How to make chain armor unbreakable...

I created a plugin to buff chain armor (It worked) yet it kills the durability. How could I make only chain armor unbreakable?

 

EntityDamageEvent, get if it's a player, get his armour contents, and per item check if it's chain, and repair it.

 

Code:

package de.Cammeritz.DevHelp;
 
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.entity.EntityDamageEvent;
import org.bukkit.inventory.ItemStack;
 
public class UnlimitedChain {
 
    @EventHandler
    public void onChain(EntityDamageEvent ev) {
        if(!(ev.getEntity() instanceof Player)) {
            return;
        }
       
        Player p = (Player) ev.getEntity();
       
        for(ItemStack i : p.getEquipment().getArmorContents()) {
            if(!( i.getType() == Material.CHAINMAIL_BOOTS || i.getType() == Material.CHAINMAIL_CHESTPLATE || i.getType() == Material.CHAINMAIL_HELMET || i.getType() == Material.CHAINMAIL_LEGGINGS )) {
                continue;
            }
           
            short durability = 0;
           
            i.setDurability(durability);
           
        }
       
        return;
    }
   
}

I hope it helped u