Method onItemUse

src/main/java/net/minecraft/item/ItemFireball.java:24–54

Called when a Block is right-clicked with this Item @param pos The block being right-clicked @param side The side being right-clicked

(ItemStack stack, EntityPlayer playerIn, World worldIn, BlockPos pos, EnumFacing side, float hitX, float hitY, float hitZ)

     * @param side The side being right-clicked
     */
    public boolean onItemUse(ItemStack stack, EntityPlayer playerIn, World worldIn, BlockPos pos, EnumFacing side, float hitX, float hitY, float hitZ)
    {
        if (worldIn.isRemote)
        {
            return true;
        }
        else
        {
            pos = pos.offset(side);

            if (!playerIn.canPlayerEdit(pos, side, stack))
            {
                return false;
            }
            else
            {
                if (worldIn.getBlockState(pos).getBlock().getMaterial() == Material.air)
                {
                    worldIn.playSoundEffect((double)pos.getX() + 0.5D, (double)pos.getY() + 0.5D, (double)pos.getZ() + 0.5D, "item.fireCharge.use", 1.0F, (itemRand.nextFloat() - itemRand.nextFloat()) * 0.2F + 1.0F);
                    worldIn.setBlockState(pos, Blocks.fire.getDefaultState());
                }

                if (!playerIn.capabilities.isCreativeMode)
                {
                    --stack.stackSize;
                }

                return true;
            }
        }
    }
}