibleEnum {

    /**
     * The {@code id} uniquely represents a value for this extensible enum.
     * This id should be used to compute the equality and hash code for the instance.
     *
     * @return the id
     */
    @Nonnull
    String id();

        List<LifecycleMojo> mojos = goals.getMojos();
        if (mojos != null) {
            for (int i = 0; i < mojos.size(); i++) {
                LifecycleMojo mojo = mojos.get(i);

                // Compute goal coordinates
                String groupId, artifactId, version, goal;
                String[] p = mojo.getGoal().trim().split(":");
                if (p.length == 3) {

     * @return the system properties, never {@code null}
     */
    @Nonnull
    Map<String, String> getSystemProperties();

    /**
     * Each invocation computes a new map of effective properties. To be used in interpolation.
     * <p>
     * Effective properties are computed from system, user and optionally project properties, layered with
     * defined precedence onto each other to achieve proper precedence. Precedence is defined as:

    String id();

    /**
     * Collection of phases for this lifecycle
     */
    Collection<Phase> phases();

    /**
     * Pre-ordered list of phases.
     * If not provided, a default order will be computed.
     */
    default Optional<List<String>> orderedPhases() {
        return Optional.empty();
    }

    /**
     * A phase in the lifecycle.
     */
    interface Phase {
        String name();

    <p>The <a href="/plugins/maven-toolchains-plugin/">toolchains-plugin</a> can read available toolchains on the user's computer
    and match them against the toolchain requirements of the project (as configured in {@code pom.xml}):
    if match is found, the toolchain instance is made available to other Maven plugins.</p>