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Paper/patches/api/0484-Add-FeatureFlag-API.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Thu, 9 Mar 2023 11:24:43 -0800
Subject: [PATCH] Add FeatureFlag API
diff --git a/src/main/java/io/papermc/paper/world/flag/FeatureDependant.java b/src/main/java/io/papermc/paper/world/flag/FeatureDependant.java
new file mode 100644
index 0000000000000000000000000000000000000000..f5633319c64bf19cf07e2b9a1cac2dd1d11ab70b
--- /dev/null
+++ b/src/main/java/io/papermc/paper/world/flag/FeatureDependant.java
@@ -0,0 +1,28 @@
+package io.papermc.paper.world.flag;
+
+import java.util.Set;
+import org.bukkit.FeatureFlag;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.Unmodifiable;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * Implemented by types in built-in registries that are controlled by {@link FeatureFlag FeatureFlags}.
+ * Types in data-driven registries that are controlled by feature flags just will not exist in that registry.
+ * @apiNote When a type that currently implements this interface transitions to being data-drive, this
+ * interface will be removed from that type in the following major version.
+ */
+@NullMarked
+@ApiStatus.NonExtendable
+public interface FeatureDependant {
+
+ /**
+ * Gets the set of required feature flags for this
+ * to be enabled.
+ *
+ * @return the immutable set of feature flags
+ */
+ default @Unmodifiable Set<FeatureFlag> requiredFeatures() {
+ return FeatureFlagProvider.provider().requiredFeatures(this);
+ }
+}
diff --git a/src/main/java/io/papermc/paper/world/flag/FeatureFlagProvider.java b/src/main/java/io/papermc/paper/world/flag/FeatureFlagProvider.java
new file mode 100644
index 0000000000000000000000000000000000000000..388e70628f88d8ee0749a43f82b228453e25d5d0
--- /dev/null
+++ b/src/main/java/io/papermc/paper/world/flag/FeatureFlagProvider.java
@@ -0,0 +1,21 @@
+package io.papermc.paper.world.flag;
+
+import java.util.Optional;
+import java.util.ServiceLoader;
+import java.util.Set;
+import org.bukkit.FeatureFlag;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+
+@NullMarked
+@ApiStatus.Internal
+interface FeatureFlagProvider {
+
+ Optional<FeatureFlagProvider> PROVIDER = ServiceLoader.load(FeatureFlagProvider.class).findFirst();
+
+ static FeatureFlagProvider provider() {
+ return PROVIDER.orElseThrow();
+ }
+
+ Set<FeatureFlag> requiredFeatures(FeatureDependant dependant);
+}
diff --git a/src/main/java/io/papermc/paper/world/flag/FeatureFlagSetHolder.java b/src/main/java/io/papermc/paper/world/flag/FeatureFlagSetHolder.java
new file mode 100644
index 0000000000000000000000000000000000000000..0955699df65ccbb8711cfa48f0b34d5a8805f1af
--- /dev/null
+++ b/src/main/java/io/papermc/paper/world/flag/FeatureFlagSetHolder.java
@@ -0,0 +1,32 @@
+package io.papermc.paper.world.flag;
+
+import java.util.Set;
+import org.bukkit.FeatureFlag;
+import org.jetbrains.annotations.ApiStatus;
+import org.jetbrains.annotations.Unmodifiable;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * Implemented by types that hold {@link FeatureFlag FeatureFlags} like
+ * {@link org.bukkit.generator.WorldInfo} and {@link org.bukkit.RegionAccessor}.
+ */
+@NullMarked
+@ApiStatus.NonExtendable
+public interface FeatureFlagSetHolder {
+
+ /**
+ * Checks if this is enabled based on the loaded feature flags.
+ *
+ * @return true if enabled
+ */
+ default boolean isEnabled(final FeatureDependant featureDependant) {
+ return this.getFeatureFlags().containsAll(featureDependant.requiredFeatures());
+ }
+
+ /**
+ * Get all {@link FeatureFlag FeatureFlags} enabled in this world.
