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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Wed, 2 Mar 2022 13:36:21 -0800
Subject: [PATCH] Add PaperRegistry
diff --git a/src/main/java/io/papermc/paper/registry/Reference.java b/src/main/java/io/papermc/paper/registry/Reference.java
new file mode 100644
index 0000000000000000000000000000000000000000..d880810cbf05bc45051fe29515054211572e33b4
--- /dev/null
+++ b/src/main/java/io/papermc/paper/registry/Reference.java
@@ -0,0 +1,43 @@
+package io.papermc.paper.registry;
+
+import org.bukkit.Keyed;
+import org.bukkit.NamespacedKey;
+import org.bukkit.Registry;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Represents a reference to a server-backed registry value that may
+ * change.
+ *
+ * @param <T> type of the value
+ */
+public interface Reference<T extends Keyed> extends Keyed {
+
+ /**
+ * Gets the value from the registry with the key.
+ *
+ * @return the value
+ * @throws java.util.NoSuchElementException if there is no value with this key
+ */
+ @NotNull T value();
+
+ /**
+ * Gets the value from the registry with the key.
+ *
+ * @return the value or null if it doesn't exist
+ */
+ @Nullable T valueOrNull();
+
+ /**
+ * Creates a reference to a registered value.
+ *
+ * @param registry the registry the value is located in
+ * @param key the key to the value
+ * @param <T> the type of the value
+ * @return a reference
+ */
+ static <T extends Keyed> @NotNull Reference<T> create(@NotNull Registry<T> registry, @NotNull NamespacedKey key) {
+ return new ReferenceImpl<>(registry, key);
+ }
+}
diff --git a/src/main/java/io/papermc/paper/registry/ReferenceImpl.java b/src/main/java/io/papermc/paper/registry/ReferenceImpl.java
new file mode 100644
index 0000000000000000000000000000000000000000..f29e76a6b66ddfec12ddf8db6dcb2df6083b5982
--- /dev/null
+++ b/src/main/java/io/papermc/paper/registry/ReferenceImpl.java
@@ -0,0 +1,31 @@
+package io.papermc.paper.registry;
+
+import org.bukkit.Keyed;
+import org.bukkit.NamespacedKey;
+import org.bukkit.Registry;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.NoSuchElementException;
+
+record ReferenceImpl<T extends Keyed>(@NotNull Registry<T> registry, @NotNull NamespacedKey key) implements Reference<T> {
+
+ @Override
+ public @NotNull T value() {
+ final T value = this.registry.get(this.key);
+ if (value == null) {
+ throw new NoSuchElementException("No such value with key " + this.key);
+ }
+ return value;
+ }
+
+ @Override
+ public @Nullable T valueOrNull() {
+ return this.registry.get(this.key);
+ }
+
+ @Override
+ public @NotNull NamespacedKey getKey() {
+ return this.key;
+ }
+}
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