From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Tue, 19 Dec 2017 16:31:46 -0500
Subject: [PATCH] ExperienceOrbs API for Reason/Source/Triggering player

Adds lots of information about why this orb exists.

Replaces isFromBottle() with logic that persists entity reloads too.

diff --git a/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java b/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java
index cd3b4c97374d44f5a0e710e03f4ac38938757e25..b18bb06caf5f034dffbb72120c8f21da482ae3df 100644
--- a/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java
+++ b/src/main/java/net/minecraft/server/level/ServerPlayerGameMode.java
@@ -419,7 +419,7 @@ public class ServerPlayerGameMode {
 
                 // Drop event experience
                 if (flag && event != null) {
-                    iblockdata.getBlock().popExperience(this.level, pos, event.getExpToDrop());
+                    iblockdata.getBlock().popExperience(this.level, pos, event.getExpToDrop(), this.player); // Paper
                 }
 
                 return true;
diff --git a/src/main/java/net/minecraft/world/entity/ExperienceOrb.java b/src/main/java/net/minecraft/world/entity/ExperienceOrb.java
index b3433ce9c722bdab81848a6c2d121ca510c48509..16a1a005f2dda30cf804bf51638383ef3bfeb43e 100644
--- a/src/main/java/net/minecraft/world/entity/ExperienceOrb.java
+++ b/src/main/java/net/minecraft/world/entity/ExperienceOrb.java
@@ -37,13 +37,65 @@ public class ExperienceOrb extends Entity {
     public int value;
     private int count;
     private Player followingPlayer;
+    // Paper start
+    public java.util.UUID sourceEntityId;
+    public java.util.UUID triggerEntityId;
+    public org.bukkit.entity.ExperienceOrb.SpawnReason spawnReason = org.bukkit.entity.ExperienceOrb.SpawnReason.UNKNOWN;
+
+    private void loadPaperNBT(CompoundTag nbttagcompound) {
+        if (!nbttagcompound.contains("Paper.ExpData", 10)) { // 10 = compound
+            return;
+        }
+        CompoundTag comp = nbttagcompound.getCompound("Paper.ExpData");
+        if (comp.hasUUID("source")) {
+            this.sourceEntityId = comp.getUUID("source");
+        }
+        if (comp.hasUUID("trigger")) {
+            this.triggerEntityId = comp.getUUID("trigger");
+        }
+        if (comp.contains("reason")) {
+            String reason = comp.getString("reason");
+            try {
+                this.spawnReason = org.bukkit.entity.ExperienceOrb.SpawnReason.valueOf(reason);
+            } catch (Exception e) {
+                this.level.getCraftServer().getLogger().warning("Invalid spawnReason set for experience orb: " + e.getMessage() + " - " + reason);
+            }
+        }
+    }
+    private void savePaperNBT(CompoundTag nbttagcompound) {
+        CompoundTag comp = new CompoundTag();
+        if (this.sourceEntityId != null) {
+            comp.putUUID("source", this.sourceEntityId);
+        }
+        if (this.triggerEntityId != null) {
+            comp.putUUID("trigger", triggerEntityId);
+        }
+        if (this.spawnReason != null && this.spawnReason != org.bukkit.entity.ExperienceOrb.SpawnReason.UNKNOWN) {
+            comp.putString("reason", this.spawnReason.name());
+        }
+        nbttagcompound.put("Paper.ExpData", comp);
+    }
 
