private synchronized Drive getDriveInterface(TokensAndUrlAuthData authData) {
    if (driveInterface == null) {
      driveInterface = DriveExporter.makeDriveInterface(authData, credentialFactory);
    }

    return driveInterface;
  }
An {@link Importer} to import data to Google Drive.
extensions/data-transfer/portability-data-transfer-google/src/main/java/org/datatransferproject/datatransfer/google/drive/DriveImporter.java