Drag and Drop: Moving or Copying when droping the item ?

Hello,
I'm trying to use the drag and drop feature on a JTree. The problem is that depending on wether I'm moving or copying an item, I need to do something different when I'm dropping my item (I have some database id to generate if I'm copying). The only problem is that in the importData method of the TransferHandler Class, I do not have the information of wether I'm moving or copying my item.
I would need something like :
public boolean importData(JComponent component, Transferable t, int action);And I only have:
public boolean importData(JComponent component, Transferable t);Am I misunderstanding something with the drag and drop mechanism ?
Is there a solution to get this "action" information ?
I tried to subclass the DropTargetListener class of the TransferHandler, but I couldn't because of private attribute.
Does anybody has a clue ?

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Drag and Drop: Moving or Copying when droping the item ?

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