+    @io.papermc.paper.annotation.DoNotUse
+    @Deprecated
     public ExperienceOrb(Level world, double x, double y, double z, int amount) {
+        this(world, x, y, z, amount, null, null);
+    }
+
+    public ExperienceOrb(Level world, double d0, double d1, double d2, int i, org.bukkit.entity.ExperienceOrb.SpawnReason reason, Entity triggerId) {
+        this(world, d0, d1, d2, i, reason, triggerId, null);
+    }
+
+    public ExperienceOrb(Level world, double d0, double d1, double d2, int i, org.bukkit.entity.ExperienceOrb.SpawnReason reason, Entity triggerId, Entity sourceId) {
         this(EntityType.EXPERIENCE_ORB, world);
-        this.setPos(x, y, z);
+        this.sourceEntityId = sourceId != null ? sourceId.getUUID() : null;
+        this.triggerEntityId = triggerId != null ? triggerId.getUUID() : null;
+        this.spawnReason = reason != null ? reason : org.bukkit.entity.ExperienceOrb.SpawnReason.UNKNOWN;
+        // Paper end
+        this.setPos(d0, d1, d2);
         this.setYRot((float) (this.random.nextDouble() * 360.0D));
         this.setDeltaMovement((this.random.nextDouble() * 0.20000000298023224D - 0.10000000149011612D) * 2.0D, this.random.nextDouble() * 0.2D * 2.0D, (this.random.nextDouble() * 0.20000000298023224D - 0.10000000149011612D) * 2.0D);
-        this.value = amount;
+        this.value = i;
     }
 
     public ExperienceOrb(EntityType<? extends ExperienceOrb> type, Level world) {
@@ -153,12 +205,20 @@ public class ExperienceOrb extends Entity {
     }
 
     public static void award(ServerLevel world, Vec3 pos, int amount) {
+        // Paper start - add reasons for orbs
+        award(world, pos, amount, null, null, null);
+    }
+    public static void award(ServerLevel world, Vec3 pos, int amount, org.bukkit.entity.ExperienceOrb.SpawnReason reason, Entity triggerId) {
+        award(world, pos, amount, reason, triggerId, null);
+    }
+    public static void award(ServerLevel world, Vec3 pos, int amount, org.bukkit.entity.ExperienceOrb.SpawnReason reason, Entity triggerId, Entity sourceId) {
+        // Paper end - add reasons for orbs
         while (amount > 0) {
             int j = ExperienceOrb.getExperienceValue(amount);
 
             amount -= j;
             if (!ExperienceOrb.tryMergeToExisting(world, pos, j)) {
-                world.addFreshEntity(new ExperienceOrb(world, pos.x(), pos.y(), pos.z(), j));
+                world.addFreshEntity(new ExperienceOrb(world, pos.x(), pos.y(), pos.z(), j, reason, triggerId, sourceId)); // Paper - add reason
             }
         }
 
@@ -228,6 +288,7 @@ public class ExperienceOrb extends Entity {
         nbt.putShort("Age", (short) this.age);
         nbt.putShort("Value", (short) this.value);
         nbt.putInt("Count", this.count);
+        this.savePaperNBT(nbt); // Paper
     }
 
     @Override
@@ -236,6 +297,7 @@ public class ExperienceOrb extends Entity {
         this.age = nbt.getShort("Age");
         this.value = nbt.getShort("Value");
         this.count = Math.max(nbt.getInt("Count"), 1);
+        this.loadPaperNBT(nbt); // Paper
     }
 
