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8c5b837e05
Paper/patches/server/0907-Add-drops-to-shear-events.patch
Spottedleaf 8c5b837e05 Rework async chunk api implementation 
Firstly, the old methods all routed to the CompletableFuture method.
However, the CF method could not guarantee that if the caller
was off-main that the future would be "completed" on-main. Since
the callback methods used the CF one, this meant that the callback
methods did not guarantee that the callbacks were to be called on
the main thread.

Now, all methods route to getChunkAtAsync(x, z, gen, urgent, cb)
so that the methods with the callback are guaranteed to invoke
the callback on the main thread. The CF behavior remains unchanged;
it may still appear to complete on main if invoked off-main.

Secondly, remove the scheduleOnMain invocation in the async
chunk completion. This unnecessarily delays the callback
by 1 tick.

Thirdly, add getChunksAtAsync(minX, minZ, maxX, maxZ, ...) which
will load chunks within an area. This method is provided as a helper
as keeping all chunks loaded within an area can be complicated to
implement for plugins (due to the lacking ticket API), and is
already implemented internally anyways.

Fourthly, remove the ticket addition that occured with getChunkAt
and getChunkAtAsync. The ticket addition may delay the unloading
of the chunk unnecessarily. It also fixes a very rare timing bug
where the future/callback would be completed after the chunk
unloads.
2024-11-18 23:00:59 -08:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Tue, 18 May 2021 12:32:02 -0700
Subject: [PATCH] Add drops to shear events
diff --git a/src/main/java/net/minecraft/core/dispenser/ShearsDispenseItemBehavior.java b/src/main/java/net/minecraft/core/dispenser/ShearsDispenseItemBehavior.java
index 9b5a1dc958232e4c2c9631f3504edc6383afd92a..f5206e4176f58cff4cfe70c94f014afebc98c589 100644
--- a/src/main/java/net/minecraft/core/dispenser/ShearsDispenseItemBehavior.java
+++ b/src/main/java/net/minecraft/core/dispenser/ShearsDispenseItemBehavior.java
@@ -103,11 +103,14 @@ public class ShearsDispenseItemBehavior extends OptionalDispenseItemBehavior {
if (entityliving instanceof Shearable ishearable) {
if (ishearable.readyForShearing()) {
// CraftBukkit start
- if (CraftEventFactory.callBlockShearEntityEvent(entityliving, bukkitBlock, craftItem).isCancelled()) {
+ // Paper start - Add drops to shear events
+ org.bukkit.event.block.BlockShearEntityEvent event = CraftEventFactory.callBlockShearEntityEvent(entityliving, bukkitBlock, craftItem, ishearable.generateDefaultDrops(worldserver, itemstack));
+ if (event.isCancelled()) {
+ // Paper end - Add drops to shear events
continue;
}
// CraftBukkit end
- ishearable.shear(worldserver, SoundSource.BLOCKS, itemstack);
+ ishearable.shear(worldserver, SoundSource.BLOCKS, itemstack, CraftItemStack.asNMSCopy(event.getDrops())); // Paper - Add drops to shear events
worldserver.gameEvent((Entity) null, (Holder) GameEvent.SHEAR, blockposition);
return true;
}
diff --git a/src/main/java/net/minecraft/world/entity/Shearable.java b/src/main/java/net/minecraft/world/entity/Shearable.java
index 35076593f3ccd651295ae1fc9bcf8256c19672dd..8fda407c9fbfdde623564a7d9607275c4894b744 100644
--- a/src/main/java/net/minecraft/world/entity/Shearable.java
+++ b/src/main/java/net/minecraft/world/entity/Shearable.java
@@ -5,8 +5,15 @@ import net.minecraft.sounds.SoundSource;
import net.minecraft.world.item.ItemStack;
public interface Shearable {
+ default void shear(ServerLevel world, SoundSource soundCategory, ItemStack shears, java.util.List<net.minecraft.world.item.ItemStack> drops) { this.shear(world, soundCategory, shears); } // Paper - Add drops to shear events
void shear(ServerLevel world, SoundSource shearedSoundCategory, ItemStack shears);
boolean readyForShearing();
net.minecraft.world.level.Level level(); // Shearable API - expose default level needed for shearing.
