package com.hbm.inventory; import com.hbm.items.machine.ItemMachineUpgrade; import net.minecraft.inventory.IInventory; import net.minecraft.inventory.Slot; import net.minecraft.item.ItemStack; public class SlotUpgrade extends Slot { public SlotUpgrade(IInventory inventory, int i, int j, int k) { super(inventory, i, j, k); } @Override public boolean isItemValid(ItemStack stack) { return stack != null && stack.getItem() instanceof ItemMachineUpgrade; } @Override public void onSlotChange(ItemStack sta1, ItemStack sta2) { super.onSlotChange(sta1, sta2); } }