    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        super.onUpdate();
    095
    096        if (this.delayBeforeCanPickup > 0)
    097        {
    098            --this.delayBeforeCanPickup;
    099        }
    100
    101        this.prevPosX = this.posX;
    102        this.prevPosY = this.posY;
    103        this.prevPosZ = this.posZ;
    104        this.motionY -= 0.03999999910593033D;
    105        this.noClip = this.pushOutOfBlocks(this.posX, (this.boundingBox.minY + this.boundingBox.maxY) / 2.0D, this.posZ);
    106        this.moveEntity(this.motionX, this.motionY, this.motionZ);
    107        boolean flag = (int)this.prevPosX != (int)this.posX || (int)this.prevPosY != (int)this.posY || (int)this.prevPosZ != (int)this.posZ;
    108
    109        if (flag || this.ticksExisted % 25 == 0)
    110        {
    111            if (this.worldObj.getBlockMaterial(MathHelper.floor_double(this.posX), MathHelper.floor_double(this.posY), MathHelper.floor_double(this.posZ)) == Material.lava)
    112            {
    113                this.motionY = 0.20000000298023224D;
    114                this.motionX = (double)((this.rand.nextFloat() - this.rand.nextFloat()) * 0.2F);
    115                this.motionZ = (double)((this.rand.nextFloat() - this.rand.nextFloat()) * 0.2F);
    116                this.playSound("random.fizz", 0.4F, 2.0F + this.rand.nextFloat() * 0.4F);
    117            }
    118
    119            if (!this.worldObj.isRemote)
    120            {
    121                this.searchForOtherItemsNearby();
    122            }
    123        }
    124
    125        float f = 0.98F;
    126
    127        if (this.onGround)
    128        {
    129            f = 0.58800006F;
    130            int i = this.worldObj.getBlockId(MathHelper.floor_double(this.posX), MathHelper.floor_double(this.boundingBox.minY) - 1, MathHelper.floor_double(this.posZ));
    131
    132            if (i > 0)
    133            {
    134                f = Block.blocksList[i].slipperiness * 0.98F;
    135            }
    136        }
    137
    138        this.motionX *= (double)f;
    139        this.motionY *= 0.9800000190734863D;
    140        this.motionZ *= (double)f;
    141
    142        if (this.onGround)
    143        {
    144            this.motionY *= -0.5D;
    145        }
    146
    147        ++this.age;
    148
    149        ItemStack item = getDataWatcher().getWatchableObjectItemStack(10);
    150
    151        if (!this.worldObj.isRemote && this.age >= lifespan)
    152        {
    153            if (item != null)
    154            {
    155                ItemExpireEvent event = new ItemExpireEvent(this, (item.getItem() == null ? 6000 : item.getItem().getEntityLifespan(item, worldObj)));
    156                if (MinecraftForge.EVENT_BUS.post(event))
    157                {
    158                    lifespan += event.extraLife;
    159                }
    160                else
    161                {
    162                    this.setDead();
    163                }
    164            }
    165            else
    166            {
    167                this.setDead();
    168            }
    169        }
    170
    171        if (item != null && item.stackSize <= 0)
    172        {
    173            this.setDead();
    174        }
    175    }
    176
    177    /**
    178     * Looks for other itemstacks nearby and tries to stack them together
    179     */
    180    private void searchForOtherItemsNearby()
    181    {
    182        Iterator iterator = this.worldObj.getEntitiesWithinAABB(EntityItem.class, this.boundingBox.expand(0.5D, 0.0D, 0.5D)).iterator();
    183
    184        while (iterator.hasNext())
    185        {
    186            EntityItem entityitem = (EntityItem)iterator.next();
    187            this.combineItems(entityitem);
    188        }
    189    }
    190
    191    /**
    192     * Tries to merge this item with the item passed as the parameter. Returns true if successful. Either this item or
    193     * the other item will  be removed from the world.
