}

    @Override
    public synchronized ModelSource getModelSource() {
        if (modelSource == null && pomPath != null) {
            modelSource = new FileModelSource(pomPath);
        }
        return modelSource;
    }

    @Override
    public DefaultModelBuildingRequest setModelSource(ModelSource modelSource) {
        this.modelSource = modelSource;

        return this;
    }

    static ModelBuilderRequest build(@Nonnull ModelBuilderRequest request, @Nonnull ModelSource source) {
        return builder(nonNull(request, "request cannot be null"))
                .source(nonNull(source, "source cannot be null"))
                .build();
    }

    @Nonnull
    static ModelBuilderRequest build(@Nonnull Session session, @Nonnull ModelSource source) {
        return builder()

        }

        return new ArtifactModelSource(pomArtifact.getFile(), groupId, artifactId, version);
    }

    record Result(ModelSource source, Parent parent, Exception e) {}

    @Override
    public ModelSource resolveModel(final Parent parent, AtomicReference<Parent> modified)
            throws UnresolvableModelException {
        Result result;
        try {

        File pomFile = new File("src/test/resources/projects/modelsource/module01/pom.xml");
        MavenSession mavenSession = createMavenSession(pomFile);
        ProjectBuildingRequest configuration = new DefaultProjectBuildingRequest();
        configuration.setRepositorySession(mavenSession.getRepositorySession());
        ModelSource modelSource = new FileModelSource(pomFile);
        ProjectBuildingResult result = getContainer()

    }

    static class BaseModelResolver implements ModelResolver {
        @Override
        public ModelSource resolveModel(String groupId, String artifactId, String version)
                throws UnresolvableModelException {
            return null;
        }

        @Override
        public ModelSource resolveModel(Parent parent, AtomicReference<Parent> modified)
                throws UnresolvableModelException {

        }
    }

    @Override
    public ModelSource resolveModel(org.apache.maven.model.Parent parent) throws UnresolvableModelException {
        AtomicReference<org.apache.maven.api.model.Parent> resolvedParent = new AtomicReference<>();
        ModelSource result = resolveModel(parent.getDelegate(), resolvedParent);
        if (resolvedParent.get() != null) {

     *
     * @return The source of the POM or {@code null} if not set.
     */
    ModelSource getModelSource();

    /**
     * Sets the source of the POM to process. Eventually, either {@link #setModelSource(ModelSource)} or
     * {@link #setPomPath(Path)} must be set.
     *
     * @param modelSource The source of the POM to process, may be {@code null}.
     * @return This request, never {@code null}.
     */

        request.setProcessPlugins(false);
        request.setValidationLevel(ModelBuildingRequest.VALIDATION_LEVEL_MINIMAL);

        ModelSource modelSource = new UrlModelSource(getClass().getResource("standalone.xml"));

        MavenProject project = projectBuilder.build(modelSource, request).getProject();
        project.setExecutionRoot(true);
        return project;
    }

import org.apache.maven.api.services.ModelBuilderResult;
import org.apache.maven.api.services.ModelProblemCollector;
import org.apache.maven.api.services.ModelResolver;
import org.apache.maven.api.services.ModelSource;
import org.apache.maven.api.services.ModelTransformer;
import org.apache.maven.api.services.SuperPomProvider;
import org.apache.maven.api.services.model.DependencyManagementImporter;

import org.apache.maven.api.services.ModelRepositoryHolder;
import org.apache.maven.api.services.ModelResolver;
import org.apache.maven.api.services.ModelResolverException;
import org.apache.maven.api.services.ModelSource;
import org.apache.maven.internal.impl.InternalSession;
import org.apache.maven.internal.impl.model.ModelProblemUtils;
import org.eclipse.aether.RepositoryEvent;
import org.eclipse.aether.RepositoryEvent.EventType;