001    package net.minecraft.src;
002    
003    import java.util.Iterator;
004    
005    import net.minecraftforge.common.MinecraftForge;
006    import net.minecraftforge.event.Event.Result;
007    import net.minecraftforge.event.entity.item.ItemExpireEvent;
008    import net.minecraftforge.event.entity.player.EntityItemPickupEvent;
009    
010    import cpw.mods.fml.common.registry.GameRegistry;
011    
012    public class EntityItem extends Entity
013    {
014        /** The item stack of this EntityItem. */
015        public ItemStack item;
016    
017        /**
018         * The age of this EntityItem (used to animate it up and down as well as expire it)
019         */
020        public int age = 0;
021        public int delayBeforeCanPickup;
022    
023        /** The health of this EntityItem. (For example, damage for tools) */
024        private int health = 5;
025    
026        /** The EntityItem's random initial float height. */
027        public float hoverStart = (float)(Math.random() * Math.PI * 2.0D);
028    
029        /**
030         * The maximum age of this EntityItem.  The item is expired once this is reached.
031         */
032        public int lifespan = 6000;
033    
034        public EntityItem(World par1World, double par2, double par4, double par6, ItemStack par8ItemStack)
035        {
036            super(par1World);
037            this.setSize(0.25F, 0.25F);
038            this.yOffset = this.height / 2.0F;
039            this.setPosition(par2, par4, par6);
040            this.item = par8ItemStack;
041            this.rotationYaw = (float)(Math.random() * 360.0D);
042            this.motionX = (double)((float)(Math.random() * 0.20000000298023224D - 0.10000000149011612D));
043            this.motionY = 0.20000000298023224D;
044            this.motionZ = (double)((float)(Math.random() * 0.20000000298023224D - 0.10000000149011612D));
045            this.lifespan = (par8ItemStack.getItem() == null ? 6000 : par8ItemStack.getItem().getEntityLifespan(par8ItemStack, par1World));
046        }
047    
048        /**
049         * returns if this entity triggers Block.onEntityWalking on the blocks they walk on. used for spiders and wolves to
050         * prevent them from trampling crops
051         */
052        protected boolean canTriggerWalking()
053        {
054            return false;
055        }
056    
057        public EntityItem(World par1World)
058        {
059            super(par1World);
060            this.setSize(0.25F, 0.25F);
061            this.yOffset = this.height / 2.0F;
062        }
063    
064        protected void entityInit() {}
065    
066        /**
067         * Called to update the entity's position/logic.
068         */
069        public void onUpdate()
070        {
071            super.onUpdate();
072    
073            if (this.delayBeforeCanPickup > 0)
074            {
075                --this.delayBeforeCanPickup;
076            }
077    
078            this.prevPosX = this.posX;
079            this.prevPosY = this.posY;
080            this.prevPosZ = this.posZ;
081            this.motionY -= 0.03999999910593033D;
082            this.pushOutOfBlocks(this.posX, (this.boundingBox.minY + this.boundingBox.maxY) / 2.0D, this.posZ);
083            this.moveEntity(this.motionX, this.motionY, this.motionZ);
084            boolean var1 = (int)this.prevPosX != (int)this.posX || (int)this.prevPosY != (int)this.posY || (int)this.prevPosZ != (int)this.posZ;
085    
086            if (var1)
087            {
088                if (this.worldObj.getBlockMaterial(MathHelper.floor_double(this.posX), MathHelper.floor_double(this.posY), MathHelper.floor_double(this.posZ)) == Material.lava)
089                {
090                    this.motionY = 0.20000000298023224D;
091                    this.motionX = (double)((this.rand.nextFloat() - this.rand.nextFloat()) * 0.2F);
092                    this.motionZ = (double)((this.rand.nextFloat() - this.rand.nextFloat()) * 0.2F);
093                    this.worldObj.playSoundAtEntity(this, "random.fizz", 0.4F, 2.0F + this.rand.nextFloat() * 0.4F);
094                }
095    
096                if (!this.worldObj.isRemote)
097                {
098                    Iterator var2 = this.worldObj.getEntitiesWithinAABB(EntityItem.class, this.boundingBox.expand(0.5D, 0.0D, 0.5D)).iterator();
099    
100                    while (var2.hasNext())
101                    {
