* </p>
 */
public class MavenProject implements Cloneable {

    private static final Logger LOGGER = LoggerFactory.getLogger(MavenProject.class);

    public static final String EMPTY_PROJECT_GROUP_ID = "unknown";

    public static final String EMPTY_PROJECT_ARTIFACT_ID = "empty-project";

    public static final String EMPTY_PROJECT_VERSION = "0";

    private Model model;

    private MavenProject parent;

                exceptionMessage = t.getClass().getSimpleName();
            }

            if (t instanceof UnknownHostException && !fullMessage.contains("host")) {
                fullMessage = join(fullMessage, "Unknown host " + exceptionMessage);
            } else if (!fullMessage.contains(exceptionMessage)) {
                fullMessage = join(fullMessage, exceptionMessage);
            }
        }

        // this should never happen since we checked all possible error sources before but better be sure
        if (result.hasExceptions()) {
            throw new ArtifactResolutionException(
                    "Unknown error during artifact resolution, " + request + ", " + result.getExceptions(),
                    request.getArtifact(),
                    request.getRemoteRepositories());
        }
    }

        this.modelId = null;
        this.location = null;
        this.inputs = ImmutableCollections.copy(inputs);
    }

    /**
     * Get the path/URL of the POM or {@code null} if unknown.
     *
     * @return the location
     */
    public String getLocation() {
        return this.location;
    }

    /**

    /**
     * The path identified by the Java {@code --patch-module} option.
     * Note that this option is incomplete, because it must be followed by a module name.
     * Use this type only when the module to patch is unknown.
     *
     * @see #patchModule(String)
     */
    PATCH_MODULE("--patch-module"),

    /**
     * The path identified by the Java {@code --processor-path} option.
     */

        this.executionId = null;
    }

    /**
     * Gets the source of this execution.
     *
     * @return The source of this execution or {@code null} if unknown.
     */
    public Source getSource() {
        return source;
    }

    public String getExecutionId() {
        return executionId;
    }

    public Plugin getPlugin() {

        if (defaultPlugins == null) {
            problems.add(new ModelProblemCollectorRequest(Severity.ERROR, Version.BASE)
                    .setMessage("Unknown packaging: " + packaging)
                    .setLocation(model.getLocation("packaging")));
        } else if (!defaultPlugins.isEmpty()) {
            List<Plugin> plugins = defaultPlugins.stream()

    public static final MavenProject Y = new MavenProject();

    public static final MavenProject Z = new MavenProject();

    public static final MavenProject UNKNOWN = new MavenProject();

    static {
        A.setArtifactId("A");
        B.setArtifactId("B");
        C.setArtifactId("C");
        X.setArtifactId("X");
        Y.setArtifactId("Y");

    public MissingRepositoryElementException(String message, String repositoryId) {
        super(message, repositoryId);
    }

    public MissingRepositoryElementException(String message) {
        super(message, "-unknown-");
    }

     * {@code <groupId>:<artifactId>:<version>} but some of these coordinates may still be unknown at the point the
     * exception is thrown so this information is merely meant to assist the user.
     *
     * @return The identifier of the POM or an empty string if not known, never {@code null}.
     */
    public String getModelId() {
        if (result == null || result.getModelIds().isEmpty()) {