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Paper/patches/api/0471-Registry-Modification-API.patch
Jake Potrebic 860d948731
Support tags for more SimpleRegistry (#11607)
2024-11-23 20:26:51 +01:00

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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] Registry Modification API
diff --git a/src/main/java/io/papermc/paper/registry/RegistryBuilder.java b/src/main/java/io/papermc/paper/registry/RegistryBuilder.java
new file mode 100644
index 0000000000000000000000000000000000000000..379e2638aca243bacac777cf59982f9d0e601f3e
--- /dev/null
+++ b/src/main/java/io/papermc/paper/registry/RegistryBuilder.java
@@ -0,0 +1,15 @@
+package io.papermc.paper.registry;
+
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * To be implemented by any type used for modifying registries.
+ *
+ * @param <T> registry value type
+ */
+@ApiStatus.Experimental
+@NullMarked
+@ApiStatus.NonExtendable
+public interface RegistryBuilder<T> {
+}
diff --git a/src/main/java/io/papermc/paper/registry/event/RegistryEntryAddEvent.java b/src/main/java/io/papermc/paper/registry/event/RegistryEntryAddEvent.java
new file mode 100644
index 0000000000000000000000000000000000000000..56468b311e40a6d1aa03c6d31328952b92e95027
--- /dev/null
+++ b/src/main/java/io/papermc/paper/registry/event/RegistryEntryAddEvent.java
@@ -0,0 +1,48 @@
+package io.papermc.paper.registry.event;
+
+import io.papermc.paper.registry.RegistryBuilder;
+import io.papermc.paper.registry.TypedKey;
+import io.papermc.paper.registry.tag.Tag;
+import io.papermc.paper.registry.tag.TagKey;
+import org.bukkit.Keyed;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * Event object for {@link RegistryEventProvider#entryAdd()}. This
+ * event is fired right before a specific entry is registered in/added to registry.
+ * It provides a way for plugins to modify parts of this entry.
+ *
+ * @param <T> registry entry type
+ * @param <B> registry entry builder type
+ */
+@ApiStatus.Experimental
+@NullMarked
+@ApiStatus.NonExtendable
+public interface RegistryEntryAddEvent<T, B extends RegistryBuilder<T>> extends RegistryEvent<T> {
+
+ /**
+ * Gets the builder for the entry being added to the registry.
+ *
+ * @return the object builder
+ */
+ B builder();
+
+ /**
+ * Gets the key for this entry in the registry.
+ *
+ * @return the key
+ */
+ TypedKey<T> key();
+
+ /**
+ * Gets or creates a tag for the given tag key. This tag
+ * is then required to be filled either from the built-in or
+ * custom datapack.
+ *
+ * @param tagKey the tag key
+ * @return the tag
+ * @param <V> the tag value type
+ */
+ <V extends Keyed> Tag<V> getOrCreateTag(TagKey<V> tagKey);
+}
diff --git a/src/main/java/io/papermc/paper/registry/event/RegistryEvent.java b/src/main/java/io/papermc/paper/registry/event/RegistryEvent.java
new file mode 100644
index 0000000000000000000000000000000000000000..3a8643c06d751bf3e4bff4d95b62c675ecdf0f16
--- /dev/null
+++ b/src/main/java/io/papermc/paper/registry/event/RegistryEvent.java
@@ -0,0 +1,24 @@
+package io.papermc.paper.registry.event;
+
+import io.papermc.paper.plugin.lifecycle.event.LifecycleEvent;
+import io.papermc.paper.registry.RegistryKey;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * Base type for all registry events.
+ *
+ * @param <T> registry entry type
+ */
+@ApiStatus.Experimental
+@NullMarked
+@ApiStatus.NonExtendable
+public interface RegistryEvent<T> extends LifecycleEvent {
+
+ /**
+ * Get the key for the registry this event pertains to.
