recipe class

public class GrinderRecipes
{
    private static final GrinderRecipes grindingBase = new GrinderRecipes();
    /** The list of grinding results. */
    private final Map grindingList = Maps.newHashMap();
    private final Map experienceList = Maps.newHashMap();

    public static GrinderRecipes instance()
    {
        return grindingBase;
    }

    private GrinderRecipes()
    {
        addGrindingRecipe(
              new ItemStack(Item.getItemFromBlock(Blocks.stonebrick)),
              new ItemStack(Item.getItemFromBlock(Blocks.gravel)), 0.7F);
        addGrindingRecipe(
              new ItemStack(Item.getItemFromBlock(Blocks.stone_slab)),
              new ItemStack(Item.getItemFromBlock(Blocks.gravel)), 0.7F);
        addGrindingRecipe(
              new ItemStack(Item.getItemFromBlock(Blocks.stone_slab2)),
              new ItemStack(Item.getItemFromBlock(Blocks.gravel)), 0.7F);
        addGrindingRecipe(
              new ItemStack(Item.getItemFromBlock(Blocks.stone_stairs)),
              new ItemStack(Item.getItemFromBlock(Blocks.gravel)), 0.7F);
    }

    public void addGrindingRecipe(ItemStack parItemStackIn,
          ItemStack parItemStackOut, float parExperience)
    {
        grindingList.put(parItemStackIn, parItemStackOut);
        experienceList.put(parItemStackOut, Float.valueOf(parExperience));
    }

    /**
     * Returns the grinding result of an item.
     */
    public ItemStack getGrindingResult(ItemStack parItemStack)
    {
        Iterator iterator = grindingList.entrySet().iterator();
        Entry entry;

        do
        {
            if (!iterator.hasNext())
            {
                return null;
            }

            entry = (Entry)iterator.next();
        }
        while (!areItemStacksEqual(parItemStack, (ItemStack)entry
              .getKey()));

        return (ItemStack)entry.getValue();
    }

    private boolean areItemStacksEqual(ItemStack parItemStack1,
          ItemStack parItemStack2)
    {
        return parItemStack2.getItem() == parItemStack1.getItem()
              && (parItemStack2.getMetadata() == 32767
              || parItemStack2.getMetadata() == parItemStack1
              .getMetadata());
    }

    public Map getGrindingList()
    {
        return grindingList;
    }

    public float getGrindingExperience(ItemStack parItemStack)
    {
        Iterator iterator = experienceList.entrySet().iterator();
        Entry entry;

        do
        {
            if (!iterator.hasNext())
            {
                return 0.0F;
            }

            entry = (Entry)iterator.next();
        }
        while (!areItemStacksEqual(parItemStack,
              (ItemStack)entry.getKey()));

        return ((Float)entry.getValue()).floatValue();
    }
}