public Bag getDiscsWithStability(Stability stability) {
    	LOGGER.log(Level.INFO, "Getting discs with stability " + stability);
    	
        Bag discBag = new Bag();
        for (int i = 0; i < discs.size(); i++) {
            if (discs.get(i).getStability() == stability) {
                discBag.addDisc(discs.get(i));
            }
        }
        
        LOGGER.log(Level.INFO, "Found " + discBag.size() + " discs with stability " + stability);
        return discBag;
    }