1 package controllers

     2 

     3 import play.api.mvc._

     4 

     5 /*

     6  * Application sets a cookie in plain ASCII on the

     7  * client's browser recording the number of visits

     8  * of a page.

     9  */

    10 

    11 object Application extends Controller {

    12 

    13   //no or invalid cookie results in the counter being 0

    14   def gt_cookie(c: Cookie) : Int = c.value match {

    15     case s if (s.forall(_.isDigit)) => s.toInt 

    16     case _ => 0

    17   }

    18 

    19   def mk_cookie(i: Int) : Cookie = {

    20     Cookie("visits", i.toString)

    21   }

    22   

    23   // GET request: read cookie data first

    24   def index = Action { request =>

    25  

    26     //reads the cookie and extracts the visits counter   

    27     val visits_cookie = request.cookies.get("visits")

    28     val visits = visits_cookie.map(gt_cookie).getOrElse(0)

    29 

    30     //printing a message according to value of visits counter

    31     val msg = 

    32       if (visits >= 10)

    33         s"You are a valued customer who has visited this site $visits times."               

    34       else s"You have visited this site $visits times."

    35     

    36     //send message with new cookie

    37     Ok(msg).withCookies(mk_cookie(visits + 1))

    38   }

    39 }

    40 

    41 

    42 

    43