InventoryUtils.java

package imdutch21.oilcraft.util;

import net.minecraft.inventory.IInventory;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.nbt.NBTTagList;
import net.minecraftforge.common.util.Constants;

/**
 * Created by Bart on 12/02/2016.
 */
public class InventoryUtils {

    public static void saveInventory(NBTTagCompound compound, IInventory inventory) {
        NBTTagList items = new NBTTagList();

        for (int i = 0; i < inventory.getSizeInventory(); i++) {
            ItemStack stack = inventory.getStackInSlot(i);

            if (stack != null) {
                NBTTagCompound item = new NBTTagCompound();
                item.setByte("Slot", (byte) i);
                stack.writeToNBT(item);
                items.appendTag(item);
            }
        }

        compound.setTag("Items", items);
    }

    public static void loadInventory(NBTTagCompound compound, IInventory inventory) {
        NBTTagList items = compound.getTagList("Items", Constants.NBT.TAG_COMPOUND);

        for (int i = 0; items.tagCount() > i; i++) {
            NBTTagCompound item = items.getCompoundTagAt(i);
            int slot = item.getByte("Slot");

            if (slot >= 0 && slot < inventory.getSizeInventory()) {
                inventory.setInventorySlotContents(slot, ItemStack.loadItemStackFromNBT(item));
            }
        }
    }
}