Bug 5699 Add ResourceTransfer to packages view
The packages view should add the ResoruceTransfer as a drag source to its list of transfers
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/SelectionTransferDropAdapter.java
if (! canActivate(fMoveRefactoring))
				fCanMoveElements= 1;
		}
		return fCanMoveElements == 2;
	}
	
	private boolean canActivate(ReorgRefactoring ref){
		try{
			return ref.checkActivation(new NullProgressMonitor()).isOK();
		} catch(JavaModelException e){
			ExceptionHandler.handle(e, "Drag'n'drop", "Unexpected exception. See log for details.");
			return false;
		}
	}
	
	private void handleDropMove(final Object target, DropTargetEvent event) throws JavaModelException{
		new DragNDropMoveAction(StructuredSelectionProvider.createFrom(getViewer()), target).run();
	}
	
	private boolean handleValidateCopy(Object target, DropTargetEvent event) throws JavaModelException{
		if (fCopyRefactoring == null)
			fCopyRefactoring= new CopyRefactoring(fElements);
		
		if (!canCopyElements())
			return false;	
		return fCopyRefactoring.isValidDestination(target);
	}
			
	private boolean canCopyElements() {
		if (fCanCopyElements == 0) {