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Singleton pattern with getInstance

package {   public class Singleton {     private static var instance:Singleton;     private static var allowInstance:Boolean;     public function Singleton() {       if(!allowInstance) {          throw new Error("Error: use Singleton.getInstance() instead of new keyword");       }     }     public static function getInstance():Singleton {        if(instance == null) {          allowInstance = true;          instance = new Singleton();          trace("Singleton instance created");          allowInstance = false;        } else {           trace("Singleton instance already exists");        }        return instance;     }     public function doSomething():void {       trace("doing something");     }   } }