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Paper/patches/server/0938-Add-drops-to-shear-events.patch

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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 fbed5d57db0c0e79996f85571b9af0071fa953c7..a024c697a65bbab27408da1d6a75e531d9719b47 100644
--- a/src/main/java/net/minecraft/core/dispenser/ShearsDispenseItemBehavior.java
+++ b/src/main/java/net/minecraft/core/dispenser/ShearsDispenseItemBehavior.java
@@ -104,11 +104,14 @@ 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());
+ if (event.isCancelled()) {
+ // Paper end - Add drops to shear events
continue;
}
// CraftBukkit end
- ishearable.shear(SoundSource.BLOCKS);
+ ishearable.shear(SoundSource.BLOCKS, 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 5e8cc5cfac8888628c6d513148f41be09ca65a2c..2ee48ac3b665db2b02bcb1a30ec972d43a3725b0 100644
--- a/src/main/java/net/minecraft/world/entity/Shearable.java
+++ b/src/main/java/net/minecraft/world/entity/Shearable.java
@@ -3,7 +3,13 @@ package net.minecraft.world.entity;
import net.minecraft.sounds.SoundSource;
public interface Shearable {
+ default void shear(SoundSource soundCategory, java.util.List<net.minecraft.world.item.ItemStack> drops) { this.shear(soundCategory); } // Paper - Add drops to shear events
void shear(SoundSource shearedSoundCategory);
boolean readyForShearing();
+ // Paper start - custom shear drops; ensure all implementing entities override this
+ default java.util.List<net.minecraft.world.item.ItemStack> generateDefaultDrops() {
+ 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 aa125e3043b120935aaa015803f065f99eb8d050..0c21959f57ae88fcd0a4d6dc911c1ce347c96528 100644
--- a/src/main/java/net/minecraft/world/entity/animal/MushroomCow.java
+++ b/src/main/java/net/minecraft/world/entity/animal/MushroomCow.java
@@ -123,11 +123,18 @@ public class MushroomCow extends Cow implements Shearable, VariantHolder<Mushroo
return InteractionResult.sidedSuccess(this.level().isClientSide);
} else if (itemstack.is(Items.SHEARS) && 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();
+ 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(SoundSource.PLAYERS);
+ this.shear(SoundSource.PLAYERS, drops); // Paper - custom shear drops
this.gameEvent(GameEvent.SHEAR, player);
if (!this.level().isClientSide) {
itemstack.hurtAndBreak(1, player, getSlotForHand(hand));
@@ -164,6 +171,22 @@ public class MushroomCow extends Cow implements Shearable, VariantHolder<Mushroo
@Override
public void shear(SoundSource shearedSoundCategory) {
+ // Paper start - custom shear drops
+ this.shear(shearedSoundCategory, this.generateDefaultDrops());
+ }
+
+ @Override
+ public java.util.List<ItemStack> generateDefaultDrops() {
+ java.util.List<ItemStack> dropEntities = new java.util.ArrayList<>(5);
+ for (int i = 0; i < 5; ++i) {
+ dropEntities.add(new ItemStack(this.getVariant().getBlockState().getBlock()));
+ }
+ return dropEntities;
+ }
+
+ @Override
+ public void shear(SoundSource shearedSoundCategory, java.util.List<ItemStack> drops) { // If drops is null, need to generate drops
+ // Paper end - custom shear drops
this.level().playSound((Player) null, (Entity) this, SoundEvents.MOOSHROOM_SHEAR, shearedSoundCategory, 1.0F, 1.0F);
if (!this.level().isClientSide()) {
Cow entitycow = (Cow) EntityType.COW.create(this.level());
@@ -193,17 +216,12 @@ public class MushroomCow extends Cow implements Shearable, VariantHolder<Mushroo
this.discard(EntityRemoveEvent.Cause.TRANSFORMATION); // CraftBukkit - from above and add Bukkit remove cause
// CraftBukkit end
- for (int i = 0; i < 5; ++i) {
- // CraftBukkit start
