    001    package net.minecraft.src;
    002
    003    public class ItemMapBase extends Item
    004    {
    005        protected ItemMapBase(int par1)
    006        {
    007            super(par1);
    008        }
    009
    010        /**
    011         * false for all Items except sub-classes of ItemMapBase
    012         */
    013        public boolean isMap()
    014        {
    015            return true;
    016        }
    017
    018        /**
    019         * returns null if no update is to be sent
    020         */
    021        public Packet createMapDataPacket(ItemStack par1ItemStack, World par2World, EntityPlayer par3EntityPlayer)
    022        {
    023            return null;
    024        }
    025    }