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 /**
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.func_92013_a(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 var1 = (int)this.prevPosX != (int)this.posX || (int)this.prevPosY != (int)this.posY || (int)this.prevPosZ != (int)this.posZ;
108
109 if (var1 || 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.func_85054_d();
122 }
123 }
124
125 float var2 = 0.98F;
126
127 if (this.onGround)
128 {
129 var2 = 0.58800006F;
130 int var3 = this.worldObj.getBlockId(MathHelper.floor_double(this.posX), MathHelper.floor_double(this.boundingBox.minY) - 1, MathHelper.floor_double(this.posZ));
131
132 if (var3 > 0)
133 {
134 var2 = Block.blocksList[var3].slipperiness * 0.98F;
135 }
136 }
137
138 this.motionX *= (double)var2;
139 this.motionY *= 0.9800000190734863D;
140 this.motionZ *= (double)var2;
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 private void func_85054_d()
178 {
179 Iterator var1 = this.worldObj.getEntitiesWithinAABB(EntityItem.class, this.boundingBox.expand(0.5D, 0.0D, 0.5D)).iterator();
180
181 while (var1.hasNext())
182 {
183 EntityItem var2 = (EntityItem)var1.next();
184 this.combineItems(var2);
185 }
186 }
187
188 /**
189 * Tries to merge this item with the item passed as the parameter. Returns true if successful. Either this item or
190 * the other item will be removed from the world.
191 */
192 public boolean combineItems(EntityItem par1EntityItem)
193 {
194 if (par1EntityItem == this)
195 {
196 return false;
197 }
198 else if (par1EntityItem.isEntityAlive() && this.isEntityAlive())
199 {
200 ItemStack var2 = this.func_92014_d();
201 ItemStack var3 = par1EntityItem.func_92014_d();
202
203 if (var3.getItem() != var2.getItem())
204 {
205 return false;
206 }
207 else if (var3.hasTagCompound() ^ var2.hasTagCompound())
208 {
209 return false;
210 }
211 else if (var3.hasTagCompound() && !var3.getTagCompound().equals(var2.getTagCompound()))
212 {
213 return false;
214 }
215 else if (var3.getItem().getHasSubtypes() && var3.getItemDamage() != var2.getItemDamage())
216 {
217 return false;
218 }
219 else if (var3.stackSize < var2.stackSize)
220 {
221 return par1EntityItem.combineItems(this);
222 }
223 else if (var3.stackSize + var2.stackSize > var3.getMaxStackSize())
224 {
225 return false;
226 }
227 else
228 {
229 var3.stackSize += var2.stackSize;
230 par1EntityItem.delayBeforeCanPickup = Math.max(par1EntityItem.delayBeforeCanPickup, this.delayBeforeCanPickup);
231 par1EntityItem.age = Math.min(par1EntityItem.age, this.age);
232 par1EntityItem.func_92013_a(var3);
233 this.setDead();
234 return true;
235 }
236 }
237 else
238 {
239 return false;
240 }
241 }
242
243 public void func_70288_d()
244 {
245 this.age = 4800;
246 }
247
248 /**
249 * Returns if this entity is in water and will end up adding the waters velocity to the entity
250 */
251 public boolean handleWaterMovement()
252 {
253 return this.worldObj.handleMaterialAcceleration(this.boundingBox, Material.water, this);
254 }
255
256 /**
257 * Will deal the specified amount of damage to the entity if the entity isn't immune to fire damage. Args:
258 * amountDamage
259 */
260 protected void dealFireDamage(int par1)
261 {
262 this.attackEntityFrom(DamageSource.inFire, par1);
263 }
264
265 /**
266 * Called when the entity is attacked.
267 */
268 public boolean attackEntityFrom(DamageSource par1DamageSource, int par2)
269 {
270 if (this.isEntityInvulnerable())
271 {
272 return false;
273 }
274 else if (this.func_92014_d() != null && this.func_92014_d().itemID == Item.netherStar.itemID && par1DamageSource == DamageSource.explosion)
275 {
276 return false;
277 }
278 else
279 {
280 this.setBeenAttacked();
281 this.health -= par2;
282
283 if (this.health <= 0)
284 {
285 this.setDead();
286 }
287
288 return false;
289 }
290 }
291
292 /**
293 * (abstract) Protected helper method to write subclass entity data to NBT.
