InputStackHandler

public class InputStackHandler extends ItemStackHandler {

    private final ItemStackHandler internalSlot;

    public InputStackHandler(ItemStackHandler hidden) {

        super();
        internalSlot = hidden;

    }

    @Override
    public ItemStack insertItem(int slot, ItemStack stack, boolean simulate) {

        return internalSlot.insertItem(slot, stack, simulate);

    }

    @Override
    public ItemStack extractItem(int slot, int amount, boolean simulate) {

        return ItemStack.EMPTY;

    }
}