From 4194fadfef71e639deaa66ce9b3d6702384d326c 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/Block.java b/src/main/java/net/minecraft/server/Block.java
index fd23d45346..69e65ea6c8 100644
--- a/src/main/java/net/minecraft/server/Block.java
+++ b/src/main/java/net/minecraft/server/Block.java
@@ -504,13 +504,13 @@ public class Block implements IMaterial {
         }
     }
 
-    protected void dropExperience(World world, BlockPosition blockposition, int i) {
+    protected void dropExperience(World world, BlockPosition blockposition, int i, EntityPlayer player) { // Paper
         if (!world.isClientSide && world.getGameRules().getBoolean("doTileDrops")) {
             while (i > 0) {
                 int j = EntityExperienceOrb.getOrbValue(i);
 
                 i -= j;
-                world.addEntity(new EntityExperienceOrb(world, (double) blockposition.getX() + 0.5D, (double) blockposition.getY() + 0.5D, (double) blockposition.getZ() + 0.5D, j));
+                world.addEntity(new EntityExperienceOrb(world, (double) blockposition.getX() + 0.5D, (double) blockposition.getY() + 0.5D, (double) blockposition.getZ() + 0.5D, j, org.bukkit.entity.ExperienceOrb.SpawnReason.BLOCK_BREAK, player)); // Paper
             }
         }
 
diff --git a/src/main/java/net/minecraft/server/ContainerGrindstone.java b/src/main/java/net/minecraft/server/ContainerGrindstone.java
index 2e4f81ebe4..88b9655bb0 100644
--- a/src/main/java/net/minecraft/server/ContainerGrindstone.java
+++ b/src/main/java/net/minecraft/server/ContainerGrindstone.java
@@ -81,7 +81,7 @@ public class ContainerGrindstone extends Container {
                         int k = EntityExperienceOrb.getOrbValue(j);
 
                         j -= k;
-                        world.addEntity(new EntityExperienceOrb(world, (double) blockposition.getX(), (double) blockposition.getY() + 0.5D, (double) blockposition.getZ() + 0.5D, k));
+                        world.addEntity(new EntityExperienceOrb(world, (double) blockposition.getX(), (double) blockposition.getY() + 0.5D, (double) blockposition.getZ() + 0.5D, k, org.bukkit.entity.ExperienceOrb.SpawnReason.GRINDSTONE, entityhuman)); // Paper
                     }
 
                     world.triggerEffect(1042, blockposition, 0);
diff --git a/src/main/java/net/minecraft/server/EntityEnderDragon.java b/src/main/java/net/minecraft/server/EntityEnderDragon.java
index 2ee80c2863..b0651a7086 100644
--- a/src/main/java/net/minecraft/server/EntityEnderDragon.java
+++ b/src/main/java/net/minecraft/server/EntityEnderDragon.java
@@ -607,7 +607,7 @@ public class EntityEnderDragon extends EntityInsentient implements IMonster {
             int j = EntityExperienceOrb.getOrbValue(i);
 
             i -= j;
-            this.world.addEntity(new EntityExperienceOrb(this.world, this.locX, this.locY, this.locZ, j));
+            this.world.addEntity(new EntityExperienceOrb(this.world, this.locX, this.locY, this.locZ, j, org.bukkit.entity.ExperienceOrb.SpawnReason.ENTITY_DEATH, this.killer, this)); // Paper
         }
 
     }
diff --git a/src/main/java/net/minecraft/server/EntityExperienceOrb.java b/src/main/java/net/minecraft/server/EntityExperienceOrb.java
index bfba08fb24..49668f2c21 100644
--- a/src/main/java/net/minecraft/server/EntityExperienceOrb.java
+++ b/src/main/java/net/minecraft/server/EntityExperienceOrb.java
@@ -16,9 +16,59 @@ public class EntityExperienceOrb extends Entity {
     public int value;
     private EntityHuman targetPlayer;
     private int targetTime;
+    // 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(NBTTagCompound nbttagcompound) {
+        if (!nbttagcompound.hasKeyOfType("Paper.ExpData", 10)) { // 10 = compound
+            return;
+        }
+        NBTTagCompound 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.hasKey("reason")) {
+            String reason = comp.getString("reason");
+            try {
+                this.spawnReason = org.bukkit.entity.ExperienceOrb.SpawnReason.valueOf(reason);
+            } catch (Exception e) {
+                this.world.getServer().getLogger().warning("Invalid spawnReason set for experience orb: " + e.getMessage() + " - " + reason);
+            }
+        }
+    }
+    private void savePaperNBT(NBTTagCompound nbttagcompound) {
+        NBTTagCompound comp = new NBTTagCompound();
+        if (this.sourceEntityId != null) {
+            comp.setUUID("source", this.sourceEntityId);
+        }
+        if (this.triggerEntityId != null) {
+            comp.setUUID("trigger", triggerEntityId);
+        }
+        if (this.spawnReason != null && this.spawnReason != org.bukkit.entity.ExperienceOrb.SpawnReason.UNKNOWN) {
+            comp.setString("reason", this.spawnReason.name());
+        }
+        nbttagcompound.set("Paper.ExpData", comp);
+    }
 
