code: public void registerDropPasteWorker(DropPasteWorkerInterface worker)
      {
          this.dropPasteWorkerSet.add(worker);
          defaultDropTarget.setDefaultActions( 
              defaultDropTarget.getDefaultActions() 
              | worker.getAcceptableActions(defaultDropTarget.getComponent())
                                             );
      }
docs: Register a new DropPasteWorkerInterface.
  @param worker The new worker