for (CoreExtensions coreExtensions : configuredCoreExtensions) {
            for (CoreExtension coreExtension : coreExtensions.coreExtensions()) {
                String key = coreExtension.getGroupId() + ":" + coreExtension.getArtifactId();
                CoreExtension conflict = selectedExtensions.putIfAbsent(key, coreExtension);

        for (ProjectSegment projectBuild : items) {
            MavenProject project = projectBuild.getProject();
            String key = ArtifactUtils.key(project.getGroupId(), project.getArtifactId(), project.getVersion());
            projectKeys.add(key);
        }
        return projectKeys;
    }

    public boolean isEmpty() {
        return items.isEmpty();
    }

                    // fill in domain md with actual version data
                    ArtifactMetadata md = v.getMd();
                    ArtifactMetadata newMd = new ArtifactMetadata(
                            md.getGroupId(),
                            md.getArtifactId(),
                            edge.getVersion(),
                            md.getType(),
                            md.getScopeAsEnum(),

        private final int hashCode;

        CacheKey(Plugin plugin, List<RemoteRepository> repositories, RepositorySystemSession session) {
            groupId = plugin.getGroupId();
            artifactId = plugin.getArtifactId();
            version = plugin.getVersion();

            workspace = RepositoryUtils.getWorkspace(session);
            localRepo = session.getLocalRepository();

    }

    private void debugMojoExecution(MojoExecution mojoExecution) {
        String mojoExecId =
                mojoExecution.getGroupId() + ':' + mojoExecution.getArtifactId() + ':' + mojoExecution.getVersion()
                        + ':' + mojoExecution.getGoal() + " (" + mojoExecution.getExecutionId() + ')';

    }

    /**
     * Gets the group id of the unresolvable model.
     *
     * @return The group id of the unresolvable model, can be empty but never {@code null}.
     */
    public String getGroupId() {
        return groupId;
    }

    /**
     * Gets the artifact id of the unresolvable model.
     *
     * @return The artifact id of the unresolvable model, can be empty but never {@code null}.

        request.setActiveProfileIds(List.of("profile1"));

        MavenProject project = projectBuilder.build(testPom, request).getProject();

        String id = project.getGroupId() + ":" + project.getArtifactId() + ":" + project.getVersion();
        assertTrue(project.getInjectedProfileIds().keySet().containsAll(List.of("external", id)));

        int dot = name.lastIndexOf('.');
        String ext = dot >= 1 ? name.substring(dot + 1) : "";
        ProducedArtifact artifact = session.createProducedArtifact(
                project.getGroupId(), project.getArtifactId(), project.getVersion(), ext);
        attachArtifact(project, artifact, path);
    }

    /**
     * Attaches an artifact to the project with an explicitly specified type.
     *

                            artifact.getVersion().contains(",") ? parseVersionRange(artifact.getVersion()) : null;
                    Predicate<Artifact> predicate = a -> {
                        if (artifact.getGroupId().equals(a.getGroupId())
                                && artifact.getArtifactId().equals(a.getArtifactId())) {
                            if (versionRange != null) {

        // Weight = 1 + max downstream weight (similar to Takari Smart Builder)
        return 1L + maxDownstreamWeight;
    }

    private String getProjectId(MavenProject project) {
        return project.getGroupId() + ":" + project.getArtifactId() + ":" + project.getVersion();
    }