1 package controllers

     2 

     3 import play.api._

     4 import play.api.mvc._

     5 import play.api.data._

     6 import play.api.data.Forms._

     7 

     8 /*

     9  * Application sets a cookie in plain ASCII on the

    10  * clients browser recording the visits of a page.

    11  */

    12 

    13 object Application extends Controller {

    14 

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

    16   def gt_cookie(c: Option[Cookie]) : Int = c.map(_.value) match {

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

    18     case _ => 0

    19   }

    20 

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

    22     Cookie("visits", i.toString)

    23   }

    24   

    25   // GET request: read cookie data first

    26   def index = Action { request =>

    27  

    28     //reads the cookie and extracts the visits counter   

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

    30     val visits = gt_cookie(visits_cookie)

    31 

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

    33     val msg1 = "You are a valued customer who has visited this site %d times."               

    34     val msg2 = "You have visited this site %d times."

    35     val msg = 

    36       if (visits >= 10) msg1.format(visits) else msg2.format(visits)

    37     

    38     //send message with new cookie

    39     Ok(msg).as(HTML).withCookies(mk_cookie(visits + 1))

    40   }

    41 }

    42 

    43 

    44 

    45