+
+ // Paper start - custom shear drops; ensure all implementing entities override this
+ default java.util.List<net.minecraft.world.item.ItemStack> generateDefaultDrops(final ServerLevel serverLevel, final ItemStack shears) {
+ return java.util.Collections.emptyList();
+ }
+ // Paper end - custom shear drops
}
diff --git a/src/main/java/net/minecraft/world/entity/animal/MushroomCow.java b/src/main/java/net/minecraft/world/entity/animal/MushroomCow.java
index d4d343e2d75a3e3ea787c3c68c64970f5b239f81..feeb7bc34ae02e44d7f13f0bae5d175ef924c53a 100644
--- a/src/main/java/net/minecraft/world/entity/animal/MushroomCow.java
+++ b/src/main/java/net/minecraft/world/entity/animal/MushroomCow.java
@@ -46,6 +46,7 @@ import net.minecraft.world.level.storage.loot.BuiltInLootTables;
// CraftBukkit start
import org.bukkit.Bukkit;
import org.bukkit.craftbukkit.event.CraftEventFactory;
+import org.bukkit.craftbukkit.inventory.CraftItemStack;
import org.bukkit.event.entity.EntityDropItemEvent;
import org.bukkit.event.entity.EntityTransformEvent;
// CraftBukkit end
@@ -128,11 +129,18 @@ public class MushroomCow extends Cow implements Shearable, VariantHolder<Mushroo
ServerLevel worldserver = (ServerLevel) world;
// CraftBukkit start
- if (!CraftEventFactory.handlePlayerShearEntityEvent(player, this, itemstack, hand)) {
- return InteractionResult.PASS;
+ // Paper start - custom shear drops
+ java.util.List<ItemStack> drops = this.generateDefaultDrops(worldserver, itemstack);
+ org.bukkit.event.player.PlayerShearEntityEvent event = CraftEventFactory.handlePlayerShearEntityEvent(player, this, itemstack, hand, drops);
+ if (event != null) {
+ if (event.isCancelled()) {
+ return InteractionResult.PASS;
+ }
+ drops = org.bukkit.craftbukkit.inventory.CraftItemStack.asNMSCopy(event.getDrops());
+ // Paper end - custom shear drops
}
// CraftBukkit end
- this.shear(worldserver, SoundSource.PLAYERS, itemstack);
+ this.shear(worldserver, SoundSource.PLAYERS, itemstack, drops); // Paper - custom shear drops
this.gameEvent(GameEvent.SHEAR, player);
itemstack.hurtAndBreak(1, player, getSlotForHand(hand));
}
@@ -168,22 +176,32 @@ public class MushroomCow extends Cow implements Shearable, VariantHolder<Mushroo
@Override
public void shear(ServerLevel world, SoundSource shearedSoundCategory, ItemStack shears) {
+ // Paper start - custom shear drops
+ this.shear(world, shearedSoundCategory, shears, this.generateDefaultDrops(world, shears));
+ }
+
+ @Override
+ public java.util.List<ItemStack> generateDefaultDrops(final ServerLevel serverLevel, final ItemStack shears) {
+ final java.util.List<ItemStack> drops = new it.unimi.dsi.fastutil.objects.ObjectArrayList<>();
+ this.dropFromShearingLootTable(serverLevel, BuiltInLootTables.SHEAR_MOOSHROOM, shears, (ignored, stack) -> {
+ for (int i = 0; i < stack.getCount(); ++i) drops.add(stack.copyWithCount(1));
+ });
+ return drops;
+ }
+
+ @Override
+ public void shear(ServerLevel world, SoundSource shearedSoundCategory, ItemStack shears, java.util.List<ItemStack> drops) {
+ // Paper end - custom shear drops
world.playSound((Player) null, (Entity) this, SoundEvents.MOOSHROOM_SHEAR, shearedSoundCategory, 1.0F, 1.0F);
this.convertTo(EntityType.COW, ConversionParams.single(this, false, false), (entitycow) -> {
world.sendParticles(ParticleTypes.EXPLOSION, this.getX(), this.getY(0.5D), this.getZ(), 1, 0.0D, 0.0D, 0.0D, 0.0D);
- this.dropFromShearingLootTable(world, BuiltInLootTables.SHEAR_MOOSHROOM, shears, (worldserver1, itemstack1) -> {
- for (int i = 0; i < itemstack1.getCount(); ++i) {
- // CraftBukkit start
- ItemEntity entityitem = new ItemEntity(this.level(), this.getX(), this.getY(1.0D), this.getZ(), itemstack1.copyWithCount(1));
- EntityDropItemEvent event = new EntityDropItemEvent(this.getBukkitEntity(), (org.bukkit.entity.Item) entityitem.getBukkitEntity());
- Bukkit.getPluginManager().callEvent(event);
- if (event.isCancelled()) {
- continue;
- }
- worldserver1.addFreshEntity(entityitem);
- // CraftBukkit end
+ // Paper start - custom shear drops; moved drop generation to separate method
+ drops.forEach(itemstack1 -> {
+ for (final ItemStack drop : drops) {
+ ItemEntity entityitem = new ItemEntity(this.level(), this.getX(), this.getY(1.0D), this.getZ(), drop);
+ this.spawnAtLocation(world, entityitem);
}
-
+ // Paper end - custom shear drops; moved drop generation to separate method
});
}, EntityTransformEvent.TransformReason.SHEARED, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.SHEARED); // CraftBukkit
}
diff --git a/src/main/java/net/minecraft/world/entity/animal/Sheep.java b/src/main/java/net/minecraft/world/entity/animal/Sheep.java
index 1bc638ab505850bffcbd08025de9664dd27e47c6..432ad1c785e133ef18390108fd342be50ec4dddc 100644
--- a/src/main/java/net/minecraft/world/entity/animal/Sheep.java
+++ b/src/main/java/net/minecraft/world/entity/animal/Sheep.java
@@ -173,11 +173,18 @@ public class Sheep extends Animal implements Shearable {
if (this.readyForShearing()) {
// CraftBukkit start
- if (!CraftEventFactory.handlePlayerShearEntityEvent(player, this, itemstack, hand)) {
- return InteractionResult.PASS;
+ // Paper start - custom shear drops
+ java.util.List<ItemStack> drops = this.generateDefaultDrops(worldserver, itemstack);
+ org.bukkit.event.player.PlayerShearEntityEvent event = CraftEventFactory.handlePlayerShearEntityEvent(player, this, itemstack, hand, drops);
+ if (event != null) {
+ if (event.isCancelled()) {
+ return InteractionResult.PASS;
+ }
+ drops = org.bukkit.craftbukkit.inventory.CraftItemStack.asNMSCopy(event.getDrops());
+ // Paper end - custom shear drops
}
// CraftBukkit end
- this.shear(worldserver, SoundSource.PLAYERS, itemstack);
+ this.shear(worldserver, SoundSource.PLAYERS, itemstack, drops); // Paper - custom shear drops
this.gameEvent(GameEvent.SHEAR, player);
itemstack.hurtAndBreak(1, player, getSlotForHand(hand));
return InteractionResult.SUCCESS_SERVER;
@@ -192,9 +199,26 @@ public class Sheep extends Animal implements Shearable {
@Override
public void shear(ServerLevel world, SoundSource shearedSoundCategory, ItemStack shears) {
+ // Paper start - custom shear drops
+ this.shear(world, shearedSoundCategory, shears, this.generateDefaultDrops(world, shears));
+ }
+
+ @Override
+ public java.util.List<ItemStack> generateDefaultDrops(final ServerLevel serverLevel, final ItemStack shears) {
+ final java.util.List<ItemStack> drops = new it.unimi.dsi.fastutil.objects.ObjectArrayList<>();
+ this.dropFromShearingLootTable(serverLevel, BuiltInLootTables.SHEAR_SHEEP, shears, (ignored, stack) -> {
+ for (int i = 0; i < stack.getCount(); ++i) drops.add(stack.copyWithCount(1));
+ });
+ return drops;
+ }
+
+ @Override
+ public void shear(ServerLevel world, SoundSource shearedSoundCategory, ItemStack shears, java.util.List<ItemStack> drops) {
+ final ServerLevel worldserver1 = world; // Named for lambda consumption
+ // Paper end - custom shear drops
world.playSound((Player) null, (Entity) this, SoundEvents.SHEEP_SHEAR, shearedSoundCategory, 1.0F, 1.0F);
- this.dropFromShearingLootTable(world, BuiltInLootTables.SHEAR_SHEEP, shears, (worldserver1, itemstack1) -> {
- for (int i = 0; i < itemstack1.getCount(); ++i) {
+ drops.forEach(itemstack1 -> { // Paper - custom drops - loop in generated default drops
+ if (true) { // Paper - custom drops - loop in generated default drops
this.forceDrops = true; // CraftBukkit
ItemEntity entityitem = this.spawnAtLocation(worldserver1, itemstack1.copyWithCount(1), 1.0F);
this.forceDrops = false; // CraftBukkit
