getItems Method

public static ItemStack getDropsWithTool(Block b, Player p) throws Exception {

        net.minecraft.server.v1_9_R1.Chunk nmsChunk = ((CraftChunk) b.getChunk()).getHandle();
        BlockPosition blockPosition = new BlockPosition(b.getX(), b.getY(), b.getZ());
        net.minecraft.server.v1_9_R1.Block nmsBlock = CraftMagicNumbers.getBlock(b);

        net.minecraft.server.v1_9_R1.ItemStack itemstack = CraftItemStack.asNMSCopy(p.getInventory().getItemInMainHand());
        IBlockData iblockdata = nmsChunk.getBlockData(blockPosition);

        Method blockStateCheck = net.minecraft.server.v1_9_R1.Block.class.getDeclaredMethod("o");
        blockStateCheck.setAccessible(true);

        if (((Boolean) blockStateCheck.invoke(nmsBlock)) && EnchantmentManager.getEnchantmentLevel(Enchantments.SILK_TOUCH, itemstack) > 0) {

            //noinspection unchecked
            Method getSilkedMethod = net.minecraft.server.v1_9_R1.Block.class.getDeclaredMethod("u", IBlockData.class);
            getSilkedMethod.setAccessible(true);

            net.minecraft.server.v1_9_R1.ItemStack i1 = (net.minecraft.server.v1_9_R1.ItemStack) getSilkedMethod.invoke(nmsBlock, iblockdata);
            if (i1 != null) {
                return CraftItemStack.asBukkitCopy(i1);
            }
        } else {
            int i = EnchantmentManager.getEnchantmentLevel(Enchantments.LOOT_BONUS_BLOCKS, itemstack);

            net.minecraft.server.v1_9_R1.World world = nmsChunk.getWorld();
            ItemStack item = null;

            if (!world.isClientSide) {
                int j = nmsBlock.getDropCount(i, world.random);

                for (int k = 0; k < j; ++k) {
                    if (world.random.nextFloat() < 1.0F) {
                        Item temp = nmsBlock.getDropType(iblockdata, world.random, i);
                        if (temp != null) {
                            if (item == null) {
                                item = CraftItemStack.asBukkitCopy(new net.minecraft.server.v1_9_R1.ItemStack(temp, 1, nmsBlock.getDropData(iblockdata)));
                            } else {
                                item.setAmount(item.getAmount() + 1);
                            }
                        }
                    }
                }

                return (item != null ? (item.getAmount() > 0 ? item : null) : null);
            }

        }

        return null;
    }