[Urgent] Inventory toggle system!

I have a plugin where you can Right_Click a Skeleton head and it fire arrows. But how can I make it so that if they have a FIRE (Id: 51) in their inventory the arrow turns to a flame arrow?
Code so far:

Code:

@EventHandler
public void onPlayerInteract11(PlayerInteractEvent event){
    final Player player = event.getPlayer();
    if(event.getAction().equals(Action.LEFT_CLICK_AIR)){
          int blockId = player.getItemInHand().getType().getId();
          int blockSubId = player.getItemInHand().getDurability();
          if (blockId == 397 && blockSubId == 0) {
              if(player.hasPermission("skeleton.fire")){
                  player.launchProjectile(Arrow.class);
                  player.playEffect(player.getLocation(), Effect.BOW_FIRE , 0);
              }
              }
          }
    }

 

Arrow a = player.launchProjectile(Arrow.class);
a.setFireTicks(SomeTickNumber)

 

Maybe this:

Code:

if(p.getInventory().contains(new ItemStack(Material.FIRE))){
   // Make the arrows turn into flame arrows, idk how to do that :P
}

 

Checks if the player's inventory contains a fire item:

Code:java

 
if (player.getInventory().contains(Material.FIRE)) {
Arrow arrow = player.launchProjectile(Arrow.class);
arrow.setFireTicks(1000);
 
}
 

 

Thanks =D