diff --git a/src/main/java/net/minecraft/world/entity/animal/SnowGolem.java b/src/main/java/net/minecraft/world/entity/animal/SnowGolem.java
index 975a9e35303bec29aedfbd554c38e4331cdfb174..fd9f6c17448a4d87f940eb8f544ecb9669068582 100644
--- a/src/main/java/net/minecraft/world/entity/animal/SnowGolem.java
+++ b/src/main/java/net/minecraft/world/entity/animal/SnowGolem.java
@@ -161,11 +161,18 @@ public class SnowGolem extends AbstractGolem implements Shearable, RangedAttackM
ServerLevel worldserver = (ServerLevel) world;
// CraftBukkit start
- if (!CraftEventFactory.handlePlayerShearEntityEvent(player, this, itemstack, hand)) {
- return InteractionResult.PASS;
+ // Paper start - custom shear drops
+ java.util.List<ItemStack> drops = this.generateDefaultDrops(worldserver, itemstack);
+ org.bukkit.event.player.PlayerShearEntityEvent event = CraftEventFactory.handlePlayerShearEntityEvent(player, this, itemstack, hand, drops);
+ if (event != null) {
+ if (event.isCancelled()) {
+ return InteractionResult.PASS;
+ }
+ drops = org.bukkit.craftbukkit.inventory.CraftItemStack.asNMSCopy(event.getDrops());
+ // Paper end - custom shear drops
}
// CraftBukkit end
- this.shear(worldserver, SoundSource.PLAYERS, itemstack);
+ this.shear(worldserver, SoundSource.PLAYERS, itemstack, drops); // Paper - custom shear drops
this.gameEvent(GameEvent.SHEAR, player);
itemstack.hurtAndBreak(1, player, getSlotForHand(hand));
}
@@ -178,9 +185,26 @@ public class SnowGolem extends AbstractGolem implements Shearable, RangedAttackM
@Override
public void shear(ServerLevel world, SoundSource shearedSoundCategory, ItemStack shears) {
+ // Paper start - custom shear drops
+ this.shear(world, shearedSoundCategory, shears, this.generateDefaultDrops(world, shears));
+ }
+
+ @Override
+ public java.util.List<ItemStack> generateDefaultDrops(final ServerLevel serverLevel, final ItemStack shears) {
+ final java.util.List<ItemStack> drops = new it.unimi.dsi.fastutil.objects.ObjectArrayList<>();
+ this.dropFromShearingLootTable(serverLevel, BuiltInLootTables.SHEAR_SNOW_GOLEM, shears, (ignored, stack) -> {
+ drops.add(stack);
+ });
+ return drops;
+ }
+
+ @Override
+ public void shear(ServerLevel world, SoundSource shearedSoundCategory, ItemStack shears, java.util.List<ItemStack> drops) {
+ final ServerLevel worldserver1 = world; // Named for lambda consumption
+ // Paper end - custom shear drops
world.playSound((Player) null, (Entity) this, SoundEvents.SNOW_GOLEM_SHEAR, shearedSoundCategory, 1.0F, 1.0F);
this.setPumpkin(false);
- this.dropFromShearingLootTable(world, BuiltInLootTables.SHEAR_SNOW_GOLEM, shears, (worldserver1, itemstack1) -> {
+ drops.forEach(itemstack1 -> { // Paper - custom shear drops
this.forceDrops = true; // CraftBukkit
this.spawnAtLocation(worldserver1, itemstack1, this.getEyeHeight());
this.forceDrops = false; // CraftBukkit
diff --git a/src/main/java/net/minecraft/world/entity/monster/Bogged.java b/src/main/java/net/minecraft/world/entity/monster/Bogged.java
index 9d416f775fa19ad1978c7c9c9e0d5bc16728879d..18dae37d65552077aa3825c76f433bbd31152db9 100644
--- a/src/main/java/net/minecraft/world/entity/monster/Bogged.java
+++ b/src/main/java/net/minecraft/world/entity/monster/Bogged.java
@@ -27,6 +27,7 @@ import net.minecraft.world.item.Items;
import net.minecraft.world.level.Level;
import net.minecraft.world.level.gameevent.GameEvent;
import net.minecraft.world.level.storage.loot.BuiltInLootTables;
+import org.bukkit.craftbukkit.event.CraftEventFactory;
public class Bogged extends AbstractSkeleton implements Shearable {
@@ -80,12 +81,19 @@ public class Bogged extends AbstractSkeleton implements Shearable {
ServerLevel worldserver = (ServerLevel) world;
// CraftBukkit start
- if (!org.bukkit.craftbukkit.event.CraftEventFactory.handlePlayerShearEntityEvent(player, this, itemstack, hand)) {
- this.getEntityData().markDirty(Bogged.DATA_SHEARED); // CraftBukkit - mark dirty to restore sheared state to clients
- return InteractionResult.PASS;
+ // Paper start - custom shear drops
+ java.util.List<ItemStack> drops = this.generateDefaultDrops(worldserver, itemstack);
+ org.bukkit.event.player.PlayerShearEntityEvent event = CraftEventFactory.handlePlayerShearEntityEvent(player, this, itemstack, hand, drops);
+ if (event != null) {
+ if (event.isCancelled()) {
+ this.getEntityData().markDirty(Bogged.DATA_SHEARED); // CraftBukkit - mark dirty to restore sheared state to clients
+ return InteractionResult.PASS;
+ }
+ drops = org.bukkit.craftbukkit.inventory.CraftItemStack.asNMSCopy(event.getDrops());
+ // Paper end - custom shear drops
}
// CraftBukkit end
- this.shear(worldserver, SoundSource.PLAYERS, itemstack);
+ this.shear(worldserver, SoundSource.PLAYERS, itemstack, drops); // Paper - custom shear drops
this.gameEvent(GameEvent.SHEAR, player);
itemstack.hurtAndBreak(1, player, getSlotForHand(hand));
}
@@ -139,13 +147,32 @@ public class Bogged extends AbstractSkeleton implements Shearable {
@Override
public void shear(ServerLevel world, SoundSource shearedSoundCategory, ItemStack shears) {
+ // Paper start - custom shear drops
+ this.shear(world, shearedSoundCategory, shears, this.generateDefaultDrops(world, shears));
+ }
+
+ @Override
+ public java.util.List<ItemStack> generateDefaultDrops(final ServerLevel serverLevel, final ItemStack shears) {
+ final java.util.List<ItemStack> drops = new it.unimi.dsi.fastutil.objects.ObjectArrayList<>();
+ this.dropFromShearingLootTable(serverLevel, BuiltInLootTables.BOGGED_SHEAR, shears, (ignored, stack) -> {
+ drops.add(stack);
+ });
+ return drops;
+ }
+
+ @Override
+ public void shear(ServerLevel world, SoundSource shearedSoundCategory, ItemStack shears, java.util.List<ItemStack> drops) {
+ // Paper end - custom shear drops
world.playSound((Player) null, (Entity) this, SoundEvents.BOGGED_SHEAR, shearedSoundCategory, 1.0F, 1.0F);
- this.spawnShearedMushrooms(world, shears);
+ this.spawnShearedMushrooms(world, shears, drops); // Paper - custom shear drops
this.setSheared(true);
}
- private void spawnShearedMushrooms(ServerLevel world, ItemStack shears) {
- this.dropFromShearingLootTable(world, BuiltInLootTables.BOGGED_SHEAR, shears, (worldserver1, itemstack1) -> {
+ // Paper start - custom shear drops
+ private void spawnShearedMushrooms(ServerLevel world, ItemStack shears, java.util.List<ItemStack> drops) {
+ final ServerLevel worldserver1 = world; // Named for lambda consumption
+ drops.forEach(itemstack1 -> {
+ // Paper end - custom shear drops
this.spawnAtLocation(worldserver1, itemstack1, this.getBbHeight());
});
}
diff --git a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
index 1c87019f5eb8e51accef3dc7ee949cdf2bec8f72..ea4e1bf4bfe003c102ecce5958131aa86ec83864 100644
--- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
+++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
@@ -1689,20 +1689,20 @@ public class CraftEventFactory {
player.level().getCraftServer().getPluginManager().callEvent(event);
}
- public static BlockShearEntityEvent callBlockShearEntityEvent(Entity animal, org.bukkit.block.Block dispenser, CraftItemStack is) {
- BlockShearEntityEvent bse = new BlockShearEntityEvent(dispenser, animal.getBukkitEntity(), is);
+ public static BlockShearEntityEvent callBlockShearEntityEvent(Entity animal, org.bukkit.block.Block dispenser, CraftItemStack is, List<ItemStack> drops) { // Paper - custom shear drops
+ BlockShearEntityEvent bse = new BlockShearEntityEvent(dispenser, animal.getBukkitEntity(), is, Lists.transform(drops, CraftItemStack::asCraftMirror)); // Paper - custom shear drops
