@Override
  public Exporter<?, ?> getExporter(DataVertical transferDataType) {
    Preconditions.checkState(initialized);
    Preconditions.checkArgument(SUPPORTED_EXPORT_SERVICES.contains(transferDataType));
    return exporterMap.get(transferDataType);
  }
Bootstraps the Koofr data transfer services.
extensions/data-transfer/portability-data-transfer-koofr/src/main/java/org/datatransferproject/transfer/koofr/KoofrTransferExtension.java