Created
September 8, 2013 09:20
-
-
Save xuwei-k/6483222 to your computer and use it in GitHub Desktop.
Json4s Scalaz7 example
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
libraryDependencies ++= Seq( | |
"org.json4s" %% "json4s-scalaz" % "3.2.5", | |
"org.json4s" %% "json4s-native" % "3.2.5" | |
) | |
scalaVersion := "2.10.2" |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/** | |
* https://github.com/json4s/json4s/issues/39 | |
* | |
* Validation Monad instance removed from Scalaz7. | |
* https://github.com/scalaz/scalaz/blob/v6.0.4/core/src/main/scala/scalaz/Validation.scala#L133-L147 | |
* | |
* need explicitly convert to `scalaz.\/` (aka disjunction) if you want use the `Kleisli` composition | |
*/ | |
object Main extends App { | |
import scalaz._ | |
import Scalaz._ | |
import org.json4s.scalaz.JsonScalaz._ | |
import org.json4s._ | |
import org.json4s.native.JsonMethods._ | |
case class Address(street: String, zipCode: String) | |
case class Person(name: String, age: Int, address: Address) | |
val json = parse(""" {"street": "Manhattan 2", "zip": "00223" } """) | |
val address1 = (field[String]("street")(json) |@| field[String]("zip")(json)) { Address } | |
println(address1) | |
val address2 = (field[String]("streets")(json) |@| field[String]("zip")(json)) { Address } | |
println(address2) | |
val address3 = Address.applyJSON(field[String]("street"), field[String]("zip"))(json) | |
println(address3) | |
implicit def addrJSONR: JSONR[Address] = Address.applyJSON(field[String]("street"), field[String]("zip")) | |
val p = parse(""" {"name":"joe","age":34,"address":{"street": "Manhattan 2", "zip": "00223" }} """) | |
val person1 = Person.applyJSON(field[String]("name"), field[Int]("age"), field[Address]("address"))(p) | |
println(person1) | |
def min(x: Int): Int => Result[Int] = (y: Int) => | |
if (y < x) Fail("min", y + " < " + x) else y.success | |
def max(x: Int): Int => Result[Int] = (y: Int) => | |
if (y > x) Fail("max", y + " > " + x) else y.success | |
type EitherNel[+a] = NonEmptyList[Error] \/ a | |
val ageValidator1 = Kleisli(field[Int]("age")).mapK[EitherNel, Int](_.disjunction) | |
val ageValidator2 = {i: Int => (min(18)(i) |@| max(60)(i))((a, _) => a).disjunction} | |
val ageValidator = ((ageValidator1 >==> ageValidator2).run _).andThen(_.validation) | |
val person2 = Person.applyJSON(field[String]("name"), ageValidator, field[Address]("address")) | |
println(person2(p)) | |
} | |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment