Add Registry#getTags (#11795)

paper-server/src/main/java/io/papermc/paper/registry/PaperSimpleRegistry.java

@@ -3,6 +3,7 @@ package io.papermc.paper.registry;
 import io.papermc.paper.registry.set.NamedRegistryKeySetImpl;
 import io.papermc.paper.registry.tag.Tag;
 import io.papermc.paper.registry.tag.TagKey;
+import java.util.Collection;
 import java.util.function.Predicate;
 import net.minecraft.core.HolderSet;
 import net.minecraft.core.registries.BuiltInRegistries;
@@ -51,4 +52,9 @@ public class PaperSimpleRegistry<T extends Enum<T> & Keyed, M> extends Registry.
         final HolderSet.Named<M> namedHolderSet = this.nmsRegistry.get(PaperRegistries.toNms(key)).orElseThrow();
         return new NamedRegistryKeySetImpl<>(key, namedHolderSet);
     }
+
+    @Override
+    public Collection<Tag<T>> getTags() {
+        return this.nmsRegistry.getTags().<Tag<T>>map(NamedRegistryKeySetImpl::new).toList();
+    }
 }

paper-server/src/main/java/io/papermc/paper/registry/legacy/DelayedRegistry.java

@@ -2,6 +2,7 @@ package io.papermc.paper.registry.legacy;
 
 import io.papermc.paper.registry.tag.Tag;
 import io.papermc.paper.registry.tag.TagKey;
+import java.util.Collection;
 import java.util.Iterator;
 import java.util.function.Supplier;
 import java.util.stream.Stream;
@@ -38,11 +39,6 @@ public final class DelayedRegistry<T extends Keyed, R extends Registry<T>> imple
         return this.delegate().get(key);
     }
 
-    @Override
-    public T getOrThrow(final NamespacedKey key) {
-        return this.delegate().getOrThrow(key);
-    }
-
     @Override
     public Iterator<T> iterator() {
         return this.delegate().iterator();
@@ -67,4 +63,9 @@ public final class DelayedRegistry<T extends Keyed, R extends Registry<T>> imple
     public @NonNull Tag<T> getTag(final TagKey<T> key) {
         return this.delegate().getTag(key);
     }
+
+    @Override
+    public Collection<Tag<T>> getTags() {
+        return this.delegate().getTags();
+    }
 }

paper-server/src/main/java/io/papermc/paper/registry/set/NamedRegistryKeySetImpl.java

@@ -26,6 +26,10 @@ public record NamedRegistryKeySetImpl<T extends Keyed, M>( // TODO remove Keyed
     HolderSet.Named<M> namedSet
 ) implements Tag<T>, org.bukkit.Tag<T> {
 
+    public NamedRegistryKeySetImpl(final HolderSet.Named<M> namedSet) {
+        this(PaperRegistries.fromNms(namedSet.key()), namedSet);
+    }
+
     @Override
     public @Unmodifiable Collection<TypedKey<T>> values() {
         final ImmutableList.Builder<TypedKey<T>> builder = ImmutableList.builder();