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.noClip = 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.func_85030_a("random.fizz", 0.4F, 2.0F + this.rand.nextFloat() * 0.4F);
094                }
095    
096                if (!this.worldObj.isRemote)
097                {
098                    this.func_85054_d();
099                }
100            }
101    
102            float var2 = 0.98F;
103    
104            if (this.onGround)
105            {
106                var2 = 0.58800006F;
107                int var3 = this.worldObj.getBlockId(MathHelper.floor_double(this.posX), MathHelper.floor_double(this.boundingBox.minY) - 1, MathHelper.floor_double(this.posZ));
108    
109                if (var3 > 0)
110                {
111                    var2 = Block.blocksList[var3].slipperiness * 0.98F;
112                }
113            }
114    
115            this.motionX *= (double)var2;
116            this.motionY *= 0.9800000190734863D;
117            this.motionZ *= (double)var2;
118    
119            if (this.onGround)
120            {
121                this.motionY *= -0.5D;
122            }
123    
124            ++this.age;
125    
126            if (!this.worldObj.isRemote && this.age >= lifespan)
127            {
128                ItemExpireEvent event = new ItemExpireEvent(this, (item.getItem() == null ? 6000 : item.getItem().getEntityLifespan(item, worldObj)));
129                if (MinecraftForge.EVENT_BUS.post(event))
130                {
131                    lifespan += event.extraLife;
132                }
133                else
134                {
135                    this.setDead();
136                }
137            }
138    
139            if (this.item == null || this.item.stackSize <= 0)
140            {
141                this.setDead();
142            }
143        }
144    
145        private void func_85054_d()
146        {
147            Iterator var1 = this.worldObj.getEntitiesWithinAABB(EntityItem.class, this.boundingBox.expand(0.5D, 0.0D, 0.5D)).iterator();
148    
149            while (var1.hasNext())
150            {
151                EntityItem var2 = (EntityItem)var1.next();
152                this.func_70289_a(var2);
153            }
154        }
155    
156        public boolean func_70289_a(EntityItem par1EntityItem)
157        {
158            if (par1EntityItem == this)
159            {
160                return false;
161            }
162            else if (par1EntityItem.isEntityAlive() && this.isEntityAlive())
163            {
164                if (par1EntityItem.item.getItem() != this.item.getItem())
165                {
166                    return false;
167                }
168                else if (par1EntityItem.item.hasTagCompound() ^ this.item.hasTagCompound())
169                {
170                    return false;
171                }
172                else if (par1EntityItem.item.hasTagCompound() && !par1EntityItem.item.getTagCompound().equals(this.item.getTagCompound()))
173                {
174                    return false;
175                }
176                else if (par1EntityItem.item.getItem().getHasSubtypes() && par1EntityItem.item.getItemDamage() != this.item.getItemDamage())
177                {
178                    return false;
179                }
180                else if (par1EntityItem.item.stackSize < this.item.stackSize)
181                {
182                    return par1EntityItem.func_70289_a(this);
183                }
184                else if (par1EntityItem.item.stackSize + this.item.stackSize > par1EntityItem.item.getMaxStackSize())
185                {
186                    return false;
187                }
188                else
189                {
190                    par1EntityItem.item.stackSize += this.item.stackSize;
191                    par1EntityItem.delayBeforeCanPickup = Math.max(par1EntityItem.delayBeforeCanPickup, this.delayBeforeCanPickup);
192                    par1EntityItem.age = Math.min(par1EntityItem.age, this.age);
193                    this.setDead();
194                    return true;
195                }
196            }
197            else
198            {
199                return false;
200            }
201        }
202    
203        public void func_70288_d()
204        {
205            this.age = 4800;
206        }
207    
208        /**
209         * Returns if this entity is in water and will end up adding the waters velocity to the entity
210         */
211        public boolean handleWaterMovement()
212        {
213            return this.worldObj.handleMaterialAcceleration(this.boundingBox, Material.water, this);
214        }
215    
216        /**
217         * Will deal the specified amount of damage to the entity if the entity isn't immune to fire damage. Args:
218         * amountDamage
219         */
220        protected void dealFireDamage(int par1)
221        {
222            this.attackEntityFrom(DamageSource.inFire, par1);
223        }
224    
225        /**
226         * Called when the entity is attacked.
