From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
Date: Sat, 15 Jun 2024 21:42:19 -0400
Subject: [PATCH] WIP Tag API


diff --git a/src/main/java/io/papermc/paper/registry/tag/TagKey.java b/src/main/java/io/papermc/paper/registry/tag/TagKey.java
new file mode 100644
index 0000000000000000000000000000000000000000..a49d328e95f7fda6567ee6c4f5f1878a2c187277
--- /dev/null
+++ b/src/main/java/io/papermc/paper/registry/tag/TagKey.java
@@ -0,0 +1,32 @@
+package io.papermc.paper.registry.tag;
+
+import io.papermc.paper.registry.RegistryKey;
+import net.kyori.adventure.key.Key;
+import net.kyori.adventure.key.Keyed;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.Contract;
+
+@ApiStatus.Experimental
+public sealed interface TagKey<T> extends Keyed permits TagKeyImpl {
+
+    /**
+     * Creates a new tag key for a registry.
+     *
+     * @param registryKey the registry for the tag
+     * @param key the specific key for the tag
+     * @return a new tag key
+     * @param <T> the registry value type
+     */
+    @Contract(value = "_, _ -> new", pure = true)
+    static <T> @NonNull TagKey<T> create(final @NonNull RegistryKey<T> registryKey, final @NonNull Key key) {
+        return new TagKeyImpl<>(registryKey, key);
+    }
+
+    /**
+     * Get the registry key for this tag key.
+     *
+     * @return the registry key
+     */
+    @NonNull RegistryKey<T> registryKey();
+}
diff --git a/src/main/java/io/papermc/paper/registry/tag/TagKeyImpl.java b/src/main/java/io/papermc/paper/registry/tag/TagKeyImpl.java
new file mode 100644
index 0000000000000000000000000000000000000000..11d19e339c7c62f2eb4467277552c27e4e83069c
--- /dev/null
+++ b/src/main/java/io/papermc/paper/registry/tag/TagKeyImpl.java
@@ -0,0 +1,12 @@
+package io.papermc.paper.registry.tag;
+
+import io.papermc.paper.registry.RegistryKey;
+import net.kyori.adventure.key.Key;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.framework.qual.DefaultQualifier;
+import org.jetbrains.annotations.ApiStatus;
+
+@ApiStatus.Internal
+@DefaultQualifier(NonNull.class)
+record TagKeyImpl<T>(RegistryKey<T> registryKey, Key key) implements TagKey<T> {
+}