001 package net.minecraft.src;
002
003 import java.util.ArrayList;
004 import java.util.HashMap;
005 import java.util.Iterator;
006 import java.util.LinkedHashMap;
007 import java.util.List;
008 import java.util.Map;
009 import java.util.Random;
010
011 public class EnchantmentHelper
012 {
013 /** Is the random seed of enchantment effects. */
014 private static final Random enchantmentRand = new Random();
015
016 /**
017 * Used to calculate the extra armor of enchantments on armors equipped on player.
018 */
019 private static final EnchantmentModifierDamage enchantmentModifierDamage = new EnchantmentModifierDamage((Empty3)null);
020
021 /**
022 * Used to calculate the (magic) extra damage done by enchantments on current equipped item of player.
023 */
024 private static final EnchantmentModifierLiving enchantmentModifierLiving = new EnchantmentModifierLiving((Empty3)null);
025
026 /**
027 * Returns the level of enchantment on the ItemStack passed.
028 */
029 public static int getEnchantmentLevel(int par0, ItemStack par1ItemStack)
030 {
031 if (par1ItemStack == null)
032 {
033 return 0;
034 }
035 else
036 {
037 NBTTagList var2 = par1ItemStack.getEnchantmentTagList();
038
039 if (var2 == null)
040 {
041 return 0;
042 }
043 else
044 {
045 for (int var3 = 0; var3 < var2.tagCount(); ++var3)
046 {
047 short var4 = ((NBTTagCompound)var2.tagAt(var3)).getShort("id");
048 short var5 = ((NBTTagCompound)var2.tagAt(var3)).getShort("lvl");
049
050 if (var4 == par0)
051 {
052 return var5;
053 }
054 }
055
056 return 0;
057 }
058 }
059 }
060
061 /**
062 * Return the enchantments for the specified stack.
063 */
064 public static Map getEnchantments(ItemStack par0ItemStack)
065 {
066 LinkedHashMap var1 = new LinkedHashMap();
067 NBTTagList var2 = par0ItemStack.getEnchantmentTagList();
068
069 if (var2 != null)
070 {
071 for (int var3 = 0; var3 < var2.tagCount(); ++var3)
072 {
073 short var4 = ((NBTTagCompound)var2.tagAt(var3)).getShort("id");
074 short var5 = ((NBTTagCompound)var2.tagAt(var3)).getShort("lvl");
075 var1.put(Integer.valueOf(var4), Integer.valueOf(var5));
076 }
077 }
078
079 return var1;
080 }
081
082 /**
083 * Set the enchantments for the specified stack.
084 */
085 public static void setEnchantments(Map par0Map, ItemStack par1ItemStack)
086 {
087 NBTTagList var2 = new NBTTagList();
088 Iterator var3 = par0Map.keySet().iterator();
089
090 while (var3.hasNext())
091 {
092 int var4 = ((Integer)var3.next()).intValue();
093 NBTTagCompound var5 = new NBTTagCompound();
094 var5.setShort("id", (short)var4);
095 var5.setShort("lvl", (short)((Integer)par0Map.get(Integer.valueOf(var4))).intValue());
096 var2.appendTag(var5);
097 }
098
099 if (var2.tagCount() > 0)
100 {
101 par1ItemStack.func_77983_a("ench", var2);
102 }
103 else if (par1ItemStack.hasTagCompound())
104 {
105 par1ItemStack.getTagCompound().removeTag("ench");
106 }
107 }
108
109 /**
110 * Returns the biggest level of the enchantment on the array of ItemStack passed.
111 */
112 private static int getMaxEnchantmentLevel(int par0, ItemStack[] par1ArrayOfItemStack)
113 {
114 int var2 = 0;
115 ItemStack[] var3 = par1ArrayOfItemStack;
116 int var4 = par1ArrayOfItemStack.length;
117
118 for (int var5 = 0; var5 < var4; ++var5)
119 {
120 ItemStack var6 = var3[var5];
121 int var7 = getEnchantmentLevel(par0, var6);
122
123 if (var7 > var2)
124 {
125 var2 = var7;
126 }
127 }
128
129 return var2;
130 }
131
132 /**
133 * Executes the enchantment modifier on the ItemStack passed.
134 */
135 private static void applyEnchantmentModifier(IEnchantmentModifier par0IEnchantmentModifier, ItemStack par1ItemStack)
136 {
137 if (par1ItemStack != null)
138 {
139 NBTTagList var2 = par1ItemStack.getEnchantmentTagList();
140
141 if (var2 != null)
142 {
143 for (int var3 = 0; var3 < var2.tagCount(); ++var3)
144 {
145 short var4 = ((NBTTagCompound)var2.tagAt(var3)).getShort("id");
146 short var5 = ((NBTTagCompound)var2.tagAt(var3)).getShort("lvl");
147
148 if (Enchantment.enchantmentsList[var4] != null)
149 {
150 par0IEnchantmentModifier.calculateModifier(Enchantment.enchantmentsList[var4], var5);
151 }
152 }
153 }
154 }
155 }
156
157 /**
158 * Executes the enchantment modifier on the array of ItemStack passed.
