    001package net.minecraft.entity.item;
    002
    003import java.util.Iterator;
    004
    005import net.minecraftforge.common.MinecraftForge;
    006import net.minecraftforge.event.Event.Result;
    007import net.minecraftforge.event.entity.item.ItemExpireEvent;
    008import net.minecraftforge.event.entity.player.EntityItemPickupEvent;
    009
    010import cpw.mods.fml.common.registry.GameRegistry;
    011import net.minecraft.block.Block;
    012import net.minecraft.block.material.Material;
    013import net.minecraft.entity.Entity;
    014import net.minecraft.entity.player.EntityPlayer;
    015import net.minecraft.item.Item;
    016import net.minecraft.item.ItemStack;
    017import net.minecraft.nbt.NBTTagCompound;
    018import net.minecraft.stats.AchievementList;
    019import net.minecraft.util.DamageSource;
    020import net.minecraft.util.MathHelper;
    021import net.minecraft.util.StatCollector;
    022import net.minecraft.world.World;
    023
    024public class EntityItem extends Entity
    025{
    026    /**
    027     * The age of this EntityItem (used to animate it up and down as well as expire it)
    028     */
    029    public int age;
    030    public int delayBeforeCanPickup;
    031
    032    /** The health of this EntityItem. (For example, damage for tools) */
    033    private int health;
    034
    035    /** The EntityItem's random initial float height. */
    036    public float hoverStart;
    037
    038    /**
    039     * The maximum age of this EntityItem.  The item is expired once this is reached.
    040     */
    041    public int lifespan = 6000;
    042
    043    public EntityItem(World par1World, double par2, double par4, double par6)
    044    {
    045        super(par1World);
    046        this.age = 0;
    047        this.health = 5;
    048        this.hoverStart = (float)(Math.random() * Math.PI * 2.0D);
    049        this.setSize(0.25F, 0.25F);
    050        this.yOffset = this.height / 2.0F;
    051        this.setPosition(par2, par4, par6);
    052        this.rotationYaw = (float)(Math.random() * 360.0D);
    053        this.motionX = (double)((float)(Math.random() * 0.20000000298023224D - 0.10000000149011612D));
    054        this.motionY = 0.20000000298023224D;
    055        this.motionZ = (double)((float)(Math.random() * 0.20000000298023224D - 0.10000000149011612D));
    056    }
    057
    058    public EntityItem(World par1World, double par2, double par4, double par6, ItemStack par8ItemStack)
    059    {
    060        this(par1World, par2, par4, par6);
    061        this.setEntityItemStack(par8ItemStack);
    062        this.lifespan = (par8ItemStack.getItem() == null ? 6000 : par8ItemStack.getItem().getEntityLifespan(par8ItemStack, par1World));
    063    }
    064
    065    /**
    066     * returns if this entity triggers Block.onEntityWalking on the blocks they walk on. used for spiders and wolves to
    067     * prevent them from trampling crops
    068     */
    069    protected boolean canTriggerWalking()
    070    {
    071        return false;
    072    }
    073
    074    public EntityItem(World par1World)
    075    {
    076        super(par1World);
    077        this.age = 0;
    078        this.health = 5;
    079        this.hoverStart = (float)(Math.random() * Math.PI * 2.0D);
    080        this.setSize(0.25F, 0.25F);
    081        this.yOffset = this.height / 2.0F;
    082    }
    083
    084    protected void entityInit()
    085    {
    086        this.getDataWatcher().addObjectByDataType(10, 5);
    087    }
    088
    089    /**
    090     * Called to update the entity's position/logic.
