Bug 31113 Don't offer to do a deep copy/move of linked resources
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/SelectionTransferDropAdapter.java
}	
		
		if (fMoveRefactoring == null){
			IPackageFragmentRootManipulationQuery query= JdtMoveAction.createUpdateClasspathQuery(getViewer().getControl().getShell());
			fMoveRefactoring= new MoveRefactoring(fElements, JavaPreferencesSettings.getCodeGenerationSettings(), query, new ReorgQueries());
		}	
		
		if (!canMoveElements())
			return DND.DROP_NONE;	
		
		if (fMoveRefactoring.isValidDestination(target))
			return DND.DROP_MOVE;
		else
			return DND.DROP_NONE;	
	}
	
	private boolean canMoveElements() {
		if (fCanMoveElements == 0) {
			fCanMoveElements= 2;
			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, PackagesMessages.getString("SelectionTransferDropAdapter.error.title"), PackagesMessages.getString("SelectionTransferDropAdapter.error.message"));