     @Override
diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
index d33495915e63e4cae16b3c1ed536bae916a944d9..9f6629189a126c12a2d45098e12f41d8e45147a4 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -1723,7 +1723,8 @@ public abstract class LivingEntity extends Entity {
     protected void dropExperience() {
         // CraftBukkit start - Update getExpReward() above if the removed if() changes!
         if (true && !(this instanceof net.minecraft.world.entity.boss.enderdragon.EnderDragon)) { // CraftBukkit - SPIGOT-2420: Special case ender dragon will drop the xp over time
-            ExperienceOrb.award((ServerLevel) this.level, this.position(), this.expToDrop);
+            LivingEntity attacker = this.lastHurtByPlayer != null ? this.lastHurtByPlayer : this.lastHurtByMob; // Paper
+            ExperienceOrb.award((ServerLevel) this.level, this.position(), this.expToDrop, this instanceof ServerPlayer ? org.bukkit.entity.ExperienceOrb.SpawnReason.PLAYER_DEATH : org.bukkit.entity.ExperienceOrb.SpawnReason.ENTITY_DEATH, attacker, this); // Paper
             this.expToDrop = 0;
         }
         // CraftBukkit end
diff --git a/src/main/java/net/minecraft/world/entity/animal/Animal.java b/src/main/java/net/minecraft/world/entity/animal/Animal.java
index 3cdd7180a41b87caa942d2b3436ba90726686ecb..6216513805add7c8f52e1ed6c77e2d26786b3ab5 100644
--- a/src/main/java/net/minecraft/world/entity/animal/Animal.java
+++ b/src/main/java/net/minecraft/world/entity/animal/Animal.java
@@ -262,7 +262,7 @@ public abstract class Animal extends AgeableMob {
             if (world.getGameRules().getBoolean(GameRules.RULE_DOMOBLOOT)) {
                 // CraftBukkit start - use event experience
                 if (experience > 0) {
-                    world.addFreshEntity(new ExperienceOrb(world, this.getX(), this.getY(), this.getZ(), experience));
+                    world.addFreshEntity(new ExperienceOrb(world, this.getX(), this.getY(), this.getZ(), experience, org.bukkit.entity.ExperienceOrb.SpawnReason.BREED, entityplayer, entityageable)); // Paper
                 }
                 // CraftBukkit end
             }
diff --git a/src/main/java/net/minecraft/world/entity/animal/Fox.java b/src/main/java/net/minecraft/world/entity/animal/Fox.java
index 113b31a5a0247abc436d04ba2fe03cb41ca86f15..fb3b42611d8386b110ea079094d5d50fefceac1a 100644
--- a/src/main/java/net/minecraft/world/entity/animal/Fox.java
+++ b/src/main/java/net/minecraft/world/entity/animal/Fox.java
@@ -892,7 +892,7 @@ public class Fox extends Animal {
                 if (this.level.getGameRules().getBoolean(GameRules.RULE_DOMOBLOOT)) {
                     // CraftBukkit start - use event experience
                     if (experience > 0) {
-                        this.level.addFreshEntity(new ExperienceOrb(this.level, this.animal.getX(), this.animal.getY(), this.animal.getZ(), experience));
+                        this.level.addFreshEntity(new ExperienceOrb(this.level, this.animal.getX(), this.animal.getY(), this.animal.getZ(), experience, org.bukkit.entity.ExperienceOrb.SpawnReason.BREED, entityplayer, entityfox)); // Paper
                     }
                     // CraftBukkit end
                 }
diff --git a/src/main/java/net/minecraft/world/entity/animal/Turtle.java b/src/main/java/net/minecraft/world/entity/animal/Turtle.java
index 7c90063be2a7eb66b7f0981059018f20413256c6..37125ffe47fcd5fe93ab62ad8a46e8188f362436 100644
--- a/src/main/java/net/minecraft/world/entity/animal/Turtle.java
+++ b/src/main/java/net/minecraft/world/entity/animal/Turtle.java
@@ -448,7 +448,7 @@ public class Turtle extends Animal {
             RandomSource randomsource = this.animal.getRandom();
 
             if (this.level.getGameRules().getBoolean(GameRules.RULE_DOMOBLOOT)) {
-                this.level.addFreshEntity(new ExperienceOrb(this.level, this.animal.getX(), this.animal.getY(), this.animal.getZ(), randomsource.nextInt(7) + 1));
+                this.level.addFreshEntity(new ExperienceOrb(this.level, this.animal.getX(), this.animal.getY(), this.animal.getZ(), randomsource.nextInt(7) + 1, org.bukkit.entity.ExperienceOrb.SpawnReason.BREED, entityplayer)); // Paper;
             }
 
         }
diff --git a/src/main/java/net/minecraft/world/entity/animal/frog/Frog.java b/src/main/java/net/minecraft/world/entity/animal/frog/Frog.java
index fe660bbaa4113fb2ffa1ea2f10e4e1e674fbb86d..bb6063ae7f4438916306ce876057f7488537b444 100644
--- a/src/main/java/net/minecraft/world/entity/animal/frog/Frog.java
+++ b/src/main/java/net/minecraft/world/entity/animal/frog/Frog.java
@@ -274,7 +274,7 @@ public class Frog extends Animal {
         this.getBrain().setMemory(MemoryModuleType.IS_PREGNANT, Unit.INSTANCE);
         world.broadcastEntityEvent(this, (byte)18);
         if (world.getGameRules().getBoolean(GameRules.RULE_DOMOBLOOT)) {
-            world.addFreshEntity(new ExperienceOrb(world, this.getX(), this.getY(), this.getZ(), this.getRandom().nextInt(7) + 1));
+            world.addFreshEntity(new ExperienceOrb(world, this.getX(), this.getY(), this.getZ(), this.getRandom().nextInt(7) + 1, org.bukkit.entity.ExperienceOrb.SpawnReason.BREED, serverPlayer)); // Paper
         }
 
