My Container

package me.misterfrogger.quintuplinator.client;

import me.misterfrogger.quintuplinator.SlotRestricted;
import me.misterfrogger.quintuplinator.TileEntityPurificationChamber;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.entity.player.InventoryPlayer;
import net.minecraft.inventory.Container;
import net.minecraft.inventory.Slot;
import net.minecraft.item.ItemStack;

public class ContainerPurificationChamber extends Container {
    private TileEntityPurificationChamber te;

    public ContainerPurificationChamber(InventoryPlayer player, TileEntityPurificationChamber entity){
        this.te = entity;

        for(int x = 0;x < 9;x++){
            addSlotToContainer(new Slot(player, x, 8 + x * 18, 142));
        }

        for(int y = 0;y < 3;y++){
            for(int x = 0;x < 9;x++){
                addSlotToContainer(new Slot(player, 9 + x + y * 9, 8 + x * 18, 84 + y * 18));
            }
        }

        addSlotToContainer(new Slot(te, 0, 56, 35));
        addSlotToContainer(new SlotRestricted(te, 1, 116, 35));
    }

    @Override
    public boolean canInteractWith(EntityPlayer player){
        return te.isUseableByPlayer(player);
    }

    @Override
    public ItemStack transferStackInSlot(EntityPlayer player, int i){
        if(te.worldObj.isRemote) return null;
        Slot slot = getSlot(i);

        if(slot != null && slot.getHasStack()){
            ItemStack stack = slot.getStack();
            ItemStack result = stack.copy();

            if(i >= 36){
                if(!mergeItemStack(stack, 0, 36, false)){
                    return null;
                }
            }else if(!mergeItemStack(stack, 36, 36 + te.getSizeInventory(), false)){
                return null;
            }

            if(stack.stackSize == 0){
                slot.putStack(null);
            }else{
                slot.onSlotChanged();
            }

            slot.onPickupFromSlot(player, stack);
            te.onInventoryChanged();
            return result;
        }

        return null;
    }
}