minecraft-kajetans-mod/src/main/java/me/km/inventory/InventoryUtils.java

package me.km.inventory;

import net.minecraft.entity.passive.EntityVillager;
import net.minecraft.inventory.IInventory;
import net.minecraft.inventory.InventoryBasic;
import net.minecraft.item.Item;
import net.minecraft.item.ItemStack;

public class InventoryUtils
{       
    public static InventoryBasic getInventory(EntityVillager v)
    {
        EntityInventory real = new EntityInventory("Villager", 9, v);
        InventoryBasic old = v.getVillagerInventory();
        for(int i = 0; i < 9; i++)
        {
            real.setInventorySlotContents(i, old.getStackInSlot(i).copy());
        }
        return real;
    }
    
    public static void setInventory(EntityInventory inv)
    {
        if(inv.getEntity() instanceof EntityVillager)
        {
            EntityVillager v = (EntityVillager) inv.getEntity();
            InventoryBasic vInv = v.getVillagerInventory();
            for(int i = 0; i < 9; i++)
            {
                vInv.setInventorySlotContents(i, inv.getStackInSlot(i).copy());
            }
        }
    }
    
    public static boolean doItemStacksMatch(ItemStack first, ItemStack second)
    {
        int count = first.getCount();
        first.setCount(second.getCount());
        boolean b = ItemStack.areItemStacksEqual(first, second);
        first.setCount(count);
        return b;
    }

    public static int searchInventoryFor(IInventory inv, ItemStack searchfor, boolean useData)
    {
        int counter = 0;
        if(useData)
        {
            int size = inv.getSizeInventory();
            ItemStack stack;
            for(int i = 0; i < size; i++)
            {
                stack = inv.getStackInSlot(i);
                if(doItemStacksMatch(stack, searchfor))
                {
                    counter += stack.getCount();
                }
            }
        }
        else
        {
            int size = inv.getSizeInventory();
            Item item = searchfor.getItem();
            ItemStack stack;
            for(int i = 0; i < size; i++)
            {
                stack = inv.getStackInSlot(i);
                if(stack.getItem() == item)
                {
                    counter += stack.getCount();
                }
            }
        }
        return counter;
    }
    
    public static int removeFromInventory(IInventory inv, ItemStack searchfor)
    {
        ItemStack stack;
        int sub;
        int amount = searchfor.getCount();
        for(int i = 0; i < inv.getSizeInventory(); i++)
        {
            stack = inv.getStackInSlot(i);
            if(doItemStacksMatch(stack, searchfor))
            {
                sub = stack.getCount();
                if(amount > sub)
                {
                    amount -= sub;
                    inv.setInventorySlotContents(i, ItemStack.EMPTY);
                }
                else if(amount == sub)
                {
                    inv.setInventorySlotContents(i, ItemStack.EMPTY);
                    return 0;
                }
                else
                {
                    stack.setCount(sub - amount);
                    return 0;
                }
            }
        }
        return amount;
    }
}