public class Spider extends Animal {

    // spider algo
    public Position move(Board board, Direction direction, Animal ... animals)
    {
        // get the current position
        Position position = getPositionOnBoard();

        while (true)
        {
            // get a ref sur our target position
            Position targetPosition = position.next(direction);
            Square square = null;

           // try getting the square at that position
            try
            {
                square = board.getSquareAtPosition(targetPosition);
            }
            catch (IllegalArgumentException ex)
            {
                return null;
            }
            // oob, we are out of the board
            catch (ArrayIndexOutOfBoundsException ex)
            {
                return null;
            }

            // square is null (= vide), we die
            if (square == null)
            {
                setPositionOnBoard(null);

                return null;
            }
            // square is star, we die and replace the star by a grass
            else if (square.getType() == SquareType.STAR)
            {
                setPositionOnBoard(targetPosition);
                square.setType(SquareType.GRASS);
                setOnStar();
                setPositionOnBoard(null);

                return targetPosition;
            }
            // check if the square is occupied by another animal
            else
            {
                for(Animal animal : animals)
                {
                    // if so, stay where we are
                    if(animal.getPositionOnBoard().equals(targetPosition))
                    {
                        return position;
                    }
                }

                // update our pos to the target position and we loop again
                position = targetPosition;
                setPositionOnBoard(position);
            }
        }
    }

    public Spider(Position position) {
        super(position);

    }
}