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package cc.spray.json
import org.specs2.mutable._
class AdditionalFormatsSpec extends Specification {
case class Container[A](inner: Option[A])
object ReaderProtocol extends DefaultJsonProtocol {
implicit def containerReader[T :JsonFormat] = lift {
new JsonReader[Container[T]] {
def read(value: JsValue) = value match {
case JsObject(JsField("content", obj: JsValue) :: Nil) => Container(Some(jsonReader[T].read(obj)))
case _ => throw new DeserializationException("Unexpected format: " + value.toString)
}
}
}
}
object WriterProtocol extends DefaultJsonProtocol {
implicit def containerWriter[T :JsonFormat] = lift {
new JsonWriter[Container[T]] {
def write(obj: Container[T]) = JsObject(JsField("content", obj.inner.toJson))
}
}
}
"The liftJsonWriter" should {
val obj = Container(Some(Container(Some(List(1, 2, 3)))))
"properly write a Container[Container[List[Int]]] to JSON" in {
import WriterProtocol._
obj.toJson.toString mustEqual """{"content":{"content":[1,2,3]}}"""
}
"properly read a Container[Container[List[Int]]] from JSON" in {
import ReaderProtocol._
JsonParser("""{"content":{"content":[1,2,3]}}""").fromJson[Container[Container[List[Int]]]] mustEqual obj
}
}
}
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