function inventory(entity){
  var inv = entity.inventory;
  var result = {
    add: function(items){
      inv.addItem([items]);
      return result;
    },
    remove: function(items){
      inv.removeItem([items]);
      return result;
    },
    contains: function(items){
      return inv['contains(org.bukkit.inventory.ItemStack)'](items);
    }
  };
  return result;
}
module.exports = inventory;