+ *
+ * @return all enabled {@link FeatureFlag FeatureFlags}
+ */
+ @Unmodifiable Set<FeatureFlag> getFeatureFlags();
+}
diff --git a/src/main/java/org/bukkit/FeatureFlag.java b/src/main/java/org/bukkit/FeatureFlag.java
index 20eb27ee041f77f295eb271f878c524ce5592251..0acea3e8d639c252b44cd5da5e3584aa6e6c9b5c 100644
--- a/src/main/java/org/bukkit/FeatureFlag.java
+++ b/src/main/java/org/bukkit/FeatureFlag.java
@@ -1,17 +1,24 @@
package org.bukkit;
+// Paper start - overhaul FeatureFlag API
+import com.google.common.base.Preconditions;
+import java.util.List;
+import net.kyori.adventure.key.Key;
+import net.kyori.adventure.util.Index;
+import org.intellij.lang.annotations.Subst;
+// Paper end - overhaul FeatureFlag API
import org.jetbrains.annotations.ApiStatus;
/**
- * This represents a Feature Flag for a World.
- * <br>
- * Flags which are unavailable in the current version will be null and/or
- * removed.
+ * This represents a Feature Flag for a {@link io.papermc.paper.world.flag.FeatureFlagSetHolder}.
*/
-@ApiStatus.Experimental
public interface FeatureFlag extends Keyed {
- public static final FeatureFlag VANILLA = Bukkit.getUnsafe().getFeatureFlag(NamespacedKey.minecraft("vanilla"));
+ // Paper start - overhaul FeatureFlag API
+ /**
+ * The {@code vanilla} feature flag.
+ */
+ FeatureFlag VANILLA = create("vanilla");
/**
* <strong>AVAILABLE BETWEEN VERSIONS:</strong> 1.19.3 - 1.21.1
@@ -19,34 +26,43 @@ public interface FeatureFlag extends Keyed {
* @deprecated not available since 1.21.2
*/
@Deprecated
- public static final FeatureFlag BUNDLE = Bukkit.getUnsafe().getFeatureFlag(NamespacedKey.minecraft("bundle"));
+ FeatureFlag BUNDLE = deprecated("bundle");
/**
- * <strong>AVAILABLE BETWEEN VERSIONS:</strong> 1.19 - 1.19.4
- *
- * @deprecated not available since 1.20
+ * The {@code trade_rebalance} feature flag.
*/
- @Deprecated
- public static final FeatureFlag UPDATE_1_20 = Bukkit.getUnsafe().getFeatureFlag(NamespacedKey.minecraft("update_1_20"));
-
@ApiStatus.Experimental // Paper - add missing annotation
- public static final FeatureFlag TRADE_REBALANCE = Bukkit.getUnsafe().getFeatureFlag(NamespacedKey.minecraft("trade_rebalance"));
+ FeatureFlag TRADE_REBALANCE = create("trade_rebalance");
- /**
- * <strong>AVAILABLE BETWEEN VERSIONS:</strong> 1.20.5 - 1.20.6
- *
- * @deprecated not available since 1.21
- */
- @Deprecated
- public static final FeatureFlag UPDATE_121 = Bukkit.getUnsafe().getFeatureFlag(NamespacedKey.minecraft("update_1_21"));
+ @Deprecated(since = "1.20")
+ FeatureFlag UPDATE_1_20 = deprecated("update_1_20");
+
+ @Deprecated(since = "1.21")
+ FeatureFlag UPDATE_121 = deprecated("update_1_21");
@ApiStatus.Experimental // Paper - add missing annotation
- public static final FeatureFlag WINTER_DROP = Bukkit.getUnsafe().getFeatureFlag(NamespacedKey.minecraft("winter_drop"));
+ FeatureFlag WINTER_DROP = create("winter_drop");
@ApiStatus.Experimental // Paper - add missing annotation
- public static final FeatureFlag REDSTONE_EXPERIMENTS = Bukkit.getUnsafe().getFeatureFlag(NamespacedKey.minecraft("redstone_experiments"));
+ FeatureFlag REDSTONE_EXPERIMENTS = create("redstone_experiments");
@ApiStatus.Experimental // Paper - add missing annotation
- public static final FeatureFlag MINECART_IMPROVEMENTS = Bukkit.getUnsafe().getFeatureFlag(NamespacedKey.minecraft("minecart_improvements"));
+ FeatureFlag MINECART_IMPROVEMENTS = create("minecart_improvements");
+
+ /**
+ * An index of all feature flags.
