Inventory Save/Restore

public static void saveGenericInventory(Inventory inv, File f) throws IOException {
        FileConfiguration c = YamlConfiguration.loadConfiguration(f);

        for(int i = 0; i < inv.getSize(); i++){
            if(inv.getItem(i) == null){
                inv.setItem(i, new ItemStack(Material.AIR));
            }
        }

        c.set("inventory.content", inv.getContents());
        c.set("inventory.size", inv.getSize());
        c.save(f);
    }

    @SuppressWarnings("unchecked")
    public static Inventory restoreGenericInventory(File f) throws IOException {
        Inventory inv = Bukkit.createInventory(null, 9, "");

        if(f.exists()){
            FileConfiguration c = YamlConfiguration.loadConfiguration(f);
            inv = Bukkit.createInventory(null, c.getInt("inventory.size"), "");
            ItemStack[] content = ((List<ItemStack>) c.get("inventory.content")).toArray(new ItemStack[0]);
            inv.setContents(content);
        }
        return inv;
    }