Added and tested LiftedFormatsSpec (thx to Dirk)

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
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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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