feat: add various utilities

src/main/java/net/anvilcraft/anvillib/util/AnvilUtil.java

@@ -1,10 +1,67 @@
 package net.anvilcraft.anvillib.util;
 
+import java.util.Random;
+import java.util.UUID;
+import java.util.stream.IntStream;
+
+import net.minecraft.entity.item.EntityItem;
+import net.minecraft.inventory.IInventory;
+import net.minecraft.nbt.NBTTagList;
+import net.minecraft.nbt.NBTTagLong;
+import net.minecraft.tileentity.TileEntity;
+
 public class AnvilUtil {
+    public static final Random rand = new Random();
+
     public static <T extends Enum<T>> T enumFromInt(Class<T> clazz, int n) {
         T[] values = clazz.getEnumConstants();
         if (n < 0 || n >= values.length)
             return null;
         return values[n];
     }
+
+    public static NBTTagList uuidToNBT(UUID uuid) {
+        NBTTagList nbt = new NBTTagList();
+
+        nbt.appendTag(new NBTTagLong(uuid.getMostSignificantBits()));
+        nbt.appendTag(new NBTTagLong(uuid.getLeastSignificantBits()));
+
+        return nbt;
+    }
+
+    public static UUID uuidFromNBT(NBTTagList nbt) {
+        if (nbt.tagCount() != 2 || !(nbt.tagList.get(0) instanceof NBTTagLong)
+            || !(nbt.tagList.get(1) instanceof NBTTagLong))
+            return null;
+
+        return new UUID(
+            ((NBTTagLong) nbt.tagList.get(0)).func_150291_c(),
+            ((NBTTagLong) nbt.tagList.get(1)).func_150291_c()
+        );
+    }
+
+    /**
+     * Drops all items in the given IInventory into the world.
+     */
+    public static void dropInventoryContents(IInventory inv) {
+        TileEntity te = (TileEntity) inv;
+
+        IntStream.range(0, inv.getSizeInventory())
+            .mapToObj(inv::getStackInSlot)
+            .filter(stack -> (stack != null && stack.stackSize > 0))
+            .map(stack -> {
+                EntityItem ent = new EntityItem(
+                    te.getWorldObj(),
+                    te.xCoord + rand.nextFloat() * 0.8f + 0.1f,
+                    te.yCoord + rand.nextFloat() * 0.8f + 0.1f,
+                    te.zCoord + rand.nextFloat() * 0.8f + 0.1f,
+                    stack.copy()
+                );
+                ent.motionX = rand.nextGaussian() * 0.05f;
+                ent.motionY = rand.nextGaussian() * 0.05f + 0.2f;
+                ent.motionZ = rand.nextGaussian() * 0.05f;
+                return ent;
+            })
+            .forEach(te.getWorldObj()::spawnEntityInWorld);
+    }
 }

src/main/java/net/anvilcraft/anvillib/util/NBTCollector.java

@@ -0,0 +1,50 @@
+package net.anvilcraft.anvillib.util;
+
+import java.util.List;
+import java.util.Set;
+import java.util.function.BiConsumer;
+import java.util.function.BinaryOperator;
+import java.util.function.Function;
+import java.util.function.Supplier;
+import java.util.stream.Collector;
+
+import com.google.common.collect.ImmutableSet;
+
+import net.minecraft.nbt.NBTBase;
+import net.minecraft.nbt.NBTTagList;
+
+/**
+ * A Collector implementation for collecting into an NBTTagList
+ */
+public class NBTCollector implements Collector<NBTBase, NBTTagList, NBTTagList> {
+    @Override
+    public Supplier<NBTTagList> supplier() {
+        return NBTTagList::new;
+    }
+
+    @Override
+    public BiConsumer<NBTTagList, NBTBase> accumulator() {
+        return NBTTagList::appendTag;
+    }
+
+    @Override
+    @SuppressWarnings("unchecked")
+    public BinaryOperator<NBTTagList> combiner() {
+        return (a, b) -> {
+            for (NBTBase n : (List<? extends NBTBase>) b.tagList) {
+                a.appendTag(n);
+            }
+            return a;
+        };
+    }
+
+    @Override
+    public Function<NBTTagList, NBTTagList> finisher() {
+        return x -> x;
+    }
+
+    @Override
+    public Set<Characteristics> characteristics() {
+        return ImmutableSet.of(Characteristics.IDENTITY_FINISH);
+    }
+}

src/main/resources/META-INF/anvillib_at.cfg

@@ -1 +1,2 @@
 public net.minecraft.world.storage.SaveHandler field_75771_c # playersDirectory
+public net.minecraft.nbt.NBTTagList field_74747_a # tagList