+ *
+ * @return the registry key
+ */
+ RegistryKey<T> registryKey();
+}
diff --git a/src/main/java/io/papermc/paper/registry/event/RegistryEventProvider.java b/src/main/java/io/papermc/paper/registry/event/RegistryEventProvider.java
new file mode 100644
index 0000000000000000000000000000000000000000..8518e93829318cbfe0eb70f558cb86a7b5742514
--- /dev/null
+++ b/src/main/java/io/papermc/paper/registry/event/RegistryEventProvider.java
@@ -0,0 +1,57 @@
+package io.papermc.paper.registry.event;
+
+import io.papermc.paper.plugin.bootstrap.BootstrapContext;
+import io.papermc.paper.plugin.lifecycle.event.handler.LifecycleEventHandler;
+import io.papermc.paper.plugin.lifecycle.event.types.LifecycleEventType;
+import io.papermc.paper.registry.RegistryBuilder;
+import io.papermc.paper.registry.RegistryKey;
+import io.papermc.paper.registry.event.type.RegistryEntryAddEventType;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * Provider for registry events for a specific registry.
+ * <p>
+ * Supported events are:
+ * <ul>
+ * <li>{@link RegistryEntryAddEvent} (via {@link #entryAdd()})</li>
+ * <li>{@link RegistryFreezeEvent} (via {@link #freeze()})</li>
+ * </ul>
+ *
+ * @param <T> registry entry type
+ * @param <B> registry entry builder type
+ */
+@ApiStatus.Experimental
+@NullMarked
+@ApiStatus.NonExtendable
+public interface RegistryEventProvider<T, B extends RegistryBuilder<T>> {
+
+ /**
+ * Gets the event type for {@link RegistryEntryAddEvent} which is fired just before
+ * an object is added to a registry.
+ * <p>
+ * Can be used in {@link io.papermc.paper.plugin.lifecycle.event.LifecycleEventManager#registerEventHandler(LifecycleEventType, LifecycleEventHandler)}
+ * to register a handler for {@link RegistryEntryAddEvent}.
+ *
+ * @return the registry entry add event type
+ */
+ RegistryEntryAddEventType<T, B> entryAdd();
+
+ /**
+ * Gets the event type for {@link RegistryFreezeEvent} which is fired just before
+ * a registry is frozen. It allows for the registration of new objects.
+ * <p>
+ * Can be used in {@link io.papermc.paper.plugin.lifecycle.event.LifecycleEventManager#registerEventHandler(LifecycleEventType, LifecycleEventHandler)}
+ * to register a handler for {@link RegistryFreezeEvent}.
+ *
+ * @return the registry freeze event type
+ */
+ LifecycleEventType.Prioritizable<BootstrapContext, RegistryFreezeEvent<T, B>> freeze();
+
+ /**
+ * Gets the registry key associated with this event type provider.
+ *
+ * @return the registry key
+ */
+ RegistryKey<T> registryKey();
+}
diff --git a/src/main/java/io/papermc/paper/registry/event/RegistryEventProviderImpl.java b/src/main/java/io/papermc/paper/registry/event/RegistryEventProviderImpl.java
new file mode 100644
index 0000000000000000000000000000000000000000..8d9afd49077090d30f13b217b71100c73137d120
--- /dev/null
+++ b/src/main/java/io/papermc/paper/registry/event/RegistryEventProviderImpl.java
@@ -0,0 +1,29 @@
+package io.papermc.paper.registry.event;
+
+import io.papermc.paper.plugin.bootstrap.BootstrapContext;
+import io.papermc.paper.plugin.lifecycle.event.types.LifecycleEventType;
+import io.papermc.paper.registry.RegistryBuilder;
+import io.papermc.paper.registry.RegistryKey;
+import io.papermc.paper.registry.event.type.RegistryEntryAddEventType;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+
+@ApiStatus.Internal
+@NullMarked
+record RegistryEventProviderImpl<T, B extends RegistryBuilder<T>>(RegistryKey<T> registryKey) implements RegistryEventProvider<T, B> {
+
+ static <T, B extends RegistryBuilder<T>> RegistryEventProvider<T, B> create(final RegistryKey<T> registryKey) {
+ return new RegistryEventProviderImpl<>(registryKey);
+ }
+
+ @Override
+ public RegistryEntryAddEventType<T, B> entryAdd() {
+ return RegistryEventTypeProvider.provider().registryEntryAdd(this);
