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    }