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Diffstat (limited to 'src/main/scala/spray/json/StandardFormats.scala')
-rw-r--r-- | src/main/scala/spray/json/StandardFormats.scala | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/src/main/scala/spray/json/StandardFormats.scala b/src/main/scala/spray/json/StandardFormats.scala new file mode 100644 index 0000000..6a9712a --- /dev/null +++ b/src/main/scala/spray/json/StandardFormats.scala @@ -0,0 +1,118 @@ +/* + * 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 spray.json + +import scala.{Left, Right} + +/** + * Provides the JsonFormats for the non-collection standard types. + */ +trait StandardFormats { + this: AdditionalFormats => + + private[json] type JF[T] = JsonFormat[T] // simple alias for reduced verbosity + + implicit def optionFormat[T :JF] = new OptionFormat[T] + + class OptionFormat[T :JF] extends JF[Option[T]] { + def write(option: Option[T]) = option match { + case Some(x) => x.toJson + case None => JsNull + } + def read(value: JsValue) = value match { + case JsNull => None + case x => Some(x.convertTo[T]) + } + } + + implicit def eitherFormat[A :JF, B :JF] = new JF[Either[A, B]] { + def write(either: Either[A, B]) = either match { + case Right(a) => a.toJson + case Left(b) => b.toJson + } + def read(value: JsValue) = (value.convertTo(safeReader[A]), value.convertTo(safeReader[B])) match { + case (Right(a), _: Left[_, _]) => Left(a) + case (_: Left[_, _], Right(b)) => Right(b) + case (_: Right[_, _], _: Right[_, _]) => deserializationError("Ambiguous Either value: can be read as both, Left and Right, values") + case (Left(ea), Left(eb)) => deserializationError("Could not read Either value:\n" + ea + "---------- and ----------\n" + eb) + } + } + + implicit def tuple1Format[A :JF] = new JF[Tuple1[A]] { + def write(t: Tuple1[A]) = t._1.toJson + def read(value: JsValue) = Tuple1(value.convertTo[A]) + } + + implicit def tuple2Format[A :JF, B :JF] = new RootJsonFormat[(A, B)] { + def write(t: (A, B)) = JsArray(t._1.toJson, t._2.toJson) + def read(value: JsValue) = value match { + case JsArray(a :: b :: Nil) => (a.convertTo[A], b.convertTo[B]) + case x => deserializationError("Expected Tuple2 as JsArray, but got " + x) + } + } + + implicit def tuple3Format[A :JF, B :JF, C :JF] = new RootJsonFormat[(A, B, C)] { + def write(t: (A, B, C)) = JsArray(t._1.toJson, t._2.toJson, t._3.toJson) + def read(value: JsValue) = value match { + case JsArray(a :: b :: c :: Nil) => (a.convertTo[A], b.convertTo[B], c.convertTo[C]) + case x => deserializationError("Expected Tuple3 as JsArray, but got " + x) + } + } + + implicit def tuple4Format[A :JF, B :JF, C :JF, D :JF] = new RootJsonFormat[(A, B, C, D)] { + def write(t: (A, B, C, D)) = JsArray(t._1.toJson, t._2.toJson, t._3.toJson, t._4.toJson) + def read(value: JsValue) = value match { + case JsArray(a :: b :: c :: d :: Nil) => (a.convertTo[A], b.convertTo[B], c.convertTo[C], d.convertTo[D]) + case x => deserializationError("Expected Tuple4 as JsArray, but got " + x) + } + } + + implicit def tuple5Format[A :JF, B :JF, C :JF, D :JF, E :JF] = { + new RootJsonFormat[(A, B, C, D, E)] { + def write(t: (A, B, C, D, E)) = JsArray(t._1.toJson, t._2.toJson, t._3.toJson, t._4.toJson, t._5.toJson) + def read(value: JsValue) = value match { + case JsArray(a :: b :: c :: d :: e :: Nil) => + (a.convertTo[A], b.convertTo[B], c.convertTo[C], d.convertTo[D], e.convertTo[E]) + case x => deserializationError("Expected Tuple5 as JsArray, but got " + x) + } + } + } + + implicit def tuple6Format[A :JF, B :JF, C :JF, D :JF, E :JF, F: JF] = { + new RootJsonFormat[(A, B, C, D, E, F)] { + def write(t: (A, B, C, D, E, F)) = JsArray(t._1.toJson, t._2.toJson, t._3.toJson, t._4.toJson, t._5.toJson, t._6.toJson) + def read(value: JsValue) = value match { + case JsArray(a :: b :: c :: d :: e :: f :: Nil) => + (a.convertTo[A], b.convertTo[B], c.convertTo[C], d.convertTo[D], e.convertTo[E], f.convertTo[F]) + case x => deserializationError("Expected Tuple6 as JsArray, but got " + x) + } + } + } + + implicit def tuple7Format[A :JF, B :JF, C :JF, D :JF, E :JF, F: JF, G: JF] = { + new RootJsonFormat[(A, B, C, D, E, F, G)] { + def write(t: (A, B, C, D, E, F, G)) = JsArray(t._1.toJson, t._2.toJson, t._3.toJson, t._4.toJson, t._5.toJson, t._6.toJson, t._6.toJson) + def read(value: JsValue) = value match { + case JsArray(a :: b :: c :: d :: e :: f :: g :: Nil) => + (a.convertTo[A], b.convertTo[B], c.convertTo[C], d.convertTo[D], e.convertTo[E], f.convertTo[F], g.convertTo[G]) + case x => deserializationError("Expected Tuple7 as JsArray, but got " + x) + } + } + } + +}
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