     public EntityExperienceOrb(World world, double d0, double d1, double d2, int i) {
+        this(world, d0, d1, d2, i, null, null);
+    }
+
+    public EntityExperienceOrb(World 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 EntityExperienceOrb(World world, double d0, double d1, double d2, int i, org.bukkit.entity.ExperienceOrb.SpawnReason reason, Entity triggerId, Entity sourceId) {
         this(EntityTypes.EXPERIENCE_ORB, world);
+        this.sourceEntityId = sourceId != null ? sourceId.getUniqueID() : null;
+        this.triggerEntityId = triggerId != null ? triggerId.getUniqueID() : null;
+        this.spawnReason = reason != null ? reason : org.bukkit.entity.ExperienceOrb.SpawnReason.UNKNOWN;
+        // Paper end
         this.setPosition(d0, d1, d2);
         this.yaw = (float) (this.random.nextDouble() * 360.0D);
         this.setMot((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);
@@ -155,6 +205,7 @@ public class EntityExperienceOrb extends Entity {
         nbttagcompound.setShort("Health", (short) this.e);
         nbttagcompound.setShort("Age", (short) this.c);
         nbttagcompound.setShort("Value", (short) this.value);
+        this.savePaperNBT(nbttagcompound); // Paper
     }
 
     @Override
@@ -162,6 +213,7 @@ public class EntityExperienceOrb extends Entity {
         this.e = nbttagcompound.getShort("Health");
         this.c = nbttagcompound.getShort("Age");
         this.value = nbttagcompound.getShort("Value");
+        this.loadPaperNBT(nbttagcompound); // Paper
     }
 
     @Override
diff --git a/src/main/java/net/minecraft/server/EntityFishingHook.java b/src/main/java/net/minecraft/server/EntityFishingHook.java
index 78527f3509..03f782d4b9 100644
--- a/src/main/java/net/minecraft/server/EntityFishingHook.java
+++ b/src/main/java/net/minecraft/server/EntityFishingHook.java
@@ -404,7 +404,7 @@ public class EntityFishingHook extends Entity {
                     this.world.addEntity(entityitem);
                     // CraftBukkit start - this.random.nextInt(6) + 1 -> playerFishEvent.getExpToDrop()
                     if (playerFishEvent.getExpToDrop() > 0) {
-                        this.owner.world.addEntity(new EntityExperienceOrb(this.owner.world, this.owner.locX, this.owner.locY + 0.5D, this.owner.locZ + 0.5D, playerFishEvent.getExpToDrop()));
+                        this.owner.world.addEntity(new EntityExperienceOrb(this.owner.world, this.owner.locX, this.owner.locY + 0.5D, this.owner.locZ + 0.5D, playerFishEvent.getExpToDrop(), org.bukkit.entity.ExperienceOrb.SpawnReason.FISHING, this.owner, this)); // Paper
                     }
                     // CraftBukkit end
                     if (itemstack1.getItem().a(TagsItem.FISHES)) {
diff --git a/src/main/java/net/minecraft/server/EntityLiving.java b/src/main/java/net/minecraft/server/EntityLiving.java
index 482d6f7c62..567112ffc7 100644
--- a/src/main/java/net/minecraft/server/EntityLiving.java
+++ b/src/main/java/net/minecraft/server/EntityLiving.java
@@ -381,7 +381,8 @@ public abstract class EntityLiving extends Entity {
                 int j = EntityExperienceOrb.getOrbValue(i);
 
