Anvil Event cancelation

So I'm working on a mod and it is a RPG based so there are a ton of weapons and as such they need a repairable item so i added on in, however the problem I'm facing is that i don't want people to just go and rename the weapon or items whenever. what line do i need in order to prevent this? while while the weapon is being repaired and not repaired, so just in general to not allow it to specifically get its name changed?

package com.phantasyrealms.item;

import java.util.List;

import net.minecraft.entity.player.EntityPlayer;

import net.minecraft.item.ItemStack;

import net.minecraft.item.ItemSword;

public class Brand extends ItemSword{

public Brand(ToolMaterial p_i45356_1_) {

super(p_i45356_1_);

// TODO Auto-generated constructor stub

}

    public void addInformation(ItemStack par1ItemStack, EntityPlayer par2EntityPlayer, List par3List, boolean par4)

    {

    par3List.add("§oBasic");

    }

    @Override

    public boolean getIsRepairable(ItemStack par1ItemStack, ItemStack par2ItemStack){

    return PhantasyRealmsItems.photondrop == par2ItemStack.getItem() ? true : super.getIsRepairable(par1ItemStack, par2ItemStack);

    }

}