public ArrayList<LineData> linesForCategory(MealCategoryData category) {
	ArrayList<LineData> lines = new ArrayList<LineData>();
	for (LineData canteenLine : canteenData.getLines()) {
		for (MealData meal : canteenLine.getTodayMeals()) {
			if (meal.getMealCategory().equals(category)) {
				lines.add(canteenLine);
			}
		}
	}
	return lines;
}