159 */
160 private static void applyEnchantmentModifierArray(IEnchantmentModifier par0IEnchantmentModifier, ItemStack[] par1ArrayOfItemStack)
161 {
162 ItemStack[] var2 = par1ArrayOfItemStack;
163 int var3 = par1ArrayOfItemStack.length;
164
165 for (int var4 = 0; var4 < var3; ++var4)
166 {
167 ItemStack var5 = var2[var4];
168 applyEnchantmentModifier(par0IEnchantmentModifier, var5);
169 }
170 }
171
172 /**
173 * Returns the modifier of protection enchantments on armors equipped on player.
174 */
175 public static int getEnchantmentModifierDamage(ItemStack[] par0ArrayOfItemStack, DamageSource par1DamageSource)
176 {
177 enchantmentModifierDamage.damageModifier = 0;
178 enchantmentModifierDamage.source = par1DamageSource;
179 applyEnchantmentModifierArray(enchantmentModifierDamage, par0ArrayOfItemStack);
180
181 if (enchantmentModifierDamage.damageModifier > 25)
182 {
183 enchantmentModifierDamage.damageModifier = 25;
184 }
185
186 return (enchantmentModifierDamage.damageModifier + 1 >> 1) + enchantmentRand.nextInt((enchantmentModifierDamage.damageModifier >> 1) + 1);
187 }
188
189 /**
190 * Return the (magic) extra damage of the enchantments on player equipped item.
191 */
192 public static int getEnchantmentModifierLiving(EntityLiving par0EntityLiving, EntityLiving par1EntityLiving)
193 {
194 enchantmentModifierLiving.livingModifier = 0;
195 enchantmentModifierLiving.entityLiving = par1EntityLiving;
196 applyEnchantmentModifier(enchantmentModifierLiving, par0EntityLiving.getHeldItem());
197 return enchantmentModifierLiving.livingModifier > 0 ? 1 + enchantmentRand.nextInt(enchantmentModifierLiving.livingModifier) : 0;
198 }
199
200 /**
201 * Returns the knockback value of enchantments on equipped player item.
202 */
203 public static int getKnockbackModifier(EntityLiving par0EntityLiving, EntityLiving par1EntityLiving)
204 {
205 return getEnchantmentLevel(Enchantment.knockback.effectId, par0EntityLiving.getHeldItem());
206 }
207
208 public static int func_90036_a(EntityLiving par0EntityLiving)
209 {
210 return getEnchantmentLevel(Enchantment.fireAspect.effectId, par0EntityLiving.getHeldItem());
211 }
212
213 /**
214 * Returns the 'Water Breathing' modifier of enchantments on player equipped armors.
215 */
216 public static int getRespiration(EntityLiving par0EntityLiving)
217 {
218 return getMaxEnchantmentLevel(Enchantment.respiration.effectId, par0EntityLiving.getLastActiveItems());
219 }
220
221 /**
222 * Return the extra efficiency of tools based on enchantments on equipped player item.
223 */
224 public static int getEfficiencyModifier(EntityLiving par0EntityLiving)
225 {
226 return getEnchantmentLevel(Enchantment.efficiency.effectId, par0EntityLiving.getHeldItem());
227 }
228
229 /**
230 * Returns the unbreaking enchantment modifier on current equipped item of player.
231 */
232 public static int getUnbreakingModifier(EntityLiving par0EntityLiving)
233 {
234 return getEnchantmentLevel(Enchantment.unbreaking.effectId, par0EntityLiving.getHeldItem());
235 }
236
237 /**
238 * Returns the silk touch status of enchantments on current equipped item of player.
239 */
240 public static boolean getSilkTouchModifier(EntityLiving par0EntityLiving)
241 {
242 return getEnchantmentLevel(Enchantment.silkTouch.effectId, par0EntityLiving.getHeldItem()) > 0;
243 }
244
245 /**
246 * Returns the fortune enchantment modifier of the current equipped item of player.
247 */
248 public static int getFortuneModifier(EntityLiving par0EntityLiving)
249 {
250 return getEnchantmentLevel(Enchantment.fortune.effectId, par0EntityLiving.getHeldItem());
251 }
252
253 /**
254 * Returns the looting enchantment modifier of the current equipped item of player.
255 */
256 public static int getLootingModifier(EntityLiving par0EntityLiving)
257 {
258 return getEnchantmentLevel(Enchantment.looting.effectId, par0EntityLiving.getHeldItem());
259 }
260
261 /**
262 * Returns the aqua affinity status of enchantments on current equipped item of player.
