1.6.4 to 1.7.2 update question| blocksList => BlockRegistry?

Hey guys,

my code is :

{

        EntityPlayer player;

        if (entity instanceof EntityPlayer)

            player = (EntityPlayer) entity;

        else

            return false;

        //Block b = Block.blocksList[blockID];

        if (b != null)

        {

            if (b.isLeaves(world, x, y, z))

                return recurseLeaves(stack, world, x, y, z, player);

            if (b instanceof BlockFlower)

                return recurseCrops(stack, world, x, y, z, player);

        }

        return super.onBlockDestroyed(stack, world, Block, x, y, z, entity);

    }

How I have to write the code in 1.7.2 ? I've edited some stuff already, but there is a problem with the BlackList. I heared that is renamed BlockRegistry. But how I've to do it? Please help me with a little code example

Best regards,

SantacreeperLP