Bukkit.getPluginManager().callEvent(bse);
return bse;
}
- public static boolean handlePlayerShearEntityEvent(net.minecraft.world.entity.player.Player player, Entity sheared, ItemStack shears, InteractionHand hand) {
+ public static PlayerShearEntityEvent handlePlayerShearEntityEvent(net.minecraft.world.entity.player.Player player, Entity sheared, ItemStack shears, InteractionHand hand, List<ItemStack> drops) { // Paper - custom shear drops
if (!(player instanceof ServerPlayer)) {
- return true;
+ return null; // Paper - custom shear drops
}
- PlayerShearEntityEvent event = new PlayerShearEntityEvent((Player) player.getBukkitEntity(), sheared.getBukkitEntity(), CraftItemStack.asCraftMirror(shears), (hand == InteractionHand.OFF_HAND ? EquipmentSlot.OFF_HAND : EquipmentSlot.HAND));
+ PlayerShearEntityEvent event = new PlayerShearEntityEvent((Player) player.getBukkitEntity(), sheared.getBukkitEntity(), CraftItemStack.asCraftMirror(shears), (hand == InteractionHand.OFF_HAND ? EquipmentSlot.OFF_HAND : EquipmentSlot.HAND), Lists.transform(drops, CraftItemStack::asCraftMirror)); // Paper - custom shear drops
Bukkit.getPluginManager().callEvent(event);
- return !event.isCancelled();
+ return event; // Paper - custom shear drops
}
public static Cancellable handleStatisticsIncrease(net.minecraft.world.entity.player.Player entityHuman, net.minecraft.stats.Stat<?> statistic, int current, int newValue) {
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
index 0b7bc5e83634a26ac6521694377b554c74c6bff0..ffd7ba14be38a117f5a7d7035a8d71a20fb1c4fc 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
@@ -74,6 +74,16 @@ public final class CraftItemStack extends ItemStack {
return stack;
}
+ // Paper start
+ public static java.util.List<net.minecraft.world.item.ItemStack> asNMSCopy(java.util.List<? extends ItemStack> originals) {
+ final java.util.List<net.minecraft.world.item.ItemStack> items = new java.util.ArrayList<>(originals.size());
+ for (final ItemStack original : originals) {
+ items.add(asNMSCopy(original));
+ }
+ return items;
+ }
+ // Paper end
+
public static net.minecraft.world.item.ItemStack copyNMSStack(net.minecraft.world.item.ItemStack original, int amount) {
net.minecraft.world.item.ItemStack stack = original.copy();
stack.setCount(amount);
diff --git a/src/test/java/io/papermc/paper/entity/ShearableDropsTest.java b/src/test/java/io/papermc/paper/entity/ShearableDropsTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..5e6dfc93c86ec369b686f15ca066478e1635dbc3
--- /dev/null
+++ b/src/test/java/io/papermc/paper/entity/ShearableDropsTest.java
@@ -0,0 +1,35 @@
+package io.papermc.paper.entity;
+
+import io.github.classgraph.ClassGraph;
+import io.github.classgraph.ClassInfo;
+import io.github.classgraph.MethodInfoList;
+import io.github.classgraph.ScanResult;
+import java.util.ArrayList;
+import net.minecraft.world.entity.Shearable;
+import org.bukkit.support.environment.Normal;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+@Normal
+class ShearableDropsTest {
+
+ static Iterable<ClassInfo> parameters() {
+ try (ScanResult scanResult = new ClassGraph()
+ .enableClassInfo()
+ .enableMethodInfo()
+ .whitelistPackages("net.minecraft")
+ .scan()
+ ) {
+ return new ArrayList<>(scanResult.getClassesImplementing(Shearable.class.getName()));
+ }
+ }
+
+ @ParameterizedTest
+ @MethodSource("parameters")
+ void checkShearableDropOverrides(final ClassInfo classInfo) {
+ final MethodInfoList generateDefaultDrops = classInfo.getDeclaredMethodInfo("generateDefaultDrops");
+ assertEquals(1, generateDefaultDrops.size(), classInfo.getName() + " doesn't implement Shearable#generateDefaultDrops");
+ }
+}
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