gistfile1.scala

package com.github.j5ik2o.scalaz

import scalaz._
import Scalaz._

class Request(map: Map[String, Any]) {

  def apply(name: String): Any = map(name)

}

case class PersonForm(name: String, age: Int)

object PersonForm {

  private def validateName(name: String): ValidationNel[Throwable, String] =
    if (name.size > 0)
      name.successNel
    else
      new Exception("name is empty").failureNel

  private def validateAge(age: Int): ValidationNel[Throwable, Int] =
    if (age > 20)
      age.successNel
    else
      new Exception("age is invalid").failureNel

  private def validate(name: String, age: Int): ValidationNel[Throwable, PersonForm] =
    (validateName(name) |@| validateAge(age))(PersonForm.apply _)


  def validate(request: Request): ValidationNel[Throwable, PersonForm] = {
    validate(
      request("name").asInstanceOf[String],
      request("age").asInstanceOf[Int]
    )
  }

}

object Main extends App {

  val personForm1 = PersonForm.validate(new Request(Map("name" -> "kato", "age" -> 21)))
  personForm1 match {
    case Success(personForm) => println(personForm)
    case Failure(ex) => ex.foreach(println)
  }

  val personForm2 = PersonForm.validate(new Request(Map("name" -> "", "age" -> 0)))
  personForm2 match {
    case Success(personForm) => println(personForm)
    case Failure(ex) => ex.foreach(println)
  }
}