+ }
+
+ @Override
+ public LifecycleEventType.Prioritizable<BootstrapContext, RegistryFreezeEvent<T, B>> freeze() {
+ return RegistryEventTypeProvider.provider().registryFreeze(this);
+ }
+
+}
diff --git a/src/main/java/io/papermc/paper/registry/event/RegistryEventTypeProvider.java b/src/main/java/io/papermc/paper/registry/event/RegistryEventTypeProvider.java
new file mode 100644
index 0000000000000000000000000000000000000000..d807bd2f42c98e37a96cf110ad77820dfffc8398
--- /dev/null
+++ b/src/main/java/io/papermc/paper/registry/event/RegistryEventTypeProvider.java
@@ -0,0 +1,24 @@
+package io.papermc.paper.registry.event;
+
+import io.papermc.paper.plugin.bootstrap.BootstrapContext;
+import io.papermc.paper.plugin.lifecycle.event.types.LifecycleEventType;
+import io.papermc.paper.registry.RegistryBuilder;
+import io.papermc.paper.registry.event.type.RegistryEntryAddEventType;
+import java.util.Optional;
+import java.util.ServiceLoader;
+import org.jetbrains.annotations.ApiStatus;
+
+@ApiStatus.Internal
+interface RegistryEventTypeProvider {
+
+ Optional<RegistryEventTypeProvider> PROVIDER = ServiceLoader.load(RegistryEventTypeProvider.class)
+ .findFirst();
+
+ static RegistryEventTypeProvider provider() {
+ return PROVIDER.orElseThrow(() -> new IllegalStateException("Could not find a %s service implementation".formatted(RegistryEventTypeProvider.class.getSimpleName())));
+ }
+
+ <T, B extends RegistryBuilder<T>> RegistryEntryAddEventType<T, B> registryEntryAdd(RegistryEventProvider<T, B> type);
+
+ <T, B extends RegistryBuilder<T>> LifecycleEventType.Prioritizable<BootstrapContext, RegistryFreezeEvent<T, B>> registryFreeze(RegistryEventProvider<T, B> type);
+}
diff --git a/src/main/java/io/papermc/paper/registry/event/RegistryEvents.java b/src/main/java/io/papermc/paper/registry/event/RegistryEvents.java
new file mode 100644
index 0000000000000000000000000000000000000000..91ae9c0d3ec55ce417d4b447bf3d1b0d0c174b5e
--- /dev/null
+++ b/src/main/java/io/papermc/paper/registry/event/RegistryEvents.java
@@ -0,0 +1,16 @@
+package io.papermc.paper.registry.event;
+
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * Holds providers for {@link RegistryEntryAddEvent} and {@link RegistryFreezeEvent}
+ * handlers for each applicable registry.
+ */
+@ApiStatus.Experimental
+@NullMarked
+public final class RegistryEvents {
+
+ private RegistryEvents() {
+ }
+}
diff --git a/src/main/java/io/papermc/paper/registry/event/RegistryFreezeEvent.java b/src/main/java/io/papermc/paper/registry/event/RegistryFreezeEvent.java
new file mode 100644
index 0000000000000000000000000000000000000000..59e8ca6c5b7fa0424ad9b2c74545ec53444b5fcb
--- /dev/null
+++ b/src/main/java/io/papermc/paper/registry/event/RegistryFreezeEvent.java
@@ -0,0 +1,40 @@
+package io.papermc.paper.registry.event;
+
+import io.papermc.paper.registry.RegistryBuilder;
+import io.papermc.paper.registry.tag.Tag;
+import io.papermc.paper.registry.tag.TagKey;
+import org.bukkit.Keyed;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * Event object for {@link RegistryEventProvider#freeze()}. This
+ * event is fired right before a registry is frozen disallowing further changes.
+ * It provides a way for plugins to add new objects to the registry.
+ *
+ * @param <T> registry entry type
+ * @param <B> registry entry builder type
+ */
+@ApiStatus.Experimental
+@NullMarked
+@ApiStatus.NonExtendable
+public interface RegistryFreezeEvent<T, B extends RegistryBuilder<T>> extends RegistryEvent<T> {
+
+ /**
+ * Get the writable registry.
+ *
+ * @return a writable registry
+ */
+ WritableRegistry<T, B> registry();
+
+ /**
+ * Gets or creates a tag for the given tag key. This tag
+ * is then required to be filled either from the built-in or
+ * custom datapack.
