From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: BillyGalbreath <Blake.Galbreath@GMail.com>
Date: Fri, 19 Jan 2018 08:15:29 -0600
Subject: [PATCH] Add PlayerAdvancementCriterionGrantEvent


diff --git a/src/main/java/net/minecraft/server/PlayerAdvancements.java b/src/main/java/net/minecraft/server/PlayerAdvancements.java
index f5f26c0327f0dae47badcc914fc89a4019c784a3..6487bf016e646ca772b667a2a81c85e82c027c05 100644
--- a/src/main/java/net/minecraft/server/PlayerAdvancements.java
+++ b/src/main/java/net/minecraft/server/PlayerAdvancements.java
@@ -226,6 +226,12 @@ public class PlayerAdvancements {
         boolean flag1 = advancementprogress.isDone();
 
         if (advancementprogress.grantProgress(criterionName)) {
+            // Paper start
+            if (!new com.destroystokyo.paper.event.player.PlayerAdvancementCriterionGrantEvent(this.player.getBukkitEntity(), advancement.toBukkit(), criterionName).callEvent()) {
+                advancementprogress.revokeProgress(criterionName);
+                return false;
+            }
+            // Paper end
             this.unregisterListeners(advancement);
             this.progressChanged.add(advancement);
             flag = true;