Add new overload to PersistentDataContainer#has (#7278)

Co-authored-by: u9g <winworkswow@gmail.com>
Co-authored-by: Josh Roy <joshroy126@gmail.com>

patches/api/0354-Add-new-overload-to-PersistentDataContainer-has.patch

@@ -0,0 +1,30 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: u9g <winworkswow@gmail.com>
+Date: Mon, 3 Jan 2022 23:27:21 -0500
+Subject: [PATCH] Add new overload to PersistentDataContainer#has
+
+Adds the new overload: PersistentDataContainer#has(NamespacedKey key)
+
+diff --git a/src/main/java/org/bukkit/persistence/PersistentDataContainer.java b/src/main/java/org/bukkit/persistence/PersistentDataContainer.java
+index bf2a957be52d86d07d7d303c86bd3da5fe0a16c0..eebb3da156e2d95efbe22d4afa470b977ce19f10 100644
+--- a/src/main/java/org/bukkit/persistence/PersistentDataContainer.java
++++ b/src/main/java/org/bukkit/persistence/PersistentDataContainer.java
+@@ -151,4 +151,18 @@ public interface PersistentDataContainer {
+      */
+     @NotNull
+     PersistentDataAdapterContext getAdapterContext();
++
++    // Paper start
++    /**
++     * Returns if the persistent metadata provider has metadata registered
++     * matching the provided key.
++     * 
++     * @param key the key for which existence should be checked.
++     * 
++     * @return whether the key exists
++     * 
++     * @throws NullPointerException if the key to look up is null
++     */
++    boolean has(@NotNull NamespacedKey key);
++    // Paper end
+ }

patches/server/0846-Add-new-overload-to-PersistentDataContainer-has.patch

@@ -0,0 +1,24 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: u9g <winworkswow@gmail.com>
+Date: Mon, 3 Jan 2022 23:32:42 -0500
+Subject: [PATCH] Add new overload to PersistentDataContainer#has
+
+Adds the new overload: PersistentDataContainer#has(NamespacedKey key)
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/persistence/CraftPersistentDataContainer.java b/src/main/java/org/bukkit/craftbukkit/persistence/CraftPersistentDataContainer.java
+index 2c59f09a9261a1690951161fd856a5848d9885b7..f0588bec9be09cb8273c310fb3de8bfe72dee9e5 100644
+--- a/src/main/java/org/bukkit/craftbukkit/persistence/CraftPersistentDataContainer.java
++++ b/src/main/java/org/bukkit/craftbukkit/persistence/CraftPersistentDataContainer.java
+@@ -161,5 +161,12 @@ public class CraftPersistentDataContainer implements PersistentDataContainer {
+     public void clear() {
+         this.customDataTags.clear();
+     }
++
++    @Override
++    public boolean has(NamespacedKey key) {
++        Validate.notNull(key, "The provided key for the custom value was null");
++
++        return this.customDataTags.containsKey(key.toString());
++    }
+     // Paper end
+ }