public class DarkPortalCrafting
{
    private static List<Item[]> darkPortalIngredients;
    private static List<ItemStack> darkPortalOutputs;

    public static void init()
    {
        darkPortalIngredients = new ArrayList<Item[]>();
        darkPortalOutputs = new ArrayList<ItemStack>();

        addDarkPortalRecipe(new ItemStack(ModItems.itemShadowHead), ModItems.itemHumanHeart, Items.DIAMOND_HELMET);
    }

    private static void addDarkPortalRecipe(ItemStack output, Item... inputs)
    {
        darkPortalIngredients.add(inputs);
        darkPortalOutputs.add(output);
    }

    @Nullable
    public static ItemStack getOutput(ItemStack... inputs)
    {
        for(int i = 0; i < inputs.length; i++)
        {
            System.out.println(inputs[i].toString());
        }
        if(matches(inputs) != Int.MinValue())
        {
            return darkPortalOutputs.get(matches(inputs));
        }

        return null;
    }

    private static int matches(ItemStack[] inputs)
    {
        int matchingItems = 0;
        for(int i = 0; i < darkPortalIngredients.size(); i++)
        {
            for(int j = 0; i < inputs.length; j++)
            {
                System.out.print(inputs[i].toString());
                if(darkPortalIngredients.get(i)[i] == inputs[j].getItem())
                {
                    matchingItems++;
                }
                if(matchingItems == darkPortalIngredients.get(i).length)
                {
                    return i;
                }
            }
        }
        return Int.MinValue();
    }
}