     }
diff --git a/src/main/java/net/minecraft/world/entity/boss/enderdragon/EnderDragon.java b/src/main/java/net/minecraft/world/entity/boss/enderdragon/EnderDragon.java
index 0dff7a47ecac1916ad23739fbb06ddd0f0052a65..d0ebcc23d863be630b55245aa2604c108ee6c93a 100644
--- a/src/main/java/net/minecraft/world/entity/boss/enderdragon/EnderDragon.java
+++ b/src/main/java/net/minecraft/world/entity/boss/enderdragon/EnderDragon.java
@@ -647,7 +647,7 @@ public class EnderDragon extends Mob implements Enemy {
 
         if (this.level instanceof ServerLevel) {
             if (this.dragonDeathTime > 150 && this.dragonDeathTime % 5 == 0 && true) {  // CraftBukkit - SPIGOT-2420: Already checked for the game rule when calculating the xp
-                ExperienceOrb.award((ServerLevel) this.level, this.position(), Mth.floor((float) short0 * 0.08F));
+                ExperienceOrb.award((ServerLevel) this.level, this.position(), Mth.floor((float) short0 * 0.08F), org.bukkit.entity.ExperienceOrb.SpawnReason.ENTITY_DEATH, this.lastHurtByPlayer, this); // Paper
             }
 
             if (this.dragonDeathTime == 1 && !this.isSilent()) {
@@ -678,7 +678,7 @@ public class EnderDragon extends Mob implements Enemy {
         this.yBodyRot = this.getYRot();
         if (this.dragonDeathTime == 200 && this.level instanceof ServerLevel) {
             if (true) { // CraftBukkit - SPIGOT-2420: Already checked for the game rule when calculating the xp
-                ExperienceOrb.award((ServerLevel) this.level, this.position(), Mth.floor((float) short0 * 0.2F));
+                ExperienceOrb.award((ServerLevel) this.level, this.position(), Mth.floor((float) short0 * 0.2F), org.bukkit.entity.ExperienceOrb.SpawnReason.ENTITY_DEATH, this.lastHurtByPlayer, this); // Paper
             }
 
             if (this.dragonFight != null) {
diff --git a/src/main/java/net/minecraft/world/entity/npc/Villager.java b/src/main/java/net/minecraft/world/entity/npc/Villager.java
index 33d1a6b31afec4dbeb00dcabf50c5840852102d6..25cd8a4101cf44955d95924c9794c238ddde2901 100644
--- a/src/main/java/net/minecraft/world/entity/npc/Villager.java
+++ b/src/main/java/net/minecraft/world/entity/npc/Villager.java
@@ -624,7 +624,7 @@ public class Villager extends AbstractVillager implements ReputationEventHandler
         }
 
         if (offer.shouldRewardExp()) {
-            this.level.addFreshEntity(new ExperienceOrb(this.level, this.getX(), this.getY() + 0.5D, this.getZ(), i));
+            this.level.addFreshEntity(new ExperienceOrb(this.level, this.getX(), this.getY() + 0.5D, this.getZ(), i, org.bukkit.entity.ExperienceOrb.SpawnReason.VILLAGER_TRADE, this.getTradingPlayer(), this)); // Paper
         }
 
     }
diff --git a/src/main/java/net/minecraft/world/entity/npc/WanderingTrader.java b/src/main/java/net/minecraft/world/entity/npc/WanderingTrader.java
index b9a0fc52460ce0c50deea25112dee20c977e99c5..d7cb3d8b37f225ee4796246aa907da1092fa9a0d 100644
--- a/src/main/java/net/minecraft/world/entity/npc/WanderingTrader.java
+++ b/src/main/java/net/minecraft/world/entity/npc/WanderingTrader.java
@@ -186,7 +186,7 @@ public class WanderingTrader extends net.minecraft.world.entity.npc.AbstractVill
         if (offer.shouldRewardExp()) {
             int i = 3 + this.random.nextInt(4);
 