102                        EntityItem var3 = (EntityItem)var2.next();
103                        this.func_70289_a(var3);
104                    }
105                }
106            }
107    
108            float var4 = 0.98F;
109    
110            if (this.onGround)
111            {
112                var4 = 0.58800006F;
113                int var5 = this.worldObj.getBlockId(MathHelper.floor_double(this.posX), MathHelper.floor_double(this.boundingBox.minY) - 1, MathHelper.floor_double(this.posZ));
114    
115                if (var5 > 0)
116                {
117                    var4 = Block.blocksList[var5].slipperiness * 0.98F;
118                }
119            }
120    
121            this.motionX *= (double)var4;
122            this.motionY *= 0.9800000190734863D;
123            this.motionZ *= (double)var4;
124    
125            if (this.onGround)
126            {
127                this.motionY *= -0.5D;
128            }
129    
130            ++this.age;
131    
132            if (!this.worldObj.isRemote && this.age >= lifespan)
133            {
134                ItemExpireEvent event = new ItemExpireEvent(this, (item.getItem() == null ? 6000 : item.getItem().getEntityLifespan(item, worldObj)));
135                if (MinecraftForge.EVENT_BUS.post(event))
136                {
137                    lifespan += event.extraLife;
138                }
139                else
140                {
141                    this.setDead();
142                }
143            }
144    
145            if (this.item == null || this.item.stackSize <= 0)
146            {
147                this.setDead();
148            }
149        }
150    
151        public boolean func_70289_a(EntityItem par1EntityItem)
152        {
153            if (par1EntityItem == this)
154            {
155                return false;
156            }
157            else if (par1EntityItem.isEntityAlive() && this.isEntityAlive())
158            {
159                if (par1EntityItem.item.getItem() != this.item.getItem())
160                {
161                    return false;
162                }
163                else if (!par1EntityItem.item.hasTagCompound() && !this.item.hasTagCompound())
164                {
165                    if (par1EntityItem.item.getItem().getHasSubtypes() && par1EntityItem.item.getItemDamage() != this.item.getItemDamage())
166                    {
167                        return false;
168                    }
169                    else if (par1EntityItem.item.stackSize < this.item.stackSize)
170                    {
171                        return par1EntityItem.func_70289_a(this);
172                    }
173                    else if (par1EntityItem.item.stackSize + this.item.stackSize > par1EntityItem.item.getMaxStackSize())
174                    {
175                        return false;
176                    }
177                    else
178                    {
179                        par1EntityItem.item.stackSize += this.item.stackSize;
180                        par1EntityItem.delayBeforeCanPickup = Math.max(par1EntityItem.delayBeforeCanPickup, this.delayBeforeCanPickup);
181                        par1EntityItem.age = Math.min(par1EntityItem.age, this.age);
182                        this.setDead();
183                        return true;
184                    }
185                }
186                else
187                {
188                    return false;
189                }
190            }
191            else
192            {
193                return false;
194            }
195        }
196    
197        public void func_70288_d()
198        {
199            this.age = 4800;
200        }
201    
202        /**
203         * Returns if this entity is in water and will end up adding the waters velocity to the entity
204         */
205        public boolean handleWaterMovement()
206        {
207            return this.worldObj.handleMaterialAcceleration(this.boundingBox, Material.water, this);
208        }
209    
210        /**
211         * Will deal the specified amount of damage to the entity if the entity isn't immune to fire damage. Args:
212         * amountDamage
213         */
214        protected void dealFireDamage(int par1)
215        {
216            this.attackEntityFrom(DamageSource.inFire, par1);
217        }
218    
219        /**
220         * Called when the entity is attacked.
