Check For Armor

I am trying to check if a player has a full set of a certain type of armor and give them a certain potion effect based on the type they are wearing. Here is my code so far but it does not seem to work. The plugin loads in the server and does not throw any errors but nothing happens when I put a full set of armor on.

Code:

@EventHandler
    public void onInventoryEdit(InventoryInteractEvent event){
        Player player = (Player) event.getWhoClicked();
        PlayerInventory inv = event.getWhoClicked().getInventory();
        if(inv.getHelmet() == new ItemStack(Material.LEATHER_HELMET,1) &&inv.getChestplate() ==new ItemStack(Material.LEATHER_CHESTPLATE,1)&&
                inv.getLeggings() == new ItemStack(Material.LEATHER_LEGGINGS,1)&&inv.getBoots() == new ItemStack(Material.LEATHER_BOOTS,1)){
            player.addPotionEffect(new PotionEffect(PotionEffectType.SPEED, 100000, 2));
}

 

@zakarls This is the first time i see this event used.
I'm not sure this is the best way to do it. You should check InventoryClickEvent and the slot clicked, for see if the armor is modified. And be carreful, armor can be null.

note: When u check itemstack like that, the name, the description, the durability affect.

 

@caderape
What if I want it to check for the itemstack but the durability doesnt matter