From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Sun, 3 Jan 2021 20:03:35 -0800
Subject: [PATCH] Add GameEvent tags


diff --git a/src/main/java/io/papermc/paper/CraftGameEventTag.java b/src/main/java/io/papermc/paper/CraftGameEventTag.java
new file mode 100644
index 0000000000000000000000000000000000000000..cb78a3d4e21376ea24347187478525d5f0c24079
--- /dev/null
+++ b/src/main/java/io/papermc/paper/CraftGameEventTag.java
@@ -0,0 +1,34 @@
+package io.papermc.paper;
+
+import net.minecraft.core.Registry;
+import net.minecraft.resources.ResourceKey;
+import net.minecraft.tags.TagKey;
+import org.bukkit.GameEvent;
+import org.bukkit.craftbukkit.tag.CraftTag;
+import org.bukkit.craftbukkit.util.CraftNamespacedKey;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Collections;
+import java.util.IdentityHashMap;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+public class CraftGameEventTag extends CraftTag<net.minecraft.world.level.gameevent.GameEvent, GameEvent> {
+
+    public CraftGameEventTag(net.minecraft.core.Registry<net.minecraft.world.level.gameevent.GameEvent> registry, TagKey<net.minecraft.world.level.gameevent.GameEvent> tag) {
+        super(registry, tag);
+    }
+
+    private static final Map<GameEvent, ResourceKey<net.minecraft.world.level.gameevent.GameEvent>> KEY_CACHE = Collections.synchronizedMap(new IdentityHashMap<>());
+    @Override
+    public boolean isTagged(@NotNull GameEvent gameEvent) {
+        return registry.getHolderOrThrow(KEY_CACHE.computeIfAbsent(gameEvent, event -> ResourceKey.create(Registry.GAME_EVENT_REGISTRY, CraftNamespacedKey.toMinecraft(event.getKey())))).is(tag);
+    }
+
+    @Override
+    public @NotNull Set<GameEvent> getValues() {
+        return getHandle().stream().map((nms) -> Objects.requireNonNull(GameEvent.getByKey(CraftNamespacedKey.fromMinecraft(Registry.GAME_EVENT.getKey(nms.value()))), nms + " is not a recognized game event")).collect(Collectors.toUnmodifiableSet());
+    }
+}
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index fbd4ecab83955c3c56fa076da12b28399641bd50..2e0517aa65102af5c7aef08acbc25646b1a0afd8 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -97,6 +97,7 @@ import net.minecraft.world.level.biome.BiomeSource;
 import net.minecraft.world.level.block.Block;
 import net.minecraft.world.level.dimension.DimensionType;
 import net.minecraft.world.level.dimension.LevelStem;
+import net.minecraft.world.level.gameevent.GameEvent;
 import net.minecraft.world.level.levelgen.NoiseBasedChunkGenerator;
 import net.minecraft.world.level.levelgen.PatrolSpawner;
 import net.minecraft.world.level.levelgen.PhantomSpawner;
@@ -2563,6 +2564,15 @@ public final class CraftServer implements Server {
                     return (org.bukkit.Tag<T>) new CraftEntityTag(Registry.ENTITY_TYPE, entityTagKey);
                 }
             }
+            // Paper start
+            case org.bukkit.Tag.REGISTRY_GAME_EVENTS -> {
+                Preconditions.checkArgument(clazz == org.bukkit.GameEvent.class, "Game Event namespace must have GameEvent type");
+                TagKey<GameEvent> gameEventTagKey = TagKey.create(Registry.GAME_EVENT_REGISTRY, key);
+                if (Registry.GAME_EVENT.isKnownTagName(gameEventTagKey)) {
+                    return (org.bukkit.Tag<T>) new io.papermc.paper.CraftGameEventTag(Registry.GAME_EVENT, gameEventTagKey);
+                }
+            }
+            // Paper end
             default -> throw new IllegalArgumentException();
         }
 
@@ -2595,6 +2605,13 @@ public final class CraftServer implements Server {
                 Registry<EntityType<?>> entityTags = Registry.ENTITY_TYPE;
                 return entityTags.getTags().map(pair -> (org.bukkit.Tag<T>) new CraftEntityTag(entityTags, pair.getFirst())).collect(ImmutableList.toImmutableList());
             }
+            // Paper start
+            case org.bukkit.Tag.REGISTRY_GAME_EVENTS -> {
+                Preconditions.checkArgument(clazz == org.bukkit.GameEvent.class);
+                Registry<GameEvent> gameEvents = Registry.GAME_EVENT;
+                return gameEvents.getTags().map(pair -> (org.bukkit.Tag<T>) new io.papermc.paper.CraftGameEventTag(gameEvents, pair.getFirst())).collect(ImmutableList.toImmutableList());
+            // Paper end
+            }
             default -> throw new IllegalArgumentException();
         }
     }