221         */
222        public boolean attackEntityFrom(DamageSource par1DamageSource, int par2)
223        {
224            this.setBeenAttacked();
225            this.health -= par2;
226    
227            if (this.health <= 0)
228            {
229                this.setDead();
230            }
231    
232            return false;
233        }
234    
235        /**
236         * (abstract) Protected helper method to write subclass entity data to NBT.
237         */
238        public void writeEntityToNBT(NBTTagCompound par1NBTTagCompound)
239        {
240            par1NBTTagCompound.setShort("Health", (short)((byte)this.health));
241            par1NBTTagCompound.setShort("Age", (short)this.age);
242            par1NBTTagCompound.setInteger("Lifespan", lifespan);
243    
244            if (this.item != null)
245            {
246                par1NBTTagCompound.setCompoundTag("Item", this.item.writeToNBT(new NBTTagCompound()));
247            }
248        }
249    
250        /**
251         * (abstract) Protected helper method to read subclass entity data from NBT.
252         */
253        public void readEntityFromNBT(NBTTagCompound par1NBTTagCompound)
254        {
255            this.health = par1NBTTagCompound.getShort("Health") & 255;
256            this.age = par1NBTTagCompound.getShort("Age");
257            NBTTagCompound var2 = par1NBTTagCompound.getCompoundTag("Item");
258            this.item = ItemStack.loadItemStackFromNBT(var2);
259    
260            if (this.item == null || this.item.stackSize <= 0)
261            {
262                this.setDead();
263            }
264    
265            if (par1NBTTagCompound.hasKey("Lifespan"))
266            {
267                lifespan = par1NBTTagCompound.getInteger("Lifespan");
268            }
269        }
270    
271        /**
272         * Called by a player entity when they collide with an entity
273         */
274        public void onCollideWithPlayer(EntityPlayer par1EntityPlayer)
275        {
276            if (!this.worldObj.isRemote)
277            {
278                if (this.delayBeforeCanPickup > 0)
279                {
280                    return;
281                }
282    
283                EntityItemPickupEvent event = new EntityItemPickupEvent(par1EntityPlayer, this);
284    
285                if (MinecraftForge.EVENT_BUS.post(event))
286                {
287                    return;
288                }
289    
290                int var2 = this.item.stackSize;
291    
292                if (this.delayBeforeCanPickup <= 0 && (event.getResult() == Result.ALLOW || var2 <= 0 || par1EntityPlayer.inventory.addItemStackToInventory(this.item)))
293                {
294                    if (this.item.itemID == Block.wood.blockID)
295                    {
296                        par1EntityPlayer.triggerAchievement(AchievementList.mineWood);
297                    }
298    
299                    if (this.item.itemID == Item.leather.shiftedIndex)
300                    {
301                        par1EntityPlayer.triggerAchievement(AchievementList.killCow);
302                    }
303    
304                    if (this.item.itemID == Item.diamond.shiftedIndex)
305                    {
306                        par1EntityPlayer.triggerAchievement(AchievementList.diamonds);
307                    }
308    
309                    if (this.item.itemID == Item.blazeRod.shiftedIndex)
310                    {
311                        par1EntityPlayer.triggerAchievement(AchievementList.blazeRod);
312                    }
313    
314                    GameRegistry.onPickupNotification(par1EntityPlayer, this);
315    
316                    this.worldObj.playSoundAtEntity(this, "random.pop", 0.2F, ((this.rand.nextFloat() - this.rand.nextFloat()) * 0.7F + 1.0F) * 2.0F);
317                    par1EntityPlayer.onItemPickup(this, var2);
318    
319                    if (this.item.stackSize <= 0)
320                    {
321                        this.setDead();
322                    }
323                }
324            }
325        }
326    
327        /**
328         * Gets the username of the entity.
329         */
330        public String getEntityName()
331        {
332            return StatCollector.translateToLocal("item." + this.item.getItemName());
333        }
334    
335        /**
336         * If returns false, the item will not inflict any damage against entities.
337         */
338        public boolean canAttackWithItem()
339        {
340            return false;
341        }
342    }