001    package net.minecraft.entity.item;
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    import net.minecraft.block.Block;
012    import net.minecraft.block.material.Material;
013    import net.minecraft.entity.Entity;
014    import net.minecraft.entity.player.EntityPlayer;
015    import net.minecraft.item.Item;
016    import net.minecraft.item.ItemStack;
017    import net.minecraft.nbt.NBTTagCompound;
018    import net.minecraft.stats.AchievementList;
019    import net.minecraft.util.DamageSource;
020    import net.minecraft.util.MathHelper;
021    import net.minecraft.util.StatCollector;
022    import net.minecraft.world.World;
023    
024    public class EntityItem extends Entity
025    {
026        /** The item stack of this EntityItem. */
027        public ItemStack item;
028    
029        /**
030         * The age of this EntityItem (used to animate it up and down as well as expire it)
031         */
032        public int age = 0;
033        public int delayBeforeCanPickup;
034    
035        /** The health of this EntityItem. (For example, damage for tools) */
036        private int health = 5;
037    
038        /** The EntityItem's random initial float height. */
039        public float hoverStart = (float)(Math.random() * Math.PI * 2.0D);
040    
041        /**
042         * The maximum age of this EntityItem.  The item is expired once this is reached.
043         */
044        public int lifespan = 6000;
045    
046        public EntityItem(World par1World, double par2, double par4, double par6, ItemStack par8ItemStack)
047        {
048            super(par1World);
049            this.setSize(0.25F, 0.25F);
050            this.yOffset = this.height / 2.0F;
051            this.setPosition(par2, par4, par6);
052            this.item = par8ItemStack;
053            this.rotationYaw = (float)(Math.random() * 360.0D);
054            this.motionX = (double)((float)(Math.random() * 0.20000000298023224D - 0.10000000149011612D));
055            this.motionY = 0.20000000298023224D;
056            this.motionZ = (double)((float)(Math.random() * 0.20000000298023224D - 0.10000000149011612D));
057            this.lifespan = (par8ItemStack.getItem() == null ? 6000 : par8ItemStack.getItem().getEntityLifespan(par8ItemStack, par1World));
058        }
059    
060        /**
061         * returns if this entity triggers Block.onEntityWalking on the blocks they walk on. used for spiders and wolves to
062         * prevent them from trampling crops
063         */
064        protected boolean canTriggerWalking()
065        {
066            return false;
067        }
068    
069        public EntityItem(World par1World)
070        {
071            super(par1World);
072            this.setSize(0.25F, 0.25F);
073            this.yOffset = this.height / 2.0F;
074        }
075    
076        protected void entityInit() {}
077    
078        /**
079         * Called to update the entity's position/logic.
080         */
081        public void onUpdate()
082        {
083            super.onUpdate();
084    
085            if (this.delayBeforeCanPickup > 0)
086            {
087                --this.delayBeforeCanPickup;
088            }
089    
090            this.prevPosX = this.posX;
091            this.prevPosY = this.posY;
092            this.prevPosZ = this.posZ;
093            this.motionY -= 0.03999999910593033D;
094            this.noClip = this.pushOutOfBlocks(this.posX, (this.boundingBox.minY + this.boundingBox.maxY) / 2.0D, this.posZ);
095            this.moveEntity(this.motionX, this.motionY, this.motionZ);
096            boolean var1 = (int)this.prevPosX != (int)this.posX || (int)this.prevPosY != (int)this.posY || (int)this.prevPosZ != (int)this.posZ;
097    
098            if (var1)
099            {
100                if (this.worldObj.getBlockMaterial(MathHelper.floor_double(this.posX), MathHelper.floor_double(this.posY), MathHelper.floor_double(this.posZ)) == Material.lava)
101                {
102                    this.motionY = 0.20000000298023224D;
103                    this.motionX = (double)((this.rand.nextFloat() - this.rand.nextFloat()) * 0.2F);
104                    this.motionZ = (double)((this.rand.nextFloat() - this.rand.nextFloat()) * 0.2F);
105                    this.func_85030_a("random.fizz", 0.4F, 2.0F + this.rand.nextFloat() * 0.4F);
106                }
107    
108                if (!this.worldObj.isRemote)
109                {
110                    this.func_85054_d();
111                }
112            }
113    
114            float var2 = 0.98F;
115    
116            if (this.onGround)
117            {
