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• validator_2.11
• 0.0.2
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• ValidationResult.scala

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validator.ValidationResult.scala Maven / Gradle / Ivy

package validator

sealed trait ValidationResult[A] {
  self =>

  def map[B](f: A => B): ValidationResult[B]

  def flatMap[B](f: A => ValidationResult[B]): ValidationResult[B]

  def orElse[B >: A](that: ValidationResult[B]): ValidationResult[B]

  def fold[B](f: Seq[ValidationResult.Error] => B, g: A => B): B
}

object ValidationResult {
  type Error = (ValidationName, Seq[ValidationError])
}

final case class ValidationSuccess[A](value: A) extends ValidationResult[A] {
  def map[B](f: A => B): ValidationResult[B] = ValidationSuccess(f(value))

  def flatMap[B](f: A => ValidationResult[B]): ValidationResult[B] = f(value)

  def orElse[B >: A](that: ValidationResult[B]): ValidationResult[B] = ValidationSuccess(value)

  def fold[B](f: Seq[ValidationResult.Error] => B, g: A => B): B = g(value)
}

final case class ValidationFailure[A](errors: Seq[ValidationResult.Error]) extends ValidationResult[A] {
  def map[B](f: A => B): ValidationResult[B] = ValidationFailure[B](errors)

  def flatMap[B](f: A => ValidationResult[B]): ValidationResult[B] = ValidationFailure[B](errors)

  def orElse[B >: A](that: ValidationResult[B]): ValidationResult[B] = that

  def fold[B](f: Seq[ValidationResult.Error] => B, g: A => B): B = f(errors)
}

object ValidationFailure {
  def of[A](errors: ValidationResult.Error*): ValidationFailure[A] = {
    ValidationFailure(errors)
  }
}