Method catchOnFire

src/main/java/net/minecraft/block/BlockFire.java:287–316

(World worldIn, BlockPos pos, int chance, Random random, int age)

    }

    private void catchOnFire(World worldIn, BlockPos pos, int chance, Random random, int age)
    {
        int i = this.getFlammability(worldIn.getBlockState(pos).getBlock());

        if (random.nextInt(chance) < i)
        {
            IBlockState iblockstate = worldIn.getBlockState(pos);

            if (random.nextInt(age + 10) < 5 && !worldIn.canLightningStrike(pos))
            {
                int j = age + random.nextInt(5) / 4;

                if (j > 15)
                {
                    j = 15;
                }

                worldIn.setBlockState(pos, this.getDefaultState().withProperty(AGE, j), 3);
            }
            else
            {
                worldIn.setBlockToAir(pos);
            }

            if (iblockstate.getBlock() == Blocks.tnt)
            {
                Blocks.tnt.onBlockDestroyedByPlayer(worldIn, pos, iblockstate.withProperty(BlockTNT.EXPLODE, Boolean.TRUE));
            }
        }
    }

    private boolean canNeighborCatchFire(World worldIn, BlockPos pos)
    {