Removing and Replacing items in a player's hand.

Hello, I was wondering if anyone could help me. I want to know how i can make my plugin remove an item from a player's hand and replace it with another item of the same amount on a command. For example if they had 13 iron ore I want the player to be able to type /smelt and the iron ore will be removed and replaced with 13 iron ingots. Any help would be appreciated.

Thank you.

 

Use:

Code:

                if(player.getItemInHand().getType() == Material.IRON_ORE) {
ItemStack iron = player.getInventory().getItemInHand();
            //or this for a special slot (1 is the slot)
            //ItemStack iron = player.getInventory().getItem(1);
            int amount = iron.getAmount();
            ItemStack smelt = new ItemStack(Material.IRON_INGOT, amount);
            player.getInventory().setItemInHand(smelt);
            //or slot again (1 is slot) 0 is the first slot in his inventory if closed
            //player.getInventory().setItem(1, smelt);
}

 

Since I'm going to make it work for all ores and food would I create multiple if statements or could I use a switch statement?