You can define patterns to match on non-case classes with "extractors".
See, e.g., http://www.scala-lang.org/node/112 or the "Extractors" chapter
from Programming in Scala.
--j
On Mon, Nov 10, 2008 at 8:49 PM, Erick Fleming <[EMAIL PROTECTED]>wrote:
> I've been trying to get my head wrapped around pattern matching and in
> particular trying to understand how the RequestState/Req type works in Lift.
>
> LiftRules.addDispatchBefore {
> case RequestState("login" :: Nil, "", PostRequest) => LoginOps.login
> case RequestState("logout" :: Nil, "", _) => LoginOps.logout
> case RequestState("/" :: page, "", _)
> if User.isNotAuthenticated =>
> RequestedURL(Full(S.uri))
> () => Full(RedirectResponse("/login"))
> }
> }
>
> The previous code works and seems straight forward to me, but looking at
> Lift's code confuses me. RequestState/Req class has more than three
> arguments in the constructor, how can you pattern match on only three
> arguments and I also thought that the class needed to be a case class.
>
> Sorry for the basic question.
>
> >
>
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