public class ExkvaRecipeData {

    static class RecipeIn {

        private ItemStack[] in;

        RecipeIn(ItemStack[] input) {
            this.in = input.clone();
        }
    }

    static class RecipeOut {

        private Item out;
        private int amt;

        RecipeOut(Item item, int quantity) {
            this.out = item;
            this.amt = quantity;
        }

        public Item getOut() { return out; }

        public int getAmt() { return amt; }
    }

    protected static Map<RecipeIn, RecipeOut> recipes = new HashMap<RecipeIn, RecipeOut>();

    public static void registerRecipe(ItemStack[] input, Item output, int quantity) {

        recipes.put(new RecipeIn(input), new RecipeOut(output, quantity));
    }

    public static ItemStack getOutput(RecipeIn in) {
        RecipeOut result = recipes.get(in);
        return new ItemStack(result.getOut(), result.getAmt());
    }
}