                 i -= j;
-                this.world.addEntity(new EntityExperienceOrb(this.world, this.locX, this.locY, this.locZ, j));
+                EntityLiving attacker = killer != null ? killer : lastDamager; // Paper
+                this.world.addEntity(new EntityExperienceOrb(this.world, this.locX, this.locY, this.locZ, j, this instanceof EntityPlayer ? 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/server/EntityThrownExpBottle.java b/src/main/java/net/minecraft/server/EntityThrownExpBottle.java
index 77dd4c99a6..398b499bbe 100644
--- a/src/main/java/net/minecraft/server/EntityThrownExpBottle.java
+++ b/src/main/java/net/minecraft/server/EntityThrownExpBottle.java
@@ -43,7 +43,7 @@ public class EntityThrownExpBottle extends EntityProjectileThrowable {
                 int j = EntityExperienceOrb.getOrbValue(i);
 
                 i -= j;
-                this.world.addEntity(new EntityExperienceOrb(this.world, this.locX, this.locY, this.locZ, j));
+                this.world.addEntity(new EntityExperienceOrb(this.world, this.locX, this.locY, this.locZ, j, org.bukkit.entity.ExperienceOrb.SpawnReason.EXP_BOTTLE, getShooter(), this)); // Paper
             }
 
             this.die();
diff --git a/src/main/java/net/minecraft/server/EntityTurtle.java b/src/main/java/net/minecraft/server/EntityTurtle.java
index 7c6506a912..1b4933c077 100644
--- a/src/main/java/net/minecraft/server/EntityTurtle.java
+++ b/src/main/java/net/minecraft/server/EntityTurtle.java
@@ -512,7 +512,7 @@ public class EntityTurtle extends EntityAnimal {
             Random random = this.animal.getRandom();
 
             if (this.b.getGameRules().getBoolean("doMobLoot")) {
-                this.b.addEntity(new EntityExperienceOrb(this.b, this.animal.locX, this.animal.locY, this.animal.locZ, random.nextInt(7) + 1));
+                this.b.addEntity(new EntityExperienceOrb(this.b, this.animal.locX, this.animal.locY, this.animal.locZ, random.nextInt(7) + 1, org.bukkit.entity.ExperienceOrb.SpawnReason.BREED, entityplayer)); // Paper
             }
 
         }
diff --git a/src/main/java/net/minecraft/server/EntityVillager.java b/src/main/java/net/minecraft/server/EntityVillager.java
index c348683247..bc04086d79 100644
--- a/src/main/java/net/minecraft/server/EntityVillager.java
+++ b/src/main/java/net/minecraft/server/EntityVillager.java
@@ -421,7 +421,7 @@ public class EntityVillager extends EntityVillagerAbstract implements Reputation
         }
 
         if (merchantrecipe.q()) {
-            this.world.addEntity(new EntityExperienceOrb(this.world, this.locX, this.locY + 0.5D, this.locZ, i));
+            this.world.addEntity(new EntityExperienceOrb(this.world, this.locX, this.locY + 0.5D, this.locZ, i, org.bukkit.entity.ExperienceOrb.SpawnReason.VILLAGER_TRADE, this.getTrader(), this)); // Paper
         }
 
     }
diff --git a/src/main/java/net/minecraft/server/EntityVillagerTrader.java b/src/main/java/net/minecraft/server/EntityVillagerTrader.java
index 1d612d828e..002ff88800 100644
--- a/src/main/java/net/minecraft/server/EntityVillagerTrader.java
+++ b/src/main/java/net/minecraft/server/EntityVillagerTrader.java
@@ -147,7 +147,7 @@ public class EntityVillagerTrader extends EntityVillagerAbstract {
         if (merchantrecipe.q()) {
             int i = 3 + this.random.nextInt(4);
 
-            this.world.addEntity(new EntityExperienceOrb(this.world, this.locX, this.locY + 0.5D, this.locZ, i));
+            this.world.addEntity(new EntityExperienceOrb(this.world, this.locX, this.locY + 0.5D, this.locZ, i, org.bukkit.entity.ExperienceOrb.SpawnReason.VILLAGER_TRADE, this.getTrader(), this)); // Paper
         }
 
