DataManager

/***
 * USAGE:
 * DataManager.getInstance().setItemsList(itemsList);
 * 
 * Item item = DataManager.getInstance().getItemByIdx(5);
 * 
 * Please, notice that the getItemByIdx() function my throw an exception!!!
 */
public class DataManager {
    private static DataManager ourInstance = new DataManager();

    private static List<Item> itemsList = new ArrayList<>();

    public static DataManager getInstance() {
        return ourInstance;
    }

    private DataManager() {
    }


    public static List<Item> getItemsList() {
        return itemsList;
    }

    public static void setItemsList(List<Item> itemsList) {
        DataManager.itemsList = itemsList;
    }


    /**
     * Return an item be it's idex
     * @param idx The index of the desired item
     * @return The desired item
     * @throws IndexOutOfBoundsException in case the index is
     *          not valid
     */
    public static Item getItemByIdx(int idx) {
        return itemsList.get(idx);
    }
}