118                var2 = 0.58800006F;
119                int var3 = this.worldObj.getBlockId(MathHelper.floor_double(this.posX), MathHelper.floor_double(this.boundingBox.minY) - 1, MathHelper.floor_double(this.posZ));
120    
121                if (var3 > 0)
122                {
123                    var2 = Block.blocksList[var3].slipperiness * 0.98F;
124                }
125            }
126    
127            this.motionX *= (double)var2;
128            this.motionY *= 0.9800000190734863D;
129            this.motionZ *= (double)var2;
130    
131            if (this.onGround)
132            {
133                this.motionY *= -0.5D;
134            }
135    
136            ++this.age;
137    
138            if (!this.worldObj.isRemote && this.age >= lifespan)
139            {
140                ItemExpireEvent event = new ItemExpireEvent(this, (item.getItem() == null ? 6000 : item.getItem().getEntityLifespan(item, worldObj)));
141                if (MinecraftForge.EVENT_BUS.post(event))
142                {
143                    lifespan += event.extraLife;
144                }
145                else
146                {
147                    this.setDead();
148                }
149            }
150    
151            if (this.item == null || this.item.stackSize <= 0)
152            {
153                this.setDead();
154            }
155        }
156    
157        private void func_85054_d()
158        {
159            Iterator var1 = this.worldObj.getEntitiesWithinAABB(EntityItem.class, this.boundingBox.expand(0.5D, 0.0D, 0.5D)).iterator();
160    
161            while (var1.hasNext())
162            {
163                EntityItem var2 = (EntityItem)var1.next();
164                this.func_70289_a(var2);
165            }
166        }
167    
168        public boolean func_70289_a(EntityItem par1EntityItem)
169        {
170            if (par1EntityItem == this)
171            {
172                return false;
173            }
174            else if (par1EntityItem.isEntityAlive() && this.isEntityAlive())
175            {
176                if (par1EntityItem.item.getItem() != this.item.getItem())
177                {
178                    return false;
179                }
180                else if (par1EntityItem.item.hasTagCompound() ^ this.item.hasTagCompound())
181                {
182                    return false;
183                }
184                else if (par1EntityItem.item.hasTagCompound() && !par1EntityItem.item.getTagCompound().equals(this.item.getTagCompound()))
185                {
186                    return false;
187                }
188                else if (par1EntityItem.item.getItem().getHasSubtypes() && par1EntityItem.item.getItemDamage() != this.item.getItemDamage())
189                {
190                    return false;
191                }
192                else if (par1EntityItem.item.stackSize < this.item.stackSize)
193                {
194                    return par1EntityItem.func_70289_a(this);
195                }
196                else if (par1EntityItem.item.stackSize + this.item.stackSize > par1EntityItem.item.getMaxStackSize())
197                {
198                    return false;
199                }
200                else
201                {
202                    par1EntityItem.item.stackSize += this.item.stackSize;
203                    par1EntityItem.delayBeforeCanPickup = Math.max(par1EntityItem.delayBeforeCanPickup, this.delayBeforeCanPickup);
204                    par1EntityItem.age = Math.min(par1EntityItem.age, this.age);
205                    this.setDead();
206                    return true;
207                }
208            }
209            else
210            {
211                return false;
212            }
213        }
214    
215        public void func_70288_d()
216        {
217            this.age = 4800;
218        }
219    
220        /**
221         * Returns if this entity is in water and will end up adding the waters velocity to the entity
222         */
223        public boolean handleWaterMovement()
224        {
225            return this.worldObj.handleMaterialAcceleration(this.boundingBox, Material.water, this);
226        }
227    
228        /**
229         * Will deal the specified amount of damage to the entity if the entity isn't immune to fire damage. Args:
230         * amountDamage
231         */
232        protected void dealFireDamage(int par1)
233        {
234            this.attackEntityFrom(DamageSource.inFire, par1);
235        }
236    
237        /**
238         * Called when the entity is attacked.
