Validate island data once owner is changed

Add TeamSetownerEvent that validates unlocked generatrs once owner is changed.

Author: BONNe

src/main/java/world/bentobox/magiccobblestonegenerator/listeners/JoinLeaveListener.java

@@ -16,6 +16,7 @@
 import world.bentobox.bentobox.api.events.island.IslandDeleteEvent;
 import world.bentobox.bentobox.api.events.island.IslandRegisteredEvent;
 import world.bentobox.bentobox.api.events.island.IslandResettedEvent;
+import world.bentobox.bentobox.api.events.team.TeamSetownerEvent;
 import world.bentobox.magiccobblestonegenerator.StoneGeneratorAddon;
 
 
@@ -82,6 +83,18 @@ public void onIslandCreated(IslandRegisteredEvent event)
     }
 
 
+    /**
+     * This method handles Team Owner Change event
+     *
+     * @param event Event that must be handled.
+     */
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void onTeamOwnerChange(TeamSetownerEvent event)
+    {
+        this.addon.getAddonManager().validateIslandData(event.getIsland());
+    }
+
+
     /**
      * This method handles island deletion. On island deletion it should remove generator data too.
      *
@@ -98,4 +111,4 @@ public void onIslandDelete(IslandDeleteEvent event)
      * stores addon instance
      */
     private final StoneGeneratorAddon addon;
-}
+}