Method updateItemStackNBT

src/main/java/net/minecraft/item/Item.java:121–124

Called when an ItemStack with NBT data is read to potentially that ItemStack's NBT data

(NBTTagCompound nbt)

     * Called when an ItemStack with NBT data is read to potentially that ItemStack's NBT data
     */
    public boolean updateItemStackNBT(NBTTagCompound nbt)
    {
        return false;
    }

    public Item setMaxStackSize(int maxStackSize)
    {