-            this.level.addFreshEntity(new ExperienceOrb(this.level, this.getX(), this.getY() + 0.5D, this.getZ(), i));
+            this.level.addFreshEntity(new ExperienceOrb(this.level, this.getX(), this.getY() + 0.5D, this.getZ(), i, org.bukkit.entity.ExperienceOrb.SpawnReason.VILLAGER_TRADE, this.getTradingPlayer(), this)); // Paper
         }
 
     }
diff --git a/src/main/java/net/minecraft/world/entity/projectile/FishingHook.java b/src/main/java/net/minecraft/world/entity/projectile/FishingHook.java
index 00fe96650e4d973e97b46968297f55f4c3674629..11ac510ad4095438d4904d521bfb18aa5f743faf 100644
--- a/src/main/java/net/minecraft/world/entity/projectile/FishingHook.java
+++ b/src/main/java/net/minecraft/world/entity/projectile/FishingHook.java
@@ -513,7 +513,7 @@ public class FishingHook extends Projectile {
                     this.level.addFreshEntity(entityitem);
                     // CraftBukkit start - this.random.nextInt(6) + 1 -> playerFishEvent.getExpToDrop()
                     if (playerFishEvent.getExpToDrop() > 0) {
-                        entityhuman.level.addFreshEntity(new ExperienceOrb(entityhuman.level, entityhuman.getX(), entityhuman.getY() + 0.5D, entityhuman.getZ() + 0.5D, playerFishEvent.getExpToDrop()));
+                        entityhuman.level.addFreshEntity(new ExperienceOrb(entityhuman.level, entityhuman.getX(), entityhuman.getY() + 0.5D, entityhuman.getZ() + 0.5D, playerFishEvent.getExpToDrop(), org.bukkit.entity.ExperienceOrb.SpawnReason.FISHING, this.getPlayerOwner(), this)); // Paper
                     }
                     // CraftBukkit end
                     if (itemstack1.is(ItemTags.FISHES)) {
diff --git a/src/main/java/net/minecraft/world/entity/projectile/ThrownExperienceBottle.java b/src/main/java/net/minecraft/world/entity/projectile/ThrownExperienceBottle.java
index db6b1a9804a6d75dce22b780044beb04ca69cc94..dcbbff3a8dfcac869f07025e0e8e3d9c47956093 100644
--- a/src/main/java/net/minecraft/world/entity/projectile/ThrownExperienceBottle.java
+++ b/src/main/java/net/minecraft/world/entity/projectile/ThrownExperienceBottle.java
@@ -51,7 +51,7 @@ public class ThrownExperienceBottle extends ThrowableItemProjectile {
             }
             // CraftBukkit end
 
-            ExperienceOrb.award((ServerLevel) this.level, this.position(), i);
+            ExperienceOrb.award((ServerLevel) this.level, this.position(), i, org.bukkit.entity.ExperienceOrb.SpawnReason.EXP_BOTTLE, this.getOwner(), this); // Paper
             this.discard();
         }
 
diff --git a/src/main/java/net/minecraft/world/inventory/GrindstoneMenu.java b/src/main/java/net/minecraft/world/inventory/GrindstoneMenu.java
index dbdba510d8ff3c622ed928151cf525cfd1d1b1b5..aa0ba9c7dcb0ee81c9081031c447eeab61d92a10 100644
--- a/src/main/java/net/minecraft/world/inventory/GrindstoneMenu.java
+++ b/src/main/java/net/minecraft/world/inventory/GrindstoneMenu.java
@@ -97,7 +97,7 @@ public class GrindstoneMenu extends AbstractContainerMenu {
             public void onTake(net.minecraft.world.entity.player.Player player, ItemStack stack) {
                 context.execute((world, blockposition) -> {
                     if (world instanceof ServerLevel) {
-                        ExperienceOrb.award((ServerLevel) world, Vec3.atCenterOf(blockposition), this.getExperienceAmount(world));
+                        ExperienceOrb.award((ServerLevel) world, Vec3.atCenterOf(blockposition), this.getExperienceAmount(world), org.bukkit.entity.ExperienceOrb.SpawnReason.GRINDSTONE, player); // Paper
                     }
 
