Support spawning item stacks

Spigot-API-Patches/Mob-Spawner-API-Enhancements.patch

@@ -25,5 +25,17 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * Resets the spawn delay timer within the min/max range
 +     */
 +    public void resetTimer();
++
++    /**
++     * Sets the {@link EntityType} to {@link EntityType#DROPPED_ITEM} and sets the data to the given
++     * {@link org.bukkit.inventory.ItemStack ItemStack}.
++     * <p>
++     * {@link #setSpawnCount(int)} does not dictate the amount of items in the stack spawned, but rather how many
++     * stacks should be spawned.
++     *
++     * @param itemStack The item to spawn. Must not {@link org.bukkit.Material#isAir be air}.
++     * @see #setSpawnedType(EntityType)
++     */
++    void setSpawnedItem(@NotNull org.bukkit.inventory.ItemStack itemStack);
 +    // Paper end
  }

Spigot-Server-Patches/Mob-Spawner-API-Enhancements.patch

@@ -85,6 +85,21 @@ diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftCreatureSpawner.jav
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
 --- a/src/main/java/org/bukkit/craftbukkit/block/CraftCreatureSpawner.java
 +++ b/src/main/java/org/bukkit/craftbukkit/block/CraftCreatureSpawner.java
+@@ -0,0 +0,0 @@ import org.bukkit.Material;
+ import org.bukkit.block.Block;
+ import org.bukkit.block.CreatureSpawner;
+ import org.bukkit.entity.EntityType;
++// Paper start
++import net.minecraft.server.IRegistry;
++import net.minecraft.server.MobSpawnerData;
++import net.minecraft.server.NBTTagCompound;
++import org.bukkit.craftbukkit.inventory.CraftItemStack;
++import org.bukkit.craftbukkit.util.CraftMagicNumbers;
++import org.bukkit.inventory.ItemStack;
++// Paper end
+ 
+ public class CraftCreatureSpawner extends CraftBlockEntityState<TileEntityMobSpawner> implements CreatureSpawner {
+ 
 @@ -0,0 +0,0 @@ public class CraftCreatureSpawner extends CraftBlockEntityState<TileEntityMobSpa
      public void setSpawnRange(int spawnRange) {
          this.getSnapshot().getSpawner().spawnRange = spawnRange;
@@ -100,5 +115,19 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    public void resetTimer() {
 +        this.getSnapshot().getSpawner().resetTimer();
 +    }
++
++    @Override
++    public void setSpawnedItem(ItemStack itemStack) {
++        Preconditions.checkArgument(itemStack != null && !itemStack.getType().isAir(), "spawners cannot spawn air");
++        net.minecraft.server.ItemStack item = CraftItemStack.asNMSCopy(itemStack);
++        NBTTagCompound compound = new NBTTagCompound();
++        NBTTagCompound entity = new NBTTagCompound();
++        entity.setString("id", IRegistry.ENTITY_TYPE.getKey(EntityTypes.ITEM).toString());
++        entity.set("Item", item.save(new NBTTagCompound()));
++        compound.set("Entity", entity);
++        compound.setInt("Weight", this.getSnapshotNBT().hasKeyOfType("Weight", CraftMagicNumbers.NBT.TAG_ANY_NUMBER) ? this.getSnapshotNBT().getInt("Weight") : 1);
++        this.getSnapshot().getSpawner().setSpawnData(new MobSpawnerData(compound));
++        this.getSnapshot().getSpawner().mobs.clear();
++    }
 +    // Paper end
  }