    001    package net.minecraft.entity;
    002
    003    import net.minecraft.entity.player.EntityPlayer;
    004    import net.minecraft.item.Item;
    005    import net.minecraft.item.ItemStack;
    006    import net.minecraft.nbt.NBTTagCompound;
    007    import net.minecraft.world.World;
    008
    009    public abstract class EntityAgeable extends EntityCreature
    010    {
    011        public EntityAgeable(World par1World)
    012        {
    013            super(par1World);
    014        }
    015
    016        public abstract EntityAgeable func_90011_a(EntityAgeable var1);
    017
    018        /**
    019         * Called when a player interacts with a mob. e.g. gets milk from a cow, gets into the saddle on a pig.
    020         */
    021        public boolean interact(EntityPlayer par1EntityPlayer)
    022        {
    023            ItemStack var2 = par1EntityPlayer.inventory.getCurrentItem();
    024
    025            if (var2 != null && var2.itemID == Item.monsterPlacer.shiftedIndex && !this.worldObj.isRemote)
    026            {
    027                Class var3 = EntityList.func_90035_a(var2.getItemDamage());
    028
    029                if (var3 != null && var3.isAssignableFrom(this.getClass()))
    030                {
    031                    EntityAgeable var4 = this.func_90011_a(this);
    032
    033                    if (var4 != null)
    034                    {
    035                        var4.setGrowingAge(-24000);
    036                        var4.setLocationAndAngles(this.posX, this.posY, this.posZ, 0.0F, 0.0F);
    037                        this.worldObj.spawnEntityInWorld(var4);
    038                    }
    039                }
    040            }
    041
    042            return super.interact(par1EntityPlayer);
    043        }
    044
    045        protected void entityInit()
    046        {
    047            super.entityInit();
    048            this.dataWatcher.addObject(12, new Integer(0));
    049        }
    050
    051        /**
    052         * The age value may be negative or positive or zero. If it's negative, it get's incremented on each tick, if it's
    053         * positive, it get's decremented each tick. Don't confuse this with EntityLiving.getAge. With a negative value the
    054         * Entity is considered a child.
    055         */
    056        public int getGrowingAge()
    057        {
    058            return this.dataWatcher.getWatchableObjectInt(12);
    059        }
    060
    061        /**
    062         * The age value may be negative or positive or zero. If it's negative, it get's incremented on each tick, if it's
    063         * positive, it get's decremented each tick. With a negative value the Entity is considered a child.
    064         */
    065        public void setGrowingAge(int par1)
    066        {
    067            this.dataWatcher.updateObject(12, Integer.valueOf(par1));
    068        }
    069
    070        /**
    071         * (abstract) Protected helper method to write subclass entity data to NBT.
    072         */
    073        public void writeEntityToNBT(NBTTagCompound par1NBTTagCompound)
    074        {
    075            super.writeEntityToNBT(par1NBTTagCompound);
    076            par1NBTTagCompound.setInteger("Age", this.getGrowingAge());
    077        }
    078
    079        /**
    080         * (abstract) Protected helper method to read subclass entity data from NBT.
    081         */
    082        public void readEntityFromNBT(NBTTagCompound par1NBTTagCompound)
    083        {
    084            super.readEntityFromNBT(par1NBTTagCompound);
    085            this.setGrowingAge(par1NBTTagCompound.getInteger("Age"));
    086        }
    087
    088        /**
    089         * Called frequently so the entity can update its state every tick as required. For example, zombies and skeletons
    090         * use this to react to sunlight and start to burn.
    091         */
    092        public void onLivingUpdate()
    093        {
    094            super.onLivingUpdate();
    095            int var1 = this.getGrowingAge();
    096
    097            if (var1 < 0)
    098            {
    099                ++var1;
    100                this.setGrowingAge(var1);
    101            }
    102            else if (var1 > 0)
    103            {
    104                --var1;
    105                this.setGrowingAge(var1);
    106            }
    107        }
    108
    109        /**
    110         * If Animal, checks if the age timer is negative
    111         */
    112        public boolean isChild()
    113        {
    114            return this.getGrowingAge() < 0;
    115        }
    116    }