public class ClassExemple implements Listener {

    @EventHandler
    public void onRegister (SpawnerRegisterEvent event ) {
        event. setFactionListener ( new LegacyFaction ( ) ) ;
    }

 
  public class LegacyFaction extends FactionListener {
 
    @Override
    public boolean canBuild (Player player, Location location ) {
        @SuppressWarnings ( "deprecation" )
        String tag = Board. get ( ). getFactionAt ( new FLocation (location ) ). getTag ( ) ;
        String playerTag = FPlayerColl. get (player ). getFaction ( ). getTag ( ) ;
        return tag. equals (playerTag ) ;
    }

  }
}