    194     */
    195    public boolean combineItems(EntityItem par1EntityItem)
    196    {
    197        if (par1EntityItem == this)
    198        {
    199            return false;
    200        }
    201        else if (par1EntityItem.isEntityAlive() && this.isEntityAlive())
    202        {
    203            ItemStack itemstack = this.getEntityItem();
    204            ItemStack itemstack1 = par1EntityItem.getEntityItem();
    205
    206            if (itemstack1.getItem() != itemstack.getItem())
    207            {
    208                return false;
    209            }
    210            else if (itemstack1.hasTagCompound() ^ itemstack.hasTagCompound())
    211            {
    212                return false;
    213            }
    214            else if (itemstack1.hasTagCompound() && !itemstack1.getTagCompound().equals(itemstack.getTagCompound()))
    215            {
    216                return false;
    217            }
    218            else if (itemstack1.getItem().getHasSubtypes() && itemstack1.getItemDamage() != itemstack.getItemDamage())
    219            {
    220                return false;
    221            }
    222            else if (itemstack1.stackSize < itemstack.stackSize)
    223            {
    224                return par1EntityItem.combineItems(this);
    225            }
    226            else if (itemstack1.stackSize + itemstack.stackSize > itemstack1.getMaxStackSize())
    227            {
    228                return false;
    229            }
    230            else
    231            {
    232                itemstack1.stackSize += itemstack.stackSize;
    233                par1EntityItem.delayBeforeCanPickup = Math.max(par1EntityItem.delayBeforeCanPickup, this.delayBeforeCanPickup);
    234                par1EntityItem.age = Math.min(par1EntityItem.age, this.age);
    235                par1EntityItem.setEntityItemStack(itemstack1);
    236                this.setDead();
    237                return true;
    238            }
    239        }
    240        else
    241        {
    242            return false;
    243        }
    244    }
    245
    246    /**
    247     * sets the age of the item so that it'll despawn one minute after it has been dropped (instead of five). Used when
    248     * items are dropped from players in creative mode
    249     */
    250    public void setAgeToCreativeDespawnTime()
    251    {
    252        this.age = 4800;
    253    }
    254
    255    /**
    256     * Returns if this entity is in water and will end up adding the waters velocity to the entity
    257     */
    258    public boolean handleWaterMovement()
    259    {
    260        return this.worldObj.handleMaterialAcceleration(this.boundingBox, Material.water, this);
    261    }
    262
    263    /**
    264     * Will deal the specified amount of damage to the entity if the entity isn't immune to fire damage. Args:
    265     * amountDamage
    266     */
    267    protected void dealFireDamage(int par1)
    268    {
    269        this.attackEntityFrom(DamageSource.inFire, par1);
    270    }
    271
    272    /**
    273     * Called when the entity is attacked.
    274     */
    275    public boolean attackEntityFrom(DamageSource par1DamageSource, int par2)
    276    {
    277        if (this.isEntityInvulnerable())
    278        {
    279            return false;
    280        }
    281        else if (this.getEntityItem() != null && this.getEntityItem().itemID == Item.netherStar.itemID && par1DamageSource.func_94541_c())
    282        {
    283            return false;
    284        }
    285        else
    286        {
    287            this.setBeenAttacked();
    288            this.health -= par2;
    289
    290            if (this.health <= 0)
    291            {
    292                this.setDead();
    293            }
    294
    295            return false;
    296        }
    297    }
    298
    299    /**
    300     * (abstract) Protected helper method to write subclass entity data to NBT.
    301     */
    302    public void writeEntityToNBT(NBTTagCompound par1NBTTagCompound)
    303    {
    304        par1NBTTagCompound.setShort("Health", (short)((byte)this.health));
    305        par1NBTTagCompound.setShort("Age", (short)this.age);
    306        par1NBTTagCompound.setInteger("Lifespan", lifespan);
    307
    308        if (this.getEntityItem() != null)
    309        {
    310            par1NBTTagCompound.setCompoundTag("Item", this.getEntityItem().writeToNBT(new NBTTagCompound()));
    311        }
    312    }
    313
    314    /**
    315     * (abstract) Protected helper method to read subclass entity data from NBT.
