java.io.File projectDir,
            ModelBuildingRequest request,
            ModelProblemCollector problems) {
        return new org.apache.maven.model.Model(interpolateModel(
                model.getDelegate(), projectDir != null ? projectDir.toPath() : null, request, problems));
    }

    @Override
    public org.apache.maven.model.Model interpolateModel(
            org.apache.maven.model.Model model,

        Objects.requireNonNull(toolchains, "toolchains cannot be null");

        try (Writer out = output) {
            new MavenToolchainsStaxWriter().write(out, toolchains.getDelegate());
        } catch (XMLStreamException e) {
            throw new IOException("Error writing toolchains", e);
        }
    }

    }

    public BaseObject(Object delegate, ChildrenTracking parent) {
        this.delegate = requireNonNull(delegate, "delegate cannot be null");
        this.childrenTracking = parent;
    }

    public Object getDelegate() {
        return delegate;
    }

    public void update(Object newDelegate) {
        if (delegate != newDelegate) {
            if (childrenTracking != null) {

    private Map<String, LifecyclePhase> defaultPhases;

    private org.apache.maven.api.Lifecycle lifecycle;

    public String getId() {
        return id;
    }

    public org.apache.maven.api.Lifecycle getDelegate() {
        return lifecycle;
    }

    public List<String> getPhases() {
        return phases;
    }

    static Map<String, LifecyclePhase> getDefaultPhases(org.apache.maven.api.Lifecycle lifecycle) {

    }

    /**
     * {@inheritDoc}
     */
    public String getLastExpression() {
        return ((QueryEnabledValueSource) getDelegate()).getLastExpression();
    }

    }

    private static Optional<String> getActivationPackaging(org.apache.maven.model.Profile profile) {
        return Optional.ofNullable(profile)
                .map(org.apache.maven.model.Profile::getDelegate)
                .map(Profile::getActivation)
                .map(Activation::getPackaging);
    }

                        createMetadataFromArtifact(artifact).getDelegate(), true)
                .modelEncoding("UTF-16")
                .build());
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        new MetadataStaxWriter().write(baos, source.getDelegate());
        Metadata source2 =

        try {
            Files.createDirectories(metadataPath.getParent());
            try (OutputStream output = Files.newOutputStream(metadataPath)) {
                new MetadataStaxWriter().write(output, metadata.getDelegate());
            }
        } catch (IOException | XMLStreamException e) {
            throw new RepositoryException("Could not write metadata " + metadataPath + ": " + e.getMessage(), e);
        }
    }

        return repositories == null ? null : map(repositories, this::toArtifactRepository);
    }

    @Nonnull
    @Override
    public Settings getSettings() {
        return getMavenSession().getSettings().getDelegate();
    }

    @Nonnull
    @Override
    public Map<String, String> getUserProperties() {
        return Collections.unmodifiableMap(new PropertiesAsMap(getMavenSession().getUserProperties()));
    }

            ModelProblemCollector problems) {
        return getActiveProfiles(profiles.stream().map(Profile::new).collect(Collectors.toList()), context, problems)
                .stream()
                .map(Profile::getDelegate)
                .collect(Collectors.toList());
    }