/**
 * The result of a dependency resolution request.
 *
 * @since 4.0.0
 * @see DependencyResolver#resolve(DependencyResolverRequest)
 */
@Experimental
public interface DependencyResolverResult {

    /**
     * Gets the exceptions that occurred while building the dependency graph.
     *
     * @return the exceptions that occurred, never {@code null}
     */
    @Nonnull

    @Nonnull
    default DependencyResolverResult flatten(@Nonnull Session session, @Nonnull Project project) {
        return flatten(
                DependencyResolverRequest.build(session, DependencyResolverRequest.RequestType.FLATTEN, project));
    }

    @Nonnull
    default DependencyResolverResult flatten(

     */
    @Override
    public DependencyResolverResult resolve(DependencyResolverRequest request)
            throws DependencyResolverException, DependencyResolverException, ArtifactResolverException {
        InternalSession session =
                InternalSession.from(nonNull(request, "request").getSession());
        DependencyResolverResult result;
        DependencyResolverResult collectorResult = collect(request);

 * and the field type can be {@link org.apache.maven.api.Node Node},
 * {@code List<}{@link org.apache.maven.api.Node Node}{@code >},
 * {@link org.apache.maven.api.services.DependencyResolverResult DependencyResolverResult},
 * {@code List<}{@link java.nio.file.Path Path}{@code >},
 * {@code Map<}{@link org.apache.maven.api.PathType PathType}{@code , List<}{@link java.nio.file.Path Path}{@code >>},

import java.util.Optional;

import org.apache.maven.api.Project;
import org.apache.maven.api.annotations.Nonnull;
import org.apache.maven.api.services.BuilderProblem;
import org.apache.maven.api.services.DependencyResolverResult;
import org.apache.maven.api.services.ProjectBuilder;
import org.apache.maven.api.services.ProjectBuilderException;
import org.apache.maven.api.services.ProjectBuilderRequest;

    /**
     * Gets the result of the dependency resolution for the project.
     *
     * @return the result of the dependency resolution for the project
     */
    @Nonnull
    Optional<DependencyResolverResult> getDependencyResolverResult();

import java.util.Objects;
import java.util.Optional;
import java.util.stream.Collectors;

import org.apache.maven.api.*;
import org.apache.maven.api.services.DependencyResolver;
import org.apache.maven.api.services.DependencyResolverResult;
import org.apache.maven.api.services.ProjectBuilder;
import org.apache.maven.api.services.ProjectBuilderRequest;
import org.apache.maven.api.services.SettingsBuilder;

import org.apache.maven.api.annotations.Provider;

/**
 * Represents a dependency node within a Maven project's dependency collector.
 *
 * @since 4.0.0
 * @see org.apache.maven.api.services.DependencyResolverResult#getRoot()
 */
@Experimental
@Immutable
@Provider
public interface Node {

    /**
     * @return artifact for this node
     */
    @Nullable
    Artifact getArtifact();

    /**

                PathScope ps = sessionV4.getService(PathScopeRegistry.class).require(pathScope);
                DependencyResolverResult res =
                        sessionV4.getService(DependencyResolver.class).resolve(sessionV4, project, ps);
                if (field.getType() == DependencyResolverResult.class) {
                    result = res;
                } else if (field.getType() == Node.class) {

import org.apache.maven.api.PathType;
import org.apache.maven.api.services.DependencyResolverException;
import org.apache.maven.api.services.DependencyResolverRequest;
import org.apache.maven.api.services.DependencyResolverResult;

/**
 * The result of collecting dependencies with a dependency resolver.
 * New instances are initially empty. Callers must populate with calls
 * to the following methods, in that order:
 *
 * <ul>