.project(nonNull(project, "project cannot be null"))
                .build();
    }

    @Nonnull
    static DependencyCollectorRequestBuilder builder() {
        return new DependencyCollectorRequestBuilder();
    }

    @NotThreadSafe
    class DependencyCollectorRequestBuilder {

        Session session;
        Project project;
        Artifact rootArtifact;
        DependencyCoordinate root;

                .dependencies(dependencies)
                .pathScope(scope)
                .build();
    }

    @NotThreadSafe
    class DependencyResolverRequestBuilder extends DependencyCollectorRequestBuilder {
        PathScope pathScope;

        Predicate<PathType> pathTypeFilter;

        @Nonnull
        @Override
        public DependencyResolverRequestBuilder session(@Nonnull Session session) {