    091     */
    092    public void onUpdate()
    093    {
    094        ItemStack stack = this.getDataWatcher().getWatchableObjectItemStack(10);
    095        if (stack != null && stack.getItem() != null)
    096        {
    097            if (stack.getItem().onEntityItemUpdate(this))
    098            {
    099                return;
    100            }
    101        }
    102
    103        super.onUpdate();
    104
    105        if (this.delayBeforeCanPickup > 0)
    106        {
    107            --this.delayBeforeCanPickup;
    108        }
    109
    110        this.prevPosX = this.posX;
    111        this.prevPosY = this.posY;
    112        this.prevPosZ = this.posZ;
    113        this.motionY -= 0.03999999910593033D;
    114        this.noClip = this.pushOutOfBlocks(this.posX, (this.boundingBox.minY + this.boundingBox.maxY) / 2.0D, this.posZ);
    115        this.moveEntity(this.motionX, this.motionY, this.motionZ);
    116        boolean flag = (int)this.prevPosX != (int)this.posX || (int)this.prevPosY != (int)this.posY || (int)this.prevPosZ != (int)this.posZ;
    117
    118        if (flag || this.ticksExisted % 25 == 0)
    119        {
    120            if (this.worldObj.getBlockMaterial(MathHelper.floor_double(this.posX), MathHelper.floor_double(this.posY), MathHelper.floor_double(this.posZ)) == Material.lava)
    121            {
    122                this.motionY = 0.20000000298023224D;
    123                this.motionX = (double)((this.rand.nextFloat() - this.rand.nextFloat()) * 0.2F);
    124                this.motionZ = (double)((this.rand.nextFloat() - this.rand.nextFloat()) * 0.2F);
    125                this.playSound("random.fizz", 0.4F, 2.0F + this.rand.nextFloat() * 0.4F);
    126            }
    127
    128            if (!this.worldObj.isRemote)
    129            {
    130                this.searchForOtherItemsNearby();
    131            }
    132        }
    133
    134        float f = 0.98F;
    135
    136        if (this.onGround)
    137        {
    138            f = 0.58800006F;
    139            int i = this.worldObj.getBlockId(MathHelper.floor_double(this.posX), MathHelper.floor_double(this.boundingBox.minY) - 1, MathHelper.floor_double(this.posZ));
    140
    141            if (i > 0)
    142            {
    143                f = Block.blocksList[i].slipperiness * 0.98F;
    144            }
    145        }
    146
    147        this.motionX *= (double)f;
    148        this.motionY *= 0.9800000190734863D;
    149        this.motionZ *= (double)f;
    150
    151        if (this.onGround)
    152        {
    153            this.motionY *= -0.5D;
    154        }
    155
    156        ++this.age;
    157
    158        ItemStack item = getDataWatcher().getWatchableObjectItemStack(10);
    159
    160        if (!this.worldObj.isRemote && this.age >= lifespan)
    161        {
    162            if (item != null)
    163            {
    164                ItemExpireEvent event = new ItemExpireEvent(this, (item.getItem() == null ? 6000 : item.getItem().getEntityLifespan(item, worldObj)));
    165                if (MinecraftForge.EVENT_BUS.post(event))
    166                {
    167                    lifespan += event.extraLife;
    168                }
    169                else
    170                {
    171                    this.setDead();
    172                }
    173            }
    174            else
    175            {
    176                this.setDead();
    177            }
    178        }
    179
    180        if (item != null && item.stackSize <= 0)
    181        {
    182            this.setDead();
    183        }
    184    }
    185
    186    /**
    187     * Looks for other itemstacks nearby and tries to stack them together
    188     */
    189    private void searchForOtherItemsNearby()
    190    {
    191        Iterator iterator = this.worldObj.getEntitiesWithinAABB(EntityItem.class, this.boundingBox.expand(0.5D, 0.0D, 0.5D)).iterator();
    192
    193        while (iterator.hasNext())
    194        {
    195            EntityItem entityitem = (EntityItem)iterator.next();
    196            this.combineItems(entityitem);
    197        }
    198    }
    199
    200    /**
    201     * Tries to merge this item with the item passed as the parameter. Returns true if successful. Either this item or
    202     * the other item will  be removed from the world.
