import java.awt.datatransfer.*;

static class MultiTransferable implements Transferable {
  new L<Transferable> transferables;

  public void add(Transferable transferable) {
    transferables.add(transferable);
  }

  public DataFlavor[] getTransferDataFlavors() {
    List<DataFlavor> flavors = new ArrayList<DataFlavor>();
    for (Transferable transferable : transferables)
      flavors.addAll(asList(transferable.getTransferDataFlavors()));
    return flavors.toArray(new DataFlavor[flavors.size()]);
  }

  public boolean isDataFlavorSupported(DataFlavor flavor) {
    for (Transferable transferable : transferables)
      if (transferable.isDataFlavorSupported(flavor))
        return true;
    return false;
  }

  public Object getTransferData(DataFlavor flavor) throws UnsupportedFlavorException, IOException {
    for (Transferable transferable : transferables)
      if (transferable.isDataFlavorSupported(flavor))
        return transferable.getTransferData(flavor);
    return null;
  }
}