263 */
264 public static boolean getAquaAffinityModifier(EntityLiving par0EntityLiving)
265 {
266 return getMaxEnchantmentLevel(Enchantment.aquaAffinity.effectId, par0EntityLiving.getLastActiveItems()) > 0;
267 }
268
269 /**
270 * Returns the enchantability of itemstack, it's uses a singular formula for each index (2nd parameter: 0, 1 and 2),
271 * cutting to the max enchantability power of the table (3rd parameter)
272 */
273 public static int calcItemStackEnchantability(Random par0Random, int par1, int par2, ItemStack par3ItemStack)
274 {
275 Item var4 = par3ItemStack.getItem();
276 int var5 = var4.getItemEnchantability();
277
278 if (var5 <= 0)
279 {
280 return 0;
281 }
282 else
283 {
284 if (par2 > 15)
285 {
286 par2 = 15;
287 }
288
289 int var6 = par0Random.nextInt(8) + 1 + (par2 >> 1) + par0Random.nextInt(par2 + 1);
290 return par1 == 0 ? Math.max(var6 / 3, 1) : (par1 == 1 ? var6 * 2 / 3 + 1 : Math.max(var6, par2 * 2));
291 }
292 }
293
294 /**
295 * Adds a random enchantment to the specified item. Args: random, itemStack, enchantabilityLevel
296 */
297 public static ItemStack addRandomEnchantment(Random par0Random, ItemStack par1ItemStack, int par2)
298 {
299 List var3 = buildEnchantmentList(par0Random, par1ItemStack, par2);
300
301 if (var3 != null)
302 {
303 Iterator var4 = var3.iterator();
304
305 while (var4.hasNext())
306 {
307 EnchantmentData var5 = (EnchantmentData)var4.next();
308 par1ItemStack.addEnchantment(var5.enchantmentobj, var5.enchantmentLevel);
309 }
310 }
311
312 return par1ItemStack;
313 }
314
315 /**
316 * Create a list of random EnchantmentData (enchantments) that can be added together to the ItemStack, the 3rd
317 * parameter is the total enchantability level.
318 */
319 public static List buildEnchantmentList(Random par0Random, ItemStack par1ItemStack, int par2)
320 {
321 Item var3 = par1ItemStack.getItem();
322 int var4 = var3.getItemEnchantability();
323
324 if (var4 <= 0)
325 {
326 return null;
327 }
328 else
329 {
330 var4 /= 2;
331 var4 = 1 + par0Random.nextInt((var4 >> 1) + 1) + par0Random.nextInt((var4 >> 1) + 1);
332 int var5 = var4 + par2;
333 float var6 = (par0Random.nextFloat() + par0Random.nextFloat() - 1.0F) * 0.15F;
334 int var7 = (int)((float)var5 * (1.0F + var6) + 0.5F);
335
336 if (var7 < 1)
337 {
338 var7 = 1;
339 }
340
341 ArrayList var8 = null;
342 Map var9 = mapEnchantmentData(var7, par1ItemStack);
343
344 if (var9 != null && !var9.isEmpty())
345 {
346 EnchantmentData var10 = (EnchantmentData)WeightedRandom.getRandomItem(par0Random, var9.values());
347
348 if (var10 != null)
349 {
350 var8 = new ArrayList();
351 var8.add(var10);
352
353 for (int var11 = var7; par0Random.nextInt(50) <= var11; var11 >>= 1)
354 {
355 Iterator var12 = var9.keySet().iterator();
356
357 while (var12.hasNext())
358 {
359 Integer var13 = (Integer)var12.next();
360 boolean var14 = true;
361 Iterator var15 = var8.iterator();
362
363 while (true)
364 {
365 if (var15.hasNext())
366 {
367 EnchantmentData var16 = (EnchantmentData)var15.next();
368
369 if (var16.enchantmentobj.canApplyTogether(Enchantment.enchantmentsList[var13.intValue()]))
370 {
371 continue;
372 }
373
374 var14 = false;
375 }
376
377 if (!var14)
378 {
379 var12.remove();
380 }
381
382 break;
383 }
384 }
385
386 if (!var9.isEmpty())
387 {
388 EnchantmentData var17 = (EnchantmentData)WeightedRandom.getRandomItem(par0Random, var9.values());
389 var8.add(var17);
390 }
391 }
392 }
393 }
394
395 return var8;
396 }
397 }
398
399 /**
400 * Creates a 'Map' of EnchantmentData (enchantments) possible to add on the ItemStack and the enchantability level
401 * passed.
402 */
403 public static Map mapEnchantmentData(int par0, ItemStack par1ItemStack)
404 {
405 Item var2 = par1ItemStack.getItem();
406 HashMap var3 = null;
407 Enchantment[] var4 = Enchantment.enchantmentsList;
408 int var5 = var4.length;
409
410 for (int var6 = 0; var6 < var5; ++var6)
411 {
412 Enchantment var7 = var4[var6];
413
414 if (var7 != null && var7.canEnchantItem(par1ItemStack))
415 {
416 for (int var8 = var7.getMinLevel(); var8 <= var7.getMaxLevel(); ++var8)
417 {
418 if (par0 >= var7.getMinEnchantability(var8) && par0 <= var7.getMaxEnchantability(var8))
419 {
420 if (var3 == null)
421 {
422 var3 = new HashMap();
423 }
424
425 var3.put(Integer.valueOf(var7.effectId), new EnchantmentData(var7, var8));
426 }
427 }
428 }
429 }
430
431 return var3;
432 }
433 }