+ *
+ * @param tagKey the tag key
+ * @return the tag
+ * @param <V> the tag value type
+ */
+ <V extends Keyed> Tag<V> getOrCreateTag(TagKey<V> tagKey);
+}
diff --git a/src/main/java/io/papermc/paper/registry/event/WritableRegistry.java b/src/main/java/io/papermc/paper/registry/event/WritableRegistry.java
new file mode 100644
index 0000000000000000000000000000000000000000..744f455b14cdc9131497024088da4ca0e8fc39dc
--- /dev/null
+++ b/src/main/java/io/papermc/paper/registry/event/WritableRegistry.java
@@ -0,0 +1,28 @@
+package io.papermc.paper.registry.event;
+
+import io.papermc.paper.registry.RegistryBuilder;
+import io.papermc.paper.registry.TypedKey;
+import java.util.function.Consumer;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * A registry which supports registering new objects.
+ *
+ * @param <T> registry entry type
+ * @param <B> registry entry builder type
+ */
+@ApiStatus.Experimental
+@NullMarked
+@ApiStatus.NonExtendable
+public interface WritableRegistry<T, B extends RegistryBuilder<T>> {
+
+ /**
+ * Register a new value with the specified key. This will
+ * fire a {@link RegistryEntryAddEvent} for the new entry.
+ *
+ * @param key the entry's key (must be unique from others)
+ * @param value a consumer for the entry's builder
+ */
+ void register(TypedKey<T> key, Consumer<? super B> value);
+}
diff --git a/src/main/java/io/papermc/paper/registry/event/type/RegistryEntryAddConfiguration.java b/src/main/java/io/papermc/paper/registry/event/type/RegistryEntryAddConfiguration.java
new file mode 100644
index 0000000000000000000000000000000000000000..d9bde790f74982c6cd5870aee35fec8a0c49fc83
--- /dev/null
+++ b/src/main/java/io/papermc/paper/registry/event/type/RegistryEntryAddConfiguration.java
@@ -0,0 +1,43 @@
+package io.papermc.paper.registry.event.type;
+
+import io.papermc.paper.plugin.bootstrap.BootstrapContext;
+import io.papermc.paper.plugin.lifecycle.event.handler.configuration.PrioritizedLifecycleEventHandlerConfiguration;
+import io.papermc.paper.registry.TypedKey;
+import java.util.function.Predicate;
+import org.jetbrains.annotations.Contract;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * Specific configuration for {@link io.papermc.paper.registry.event.RegistryEntryAddEvent}s.
+ *
+ * @param <T> registry entry type
+ */
+@NullMarked
+public interface RegistryEntryAddConfiguration<T> extends PrioritizedLifecycleEventHandlerConfiguration<BootstrapContext> {
+
+ /**
+ * Only call the handler if the value being added matches the specified key.
+ *
+ * @param key the key to match
+ * @return this configuration
+ */
+ @Contract(value = "_ -> this", mutates = "this")
+ default RegistryEntryAddConfiguration<T> filter(final TypedKey<T> key) {
+ return this.filter(key::equals);
+ }
+
+ /**
+ * Only call the handler if the value being added passes the provided filter.
+ *
+ * @param filter the predicate to match the key against
+ * @return this configuration
+ */
+ @Contract(value = "_ -> this", mutates = "this")
+ RegistryEntryAddConfiguration<T> filter(Predicate<TypedKey<T>> filter);
+
+ @Override
+ RegistryEntryAddConfiguration<T> priority(int priority);
+
+ @Override
+ RegistryEntryAddConfiguration<T> monitor();
+}
diff --git a/src/main/java/io/papermc/paper/registry/event/type/RegistryEntryAddEventType.java b/src/main/java/io/papermc/paper/registry/event/type/RegistryEntryAddEventType.java
new file mode 100644
index 0000000000000000000000000000000000000000..93447ef58933f37fe12c4507c9a0b233be4c6c0b
--- /dev/null
+++ b/src/main/java/io/papermc/paper/registry/event/type/RegistryEntryAddEventType.java
@@ -0,0 +1,20 @@
+package io.papermc.paper.registry.event.type;
+
+import io.papermc.paper.plugin.bootstrap.BootstrapContext;
+import io.papermc.paper.plugin.lifecycle.event.types.LifecycleEventType;
+import io.papermc.paper.registry.RegistryBuilder;
+import io.papermc.paper.registry.event.RegistryEntryAddEvent;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * Lifecycle event type for {@link RegistryEntryAddEvent}s.
