Add AdvancementsCreateEvent

src/main/java/net/roxeez/advancement/AdvancementManager.java

@@ -2,6 +2,7 @@
 
 import com.google.common.base.Preconditions;
 import com.google.common.collect.ImmutableList;
+import net.roxeez.advancement.event.AdvancementsCreateEvent;
 import net.roxeez.advancement.serialization.ObjectSerializer;
 import org.bukkit.Bukkit;
 import org.bukkit.NamespacedKey;
@@ -100,6 +101,7 @@ public void createAll(boolean clean) {
         }
 
         Bukkit.reloadData();
+        Bukkit.getServer().getPluginManager().callEvent(new AdvancementsCreateEvent());
     }
 
 }

src/main/java/net/roxeez/advancement/event/AdvancementsCreateEvent.java

@@ -0,0 +1,25 @@
+package net.roxeez.advancement.event;
+
+import org.bukkit.event.Event;
+import org.bukkit.event.HandlerList;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Called when the advancements are registered and Bukkit data is reloaded
+ */
+public class AdvancementsCreateEvent extends Event {
+
+    private static final HandlerList handlers = new HandlerList();
+
+    @Override
+    @NotNull
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    @NotNull
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+
+}