+ */
+ Index<Key, FeatureFlag> ALL_FLAGS = Index.create(FeatureFlag::key, List.copyOf(FeatureFlagImpl.ALL_FLAGS));
+
+ private static FeatureFlag create(@Subst("vanilla") final String name) {
+ final FeatureFlag flag = new FeatureFlagImpl(NamespacedKey.minecraft(name));
+ Preconditions.checkState(FeatureFlagImpl.ALL_FLAGS.add(flag), "Tried to add duplicate feature flag: " + name);
+ return flag;
+ }
+
+ private static FeatureFlag deprecated(@Subst("vanilla") final String name) {
+ return new FeatureFlagImpl.Deprecated(NamespacedKey.minecraft(name));
+ }
+ // Paper end - overhaul FeatureFlag API
}
diff --git a/src/main/java/org/bukkit/FeatureFlagImpl.java b/src/main/java/org/bukkit/FeatureFlagImpl.java
new file mode 100644
index 0000000000000000000000000000000000000000..5a43f65f633dc9a1a0ba7dba0c15488375427444
--- /dev/null
+++ b/src/main/java/org/bukkit/FeatureFlagImpl.java
@@ -0,0 +1,27 @@
+package org.bukkit;
+
+import java.util.HashSet;
+import java.util.Set;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+
+@ApiStatus.Internal
+@NullMarked
+record FeatureFlagImpl(NamespacedKey key) implements FeatureFlag {
+
+ static final Set<FeatureFlag> ALL_FLAGS = new HashSet<>();
+
+ @Override
+ public NamespacedKey getKey() {
+ return this.key;
+ }
+
+ @ApiStatus.Internal
+ record Deprecated(NamespacedKey key) implements FeatureFlag {
+
+ @Override
+ public NamespacedKey getKey() {
+ return this.key;
+ }
+ }
+}
diff --git a/src/main/java/org/bukkit/RegionAccessor.java b/src/main/java/org/bukkit/RegionAccessor.java
index eb33e8e671972aa308ad75a7ce9aa9ac526f470f..05ecf3cb38ff42c8b52405d900197e6bf47dd1e6 100644
--- a/src/main/java/org/bukkit/RegionAccessor.java
+++ b/src/main/java/org/bukkit/RegionAccessor.java
@@ -18,7 +18,7 @@ import org.jetbrains.annotations.Nullable;
* A RegionAccessor gives access to getting, modifying and spawning {@link Biome}, {@link BlockState} and {@link Entity},
* as well as generating some basic structures.
*/
-public interface RegionAccessor extends Keyed { // Paper
+public interface RegionAccessor extends Keyed, io.papermc.paper.world.flag.FeatureFlagSetHolder { // Paper - feature flag API
/**
* Gets the {@link Biome} at the given {@link Location}.
