private static final Map<ResourceLocation, Supplier<BiFunction<InventoryPlayer, BlockPos, GuiScreen>>> GUISUPPLIERS = new HashMap<>();

    public static void registerGuiScreens()
    {
        registerGui("crate_gui", () -> (playerInv, pos) -> new GuiCrate(new ContainerCrate(playerInv, (TileEntityCrate)playerInv.player.world.getTileEntity(pos)), playerInv));
        registerGui("large_chest_gui", () -> (playerInv, pos) -> new GuiLargeChest(new ContainerLargeChest(playerInv, (TileEntityLargeChest)playerInv.player.world.getTileEntity(pos)), playerInv));
        registerGui("carpenters_table_gui", () -> (playerInv, pos) -> new GuiCarpentersTable(playerInv, playerInv.player.world, pos));
        registerGui("bookshelf_cabinet_gui", () -> (playerInv, pos) -> new GuiBookshelf(new ContainerBookshelfCabinet(playerInv, (TileEntityBookshelf.Cabinet)playerInv.player.world.getTileEntity(pos)), playerInv));
    }

    private static void registerGui(String id, Supplier<BiFunction<InventoryPlayer, BlockPos, GuiScreen>> returnSupplier)
    {
        ResourceLocation resourceId = new ResourceLocation(Constants.MODID, id);

        if (!GUISUPPLIERS.containsKey(resourceId))
        {
            GUISUPPLIERS.put(resourceId, returnSupplier);
        }
        else
        {
            MinecraftExtended.LOGGER.error("Tried to register GuiScreen Supplier multiple times.");
        }
    }

    public static GuiScreen handleGuiRequest(FMLPlayMessages.OpenContainer openContainer)
    {
        ResourceLocation id = openContainer.getId();

        if (GUISUPPLIERS.containsKey(id))
        {
            Supplier<BiFunction<InventoryPlayer, BlockPos, GuiScreen>> returnSupplier = GUISUPPLIERS.get(id);
            EntityPlayerSP player = Minecraft.getInstance().player;
            BlockPos pos = openContainer.getAdditionalData().readBlockPos();

            if (returnSupplier != null && returnSupplier.get() != null)
            {
                return returnSupplier.get().apply(player.inventory, pos);
            }
        }

        return null;
    }