How to get block face on item use?

What I have right now is:

 public boolean onItemUse(ItemStack itemStack, EntityPlayer player, World world, int x, int y, int z, int side, float px, float py, float pz)
    {
        if (world.getBlock(x, y + 1, z) == Blocks.air)
        {
              world.setBlock(x, y + 1, z, Blocks.water);
              
              
              return true;
        }
        return false;
    }

But I want it so if a player clicks on the top of the block it will spawn at y +1 water,

if they click on the bottom, y -1 cobblestone

etc. (as an example)

Any ideas how to get the face of block clicked on?