cron4s.validation.package.scala Maven / Gradle / Ivy

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CRON expression parser for Scala

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/*
 * Copyright 2017 Antonio Alonso Dominguez
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package cron4s

import cats.data.NonEmptyList

import cron4s.expr.CronExpr

/**
  * Created by alonsodomin on 30/08/2016.
  */
package object validation {

  def validateCron(expr: CronExpr): Either[InvalidCron, CronExpr] = {
    val dayFieldError = validateDayFields(expr)
    val fieldErrors = expr.raw.map(ops.validate).toList.flatten

    val allErrors = dayFieldError.fold[List[ValidationError]](fieldErrors)(_ :: fieldErrors)

    NonEmptyList.fromList(allErrors)
      .map(errs => Left(InvalidCron(errs)))
      .getOrElse(Right(expr))
  }

  private def validateDayFields(expr: CronExpr) = {
    val dayOfMonth = expr.field[CronField.DayOfMonth].toString
    val dayOfWeek  = expr.field[CronField.DayOfWeek].toString

    if (dayOfMonth == dayOfWeek) {
      Some(InvalidFieldCombination(
        s"Fields ${CronField.DayOfMonth} and ${CronField.DayOfWeek} can't both have the expression: $dayOfMonth"
      ))
    } else if ((dayOfMonth != "?" && dayOfWeek == "?") || (dayOfMonth == "?" && dayOfWeek != "?")) {
      None
    } else Some(InvalidFieldCombination(
      s"Either ${CronField.DayOfMonth} and ${CronField.DayOfWeek} must have a ? expression"
    ))
  }

}