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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(fields) if fields.contains("content") => Container(Some(jsonReader[T].read(fields("content"))))
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("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]}}""").convertTo[Container[Container[List[Int]]]] mustEqual obj
}
}
case class Foo(id: Long, name: String, foos: Option[List[Foo]] = None)
object FooProtocol extends DefaultJsonProtocol {
implicit val FooProtocol: JsonFormat[Foo] = lazyFormat(jsonFormat(Foo, "id", "name", "foos"))
}
"The lazyFormat wrapper" should {
"enable recursive format definitions" in {
import FooProtocol._
Foo(1, "a", Some(Foo(2, "b", Some(Foo(3, "c") :: Nil)) :: Foo(4, "d") :: Nil)).toJson.toString mustEqual
"""{"id":1,"name":"a","foos":[{"id":2,"name":"b","foos":[{"id":3,"name":"c"}]},{"id":4,"name":"d"}]}"""
}
}
}
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