code: package ontology.effects.unary;
  
  import core.vgdl.VGDLSprite;
  import core.content.InteractionContent;
  import core.game.Game;
  import core.logging.Logger;
  import core.logging.Message;
  import ontology.Types;
  import ontology.effects.Effect;
  import tools.Direction;
  import tools.Utils;
  
  /**
   * Created with IntelliJ IDEA.
   * User: Diego
   * Date: 03/12/13
   * Time: 16:17
   * This is a Java port from Tom Schaul's VGDL - https://github.com/schaul/py-vgdl
   */
  public class FlipDirection extends Effect
  {
      public FlipDirection(InteractionContent cnt)
      {
          is_stochastic = true;
          this.parseParameters(cnt);
      }
  
      @Override
      public void execute(VGDLSprite sprite1, VGDLSprite sprite2, Game game)
      {
  	if(sprite1 == null){
  	    Logger.getInstance().addMessage(new Message(Message.WARNING, "1st sprite can't be EOS with FlipDirection interaction."));
  	    return;
  	}
  	
          sprite1.orientation = (Direction) Utils.choice(Types.DBASEDIRS, game.getRandomGenerator());
      }
  }
  