    316     */
    317    public void readEntityFromNBT(NBTTagCompound par1NBTTagCompound)
    318    {
    319        this.health = par1NBTTagCompound.getShort("Health") & 255;
    320        this.age = par1NBTTagCompound.getShort("Age");
    321        NBTTagCompound nbttagcompound1 = par1NBTTagCompound.getCompoundTag("Item");
    322        this.setEntityItemStack(ItemStack.loadItemStackFromNBT(nbttagcompound1));
    323
    324        ItemStack item = getDataWatcher().getWatchableObjectItemStack(10);
    325
    326        if (item == null || item.stackSize <= 0)
    327        {
    328            this.setDead();
    329        }
    330
    331        if (par1NBTTagCompound.hasKey("Lifespan"))
    332        {
    333            lifespan = par1NBTTagCompound.getInteger("Lifespan");
    334        }
    335    }
    336
    337    /**
    338     * Called by a player entity when they collide with an entity
    339     */
    340    public void onCollideWithPlayer(EntityPlayer par1EntityPlayer)
    341    {
    342        if (!this.worldObj.isRemote)
    343        {
    344            if (this.delayBeforeCanPickup > 0)
    345            {
    346                return;
    347            }
    348
    349            EntityItemPickupEvent event = new EntityItemPickupEvent(par1EntityPlayer, this);
    350
    351            if (MinecraftForge.EVENT_BUS.post(event))
    352            {
    353                return;
    354            }
    355
    356            ItemStack itemstack = this.getEntityItem();
    357            int i = itemstack.stackSize;
    358
    359            if (this.delayBeforeCanPickup <= 0 && (event.getResult() == Result.ALLOW || i <= 0 || par1EntityPlayer.inventory.addItemStackToInventory(itemstack)))
    360            {
    361                if (itemstack.itemID == Block.wood.blockID)
    362                {
    363                    par1EntityPlayer.triggerAchievement(AchievementList.mineWood);
    364                }
    365
    366                if (itemstack.itemID == Item.leather.itemID)
    367                {
    368                    par1EntityPlayer.triggerAchievement(AchievementList.killCow);
    369                }
    370
    371                if (itemstack.itemID == Item.diamond.itemID)
    372                {
    373                    par1EntityPlayer.triggerAchievement(AchievementList.diamonds);
    374                }
    375
    376                if (itemstack.itemID == Item.blazeRod.itemID)
    377                {
    378                    par1EntityPlayer.triggerAchievement(AchievementList.blazeRod);
    379                }
    380
    381                GameRegistry.onPickupNotification(par1EntityPlayer, this);
    382
    383                this.playSound("random.pop", 0.2F, ((this.rand.nextFloat() - this.rand.nextFloat()) * 0.7F + 1.0F) * 2.0F);
    384                par1EntityPlayer.onItemPickup(this, i);
    385
    386                if (itemstack.stackSize <= 0)
    387                {
    388                    this.setDead();
    389                }
    390            }
    391        }
    392    }
    393
    394    /**
    395     * Gets the username of the entity.
    396     */
    397    public String getEntityName()
    398    {
    399        return StatCollector.translateToLocal("item." + this.getEntityItem().getItemName());
    400    }
    401
    402    /**
    403     * If returns false, the item will not inflict any damage against entities.
    404     */
    405    public boolean canAttackWithItem()
    406    {
    407        return false;
    408    }
    409
    410    /**
    411     * Teleports the entity to another dimension. Params: Dimension number to teleport to
    412     */
    413    public void travelToDimension(int par1)
    414    {
    415        super.travelToDimension(par1);
    416
    417        if (!this.worldObj.isRemote)
    418        {
    419            this.searchForOtherItemsNearby();
    420        }
    421    }
    422
    423    /**
    424     * Returns the ItemStack corresponding to the Entity (Note: if no item exists, will log an error but still return an
    425     * ItemStack containing Block.stone)
    426     */
    427    public ItemStack getEntityItem()
    428    {
    429        ItemStack itemstack = this.getDataWatcher().getWatchableObjectItemStack(10);
    430
    431        if (itemstack == null)
    432        {
    433            if (this.worldObj != null)
    434            {
    435                this.worldObj.func_98180_V().func_98232_c("Item entity " + this.entityId + " has no item?!");
    436            }
    437
    438            return new ItemStack(Block.stone);
    439        }
    440        else
    441        {
    442            return itemstack;
    443        }
    444    }
    445
    446    /**
    447     * Sets the ItemStack for this entity
    448     */
    449    public void setEntityItemStack(ItemStack par1ItemStack)
    450    {
    451        this.getDataWatcher().updateObject(10, par1ItemStack);
    452        this.getDataWatcher().setObjectWatched(10);
    453    }
    454}