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  1. object Main {
  2.   def main(args: Array[String]): Unit = {
  3.     println(connect())
  4.   }
  5.  
  6.   class IdInfo
  7.   class PasswordInfo
  8.   class ConnectionInfo
  9.  
  10.   class IOException extends RuntimeException
  11.   class AuthorizationException extends RuntimeException
  12.  
  13.   def calcIdInfo(): IdInfo = new IdInfo
  14.   def calcPwdInfo(id: IdInfo): PasswordInfo = new PasswordInfo
  15.   def calcConnInfo(id: IdInfo, pwd: PasswordInfo): ConnectionInfo = new ConnectionInfo
  16.   def verify(id:IdInfo, pwd: PasswordInfo, conn: ConnectionInfo): Unit = ()
  17.  
  18.   def connect(): Option[(IdInfo, PasswordInfo, ConnectionInfo)] = {
  19.     val idInfoOpt = try {
  20.       Some(calcIdInfo())
  21.     } catch {
  22.       case ex: IOException => None
  23.     }
  24.  
  25.     idInfoOpt map (idInfo => {
  26.       val pwdInfoOpt = try {
  27.         Some(calcPwdInfo(idInfo))
  28.       } catch {
  29.         case ex: AuthorizationException => None
  30.       }
  31.  
  32.       pwdInfoOpt map (pwdInfo => {
  33.         val connInfoOpt = try {
  34.           Some(calcConnInfo(idInfo, pwdInfo))
  35.         } catch {
  36.           case ex: IOException => None
  37.         }
  38.  
  39.         connInfoOpt map (connInfo => {
  40.           try {
  41.             verify(idInfo, pwdInfo, connInfo)
  42.             Some(idInfo, pwdInfo, connInfo)
  43.           } catch {
  44.             case ex: IOException => None
  45.             case ex: AuthorizationException => None
  46.           }
  47.         }) getOrElse None
  48.       }) getOrElse None
  49.     }) getOrElse None
  50.   }
  51. }
Success #stdin #stdout 0.34s 382016KB
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Standard input is empty
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Some((Main$IdInfo@222b9a,Main$PasswordInfo@15c8d94,Main$ConnectionInfo@1532075))
https://ideone.com/gulzgs
language:
Scala (scala 2.12.8)
created:
10 years ago
visibility:
public

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