ItemCraftedEvent Issues

public class EventItemCrafted 
{
	@SubscribeEvent
	public void onItemCrafted(ItemCraftedEvent event)
	{
		ItemStack stack = event.crafting;
		NBTTagCompound nbt = stack.getTagCompound();

		if (stack.getItem() instanceof ItemSword)
		{
			if (nbt == null)
			{				
				nbt = new NBTTagCompound();
				stack.setTagCompound(nbt);

				boolean developmentEnvironment = (Boolean)Launch.blackboard.get("fml.deobfuscatedEnvironment");
				
				if (developmentEnvironment || ConfigHandler.enableDevFeatures)
				{
					RandomCollection<String> rarities = new RandomCollection<String>();
					
					rarities.add(0.65D, "basic");
					rarities.add(0.17D, "uncommon");
					rarities.add(0.11D, "rare");
					rarities.add(0.05D, "legendary");
					rarities.add(0.02D, "ancient");
					String rarity = rarities.next();
					LogHelper.info(rarity);
					
					if (rarity == "basic") nbt.setInteger("RARITY", 1);
					if (rarity == "uncommon") nbt.setInteger("RARITY", 2);
					if (rarity == "rare") nbt.setInteger("RARITY", 3);
					if (rarity == "legendary") nbt.setInteger("RARITY", 4);
					if (rarity == "ancient") nbt.setInteger("RARITY", 5);
				}
			}
		}
	}
}