DiveListener

import java.util.logging.Logger;
public class DiveListener extends PluginListener {
    Logger log = Logger.getLogger("Minecraft");
    public boolean onCommand(Player player, String[] split) {
        if ((split[0].equalsIgnoreCase("/dive"))&&(player.canUseCommand("/dive")))
        {
          if (player.getItemInHand() == 20)
          {
            Item glass = player.getInventory().getItemFromId(20);
            int slot = glass.getSlot();
            int amt = glass.getAmount() - 1;
            if (player.getInventory().getItemFromSlot(39) != null){
                player.sendMessage("§4Your helmet slot is already filled");
                player.sendMessage("§2Make sure its empty and retry!");
                return true;
            }else{
            player.getInventory().setSlot(20, 1, 39);
            if (amt < 1){
              player.getInventory().removeItem(slot);
            }else {
              player.getInventory().setSlot(20, amt, slot);
            }
            player.getInventory().update();
            player.sendMessage("§eYou can now breathe underwater!");
            log.info("[Dive] " + player.getName() + " enabled a diving bell.");
            return true;
          }
          }

          player.sendMessage("§eHold a block of glass and try again...");

          return true;
        }
        return false;
      }
        public boolean onDamage(PluginLoader.DamageType type,BaseEntity attacker,BaseEntity defender,int amount){
            if (type == PluginLoader.DamageType.WATER){
                if (defender.isPlayer()){
                    Player player = defender.getPlayer();
                    Item item = player.getInventory().getItemFromSlot(39);
                    if (item == null){
                        return false;
                    }else{
                    if (item.getItemId() == 20){
                    return true;
                    }else{
                    return false;
                    }
                    }
                }
            }
            return false;
        }
    }