+ *
+ * @param <T> registry entry type
+ * @param <B> registry entry builder type
+ */
+@ApiStatus.Experimental
+@NullMarked
+@ApiStatus.NonExtendable
+public interface RegistryEntryAddEventType<T, B extends RegistryBuilder<T>> extends LifecycleEventType<BootstrapContext, RegistryEntryAddEvent<T, B>, RegistryEntryAddConfiguration<T>> {
+}
diff --git a/src/main/java/io/papermc/paper/registry/set/RegistryKeySet.java b/src/main/java/io/papermc/paper/registry/set/RegistryKeySet.java
new file mode 100644
index 0000000000000000000000000000000000000000..d5a5e332abc861d8509a5df7b57319f72e6b5449
--- /dev/null
+++ b/src/main/java/io/papermc/paper/registry/set/RegistryKeySet.java
@@ -0,0 +1,51 @@
+package io.papermc.paper.registry.set;
+
+import io.papermc.paper.registry.TypedKey;
+import java.util.Collection;
+import java.util.Iterator;
+import org.bukkit.Keyed;
+import org.bukkit.Registry;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.Unmodifiable;
+import org.jspecify.annotations.NullMarked;
+
+@ApiStatus.Experimental
+@NullMarked
+@ApiStatus.NonExtendable
+public non-sealed interface RegistryKeySet<T extends Keyed> extends Iterable<TypedKey<T>>, RegistrySet<T> { // TODO remove Keyed
+
+ @Override
+ default int size() {
+ return this.values().size();
+ }
+
+ /**
+ * Get the keys for the values in this set.
+ *
+ * @return the keys
+ */
+ @Unmodifiable Collection<TypedKey<T>> values();
+
+ /**
+ * Resolve this set into a collection of values. Prefer using
+ * {@link #values()}.
+ *
+ * @param registry the registry to resolve the values from (must match {@link #registryKey()})
+ * @return the resolved values
+ * @see RegistryKeySet#values()
+ */
+ @Unmodifiable Collection<T> resolve(final Registry<T> registry);
+
+ /**
+ * Checks if this set contains the value with the given key.
+ *
+ * @param valueKey the key to check
+ * @return true if the value is in this set
+ */
+ boolean contains(TypedKey<T> valueKey);
+
+ @Override
+ default Iterator<TypedKey<T>> iterator() {
+ return this.values().iterator();
+ }
+}
diff --git a/src/main/java/io/papermc/paper/registry/set/RegistryKeySetImpl.java b/src/main/java/io/papermc/paper/registry/set/RegistryKeySetImpl.java
new file mode 100644
index 0000000000000000000000000000000000000000..fe4a0817d7ac4a9f958a6156d6ae3ac1c96f58cd
--- /dev/null
+++ b/src/main/java/io/papermc/paper/registry/set/RegistryKeySetImpl.java
@@ -0,0 +1,52 @@
+package io.papermc.paper.registry.set;
+
+import com.google.common.base.Preconditions;
+import io.papermc.paper.registry.RegistryAccess;
+import io.papermc.paper.registry.RegistryKey;
+import io.papermc.paper.registry.TypedKey;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.List;
+import org.bukkit.Keyed;
+import org.bukkit.NamespacedKey;
+import org.bukkit.Registry;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.Nullable;
+
+@ApiStatus.Internal
+@NullMarked
+record RegistryKeySetImpl<T extends @Nullable Keyed>(RegistryKey<T> registryKey, List<TypedKey<T>> values) implements RegistryKeySet<T> { // TODO remove Keyed
+
+ static <T extends Keyed> RegistryKeySet<T> create(final RegistryKey<T> registryKey, final Iterable<? extends T> values) { // TODO remove Keyed
+ final Registry<T> registry = RegistryAccess.registryAccess().getRegistry(registryKey);
+ final ArrayList<TypedKey<T>> keys = new ArrayList<>();
+ for (final T value : values) {
+ final NamespacedKey key = registry.getKey(value);
+ Preconditions.checkArgument(key != null, value + " does not have a key in " + registryKey);
+ keys.add(TypedKey.create(registryKey, key));
+ }
+ return new RegistryKeySetImpl<>(registryKey, keys);
+ }
+
+ RegistryKeySetImpl {
+ values = List.copyOf(values);
+ }
+
+ @Override
+ public boolean contains(final TypedKey<T> valueKey) {
+ return this.values.contains(valueKey);
+ }
+
+ @Override
+ public Collection<T> resolve(final Registry<T> registry) {
+ final List<T> values = new ArrayList<>(this.values.size());
+ for (final TypedKey<T> key : this.values) {
+ final T value = registry.get(key.key());
+ Preconditions.checkState(value != null, "Trying to access unbound TypedKey: " + key);
+ values.add(value);
+ }
+ return Collections.unmodifiableList(values);
+ }
+}
diff --git a/src/main/java/io/papermc/paper/registry/set/RegistrySet.java b/src/main/java/io/papermc/paper/registry/set/RegistrySet.java
new file mode 100644
index 0000000000000000000000000000000000000000..c6fdeb05242418d20472aeed8cb61bfe937911c8
--- /dev/null
+++ b/src/main/java/io/papermc/paper/registry/set/RegistrySet.java
@@ -0,0 +1,113 @@
+package io.papermc.paper.registry.set;
+
+import com.google.common.collect.Lists;
+import io.papermc.paper.registry.RegistryKey;
+import io.papermc.paper.registry.TypedKey;
+import io.papermc.paper.registry.tag.Tag;
+import org.bukkit.Keyed;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.Contract;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * Represents a collection tied to a registry.