diff --git a/src/main/java/org/bukkit/UnsafeValues.java b/src/main/java/org/bukkit/UnsafeValues.java
index 307439827b401acb96f0df1cf4ef31835bd1d513..e8dc8a6abebf6c31cb095ca3646eb4909e42f105 100644
--- a/src/main/java/org/bukkit/UnsafeValues.java
+++ b/src/main/java/org/bukkit/UnsafeValues.java
@@ -111,8 +111,7 @@ public interface UnsafeValues {
@Deprecated(since = "1.21.3", forRemoval = true)
String getTranslationKey(Attribute attribute);
- @Nullable
- FeatureFlag getFeatureFlag(@NotNull NamespacedKey key);
+ // Paper - replace with better system
/**
* Do not use, method will get removed, and the plugin won't run
diff --git a/src/main/java/org/bukkit/block/BlockType.java b/src/main/java/org/bukkit/block/BlockType.java
index c080c2a3323d19cb3d549aa0fe6c164666d7da75..ed534fe4983873a2d5f623f0d9d5e3ce254615eb 100644
--- a/src/main/java/org/bukkit/block/BlockType.java
+++ b/src/main/java/org/bukkit/block/BlockType.java
@@ -129,7 +129,7 @@ import org.jetbrains.annotations.Nullable;
* changes may occur. Do not use this API in plugins.
*/
@ApiStatus.Internal
-public interface BlockType extends Keyed, Translatable, net.kyori.adventure.translation.Translatable { // Paper - add translatable
+public interface BlockType extends Keyed, Translatable, net.kyori.adventure.translation.Translatable, io.papermc.paper.world.flag.FeatureDependant { // Paper - add translatable & feature flag API
/**
* Typed represents a subtype of {@link BlockType}s that have a known block
@@ -3629,7 +3629,9 @@ public interface BlockType extends Keyed, Translatable, net.kyori.adventure.tran
*
* @param world the world to check
* @return true if this BlockType can be used in this World.
+ * @deprecated Use {@link io.papermc.paper.world.flag.FeatureFlagSetHolder#isEnabled(io.papermc.paper.world.flag.FeatureDependant)}
*/
+ @Deprecated(forRemoval = true, since = "1.21.1") // Paper
boolean isEnabledByFeature(@NotNull World world);
/**
diff --git a/src/main/java/org/bukkit/entity/EntityType.java b/src/main/java/org/bukkit/entity/EntityType.java
index 9e115cec6232b22760e91ade671f81461c0c0364..c1aa59bab82aee8fd42f7149c520b45660b29082 100644
--- a/src/main/java/org/bukkit/entity/EntityType.java
+++ b/src/main/java/org/bukkit/entity/EntityType.java
@@ -45,7 +45,7 @@ import org.jetbrains.annotations.Contract;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
-public enum EntityType implements Keyed, Translatable, net.kyori.adventure.translation.Translatable { // Paper - translatable
+public enum EntityType implements Keyed, Translatable, net.kyori.adventure.translation.Translatable, io.papermc.paper.world.flag.FeatureDependant { // Paper - translatable
// These strings MUST match the strings in nms.EntityTypes and are case sensitive.
/**
diff --git a/src/main/java/org/bukkit/generator/WorldInfo.java b/src/main/java/org/bukkit/generator/WorldInfo.java
index 5067f1371433cccd3287af7f03e152f2c3c1ece3..e0cb282541548ac3bd24cce86b3413f5748ea8bc 100644
--- a/src/main/java/org/bukkit/generator/WorldInfo.java
+++ b/src/main/java/org/bukkit/generator/WorldInfo.java
@@ -7,7 +7,7 @@ import org.jetbrains.annotations.NotNull;
/**
* Holds various information of a World
*/
-public interface WorldInfo {
+public interface WorldInfo extends io.papermc.paper.world.flag.FeatureFlagSetHolder { // Paper - feature flag API
/**
* Gets the unique name of this world
diff --git a/src/main/java/org/bukkit/inventory/ItemType.java b/src/main/java/org/bukkit/inventory/ItemType.java
index ef3a30d5cca29c7a7c546791be3c333e63e425f4..72803c00e4af576f286d2af34bf300ee554a7f3c 100644
--- a/src/main/java/org/bukkit/inventory/ItemType.java
+++ b/src/main/java/org/bukkit/inventory/ItemType.java
@@ -48,7 +48,7 @@ import org.jetbrains.annotations.Nullable;
* changes may occur. Do not use this API in plugins.