239         */
240        public boolean attackEntityFrom(DamageSource par1DamageSource, int par2)
241        {
242            if (this.func_85032_ar())
243            {
244                return false;
245            }
246            else
247            {
248                this.setBeenAttacked();
249                this.health -= par2;
250    
251                if (this.health <= 0)
252                {
253                    this.setDead();
254                }
255    
256                return false;
257            }
258        }
259    
260        /**
261         * (abstract) Protected helper method to write subclass entity data to NBT.
262         */
263        public void writeEntityToNBT(NBTTagCompound par1NBTTagCompound)
264        {
265            par1NBTTagCompound.setShort("Health", (short)((byte)this.health));
266            par1NBTTagCompound.setShort("Age", (short)this.age);
267            par1NBTTagCompound.setInteger("Lifespan", lifespan);
268    
269            if (this.item != null)
270            {
271                par1NBTTagCompound.setCompoundTag("Item", this.item.writeToNBT(new NBTTagCompound()));
272            }
273        }
274    
275        /**
276         * (abstract) Protected helper method to read subclass entity data from NBT.
277         */
278        public void readEntityFromNBT(NBTTagCompound par1NBTTagCompound)
279        {
280            this.health = par1NBTTagCompound.getShort("Health") & 255;
281            this.age = par1NBTTagCompound.getShort("Age");
282            NBTTagCompound var2 = par1NBTTagCompound.getCompoundTag("Item");
283            this.item = ItemStack.loadItemStackFromNBT(var2);
284    
285            if (this.item == null || this.item.stackSize <= 0)
286            {
287                this.setDead();
288            }
289    
290            if (par1NBTTagCompound.hasKey("Lifespan"))
291            {
292                lifespan = par1NBTTagCompound.getInteger("Lifespan");
293            }
294        }
295    
296        /**
297         * Called by a player entity when they collide with an entity
298         */
299        public void onCollideWithPlayer(EntityPlayer par1EntityPlayer)
300        {
301            if (!this.worldObj.isRemote)
302            {
303                if (this.delayBeforeCanPickup > 0)
304                {
305                    return;
306                }
307    
308                EntityItemPickupEvent event = new EntityItemPickupEvent(par1EntityPlayer, this);
309    
310                if (MinecraftForge.EVENT_BUS.post(event))
311                {
312                    return;
313                }
314    
315                int var2 = this.item.stackSize;
316    
317                if (this.delayBeforeCanPickup <= 0 && (event.getResult() == Result.ALLOW || var2 <= 0 || par1EntityPlayer.inventory.addItemStackToInventory(this.item)))
318                {
319                    if (this.item.itemID == Block.wood.blockID)
320                    {
321                        par1EntityPlayer.triggerAchievement(AchievementList.mineWood);
322                    }
323    
324                    if (this.item.itemID == Item.leather.shiftedIndex)
325                    {
326                        par1EntityPlayer.triggerAchievement(AchievementList.killCow);
327                    }
328    
329                    if (this.item.itemID == Item.diamond.shiftedIndex)
330                    {
331                        par1EntityPlayer.triggerAchievement(AchievementList.diamonds);
332                    }
333    
334                    if (this.item.itemID == Item.blazeRod.shiftedIndex)
335                    {
336                        par1EntityPlayer.triggerAchievement(AchievementList.blazeRod);
337                    }
338    
339                    GameRegistry.onPickupNotification(par1EntityPlayer, this);
340    
341                    this.func_85030_a("random.pop", 0.2F, ((this.rand.nextFloat() - this.rand.nextFloat()) * 0.7F + 1.0F) * 2.0F);
342                    par1EntityPlayer.onItemPickup(this, var2);
343    
344                    if (this.item.stackSize <= 0)
345                    {
346                        this.setDead();
347                    }
348                }
349            }
350        }
351    
352        /**
353         * Gets the username of the entity.
354         */
355        public String getEntityName()
356        {
357            return StatCollector.translateToLocal("item." + this.item.getItemName());
358        }
359    
360        /**
361         * If returns false, the item will not inflict any damage against entities.
362         */
363        public boolean canAttackWithItem()
364        {
365            return false;
366        }
367    
368        /**
369         * Teleports the entity to another dimension. Params: Dimension number to teleport to
370         */
371        public void travelToDimension(int par1)
372        {
373            super.travelToDimension(par1);
374    
375            if (!this.worldObj.isRemote)
376            {
377                this.func_85054_d();
378            }
379        }
380    }