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author | Jakob Odersky <jakob@odersky.com> | 2018-03-07 14:07:25 -0800 |
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committer | Jakob Odersky <jakob@odersky.com> | 2019-04-03 20:08:15 -0400 |
commit | f5cbf3b48d1f94a5007d815cc42d5f3e94b625ec (patch) | |
tree | 46921ce46d8459040cc06cbedc8f47abfbd58c4b /shared/src/main/scala/spray/json/CollectionFormats.scala | |
parent | 0b893f26ed2fd71649389e7eccc7bba6f1507946 (diff) | |
download | spray-json-f5cbf3b48d1f94a5007d815cc42d5f3e94b625ec.tar.gz spray-json-f5cbf3b48d1f94a5007d815cc42d5f3e94b625ec.tar.bz2 spray-json-f5cbf3b48d1f94a5007d815cc42d5f3e94b625ec.zip |
Add support for ScalaJS and Scala Native
Binary compatibility with previous versions is maintained.
Diffstat (limited to 'shared/src/main/scala/spray/json/CollectionFormats.scala')
-rw-r--r-- | shared/src/main/scala/spray/json/CollectionFormats.scala | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/shared/src/main/scala/spray/json/CollectionFormats.scala b/shared/src/main/scala/spray/json/CollectionFormats.scala new file mode 100644 index 0000000..ef94297 --- /dev/null +++ b/shared/src/main/scala/spray/json/CollectionFormats.scala @@ -0,0 +1,95 @@ +/* + * 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.reflect.ClassTag + +trait CollectionFormats { + + /** + * Supplies the JsonFormat for Lists. + */ + implicit def listFormat[T :JsonFormat] = new RootJsonFormat[List[T]] { + def write(list: List[T]) = JsArray(list.map(_.toJson).toVector) + def read(value: JsValue): List[T] = value match { + case JsArray(elements) => elements.toIterator.map(_.convertTo[T]).toList + case x => deserializationError("Expected List as JsArray, but got " + x) + } + } + + /** + * Supplies the JsonFormat for Arrays. + */ + implicit def arrayFormat[T :JsonFormat :ClassTag] = new RootJsonFormat[Array[T]] { + def write(array: Array[T]) = JsArray(array.map(_.toJson).toVector) + def read(value: JsValue) = value match { + case JsArray(elements) => elements.map(_.convertTo[T]).toArray[T] + case x => deserializationError("Expected Array as JsArray, but got " + x) + } + } + + /** + * Supplies the JsonFormat for Maps. The implicitly available JsonFormat for the key type K must + * always write JsStrings, otherwise a [[spray.json.SerializationException]] will be thrown. + */ + implicit def mapFormat[K :JsonFormat, V :JsonFormat] = new RootJsonFormat[Map[K, V]] { + def write(m: Map[K, V]) = JsObject { + m.map { field => + field._1.toJson match { + case JsString(x) => x -> field._2.toJson + case x => throw new SerializationException("Map key must be formatted as JsString, not '" + x + "'") + } + } + } + def read(value: JsValue) = value match { + case x: JsObject => x.fields.map { field => + (JsString(field._1).convertTo[K], field._2.convertTo[V]) + } + case x => deserializationError("Expected Map as JsObject, but got " + x) + } + } + + import collection.{immutable => imm} + + implicit def immIterableFormat[T :JsonFormat] = viaSeq[imm.Iterable[T], T](seq => imm.Iterable(seq :_*)) + implicit def immSeqFormat[T :JsonFormat] = viaSeq[imm.Seq[T], T](seq => imm.Seq(seq :_*)) + implicit def immIndexedSeqFormat[T :JsonFormat] = viaSeq[imm.IndexedSeq[T], T](seq => imm.IndexedSeq(seq :_*)) + implicit def immLinearSeqFormat[T :JsonFormat] = viaSeq[imm.LinearSeq[T], T](seq => imm.LinearSeq(seq :_*)) + implicit def immSetFormat[T :JsonFormat] = viaSeq[imm.Set[T], T](seq => imm.Set(seq :_*)) + implicit def vectorFormat[T :JsonFormat] = viaSeq[Vector[T], T](seq => Vector(seq :_*)) + + import collection._ + + implicit def iterableFormat[T :JsonFormat] = viaSeq[Iterable[T], T](seq => Iterable(seq :_*)) + implicit def seqFormat[T :JsonFormat] = viaSeq[Seq[T], T](seq => Seq(seq :_*)) + implicit def indexedSeqFormat[T :JsonFormat] = viaSeq[IndexedSeq[T], T](seq => IndexedSeq(seq :_*)) + implicit def linearSeqFormat[T :JsonFormat] = viaSeq[LinearSeq[T], T](seq => LinearSeq(seq :_*)) + implicit def setFormat[T :JsonFormat] = viaSeq[Set[T], T](seq => Set(seq :_*)) + + /** + * A JsonFormat construction helper that creates a JsonFormat for an Iterable type I from a builder function + * List => I. + */ + def viaSeq[I <: Iterable[T], T :JsonFormat](f: imm.Seq[T] => I): RootJsonFormat[I] = new RootJsonFormat[I] { + def write(iterable: I) = JsArray(iterable.map(_.toJson).toVector) + def read(value: JsValue) = value match { + case JsArray(elements) => f(elements.map(_.convertTo[T])) + case x => deserializationError("Expected Collection as JsArray, but got " + x) + } + } +} |