Check for Enchantment on Entity Trident

How can I check to see if a thrown Trident projectile has an enchantment? In my minigame, I want to Tridents without the loyalty enchantment to be removed on hit, but not the ones with the Loyalty enchantment.

Thanks,
Smeary

 

The way I'd do it would be to create a NamespacedKey in the class then listen to ProjectileLaunchEvent. Check if the projectile is a trident; if not, return. Then I'd get the Player from the projectile's getShooter() and grab the item from their hand. If the ItemMeta doesn't have the loyalty enchant, return. Then lastly apply the NamespacedKey to the projectile's PersistentDataContainer (NOT to the item in hand!).

Then listen to ProjectileHitEvent. If it doesn't have the key, return. Then after that just call remove on the projectile.

 

How do NamespacedKeys work? I've tried to figure it out and look it up in the java docs but honestly I just can't grasp them.

 

To make a key, you pass it an instance of your main class and a name. Then you can use the PersistentDataContainer#has method to check if it exists. You pass has the key and the data type you used when setting. So for the trident example, if it was all in the main class it'd be something like

Code:

class {
  private NamespacedKey wipeTrident = new NamespacedKey(this, "wipeTrident");

  @EventHandler
  public void onLaunch(ProjectileLaunchEvent e) {
   if (e.getEntity().getType() != EntityType.TRIDENT) return;
   if (!(e.getEntity().getShooter() instanceof Player)) return;

   Player p = (Player)e.getEntity().getShooter();
   ItemStack i = p.getInventory().getItemInMainHand();
   ItemMeta im = i.getItemMeta();
    if (im.hasEnchant(Enchantment.LOYALTY)) return;

    e.getEntity().getPersistentDataContainer().set(wipeTrident, PersistentDataType.INTEGER, 1);
  }

  @EventHandler
  public void onHit(ProjectileHitEvent e) {
    Projectile pj = e.getEntity();
    if (!pj.getPersistentDataContainer().has(wipeTrident, PersistentDataType.INTEGER)) return;

    pj.remove();
  }
}

So in the example, I first setup the key object then in the launch once I know it's a trident I wish to be disappeared upon landing, I apply the key with an int value of 1. The value is irrelevant, just something. Doesn't have to be int either. Then when the projectile hits, I check if it has that key set. If so, remove.

That's basically it. Pretty straight forward.