+ * <p>
+ * There are 2<!--3--> types of registry sets:
+ * <ul>
+ * <li>{@link Tag} which is a tag from vanilla or a datapack.
+ * These are obtained via {@link org.bukkit.Registry#getTag(io.papermc.paper.registry.tag.TagKey)}.</li>
+ * <li>{@link RegistryKeySet} which is a set of of keys linked to values that are present in the registry. These are
+ * created via {@link #keySet(RegistryKey, Iterable)} or {@link #keySetFromValues(RegistryKey, Iterable)}.</li>
+ * <!-- <li>{@link RegistryValueSet} which is a set of values which are anonymous (don't have keys in the registry). These are
+ * created via {@link #valueSet(RegistryKey, Iterable)}.</li>-->
+ * </ul>
+ *
+ * @param <T> registry value type
+ */
+@ApiStatus.Experimental
+@NullMarked
+public sealed interface RegistrySet<T> permits RegistryKeySet, RegistryValueSet {
+
+ // TODO uncomment when direct holder sets need to be exposed to the API
+ // /**
+ // * Creates a {@link RegistryValueSet} from anonymous values.
+ // * <p>All values provided <b>must not</b> have keys in the given registry.</p>
+ // *
+ // * @param registryKey the registry key for the type of these values
+ // * @param values the values
+ // * @return a new registry set
+ // * @param <T> the type of the values
+ // */
+ // @Contract(value = "_, _ -> new", pure = true)
+ // static <T> RegistryValueSet<T> valueSet(final RegistryKey<T> registryKey, final Iterable<? extends T> values) {
+ // return RegistryValueSetImpl.create(registryKey, values);
+ // }
+
+ /**
+ * Creates a {@link RegistryKeySet} from registry-backed values.
+ * <p>All values provided <b>must</b> have keys in the given registry.
+ * <!--For anonymous values, use {@link #valueSet(RegistryKey, Iterable)}--></p>
+ * <p>If references to actual objects are not available yet, use {@link #keySet(RegistryKey, Iterable)} to
+ * create an equivalent {@link RegistryKeySet} using just {@link TypedKey TypedKeys}.</p>
+ *
+ * @param registryKey the registry key for the owner of these values
+ * @param values the values
+ * @return a new registry set
+ * @param <T> the type of the values
+ * @throws IllegalArgumentException if the registry isn't available yet or if any value doesn't have a key in that registry
+ */
+ @Contract(value = "_, _ -> new", pure = true)
+ static <T extends Keyed> RegistryKeySet<T> keySetFromValues(final RegistryKey<T> registryKey, final Iterable<? extends T> values) { // TODO remove Keyed
+ return RegistryKeySetImpl.create(registryKey, values);
+ }
+
+ /**
+ * Creates a direct {@link RegistrySet} from {@link TypedKey TypedKeys}.
+ *
+ * @param registryKey the registry key for the owner of these keys
+ * @param keys the keys for the values
+ * @return a new registry set
+ * @param <T> the type of the values
+ */
+ @SafeVarargs
+ static <T extends Keyed> RegistryKeySet<T> keySet(final RegistryKey<T> registryKey, final TypedKey<T>... keys) { // TODO remove Keyed
+ return keySet(registryKey, Lists.newArrayList(keys));
+ }
+
+ /**
+ * Creates a direct {@link RegistrySet} from {@link TypedKey TypedKeys}.
