Add null-safety and helper methods to AbilityAPI (#5217)

Author: BitByLogics

src/main/java/com/gmail/nossr50/api/AbilityAPI.java

@@ -12,36 +12,40 @@ private AbilityAPI() {
     }
 
     public static boolean berserkEnabled(Player player) {
-        return UserManager.getPlayer(player).getAbilityMode(SuperAbilityType.BERSERK);
+        return hasAbilityEnabled(player, SuperAbilityType.BERSERK);
     }
 
     public static boolean gigaDrillBreakerEnabled(Player player) {
-        return UserManager.getPlayer(player).getAbilityMode(SuperAbilityType.GIGA_DRILL_BREAKER);
+        return hasAbilityEnabled(player, SuperAbilityType.GIGA_DRILL_BREAKER);
     }
 
     public static boolean greenTerraEnabled(Player player) {
-        return UserManager.getPlayer(player).getAbilityMode(SuperAbilityType.GREEN_TERRA);
+        return hasAbilityEnabled(player, SuperAbilityType.GREEN_TERRA);
     }
 
     public static boolean serratedStrikesEnabled(Player player) {
-        return UserManager.getPlayer(player).getAbilityMode(SuperAbilityType.SERRATED_STRIKES);
+        return hasAbilityEnabled(player, SuperAbilityType.SERRATED_STRIKES);
     }
 
     public static boolean skullSplitterEnabled(Player player) {
-        return UserManager.getPlayer(player).getAbilityMode(SuperAbilityType.SKULL_SPLITTER);
+        return hasAbilityEnabled(player, SuperAbilityType.SKULL_SPLITTER);
     }
 
     public static boolean superBreakerEnabled(Player player) {
-        return UserManager.getPlayer(player).getAbilityMode(SuperAbilityType.SUPER_BREAKER);
+        return hasAbilityEnabled(player, SuperAbilityType.SUPER_BREAKER);
     }
 
     public static boolean treeFellerEnabled(Player player) {
-        return UserManager.getPlayer(player).getAbilityMode(SuperAbilityType.TREE_FELLER);
+        return hasAbilityEnabled(player, SuperAbilityType.TREE_FELLER);
     }
 
     public static boolean isAnyAbilityEnabled(Player player) {
         final McMMOPlayer mmoPlayer = UserManager.getPlayer(player);
 
+        if(mmoPlayer == null) {
+            return false;
+        }
+
         for (SuperAbilityType ability : SuperAbilityType.values()) {
             if (mmoPlayer.getAbilityMode(ability)) {
                 return true;
@@ -51,36 +55,57 @@ public static boolean isAnyAbilityEnabled(Player player) {
         return false;
     }
 
+    private static boolean hasAbilityEnabled(Player player, SuperAbilityType ability) {
+        McMMOPlayer mmoPlayer = UserManager.getPlayer(player);
+        return mmoPlayer != null && mmoPlayer.getAbilityMode(ability);
+    }
+
     public static void resetCooldowns(Player player) {
-        UserManager.getPlayer(player).resetCooldowns();
+        McMMOPlayer mmoPlayer = UserManager.getPlayer(player);
+
+        if(mmoPlayer == null) {
+            return;
+        }
+
+        mmoPlayer.resetCooldowns();
     }
 
     public static void setBerserkCooldown(Player player, long cooldown) {
-        UserManager.getPlayer(player).setAbilityDATS(SuperAbilityType.BERSERK, cooldown);
+        setAbilityCooldown(player, SuperAbilityType.BERSERK, cooldown);
     }
 
     public static void setGigaDrillBreakerCooldown(Player player, long cooldown) {
-        UserManager.getPlayer(player).setAbilityDATS(SuperAbilityType.GIGA_DRILL_BREAKER, cooldown);
+        setAbilityCooldown(player, SuperAbilityType.GIGA_DRILL_BREAKER, cooldown);
     }
 
     public static void setGreenTerraCooldown(Player player, long cooldown) {
-        UserManager.getPlayer(player).setAbilityDATS(SuperAbilityType.GREEN_TERRA, cooldown);
+        setAbilityCooldown(player, SuperAbilityType.GREEN_TERRA, cooldown);
     }
 
     public static void setSerratedStrikesCooldown(Player player, long cooldown) {
-        UserManager.getPlayer(player).setAbilityDATS(SuperAbilityType.SERRATED_STRIKES, cooldown);
+        setAbilityCooldown(player, SuperAbilityType.SERRATED_STRIKES, cooldown);
     }
 
     public static void setSkullSplitterCooldown(Player player, long cooldown) {
-        UserManager.getPlayer(player).setAbilityDATS(SuperAbilityType.SKULL_SPLITTER, cooldown);
+        setAbilityCooldown(player, SuperAbilityType.SKULL_SPLITTER, cooldown);
     }
 
     public static void setSuperBreakerCooldown(Player player, long cooldown) {
-        UserManager.getPlayer(player).setAbilityDATS(SuperAbilityType.SUPER_BREAKER, cooldown);
+        setAbilityCooldown(player, SuperAbilityType.SUPER_BREAKER, cooldown);
     }
 
     public static void setTreeFellerCooldown(Player player, long cooldown) {
-        UserManager.getPlayer(player).setAbilityDATS(SuperAbilityType.TREE_FELLER, cooldown);
+        setAbilityCooldown(player, SuperAbilityType.TREE_FELLER, cooldown);
+    }
+
+    private static void setAbilityCooldown(Player player, SuperAbilityType ability, long cooldown) {
+        McMMOPlayer mmoPlayer = UserManager.getPlayer(player);
+
+        if(mmoPlayer == null) {
+            return;
+        }
+
+        mmoPlayer.setAbilityDATS(ability, cooldown);
     }
 
     public static boolean isBleeding(LivingEntity entity) {