     }
diff --git a/src/main/java/net/minecraft/server/PathfinderGoalBreed.java b/src/main/java/net/minecraft/server/PathfinderGoalBreed.java
index d25a05736e..9d0b1ffefa 100644
--- a/src/main/java/net/minecraft/server/PathfinderGoalBreed.java
+++ b/src/main/java/net/minecraft/server/PathfinderGoalBreed.java
@@ -117,7 +117,7 @@ public class PathfinderGoalBreed extends PathfinderGoal {
             if (this.b.getGameRules().getBoolean("doMobLoot")) {
                 // CraftBukkit start - use event experience
                 if (experience > 0) {
-                    this.b.addEntity(new EntityExperienceOrb(this.b, this.animal.locX, this.animal.locY, this.animal.locZ, experience));
+                    this.b.addEntity(new EntityExperienceOrb(this.b, this.animal.locX, this.animal.locY, this.animal.locZ, experience, org.bukkit.entity.ExperienceOrb.SpawnReason.BREED, entityplayer, entityageable)); // Paper
                 }
                 // CraftBukkit end
             }
diff --git a/src/main/java/net/minecraft/server/PlayerInteractManager.java b/src/main/java/net/minecraft/server/PlayerInteractManager.java
index 6e90f21ea2..a7411c75ac 100644
--- a/src/main/java/net/minecraft/server/PlayerInteractManager.java
+++ b/src/main/java/net/minecraft/server/PlayerInteractManager.java
@@ -367,7 +367,7 @@ public class PlayerInteractManager {
 
                 // CraftBukkit start - Drop event experience
                 if (flag && event != null) {
-                    iblockdata.getBlock().dropExperience(this.world, blockposition, event.getExpToDrop());
+                    iblockdata.getBlock().dropExperience(this.world, blockposition, event.getExpToDrop(), this.player); // Paper
                 }
                 // CraftBukkit end
 
diff --git a/src/main/java/net/minecraft/server/SlotFurnaceResult.java b/src/main/java/net/minecraft/server/SlotFurnaceResult.java
index d2698e847c..edc4a5c34e 100644
--- a/src/main/java/net/minecraft/server/SlotFurnaceResult.java
+++ b/src/main/java/net/minecraft/server/SlotFurnaceResult.java
@@ -2,7 +2,7 @@ package net.minecraft.server;
 
 public class SlotFurnaceResult extends Slot {
 
-    private final EntityHuman a;
+    private final EntityHuman a; public final EntityHuman getPlayer() { return this.a; } // Paper OBFHELPER
     private int b;
 
     public SlotFurnaceResult(EntityHuman entityhuman, IInventory iinventory, int i, int j, int k) {
diff --git a/src/main/java/net/minecraft/server/TileEntityFurnace.java b/src/main/java/net/minecraft/server/TileEntityFurnace.java
index adb1a09133..be16fe9a9e 100644
--- a/src/main/java/net/minecraft/server/TileEntityFurnace.java
+++ b/src/main/java/net/minecraft/server/TileEntityFurnace.java
@@ -554,7 +554,7 @@ public abstract class TileEntityFurnace extends TileEntityContainer implements I
         while (i > 0) {
             j = EntityExperienceOrb.getOrbValue(i);
             i -= j;
-            entityhuman.world.addEntity(new EntityExperienceOrb(entityhuman.world, entityhuman.locX, entityhuman.locY + 0.5D, entityhuman.locZ + 0.5D, j));
+            entityhuman.world.addEntity(new EntityExperienceOrb(entityhuman.world, entityhuman.locX, entityhuman.locY + 0.5D, entityhuman.locZ + 0.5D, j, org.bukkit.entity.ExperienceOrb.SpawnReason.FURNACE, entityhuman)); // Paper
         }
 
     }
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index c79b0f42a6..94178fe8ba 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -1626,7 +1626,7 @@ public class CraftWorld implements World {
         } else if (TNTPrimed.class.isAssignableFrom(clazz)) {
             entity = new EntityTNTPrimed(world, x, y, z, null);
         } else if (ExperienceOrb.class.isAssignableFrom(clazz)) {
-            entity = new EntityExperienceOrb(world, x, y, z, 0);
+            entity = new EntityExperienceOrb(world, x, y, z, 0, org.bukkit.entity.ExperienceOrb.SpawnReason.CUSTOM, null, null); // Paper
         } else if (LightningStrike.class.isAssignableFrom(clazz)) {
             entity = new EntityLightning(world, x, y, z, false);
         } else if (Firework.class.isAssignableFrom(clazz)) {
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftExperienceOrb.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftExperienceOrb.java
index 1b512cc45c..fbad045675 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftExperienceOrb.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftExperienceOrb.java
@@ -20,6 +20,18 @@ public class CraftExperienceOrb extends CraftEntity implements ExperienceOrb {
         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 EntityExperienceOrb getHandle() {
         return (EntityExperienceOrb) entity;
-- 
2.21.0