227         */
228        public boolean attackEntityFrom(DamageSource par1DamageSource, int par2)
229        {
230            if (this.func_85032_ar())
231            {
232                return false;
233            }
234            else
235            {
236                this.setBeenAttacked();
237                this.health -= par2;
238    
239                if (this.health <= 0)
240                {
241                    this.setDead();
242                }
243    
244                return false;
245            }
246        }
247    
248        /**
249         * (abstract) Protected helper method to write subclass entity data to NBT.
250         */
251        public void writeEntityToNBT(NBTTagCompound par1NBTTagCompound)
252        {
253            par1NBTTagCompound.setShort("Health", (short)((byte)this.health));
254            par1NBTTagCompound.setShort("Age", (short)this.age);
255            par1NBTTagCompound.setInteger("Lifespan", lifespan);
256    
257            if (this.item != null)
258            {
259                par1NBTTagCompound.setCompoundTag("Item", this.item.writeToNBT(new NBTTagCompound()));
260            }
261        }
262    
263        /**
264         * (abstract) Protected helper method to read subclass entity data from NBT.
265         */
266        public void readEntityFromNBT(NBTTagCompound par1NBTTagCompound)
267        {
268            this.health = par1NBTTagCompound.getShort("Health") & 255;
269            this.age = par1NBTTagCompound.getShort("Age");
270            NBTTagCompound var2 = par1NBTTagCompound.getCompoundTag("Item");
271            this.item = ItemStack.loadItemStackFromNBT(var2);
272    
273            if (this.item == null || this.item.stackSize <= 0)
274            {
275                this.setDead();
276            }
277    
278            if (par1NBTTagCompound.hasKey("Lifespan"))
279            {
280                lifespan = par1NBTTagCompound.getInteger("Lifespan");
281            }
282        }
283    
284        /**
285         * Called by a player entity when they collide with an entity
286         */
287        public void onCollideWithPlayer(EntityPlayer par1EntityPlayer)
288        {
289            if (!this.worldObj.isRemote)
290            {
291                if (this.delayBeforeCanPickup > 0)
292                {
293                    return;
294                }
295    
296                EntityItemPickupEvent event = new EntityItemPickupEvent(par1EntityPlayer, this);
297    
298                if (MinecraftForge.EVENT_BUS.post(event))
299                {
300                    return;
301                }
302    
303                int var2 = this.item.stackSize;
304    
305                if (this.delayBeforeCanPickup <= 0 && (event.getResult() == Result.ALLOW || var2 <= 0 || par1EntityPlayer.inventory.addItemStackToInventory(this.item)))
306                {
307                    if (this.item.itemID == Block.wood.blockID)
308                    {
309                        par1EntityPlayer.triggerAchievement(AchievementList.mineWood);
310                    }
311    
312                    if (this.item.itemID == Item.leather.shiftedIndex)
313                    {
314                        par1EntityPlayer.triggerAchievement(AchievementList.killCow);
315                    }
316    
317                    if (this.item.itemID == Item.diamond.shiftedIndex)
318                    {
319                        par1EntityPlayer.triggerAchievement(AchievementList.diamonds);
320                    }
321    
322                    if (this.item.itemID == Item.blazeRod.shiftedIndex)
323                    {
324                        par1EntityPlayer.triggerAchievement(AchievementList.blazeRod);
325                    }
326    
327                    GameRegistry.onPickupNotification(par1EntityPlayer, this);
328    
329                    this.func_85030_a("random.pop", 0.2F, ((this.rand.nextFloat() - this.rand.nextFloat()) * 0.7F + 1.0F) * 2.0F);
330                    par1EntityPlayer.onItemPickup(this, var2);
331    
332                    if (this.item.stackSize <= 0)
333                    {
334                        this.setDead();
335                    }
336                }
337            }
338        }
339    
340        /**
341         * Gets the username of the entity.
342         */
343        public String getEntityName()
344        {
345            return StatCollector.translateToLocal("item." + this.item.getItemName());
346        }
347    
348        /**
349         * If returns false, the item will not inflict any damage against entities.
350         */
351        public boolean canAttackWithItem()
352        {
353            return false;
354        }
355    
356        /**
357         * Teleports the entity to another dimension. Params: Dimension number to teleport to
358         */
359        public void travelToDimension(int par1)
360        {
361            super.travelToDimension(par1);
362    
363            if (!this.worldObj.isRemote)
364            {
365                this.func_85054_d();
366            }
367        }
368    }