}
            };
        }
    };

    static <E1, E2 extends E1> List<E1> copy(Collection<E2> collection) {
        return collection == null ? List.of() : List.copyOf(collection);
    }

    static <K, V> Map<K, V> copy(Map<K, V> map) {
        if (map == null) {
            return emptyMap();
        } else if (map instanceof AbstractImmutableMap) {
            return map;
        } else {

        newInterfaces.keySet().removeAll(oldInterfaces.keySet())

        if (newInterfaces.isEmpty()) {
            return null
        }

        List<String> changes = filterChangesToReport(newClass, newInterfaces)
        if (changes.isEmpty()) {
            return null
        }
        return acceptOrReject(c, changes, Violation.error(c, " introduces internal or incubating interfaces"))
    }

     * variable lookup.
     *
     * @param props The properties to add the environment variables to, may be {@code null}.
     */
    public static void addEnvVars(Properties props) {
        if (props != null) {
            if (envVars == null) {
                Properties tmp = new Properties();
                boolean caseSensitive = !Os.IS_WINDOWS;

            throws ArtifactMetadataRetrievalException {
        Set<Artifact> dependencies = new HashSet<>();

        if ("g".equals(artifact.getArtifactId())) {
            Artifact a = null;
            try {
                a = factory.createBuildArtifact("org.apache.maven", "h", "1.0", "jar");
                dependencies.add(a);
            } catch (Exception e) {

     *
     * @param relPath is the path of the requested model source relative to this model source POM.
     * @return related model source or <code>null</code> if no such model source.
     */
    ModelSource2 getRelatedSource(String relPath);

    /**
     * Returns location of the POM, never <code>null</code>.
     */
    URI getLocationURI();

     * @return the terminal's output charset or the system default charset
     */
    private static Charset getTerminalCharset(Terminal terminal) {
        if (terminal != null && terminal.encoding() != null) {
            return terminal.encoding();
        }
        return Charset.defaultCharset();
    }

    /**
     * Returns the Unicode character for this icon.
     *

     * cache.
     *
     * @param project The project that employs the plugin realm, must not be {@code null}.
     * @param record The cache record being used for the project, must not be {@code null}.
     */
    void register(MavenProject project, Key key, CacheRecord record);

        fire(eventType, session, mojoExecution, null);
    }

    @Override
    public void fire(
            ExecutionEvent.Type eventType, MavenSession session, MojoExecution mojoExecution, Exception exception) {
        ExecutionListener listener = session.getRequest().getExecutionListener();

        if (listener != null) {

        public void mergeManagedDependencies(Model model) {
            DependencyManagement dependencyManagement = model.getDependencyManagement();
            if (dependencyManagement != null) {
                Map<Object, Dependency> dependencies = new HashMap<>();
                Map<Object, Object> context = Collections.emptyMap();

                for (Dependency dependency : model.getDependencies()) {

    @BeforeEach
    void setUp() throws Exception {
        configurator = new DefaultBeanConfigurator();
    }

    @AfterEach
    void tearDown() throws Exception {
        configurator = null;
    }

    private Xpp3Dom toConfig(String xml) {
        try {
            return new Xpp3Dom(XmlService.read(new StringReader("<configuration>" + xml + "</configuration>")));
        } catch (XMLStreamException e) {