Solved Need help with checking for custom item meta

So I am making a plugin for my friend, where if he has a cake, it explodes when it is placed, but I don't want EVERY cake ever placed down to blow up, so I made a custom item meta, but how would I make it so that instead of the cake getting placed down and blowing up, the custom item meta cake gets placed down and blown up?
my code:

Code:java

     @EventHandler
    public void onPlayerInteractBlock(PlayerInteractEvent event) {
        Player player = event.getPlayer();
        if (player.getItemInHand().getType() == Material.CAKE)
            player.getWorld().playSound(player.getLocation(), Sound.ENDERDRAGON_DEATH, 1F, 1F);
            player.sendMessage(ChatColor.GOLD + "" + ChatColor.BOLD + "Uh-oh! Someone has used an over powered birthday cake!");
            player.getWorld().createExplosion(player.getLocation(), 10.0F);
        }

Creating the custom item meta:

Code:

                ItemStack gold = new ItemStack(Material.CAKE);
                ItemMeta ca = gold.getItemMeta();
                ca.setDisplayName(ChatColor.GOLD + "" + ChatColor.BOLD + "Birthday Cake");
                List<String> lore = new ArrayList<String>();
                lore.add(ChatColor.DARK_AQUA + "Happy Birthday Alex! Your 12! You managed to survive that long! Congrats!");
                ca.setLore(lore);
                gold.setItemMeta(ca);

Any help?

Woops, I pasted the code for my event after I tried something, let me fix that.

EDIT by Moderator: merged posts, please use the edit button instead of double posting.