&& java.util.Objects.equals(e.getGroupId(), getGroupId())
                && java.util.Objects.equals(e.getVersion(), getVersion());
        } else {
            return false;
        }
    }

    /**
     * @see java.lang.Object#hashCode()
     */
    public int hashCode() {
        return java.util.Objects.hash(getArtifactId(), getGroupId(), getVersion());
    }
            ]]>

        Map<String, ArtifactRepository> versionIndex = new HashMap<>();

        Metadata metadata = new DefaultMetadata(
                request.getArtifact().getGroupId(),
                request.getArtifact().getArtifactId(),
                MAVEN_METADATA_XML,
                wantedNature);

        List<MetadataRequest> metadataRequests =

    //
    // ----------------------------------------------------------------------

    public PluginDescriptor() {}

    public PluginDescriptor(PluginDescriptor original) {
        this.setGroupId(original.getGroupId());
        this.setArtifactId(original.getArtifactId());
        this.setVersion(original.getVersion());
        this.setGoalPrefix(original.getGoalPrefix());

        @Override
        public boolean storedInGroupDirectory() {
            return metadata.getArtifactId().isEmpty();
        }

        @Override
        public String getGroupId() {
            return nullify(metadata.getGroupId());
        }

        @Override
        public String getArtifactId() {
            return nullify(metadata.getArtifactId());
        }

        @Override

                String str = ownerMojo != null ? " The " + ownerMojo.getId() : "A";
                String msg = str + " mojo is already being executed "
                        + "on the project " + session.getCurrentProject().getGroupId()
                        + ":" + session.getCurrentProject().getArtifactId() + ". "
                        + "This mojo execution will be blocked "
                        + "until the mojo is done.";

 * @see org.apache.maven.api.services.ProjectBuilder
 */
@Experimental
public interface Project {

    /**
     * {@return the project groupId}.
     */
    @Nonnull
    String getGroupId();

    /**
     * {@return the project artifactId}.
     */
    @Nonnull
    String getArtifactId();

    /**
     * {@return the project version}.
     */
    @Nonnull
    String getVersion();

    @Nonnull
    default DependencyCoordinates create(@Nonnull Session session, Dependency dependency) {
        return create(DependencyCoordinatesFactoryRequest.build(
                session,
                dependency.getGroupId(),
                dependency.getArtifactId(),
                dependency.getVersion(),
                dependency.getClassifier(),
                null,
                dependency.getType()));
    }

        Map<String, Plugin> index = new HashMap<>();

        for (Plugin plugin : plugins) {
            if (plugin.getGroupId() == null
                    || (plugin.getGroupId() != null
                            && plugin.getGroupId().trim().isEmpty())) {
                addViolation(
                        problems,
                        Severity.FATAL,
                        Version.V20,

                                parent.getVersion()),
                        parent.getGroupId(),
                        parent.getArtifactId(),
                        parent.getVersion());
            }

            parent.setVersion(versionRangeResult.getHighestVersion().toString());

            return resolveModel(parent.getGroupId(), parent.getArtifactId(), parent.getVersion());

                    }

                    if (relocation != null) {
                        if (relocation.getGroupId() != null) {
                            artifact.setGroupId(relocation.getGroupId());
                            relocatedArtifact = artifact;
                            project.setGroupId(relocation.getGroupId());
                        }
                        if (relocation.getArtifactId() != null) {