*/
@ApiStatus.Experimental // Paper - already required for registry builders
-public interface ItemType extends Keyed, Translatable, net.kyori.adventure.translation.Translatable { // Paper - add Translatable
+public interface ItemType extends Keyed, Translatable, net.kyori.adventure.translation.Translatable, io.papermc.paper.world.flag.FeatureDependant { // Paper - add Translatable & feature flag API
/**
* Typed represents a subtype of {@link ItemType}s that have a known item meta type
@@ -2451,7 +2451,9 @@ public interface ItemType extends Keyed, Translatable, net.kyori.adventure.trans
*
* @param world the world to check
* @return true if this ItemType can be used in this World.
+ * @deprecated use {@link io.papermc.paper.world.flag.FeatureFlagSetHolder#isEnabled(io.papermc.paper.world.flag.FeatureDependant)}
*/
+ @Deprecated(forRemoval = true, since = "1.21.1") // Paper
boolean isEnabledByFeature(@NotNull World world);
/**
diff --git a/src/main/java/org/bukkit/inventory/MenuType.java b/src/main/java/org/bukkit/inventory/MenuType.java
index 34d45a105da72481a7c4f2e3831f5d2a676c91c6..529143c9007d6da4f671576f9934933f2e5d6f23 100644
--- a/src/main/java/org/bukkit/inventory/MenuType.java
+++ b/src/main/java/org/bukkit/inventory/MenuType.java
@@ -22,7 +22,7 @@ import org.jetbrains.annotations.NotNull;
* created and viewed by the player.
*/
@ApiStatus.Experimental
-public interface MenuType extends Keyed {
+public interface MenuType extends Keyed, io.papermc.paper.world.flag.FeatureDependant { // Paper - make FeatureDependant
/**
* A MenuType which represents a chest with 1 row.
diff --git a/src/main/java/org/bukkit/potion/PotionEffectType.java b/src/main/java/org/bukkit/potion/PotionEffectType.java
index d02bb37768404422969d8b93e009960d0a693a93..294ba70f1e446ec8d502e5c14f82ae52547aeb21 100644
--- a/src/main/java/org/bukkit/potion/PotionEffectType.java
+++ b/src/main/java/org/bukkit/potion/PotionEffectType.java
@@ -17,7 +17,7 @@ import org.jetbrains.annotations.Nullable;
/**
* Represents a type of potion and its effect on an entity.
*/
-public abstract class PotionEffectType implements Keyed, Translatable, net.kyori.adventure.translation.Translatable { // Paper - implement Translatable
+public abstract class PotionEffectType implements Keyed, Translatable, net.kyori.adventure.translation.Translatable, io.papermc.paper.world.flag.FeatureDependant { // Paper - implement Translatable & feature flag API
private static final BiMap<Integer, PotionEffectType> ID_MAP = HashBiMap.create();
/**
diff --git a/src/main/java/org/bukkit/potion/PotionType.java b/src/main/java/org/bukkit/potion/PotionType.java
index 453c626092caa734a0af5800699f299fc6fd0e43..c82cc9d9db5cb0e0e3c02f6a9564fc935ee594aa 100644
--- a/src/main/java/org/bukkit/potion/PotionType.java
+++ b/src/main/java/org/bukkit/potion/PotionType.java
@@ -14,7 +14,7 @@ import org.jetbrains.annotations.Nullable;
* This enum reflects and matches each potion state that can be obtained from
* the Creative mode inventory
*/
-public enum PotionType implements Keyed {
+public enum PotionType implements Keyed, io.papermc.paper.world.flag.FeatureDependant { // Paper - feature flag API
WATER("water"),
MUNDANE("mundane"),
THICK("thick"),
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