+ *
+ * @param registryKey the registry key for the owner of these keys
+ * @param keys the keys for the values
+ * @return a new registry set
+ * @param <T> the type of the values
+ */
+ @SuppressWarnings("BoundedWildcard")
+ @Contract(value = "_, _ -> new", pure = true)
+ static <T extends Keyed> RegistryKeySet<T> keySet(final RegistryKey<T> registryKey, final Iterable<TypedKey<T>> keys) { // TODO remove Keyed
+ return new RegistryKeySetImpl<>(registryKey, Lists.newArrayList(keys));
+ }
+
+ /**
+ * Get the registry key for this set.
+ *
+ * @return the registry key
+ */
+ RegistryKey<T> registryKey();
+
+ /**
+ * Get the size of this set.
+ *
+ * @return the size
+ */
+ int size();
+
+ /**
+ * Checks if the registry set is empty.
+ *
+ * @return true, if empty
+ */
+ default boolean isEmpty() {
+ return this.size() == 0;
+ }
+}
diff --git a/src/main/java/io/papermc/paper/registry/set/RegistryValueSet.java b/src/main/java/io/papermc/paper/registry/set/RegistryValueSet.java
new file mode 100644
index 0000000000000000000000000000000000000000..9f7761535c30c376dad64678fa2ee24bbb041e06
--- /dev/null
+++ b/src/main/java/io/papermc/paper/registry/set/RegistryValueSet.java
@@ -0,0 +1,35 @@
+package io.papermc.paper.registry.set;
+
+import java.util.Collection;
+import java.util.Iterator;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.Unmodifiable;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * A collection of anonymous values relating to a registry. These
+ * are values of the same type as the registry, but will not be found
+ * in the registry, hence, anonymous.
+ * @param <T> registry value type
+ */
+@ApiStatus.Experimental
+@NullMarked
+public sealed interface RegistryValueSet<T> extends Iterable<T>, RegistrySet<T> permits RegistryValueSetImpl {
+
+ @Override
+ default int size() {
+ return this.values().size();
+ }
+
+ /**
+ * Get the collection of values in this direct set.
+ *
+ * @return the values
+ */
+ @Unmodifiable Collection<T> values();
+
+ @Override
+ default Iterator<T> iterator() {
+ return this.values().iterator();
+ }
+}
diff --git a/src/main/java/io/papermc/paper/registry/set/RegistryValueSetImpl.java b/src/main/java/io/papermc/paper/registry/set/RegistryValueSetImpl.java
new file mode 100644
index 0000000000000000000000000000000000000000..1bcc6b4b9ff0090570d4f39a49e10e1fa03edb7d
--- /dev/null
+++ b/src/main/java/io/papermc/paper/registry/set/RegistryValueSetImpl.java
@@ -0,0 +1,20 @@
+package io.papermc.paper.registry.set;
+
+import com.google.common.collect.Lists;
+import io.papermc.paper.registry.RegistryKey;
+import java.util.List;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+
+@ApiStatus.Internal
+@NullMarked
+record RegistryValueSetImpl<T>(RegistryKey<T> registryKey, List<T> values) implements RegistryValueSet<T> {
+
+ RegistryValueSetImpl {
+ values = List.copyOf(values);
+ }
+
+ static <T> RegistryValueSet<T> create(final RegistryKey<T> registryKey, final Iterable<? extends T> values) {
+ return new RegistryValueSetImpl<>(registryKey, Lists.newArrayList(values));
+ }
+}
diff --git a/src/main/java/io/papermc/paper/registry/tag/Tag.java b/src/main/java/io/papermc/paper/registry/tag/Tag.java
new file mode 100644
index 0000000000000000000000000000000000000000..245eb1074ce2930e4d9ff42a5df49004d08bbac2
--- /dev/null
+++ b/src/main/java/io/papermc/paper/registry/tag/Tag.java
@@ -0,0 +1,26 @@
+package io.papermc.paper.registry.tag;
+
+import io.papermc.paper.registry.set.RegistryKeySet;
+import org.bukkit.Keyed;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * A named {@link RegistryKeySet} which are created
+ * via the datapack tag system.
