Add directly buildable Art

paper-api/src/main/java/io/papermc/paper/registry/data/InlinedRegistryBuilderProvider.java

@@ -0,0 +1,22 @@
+package io.papermc.paper.registry.data;
+
+import io.papermc.paper.registry.RegistryBuilderFactory;
+import java.util.Optional;
+import java.util.ServiceLoader;
+import java.util.function.Consumer;
+import org.bukkit.Art;
+import org.jetbrains.annotations.ApiStatus;
+
+@ApiStatus.Internal
+@ApiStatus.NonExtendable
+public interface InlinedRegistryBuilderProvider {
+
+    static InlinedRegistryBuilderProvider instance() {
+        class Holder {
+            static final Optional<InlinedRegistryBuilderProvider> INSTANCE = ServiceLoader.load(InlinedRegistryBuilderProvider.class).findFirst();
+        }
+        return Holder.INSTANCE.orElseThrow();
+    }
+
+    Art createPaintingVariant(Consumer<RegistryBuilderFactory<Art, ? extends PaintingVariantRegistryEntry.Builder>> value);
+}

paper-api/src/main/java/org/bukkit/Art.java

@@ -2,9 +2,14 @@ package org.bukkit;
 
 import com.google.common.base.Preconditions;
 import com.google.common.collect.Lists;
+import io.papermc.paper.registry.RegistryBuilderFactory;
+import io.papermc.paper.registry.data.InlinedRegistryBuilderProvider;
+import io.papermc.paper.registry.data.PaintingVariantRegistryEntry;
 import java.util.Locale;
+import java.util.function.Consumer;
 import org.bukkit.packs.DataPack;
 import org.bukkit.util.OldEnum;
+import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
@@ -18,6 +23,17 @@ import org.jetbrains.annotations.Nullable;
  */
 public interface Art extends OldEnum<Art>, Keyed {
 
+    /**
+     * Create an inlined painting variant.
+     *
+     * @param value a consumer for the builder factory
+     * @return the created painting variant
+     */
+    @ApiStatus.Experimental
+    static @NotNull Art create(final Consumer<RegistryBuilderFactory<Art, ? extends PaintingVariantRegistryEntry.Builder>> value) {
+        return InlinedRegistryBuilderProvider.instance().createPaintingVariant(value);
+    }
+
     Art KEBAB = getArt("kebab");
     Art AZTEC = getArt("aztec");
     Art ALBAN = getArt("alban");

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

@@ -8,6 +8,7 @@ import io.papermc.paper.registry.data.PaperEnchantmentRegistryEntry;
 import io.papermc.paper.registry.data.PaperGameEventRegistryEntry;
 import io.papermc.paper.registry.data.PaperPaintingVariantRegistryEntry;
 import io.papermc.paper.registry.entry.RegistryEntry;
+import io.papermc.paper.registry.entry.RegistryEntryMeta;
 import io.papermc.paper.registry.tag.TagKey;
 import java.util.Collections;
 import java.util.IdentityHashMap;
@@ -136,6 +137,18 @@ public final class PaperRegistries {
         return (RegistryEntry<M, T>) BY_REGISTRY_KEY.get(registryKey);
     }
 
+    @SuppressWarnings("unchecked")
+    public static <M, T extends Keyed, B extends PaperRegistryBuilder<M, T>> RegistryEntryMeta.Buildable<M, T, B> getBuildableMeta(final ResourceKey<? extends Registry<M>> resourceKey) {
+        final RegistryEntry<M, T> entry = getEntry(resourceKey);
+        if (entry == null) {
+            throw new IllegalArgumentException("No registry entry for " + resourceKey);
+        }
+        if (!(entry.meta() instanceof final RegistryEntryMeta.Buildable<M, T, ?> buildableMeta)) {
+            throw new IllegalArgumentException("Registry entry for " + resourceKey + " is not buildable");
+        }
+        return (RegistryEntryMeta.Buildable<M, T, B>) buildableMeta;
+    }
+
     @SuppressWarnings("unchecked")
     public static <M, T> RegistryKey<T> registryFromNms(final ResourceKey<? extends Registry<M>> registryResourceKey) {
         return (RegistryKey<T>) Objects.requireNonNull(BY_RESOURCE_KEY.get(registryResourceKey), registryResourceKey + " doesn't have an api RegistryKey").apiKey();

paper-server/src/main/java/io/papermc/paper/registry/data/InlinedRegistryBuilderProviderImpl.java

@@ -0,0 +1,34 @@
+package io.papermc.paper.registry.data;
+
+import com.google.common.base.Preconditions;
+import io.papermc.paper.registry.PaperRegistries;
+import io.papermc.paper.registry.PaperRegistryBuilder;
+import io.papermc.paper.registry.PaperRegistryBuilderFactory;
+import io.papermc.paper.registry.RegistryBuilderFactory;
+import io.papermc.paper.registry.data.util.Conversions;
+import io.papermc.paper.registry.entry.RegistryEntryMeta;
+import java.util.function.Consumer;
+import net.minecraft.core.Holder;
+import net.minecraft.core.Registry;
+import net.minecraft.core.registries.Registries;
+import net.minecraft.resources.ResourceKey;
+import org.bukkit.Art;
+import org.bukkit.Keyed;
+import org.bukkit.craftbukkit.CraftRegistry;
+
+@SuppressWarnings("BoundedWildcard")
+public final class InlinedRegistryBuilderProviderImpl implements InlinedRegistryBuilderProvider {
+
+    private static <M, A extends Keyed, B extends PaperRegistryBuilder<M, A>> A create(final ResourceKey<? extends Registry<M>> registryKey, final Consumer<PaperRegistryBuilderFactory<M, A, B>> value) {
+        final RegistryEntryMeta.Buildable<M, A, B> buildableMeta = PaperRegistries.getBuildableMeta(registryKey);
+        Preconditions.checkArgument(buildableMeta.registryTypeMapper().supportsDirectHolders(), "Registry type mapper must support direct holders");
+        final PaperRegistryBuilderFactory<M, A, B> builderFactory = new PaperRegistryBuilderFactory<>(Conversions.global(), buildableMeta.builderFiller(), CraftRegistry.getMinecraftRegistry(buildableMeta.mcKey())::getValue);
+        value.accept(builderFactory);
+        return buildableMeta.registryTypeMapper().convertDirectHolder(Holder.direct(builderFactory.requireBuilder().build()));
+    }
+
+    @Override
+    public Art createPaintingVariant(final Consumer<RegistryBuilderFactory<Art, ? extends PaintingVariantRegistryEntry.Builder>> value) {
+        return create(Registries.PAINTING_VARIANT, value::accept);
+    }
+}

paper-server/src/main/java/org/bukkit/craftbukkit/CraftRegistry.java

@@ -78,7 +78,7 @@ public class CraftRegistry<B extends Keyed, M> implements Registry<B> {
         return CraftRegistry.registry;
     }
 
-    public static <E> net.minecraft.core.Registry<E> getMinecraftRegistry(ResourceKey<net.minecraft.core.Registry<E>> key) {
+    public static <E> net.minecraft.core.Registry<E> getMinecraftRegistry(ResourceKey<? extends net.minecraft.core.Registry<E>> key) {
         return CraftRegistry.getMinecraftRegistry().lookupOrThrow(key);
     }
 

paper-server/src/main/resources/META-INF/services/io.papermc.paper.registry.data.InlinedRegistryBuilderProvider

@@ -0,0 +1 @@
+io.papermc.paper.registry.data.InlinedRegistryBuilderProviderImpl