content: package net.minecraft.item;
  
  import net.minecraft.enchantment.Enchantment;
  import net.minecraft.enchantment.EnchantmentData;
  import net.minecraft.enchantment.EnchantmentHelper;
  import net.minecraft.entity.player.EntityPlayer;
  import net.minecraft.init.Items;
  import net.minecraft.nbt.NBTTagCompound;
  import net.minecraft.nbt.NBTTagList;
  import net.minecraft.util.WeightedRandomChestContent;
  
  import java.util.List;
  import java.util.Random;
  
  public class ItemEnchantedBook extends Item {
      public boolean hasEffect(ItemStack stack) {
          return true;
      }
  
      public boolean isItemTool(ItemStack stack) {
          return false;
      }
  
      public EnumRarity getRarity(ItemStack stack) {
          return this.getEnchantments(stack).tagCount() > 0 ? EnumRarity.UNCOMMON : super.getRarity(stack);
      }
  
      public NBTTagList getEnchantments(ItemStack stack) {
          NBTTagCompound nbttagcompound = stack.getTagCompound();
          return nbttagcompound != null && nbttagcompound.hasKey("StoredEnchantments", 9) ? (NBTTagList) nbttagcompound.getTag("StoredEnchantments") : new NBTTagList();
      }
  
      public void addInformation(ItemStack stack, EntityPlayer playerIn, List<String> tooltip, boolean advanced) {
          super.addInformation(stack, playerIn, tooltip, advanced);
          NBTTagList nbttaglist = this.getEnchantments(stack);
  
          if (nbttaglist != null) {
              for (int i = 0; i < nbttaglist.tagCount(); ++i) {
                  int j = nbttaglist.getCompoundTagAt(i).getShort("id");
                  int k = nbttaglist.getCompoundTagAt(i).getShort("lvl");
  
                  if (Enchantment.getEnchantmentById(j) != null) {
                      tooltip.add(Enchantment.getEnchantmentById(j).getTranslatedName(k));
                  }
              }
          }
      }
  
      public void addEnchantment(ItemStack stack, EnchantmentData enchantment) {
          NBTTagList nbttaglist = this.getEnchantments(stack);
          boolean flag = true;
  
          for (int i = 0; i < nbttaglist.tagCount(); ++i) {
              NBTTagCompound nbttagcompound = nbttaglist.getCompoundTagAt(i);
  
              if (nbttagcompound.getShort("id") == enchantment.enchantmentobj.effectId) {
                  if (nbttagcompound.getShort("lvl") < enchantment.enchantmentLevel) {
                      nbttagcompound.setShort("lvl", (short) enchantment.enchantmentLevel);
                  }
  
                  flag = false;
                  break;
              }
          }
  
          if (flag) {
              NBTTagCompound nbttagcompound1 = new NBTTagCompound();
              nbttagcompound1.setShort("id", (short) enchantment.enchantmentobj.effectId);
              nbttagcompound1.setShort("lvl", (short) enchantment.enchantmentLevel);
              nbttaglist.appendTag(nbttagcompound1);
          }
  
          if (!stack.hasTagCompound()) {
              stack.setTagCompound(new NBTTagCompound());
          }
  
          stack.getTagCompound().setTag("StoredEnchantments", nbttaglist);
      }
  
      public ItemStack getEnchantedItemStack(EnchantmentData data) {
          ItemStack itemstack = new ItemStack(this);
          this.addEnchantment(itemstack, data);
          return itemstack;
      }
  
      public void getAll(Enchantment enchantment, List<ItemStack> list) {
          for (int i = enchantment.getMinLevel(); i <= enchantment.getMaxLevel(); ++i) {
              list.add(this.getEnchantedItemStack(new EnchantmentData(enchantment, i)));
          }
      }
  
      public WeightedRandomChestContent getRandom(Random rand) {
          return this.getRandom(rand, 1, 1, 1);
      }
  
      public WeightedRandomChestContent getRandom(Random rand, int minChance, int maxChance, int weight) {
          ItemStack itemstack = new ItemStack(Items.book, 1, 0);
          EnchantmentHelper.addRandomEnchantment(rand, itemstack, 30);
          return new WeightedRandomChestContent(itemstack, minChance, maxChance, weight);
      }
  }
  