    203     */
    204    public boolean combineItems(EntityItem par1EntityItem)
    205    {
    206        if (par1EntityItem == this)
    207        {
    208            return false;
    209        }
    210        else if (par1EntityItem.isEntityAlive() && this.isEntityAlive())
    211        {
    212            ItemStack itemstack = this.getEntityItem();
    213            ItemStack itemstack1 = par1EntityItem.getEntityItem();
    214
    215            if (itemstack1.getItem() != itemstack.getItem())
    216            {
    217                return false;
    218            }
    219            else if (itemstack1.hasTagCompound() ^ itemstack.hasTagCompound())
    220            {
    221                return false;
    222            }
    223            else if (itemstack1.hasTagCompound() && !itemstack1.getTagCompound().equals(itemstack.getTagCompound()))
    224            {
    225                return false;
    226            }
    227            else if (itemstack1.getItem().getHasSubtypes() && itemstack1.getItemDamage() != itemstack.getItemDamage())
    228            {
    229                return false;
    230            }
    231            else if (itemstack1.stackSize < itemstack.stackSize)
    232            {
    233                return par1EntityItem.combineItems(this);
    234            }
    235            else if (itemstack1.stackSize + itemstack.stackSize > itemstack1.getMaxStackSize())
    236            {
    237                return false;
    238            }
    239            else
    240            {
    241                itemstack1.stackSize += itemstack.stackSize;
    242                par1EntityItem.delayBeforeCanPickup = Math.max(par1EntityItem.delayBeforeCanPickup, this.delayBeforeCanPickup);
    243                par1EntityItem.age = Math.min(par1EntityItem.age, this.age);
    244                par1EntityItem.setEntityItemStack(itemstack1);
    245                this.setDead();
    246                return true;
    247            }
    248        }
    249        else
    250        {
    251            return false;
    252        }
    253    }
    254
    255    /**
    256     * sets the age of the item so that it'll despawn one minute after it has been dropped (instead of five). Used when
    257     * items are dropped from players in creative mode
    258     */
    259    public void setAgeToCreativeDespawnTime()
    260    {
    261        this.age = 4800;
    262    }
    263
    264    /**
    265     * Returns if this entity is in water and will end up adding the waters velocity to the entity
    266     */
    267    public boolean handleWaterMovement()
    268    {
    269        return this.worldObj.handleMaterialAcceleration(this.boundingBox, Material.water, this);
    270    }
    271
    272    /**
    273     * Will deal the specified amount of damage to the entity if the entity isn't immune to fire damage. Args:
    274     * amountDamage
    275     */
    276    protected void dealFireDamage(int par1)
    277    {
    278        this.attackEntityFrom(DamageSource.inFire, par1);
    279    }
    280
    281    /**
    282     * Called when the entity is attacked.
    283     */
    284    public boolean attackEntityFrom(DamageSource par1DamageSource, int par2)
    285    {
    286        if (this.isEntityInvulnerable())
    287        {
    288            return false;
    289        }
    290        else if (this.getEntityItem() != null && this.getEntityItem().itemID == Item.netherStar.itemID && par1DamageSource.isExplosion())
    291        {
    292            return false;
    293        }
    294        else
    295        {
    296            this.setBeenAttacked();
    297            this.health -= par2;
    298
    299            if (this.health <= 0)
    300            {
    301                this.setDead();
    302            }
    303
    304            return false;
    305        }
    306    }
    307
    308    /**
    309     * (abstract) Protected helper method to write subclass entity data to NBT.
    310     */
    311    public void writeEntityToNBT(NBTTagCompound par1NBTTagCompound)
    312    {
    313        par1NBTTagCompound.setShort("Health", (short)((byte)this.health));
    314        par1NBTTagCompound.setShort("Age", (short)this.age);
    315        par1NBTTagCompound.setInteger("Lifespan", lifespan);
    316
    317        if (this.getEntityItem() != null)
    318        {
    319            par1NBTTagCompound.setCompoundTag("Item", this.getEntityItem().writeToNBT(new NBTTagCompound()));
    320        }
    321    }
    322
    323    /**
    324     * (abstract) Protected helper method to read subclass entity data from NBT.
