Optimization moved to method

src/engine/Enum.java

@@ -40,6 +40,11 @@ public class Enum {
 
         EnumSet<E> enumSet = EnumSet.noneOf(enumClass);
 
+        // Early exit if empty set
+
+        if (bitVector == 0)
+            return enumSet;
+
         for (E enumValue : enumClass.getEnumConstants()) {
             if ((bitVector & (1L << enumValue.ordinal())) != 0) {
                 enumSet.add(enumValue);

src/engine/objects/ItemTemplate.java

@@ -497,12 +497,10 @@ public class ItemTemplate {
 
                 int group_tactics_bitvector = ((Long) jsonObject.get("rune_group_tactics")).intValue();
 
-                if (group_tactics_bitvector != 0)
                 rune_group_tactics.addAll(Enum.fromLong(group_tactics_bitvector, Enum.MobBehaviourType.class));
 
                 int group_role_bitvector = ((Long) jsonObject.get("rune_group_role_set")).intValue();
 
-                if (group_role_bitvector != 0)
                 rune_group_role_set.addAll(Enum.fromLong(group_role_bitvector, Enum.MobBehaviourType.class));
 
                 JSONArray enemy_types_json = (JSONArray) jsonObject.get("rune_enemy_monster_types");