Swing/TableCellTransferHandler のバックアップ(No.4)

class CellIconTransferHandler extends TransferHandler {
  protected final DataFlavor localObjectFlavor = new DataFlavor(Icon.class, "Icon");
  @Override protected Transferable createTransferable(JComponent c) {
    if (c instanceof JTable) {
      JTable table = (JTable) c;
      int row = table.getSelectedRow();
      int col = table.getSelectedColumn();
      if (Icon.class.isAssignableFrom(table.getColumnClass(col))) {
        // return new DataHandler(table, localObjectFlavor.getMimeType());
        return new Transferable() {
          @Override public DataFlavor[] getTransferDataFlavors() {
            return new DataFlavor[] {localObjectFlavor};
          }
          @Override public boolean isDataFlavorSupported(DataFlavor flavor) {
            return Objects.equals(localObjectFlavor, flavor);
          }
          @Override public Object getTransferData(DataFlavor flavor)
              throws UnsupportedFlavorException, IOException {
            if (isDataFlavorSupported(flavor)) {
              return table.getValueAt(row, col);
            } else {
              throw new UnsupportedFlavorException(flavor);
            }
          }
        };
      }
    }
    return null;
  }
  @Override public boolean canImport(TransferHandler.TransferSupport info) {
    Component c = info.getComponent();
    if (c instanceof JList) {
      return info.isDrop() && info.isDataFlavorSupported(localObjectFlavor);
    }
    return false;
  }
  @Override public int getSourceActions(JComponent c) {
    return TransferHandler.COPY;
  }
  @SuppressWarnings("unchecked")
  @Override public boolean importData(TransferHandler.TransferSupport info) {
    if (!canImport(info)) {
      return false;
    }
    JList l = (JList) info.getComponent();
    try {
      Object o = info.getTransferable().getTransferData(localObjectFlavor);
      if (o instanceof Icon) {
        ((DefaultListModel) l.getModel()).addElement(o);
      }
      return true;
    } catch (UnsupportedFlavorException | IOException ex) {
      ex.printStackTrace();
    }
    return false;
  }
}