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-rw-r--r-- | src/main/scala/cc/spray/json/LiftedFormats.scala | 32 | ||||
-rw-r--r-- | src/test/scala/cc/spray/json/LiftedFormatsSpec.scala | 40 |
2 files changed, 72 insertions, 0 deletions
diff --git a/src/main/scala/cc/spray/json/LiftedFormats.scala b/src/main/scala/cc/spray/json/LiftedFormats.scala new file mode 100644 index 0000000..a7c32be --- /dev/null +++ b/src/main/scala/cc/spray/json/LiftedFormats.scala @@ -0,0 +1,32 @@ +/* + * Original implementation (C) 2009-2011 Debasish Ghosh + * Adapted and extended in 2011 by Mathias Doenitz + * + * 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 cc.spray.json + +trait LiftedFormats { + implicit def liftJsonWriter[T](implicit writer: JsonWriter[T]): JsonFormat[T] = new JsonFormat[T] { + def write(obj: T): JsValue = writer.write(obj) + def read(value: JsValue) = throw new UnsupportedOperationException("No reader available") + } + + implicit def liftJsonReader[T](implicit reader: JsonReader[T]): JsonFormat[T] = new JsonFormat[T] { + def write(obj: T): JsValue = throw new UnsupportedOperationException("No writer available") + def read(value: JsValue) = reader.read(value) + } +} + +object LiftedFormats extends LiftedFormats
\ No newline at end of file diff --git a/src/test/scala/cc/spray/json/LiftedFormatsSpec.scala b/src/test/scala/cc/spray/json/LiftedFormatsSpec.scala new file mode 100644 index 0000000..f98e2d5 --- /dev/null +++ b/src/test/scala/cc/spray/json/LiftedFormatsSpec.scala @@ -0,0 +1,40 @@ +package cc.spray.json + +import org.specs2.mutable._ +import cc.spray.json.DefaultJsonProtocol._ + +/** + * User: dirk + * Date: 31-08-11 + * Time: 10:01 + */ + +class LiftedFormatsSpec extends Specification { + + case class Container[A](obj: Option[A]) + + implicit def containerWriter[T](implicit writer: JsonWriter[T]) = new JsonWriter[Container[T]] { + import LiftedFormats.liftJsonWriter + def write(obj: Container[T]): JsValue = JsObject(JsField("content", obj.obj.toJson)) + } + + implicit def containerReader[T](implicit reader: JsonReader[T]) = new JsonReader[Container[T]] { + import LiftedFormats.liftJsonReader + def read(value: JsValue): Container[T] = { + value match { + case JsObject(JsField("content", obj: JsValue) :: Nil) => Container(Some(reader.read(obj))) + case _ => throw new DeserializationException("Unexpected format: " + value.toString) + } + } + } + + val obj = Container(Some(Container(Some(List(1, 2, 3))))) + + "The liftJsonWriter" should { + "convert a Container[Container[List[Int]]] to JsValue and back" in { + val r = obj.toJson + r.fromJson[Container[Container[List[Int]]]] + ok + } + } +}
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