- ItemEntity entityitem = new ItemEntity(this.level(), this.getX(), this.getY(1.0D), this.getZ(), new ItemStack(this.getVariant().blockState.getBlock()));
- EntityDropItemEvent event = new EntityDropItemEvent(this.getBukkitEntity(), (org.bukkit.entity.Item) entityitem.getBukkitEntity());
- Bukkit.getPluginManager().callEvent(event);
- if (event.isCancelled()) {
- continue;
- }
- this.level().addFreshEntity(entityitem);
- // CraftBukkit end
+ // Paper start - custom shear drops; moved drop generation to separate method
+ for (final ItemStack drop : drops) {
+ ItemEntity entityitem = new ItemEntity(this.level(), this.getX(), this.getY(1.0D), this.getZ(), drop);
+ this.spawnAtLocation(entityitem);
}
+ // Paper end - custom shear drops
}
}
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 784a89f39e0b243e2968dca33b60ae40e58d824e..3ce86f952a18cae7fda1903916903b31a63a40b4 100644
--- a/src/main/java/net/minecraft/world/entity/animal/Sheep.java
+++ b/src/main/java/net/minecraft/world/entity/animal/Sheep.java
@@ -258,11 +258,18 @@ public class Sheep extends Animal implements Shearable {
if (itemstack.is(Items.SHEARS)) {
if (!this.level().isClientSide && 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();
+ 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(SoundSource.PLAYERS);
+ this.shear(SoundSource.PLAYERS, drops); // Paper
this.gameEvent(GameEvent.SHEAR, player);
itemstack.hurtAndBreak(1, player, getSlotForHand(hand));
return InteractionResult.SUCCESS;
@@ -276,13 +283,30 @@ public class Sheep extends Animal implements Shearable {
@Override
public void shear(SoundSource shearedSoundCategory) {
+ // Paper start - custom shear drops
+ this.shear(shearedSoundCategory, this.generateDefaultDrops());
+ }
+
+ @Override
+ public java.util.List<ItemStack> generateDefaultDrops() {
+ int count = 1 + this.random.nextInt(3);
+ java.util.List<ItemStack> dropEntities = new java.util.ArrayList<>(count);
+ for (int j = 0; j < count; ++j) {
+ dropEntities.add(new ItemStack(Sheep.ITEM_BY_DYE.get(this.getColor())));
+ }
+ return dropEntities;
+ }
+
+ @Override
+ public void shear(SoundSource shearedSoundCategory, java.util.List<ItemStack> drops) {
+ // Paper end - custom shear drops
this.level().playSound((Player) null, (Entity) this, SoundEvents.SHEEP_SHEAR, shearedSoundCategory, 1.0F, 1.0F);
this.setSheared(true);
int i = 1 + this.random.nextInt(3);
- for (int j = 0; j < i; ++j) {
+ for (final ItemStack drop : drops) { // Paper - custom shear drops (moved drop generation to separate method)
this.forceDrops = true; // CraftBukkit
- ItemEntity entityitem = this.spawnAtLocation((ItemLike) Sheep.ITEM_BY_DYE.get(this.getColor()), 1);
+ ItemEntity entityitem = this.spawnAtLocation(drop, 1); // Paper - custom shear drops
this.forceDrops = false; // CraftBukkit
if (entityitem != null) {
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 2de1a2f666da9db1832907e1651dbff948e37252..5c2ed3c39c8eb850f3be1e2ea5b5a7ea266e16d1 100644
--- a/src/main/java/net/minecraft/world/entity/animal/SnowGolem.java
+++ b/src/main/java/net/minecraft/world/entity/animal/SnowGolem.java
@@ -146,11 +146,18 @@ public class SnowGolem extends AbstractGolem implements Shearable, RangedAttackM
if (itemstack.is(Items.SHEARS) && 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();
+ 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(SoundSource.PLAYERS);
+ this.shear(SoundSource.PLAYERS, drops); // Paper
this.gameEvent(GameEvent.SHEAR, player);
if (!this.level().isClientSide) {
itemstack.hurtAndBreak(1, player, getSlotForHand(hand));
@@ -164,12 +171,28 @@ public class SnowGolem extends AbstractGolem implements Shearable, RangedAttackM
@Override
public void shear(SoundSource shearedSoundCategory) {
+ // Paper start - custom shear drops
+ this.shear(shearedSoundCategory, this.generateDefaultDrops());
+ }
+
+ @Override
+ public java.util.List<ItemStack> generateDefaultDrops() {
+ return java.util.Collections.singletonList(new ItemStack(Items.CARVED_PUMPKIN));
+ }
+
+ @Override
+ public void shear(SoundSource shearedSoundCategory, java.util.List<ItemStack> drops) {
+ // Paper end - custom shear drops
this.level().playSound((Player) null, (Entity) this, SoundEvents.SNOW_GOLEM_SHEAR, shearedSoundCategory, 1.0F, 1.0F);
if (!this.level().isClientSide()) {
this.setPumpkin(false);
- this.forceDrops = true; // CraftBukkit
- this.spawnAtLocation(new ItemStack(Items.CARVED_PUMPKIN), this.getEyeHeight());
- this.forceDrops = false; // CraftBukkit
+ // Paper start - custom shear drops (moved drop generation to separate method)
+ for (final ItemStack drop : drops) {
+ this.forceDrops = true;
+ this.spawnAtLocation(drop, this.getEyeHeight());
+ this.forceDrops = false;
+ }
+ // Paper end - custom shear drops
}
}
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 9c0bfddd479eef688d2509ad700371c3c860ff1a..e9f9b041ae7195e9d23bd446454b1d8c47a1ace1 100644
--- a/src/main/java/net/minecraft/world/entity/monster/Bogged.java
+++ b/src/main/java/net/minecraft/world/entity/monster/Bogged.java
@@ -135,6 +135,15 @@ public class Bogged extends AbstractSkeleton implements Shearable {
}
private void spawnShearedMushrooms() {
+ // Paper start - shear drops API
+ this.generateShearedMushrooms(stack -> {
+ this.forceDrops = true;
+ this.spawnAtLocation(stack);
+ this.forceDrops = false;
+ });
+ }
+ private void generateShearedMushrooms(java.util.function.Consumer<ItemStack> stackConsumer) {
+ // Paper end - shear drops API
if (this.level() instanceof ServerLevel serverLevel && serverLevel.getGameRules().getBoolean(GameRules.RULE_DOMOBLOOT)) {
LootTable lootTable = serverLevel.getServer().reloadableRegistries().getLootTable(BuiltInLootTables.BOGGED_SHEAR);
LootParams lootParams = new LootParams.Builder(serverLevel)
@@ -143,11 +152,20 @@ public class Bogged extends AbstractSkeleton implements Shearable {
.create(LootContextParamSets.SHEARING);
for (ItemStack itemStack : lootTable.getRandomItems(lootParams)) {
- this.spawnAtLocation(itemStack);
+ stackConsumer.accept(itemStack); // Paper
}
}
}
+ // Paper start - shear drops API
+ @Override
+ public java.util.List<ItemStack> generateDefaultDrops() {
+ final java.util.List<ItemStack> drops = new java.util.ArrayList<>();
+ this.generateShearedMushrooms(drops::add);
+ return drops;
+ }
+ // Paper end - shear drops API
+
@Override
public boolean readyForShearing() {
return !this.isSheared() && this.isAlive();
diff --git a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
index d94f59e6de51da2c4b261957e8bb21ba90ef9f91..df82d811e94ee466f2336b8e04bc3441474cc3d2 100644
--- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
+++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
@@ -1666,20 +1666,20 @@ 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 819e237a8797ab51b7f888b42a013c5198d8fcf6..f53d6587b2bab3ed8428338950795a62b356c694 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
@@ -65,6 +65,16 @@ 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..e612515f7709dbe5d1fa5751337cdc34fce10a98
--- /dev/null
+++ b/src/test/java/io/papermc/paper/entity/ShearableDropsTest.java
@@ -0,0 +1,34 @@
+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.AbstractTestingBase;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+class ShearableDropsTest extends AbstractTestingBase {
+
+ 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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