sb.append("TransferEvent[");

        switch (this.getRequestType()) {
            case REQUEST_GET:
                sb.append("GET");
                break;
            case REQUEST_PUT:
                sb.append("PUT");
                break;
            default:
                sb.append(this.getRequestType());
                break;
        }

        sb.append('|');

            if (event.getException() != null) {
                evt = new ArtifactTransferEvent(wagon, event.getException(), event.getRequestType(), artifact);
            } else {
                evt = new ArtifactTransferEvent(wagon, event.getEventType(), event.getRequestType(), artifact);
            }

            evt.setLocalFile(event.getLocalFile());

            return evt;
        }
    }

         */
        REQUEST_DOMINANT,
    }

    @Nonnull
    ModelSource getSource();

    @Nonnull
    RequestType getRequestType();

    boolean isLocationTracking();

    boolean isRecursive();

    /**
     * Defines external profiles that may be activated for the given model.

     * @see DependencyResolver#collect(Session, Artifact, PathScope)
     */
    @Nonnull
    default DependencyResolverResult collect(@Nonnull DependencyResolverRequest request) {
        if (request.getRequestType() != DependencyResolverRequest.RequestType.COLLECT) {
            throw new IllegalArgumentException("requestType should be COLLECT when calling collect()");
        }
        return resolve(request);
    }

@Experimental
@Immutable
public interface DependencyResolverRequest extends Request<Session> {

    enum RequestType {
        COLLECT,
        FLATTEN,
        RESOLVE
    }

    @Nonnull
    RequestType getRequestType();

    @Nonnull
    Optional<Project> getProject();

    @Nonnull
    Optional<Artifact> getRootArtifact();

    @Nonnull
    Optional<DependencyCoordinates> getRoot();

    @Nonnull