Modifying JTree node text before editing

Is it possible to be able to modify the text of a JTree node before it is edited? I want to allow the user to only modify a part of the node text but I can't see any method to set the text in the tree cell editor classes. At the moment the entire node text that is displayed is passed into the editing control. There's a prepareForEditing() method in DefaultTreeCellEditor that looks like the right time to set the text but how can I modify the text being edited?

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And loving it,

-Q
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