Added API to work out which game modes Level is active in.

src/main/java/world/bentobox/level/Level.java

@@ -2,6 +2,8 @@ package world.bentobox.level;
 
 import java.io.File;
 import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
 import java.util.UUID;
 
 import org.bukkit.Bukkit;
@@ -20,6 +22,7 @@ import world.bentobox.bentobox.api.configuration.Config;
 import world.bentobox.bentobox.api.events.BentoBoxReadyEvent;
 import world.bentobox.bentobox.api.user.User;
 import world.bentobox.bentobox.database.objects.Island;
+import world.bentobox.bentobox.util.Util;
 import world.bentobox.level.calculators.Pipeliner;
 import world.bentobox.level.commands.AdminLevelCommand;
 import world.bentobox.level.commands.AdminLevelStatusCommand;
@@ -53,6 +56,7 @@ public class Level extends Addon implements Listener {
     private LevelsManager manager;
     private boolean stackersEnabled;
     private boolean advChestEnabled;
+    private final List<GameModeAddon> registeredGameModes = new ArrayList<>();
 
     @Override
     public void onLoad() {
@@ -85,12 +89,14 @@ public class Level extends Addon implements Listener {
         this.registerListener(new JoinLeaveListener(this));
         this.registerListener(this);
         // Register commands for GameModes
+        registeredGameModes.clear();
         getPlugin().getAddonsManager().getGameModeAddons().stream()
         .filter(gm -> !settings.getGameModes().contains(gm.getDescription().getName()))
         .forEach(gm -> {
             log("Level hooking into " + gm.getDescription().getName());
             registerCommands(gm);
             registerPlaceholders(gm);
+            registeredGameModes.add(gm);
         });
         // Register request handlers
         registerRequestHandler(new LevelRequestHandler(this));
@@ -399,4 +405,30 @@ public class Level extends Addon implements Listener {
         });
         return ld;
     }
+
+    /**
+     * @return the registeredGameModes
+     */
+    public List<GameModeAddon> getRegisteredGameModes() {
+        return registeredGameModes;
+    }
+
+    /**
+     * Check if Level addon is active in game mode
+     * @param gm Game Mode Addon
+     * @return true if active, false if not
+     */
+    public boolean isRegisteredGameMode(GameModeAddon gm) {
+        return registeredGameModes.contains(gm);
+    }
+
+    /**
+     * Checks if Level addon is active in world
+     * @param world world
+     * @return true if active, false if not
+     */
+    public boolean isRegisteredGameModeWorld(World world) {
+        return registeredGameModes.stream().map(GameModeAddon::getOverWorld).anyMatch(w -> Util.sameWorld(world, w));
+    }
+
 }