+ *
+ * @param <T>
+ * @see org.bukkit.Tag
+ * @see org.bukkit.Registry#getTag(TagKey)
+ */
+@ApiStatus.Experimental
+@NullMarked
+public interface Tag<T extends Keyed> extends RegistryKeySet<T> { // TODO remove Keyed
+
+ /**
+ * Get the identifier for this named set.
+ *
+ * @return the tag key identifier
+ */
+ TagKey<T> tagKey();
+}
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..f84d95b29fd2c0a52d2769fa9d3e2326ebc8aa3f
--- /dev/null
+++ b/src/main/java/io/papermc/paper/registry/tag/TagKey.java
@@ -0,0 +1,33 @@
+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.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.Contract;
+import org.jspecify.annotations.NullMarked;
+
+@ApiStatus.Experimental
+@NullMarked
+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> TagKey<T> create(final RegistryKey<T> registryKey, final Key key) {
+ return new TagKeyImpl<>(registryKey, key);
+ }
+
+ /**
+ * Get the registry key for this tag key.
+ *
+ * @return the registry key
+ */
+ 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..bf49125acc8a0508bf59674bba3ed3505ee9481a
--- /dev/null
+++ b/src/main/java/io/papermc/paper/registry/tag/TagKeyImpl.java
@@ -0,0 +1,16 @@
+package io.papermc.paper.registry.tag;
+
+import io.papermc.paper.registry.RegistryKey;
+import net.kyori.adventure.key.Key;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+
+@ApiStatus.Internal
+@NullMarked
+record TagKeyImpl<T>(RegistryKey<T> registryKey, Key key) implements TagKey<T> {
+
+ @Override
+ public String toString() {
+ return "#" + this.key + " (in " + this.registryKey + ")";
+ }
+}
diff --git a/src/main/java/org/bukkit/Registry.java b/src/main/java/org/bukkit/Registry.java
index c3d49f9c640eb390f507f9521a389cb7c172983a..87907918c42b11780b285b6d82e7297628a07376 100644
--- a/src/main/java/org/bukkit/Registry.java
+++ b/src/main/java/org/bukkit/Registry.java
@@ -384,6 +384,27 @@ public interface Registry<T extends Keyed> extends Iterable<T> {
*/
@Nullable
T get(@NotNull NamespacedKey key);
+ // Paper start
+ /**
+ * Get the object by its key.
+ *
+ * @param key non-null key
+ * @return item or null if it does not exist
+ */
+ default @Nullable T get(final net.kyori.adventure.key.@NotNull Key key) {
+ return key instanceof final NamespacedKey nsKey ? this.get(nsKey) : this.get(new NamespacedKey(key.namespace(), key.value()));
+ }
+
+ /**
+ * Get the object by its typed key.
+ *
+ * @param typedKey non-null typed key
+ * @return item or null if it does not exist
+ */
+ default @Nullable T get(final io.papermc.paper.registry.@NotNull TypedKey<T> typedKey) {
+ return this.get(typedKey.key());
+ }
+ // Paper end
// Paper start - improve Registry
/**
@@ -458,6 +479,34 @@ public interface Registry<T extends Keyed> extends Iterable<T> {
}
// Paper end - improve Registry
+ // Paper start - RegistrySet API
+ /**
+ * Checks if this registry has a tag with the given key.
+ *
+ * @param key the key to check for
+ * @return true if this registry has a tag with the given key, false otherwise
+ * @see #getTag(io.papermc.paper.registry.tag.TagKey)
+ */
+ @ApiStatus.Experimental
+ default boolean hasTag(final io.papermc.paper.registry.tag.@NotNull TagKey<T> key) {
+ throw new UnsupportedOperationException(this + " doesn't have tags");
+ }
+
+ /**
+ * Gets the named registry set (tag) for the given key.
+ *
+ * @param key the key to get the tag for
+ * @return the tag for the key
+ * @throws java.util.NoSuchElementException if no tag with the given key is found
+ * @throws UnsupportedOperationException if this registry doesn't have or support tags
+ * @see #hasTag(io.papermc.paper.registry.tag.TagKey)
+ */
+ @ApiStatus.Experimental
+ default @NotNull io.papermc.paper.registry.tag.Tag<T> getTag(final io.papermc.paper.registry.tag.@NotNull TagKey<T> key) {
+ throw new UnsupportedOperationException(this + " doesn't have tags");
+ }
+ // Paper end - RegistrySet API
+
/**
* Get the object by its key.
*
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