                     world.levelEvent(1042, blockposition, 0);
diff --git a/src/main/java/net/minecraft/world/level/block/Block.java b/src/main/java/net/minecraft/world/level/block/Block.java
index 4b3dc4648709abbdd6ac0972c298a64a875e5f6c..77125720fcbeb7bfc180effb27cfb78c74832ce5 100644
--- a/src/main/java/net/minecraft/world/level/block/Block.java
+++ b/src/main/java/net/minecraft/world/level/block/Block.java
@@ -376,8 +376,13 @@ public class Block extends BlockBehaviour implements ItemLike {
     }
 
     public void popExperience(ServerLevel world, BlockPos pos, int size) {
+        // Paper start - add player parameter
+        popExperience(world, pos, size, null);
+    }
+    public void popExperience(ServerLevel world, BlockPos pos, int size, net.minecraft.server.level.ServerPlayer player) {
+        // Paper end - add player parameter
         if (world.getGameRules().getBoolean(GameRules.RULE_DOBLOCKDROPS)) {
-            ExperienceOrb.award(world, Vec3.atCenterOf(pos), size);
+            ExperienceOrb.award(world, Vec3.atCenterOf(pos), size, org.bukkit.entity.ExperienceOrb.SpawnReason.BLOCK_BREAK, player); // Paper
         }
 
     }
diff --git a/src/main/java/net/minecraft/world/level/block/entity/AbstractFurnaceBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/AbstractFurnaceBlockEntity.java
index e90fa66b4716f55844818a2770d9e02d68658e46..bbccb2f97ee88fe43af4eec30fbb2ecea1ebb1b4 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/AbstractFurnaceBlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/AbstractFurnaceBlockEntity.java
@@ -642,7 +642,7 @@ public abstract class AbstractFurnaceBlockEntity extends BaseContainerBlockEntit
         j = event.getExpToDrop();
         // CraftBukkit end
 
-        ExperienceOrb.award(worldserver, vec3d, j);
+        ExperienceOrb.award(worldserver, vec3d, j, org.bukkit.entity.ExperienceOrb.SpawnReason.FURNACE, entityhuman); // Paper
     }
 
     @Override
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java b/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java
index e1f478359d959157f60b866ab59bba3b5b16521c..c4f8d2c090e3cde562a2ab6103da53ded666599b 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java
@@ -909,7 +909,7 @@ public abstract class CraftRegionAccessor implements RegionAccessor {
         } else if (TNTPrimed.class.isAssignableFrom(clazz)) {
             entity = new PrimedTnt(world, x, y, z, null);
         } else if (ExperienceOrb.class.isAssignableFrom(clazz)) {
-            entity = new net.minecraft.world.entity.ExperienceOrb(world, x, y, z, 0);
+            entity = new net.minecraft.world.entity.ExperienceOrb(world, x, y, z, 0, org.bukkit.entity.ExperienceOrb.SpawnReason.CUSTOM, null, null); // Paper
         } else if (LightningStrike.class.isAssignableFrom(clazz)) {
             entity = net.minecraft.world.entity.EntityType.LIGHTNING_BOLT.create(world);
             entity.moveTo(location.getX(), location.getY(), location.getZ());
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftExperienceOrb.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftExperienceOrb.java
index 40713228b149b4532fcee3a54bbe63e161318258..84899284703baeb04bfc79251941265d52ac07e8 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftExperienceOrb.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftExperienceOrb.java
@@ -19,6 +19,18 @@ public class CraftExperienceOrb extends CraftEntity implements ExperienceOrb {
         this.getHandle().value = value;
     }
 
+    // Paper start
+    public java.util.UUID getTriggerEntityId() {
+        return getHandle().triggerEntityId;
+    }
+    public java.util.UUID getSourceEntityId() {
+        return getHandle().sourceEntityId;
+    }
+    public SpawnReason getSpawnReason() {
+        return getHandle().spawnReason;
+    }
+    // Paper end
+
     @Override
     public net.minecraft.world.entity.ExperienceOrb getHandle() {
         return (net.minecraft.world.entity.ExperienceOrb) entity;