    325     */
    326    public void readEntityFromNBT(NBTTagCompound par1NBTTagCompound)
    327    {
    328        this.health = par1NBTTagCompound.getShort("Health") & 255;
    329        this.age = par1NBTTagCompound.getShort("Age");
    330        NBTTagCompound nbttagcompound1 = par1NBTTagCompound.getCompoundTag("Item");
    331        this.setEntityItemStack(ItemStack.loadItemStackFromNBT(nbttagcompound1));
    332
    333        ItemStack item = getDataWatcher().getWatchableObjectItemStack(10);
    334
    335        if (item == null || item.stackSize <= 0)
    336        {
    337            this.setDead();
    338        }
    339
    340        if (par1NBTTagCompound.hasKey("Lifespan"))
    341        {
    342            lifespan = par1NBTTagCompound.getInteger("Lifespan");
    343        }
    344    }
    345
    346    /**
    347     * Called by a player entity when they collide with an entity
    348     */
    349    public void onCollideWithPlayer(EntityPlayer par1EntityPlayer)
    350    {
    351        if (!this.worldObj.isRemote)
    352        {
    353            if (this.delayBeforeCanPickup > 0)
    354            {
    355                return;
    356            }
    357
    358            EntityItemPickupEvent event = new EntityItemPickupEvent(par1EntityPlayer, this);
    359
    360            if (MinecraftForge.EVENT_BUS.post(event))
    361            {
    362                return;
    363            }
    364
    365            ItemStack itemstack = this.getEntityItem();
    366            int i = itemstack.stackSize;
    367
    368            if (this.delayBeforeCanPickup <= 0 && (event.getResult() == Result.ALLOW || i <= 0 || par1EntityPlayer.inventory.addItemStackToInventory(itemstack)))
    369            {
    370                if (itemstack.itemID == Block.wood.blockID)
    371                {
    372                    par1EntityPlayer.triggerAchievement(AchievementList.mineWood);
    373                }
    374
    375                if (itemstack.itemID == Item.leather.itemID)
    376                {
    377                    par1EntityPlayer.triggerAchievement(AchievementList.killCow);
    378                }
    379
    380                if (itemstack.itemID == Item.diamond.itemID)
    381                {
    382                    par1EntityPlayer.triggerAchievement(AchievementList.diamonds);
    383                }
    384
    385                if (itemstack.itemID == Item.blazeRod.itemID)
    386                {
    387                    par1EntityPlayer.triggerAchievement(AchievementList.blazeRod);
    388                }
    389
    390                GameRegistry.onPickupNotification(par1EntityPlayer, this);
    391
    392                this.playSound("random.pop", 0.2F, ((this.rand.nextFloat() - this.rand.nextFloat()) * 0.7F + 1.0F) * 2.0F);
    393                par1EntityPlayer.onItemPickup(this, i);
    394
    395                if (itemstack.stackSize <= 0)
    396                {
    397                    this.setDead();
    398                }
    399            }
    400        }
    401    }
    402
    403    /**
    404     * Gets the username of the entity.
    405     */
    406    public String getEntityName()
    407    {
    408        return StatCollector.translateToLocal("item." + this.getEntityItem().getItemName());
    409    }
    410
    411    /**
    412     * If returns false, the item will not inflict any damage against entities.
    413     */
    414    public boolean canAttackWithItem()
    415    {
    416        return false;
    417    }
    418
    419    /**
    420     * Teleports the entity to another dimension. Params: Dimension number to teleport to
    421     */
    422    public void travelToDimension(int par1)
    423    {
    424        super.travelToDimension(par1);
    425
    426        if (!this.worldObj.isRemote)
    427        {
    428            this.searchForOtherItemsNearby();
    429        }
    430    }
    431
    432    /**
    433     * Returns the ItemStack corresponding to the Entity (Note: if no item exists, will log an error but still return an
    434     * ItemStack containing Block.stone)
    435     */
    436    public ItemStack getEntityItem()
    437    {
    438        ItemStack itemstack = this.getDataWatcher().getWatchableObjectItemStack(10);
    439
    440        if (itemstack == null)
    441        {
    442            if (this.worldObj != null)
    443            {
    444                this.worldObj.getWorldLogAgent().logSevere("Item entity " + this.entityId + " has no item?!");
    445            }
    446
    447            return new ItemStack(Block.stone);
    448        }
    449        else
    450        {
    451            return itemstack;
    452        }
    453    }
    454
    455    /**
    456     * Sets the ItemStack for this entity
    457     */
    458    public void setEntityItemStack(ItemStack par1ItemStack)
    459    {
    460        this.getDataWatcher().updateObject(10, par1ItemStack);
    461        this.getDataWatcher().setObjectWatched(10);
    462    }
    463}