294 */
295 public void writeEntityToNBT(NBTTagCompound par1NBTTagCompound)
296 {
297 par1NBTTagCompound.setShort("Health", (short)((byte)this.health));
298 par1NBTTagCompound.setShort("Age", (short)this.age);
299 par1NBTTagCompound.setInteger("Lifespan", lifespan);
300
301 if (this.func_92014_d() != null)
302 {
303 par1NBTTagCompound.setCompoundTag("Item", this.func_92014_d().writeToNBT(new NBTTagCompound()));
304 }
305 }
306
307 /**
308 * (abstract) Protected helper method to read subclass entity data from NBT.
309 */
310 public void readEntityFromNBT(NBTTagCompound par1NBTTagCompound)
311 {
312 this.health = par1NBTTagCompound.getShort("Health") & 255;
313 this.age = par1NBTTagCompound.getShort("Age");
314 NBTTagCompound var2 = par1NBTTagCompound.getCompoundTag("Item");
315 this.func_92013_a(ItemStack.loadItemStackFromNBT(var2));
316
317 ItemStack item = getDataWatcher().getWatchableObjectItemStack(10);
318
319 if (item == null || item.stackSize <= 0)
320 {
321 this.setDead();
322 }
323
324 if (par1NBTTagCompound.hasKey("Lifespan"))
325 {
326 lifespan = par1NBTTagCompound.getInteger("Lifespan");
327 }
328 }
329
330 /**
331 * Called by a player entity when they collide with an entity
332 */
333 public void onCollideWithPlayer(EntityPlayer par1EntityPlayer)
334 {
335 if (!this.worldObj.isRemote)
336 {
337 if (this.delayBeforeCanPickup > 0)
338 {
339 return;
340 }
341
342 EntityItemPickupEvent event = new EntityItemPickupEvent(par1EntityPlayer, this);
343
344 if (MinecraftForge.EVENT_BUS.post(event))
345 {
346 return;
347 }
348
349 ItemStack var2 = this.func_92014_d();
350 int var3 = var2.stackSize;
351
352 if (this.delayBeforeCanPickup <= 0 && (event.getResult() == Result.ALLOW || var3 <= 0 || par1EntityPlayer.inventory.addItemStackToInventory(var2)))
353 {
354 if (var2.itemID == Block.wood.blockID)
355 {
356 par1EntityPlayer.triggerAchievement(AchievementList.mineWood);
357 }
358
359 if (var2.itemID == Item.leather.itemID)
360 {
361 par1EntityPlayer.triggerAchievement(AchievementList.killCow);
362 }
363
364 if (var2.itemID == Item.diamond.itemID)
365 {
366 par1EntityPlayer.triggerAchievement(AchievementList.diamonds);
367 }
368
369 if (var2.itemID == Item.blazeRod.itemID)
370 {
371 par1EntityPlayer.triggerAchievement(AchievementList.blazeRod);
372 }
373
374 GameRegistry.onPickupNotification(par1EntityPlayer, this);
375
376 this.playSound("random.pop", 0.2F, ((this.rand.nextFloat() - this.rand.nextFloat()) * 0.7F + 1.0F) * 2.0F);
377 par1EntityPlayer.onItemPickup(this, var3);
378
379 if (var2.stackSize <= 0)
380 {
381 this.setDead();
382 }
383 }
384 }
385 }
386
387 /**
388 * Gets the username of the entity.
389 */
390 public String getEntityName()
391 {
392 return StatCollector.translateToLocal("item." + this.func_92014_d().getItemName());
393 }
394
395 /**
396 * If returns false, the item will not inflict any damage against entities.
397 */
398 public boolean canAttackWithItem()
399 {
400 return false;
401 }
402
403 /**
404 * Teleports the entity to another dimension. Params: Dimension number to teleport to
405 */
406 public void travelToDimension(int par1)
407 {
408 super.travelToDimension(par1);
409
410 if (!this.worldObj.isRemote)
411 {
412 this.func_85054_d();
413 }
414 }
415
416 public ItemStack func_92014_d()
417 {
418 ItemStack var1 = this.getDataWatcher().getWatchableObjectItemStack(10);
419
420 if (var1 == null)
421 {
422 System.out.println("Item entity " + this.entityId + " has no item?!");
423 return new ItemStack(Block.stone);
424 }
425 else
426 {
427 return var1;
428 }
429 }
430
431 public void func_92013_a(ItemStack par1ItemStack)
432 {
433 this.getDataWatcher().updateObject(10, par1ItemStack);
434 this.getDataWatcher().func_82708_h(10);
435 }
436 }