1 files changed, 69 insertions, 0 deletions
diff --git a/src/main/scala/cc/spray/json/formats/CollectionFormats.scala b/src/main/scala/cc/spray/json/formats/CollectionFormats.scala
new file mode 100644
index 0000000..53be0d5
--- /dev/null
+++ b/src/main/scala/cc/spray/json/formats/CollectionFormats.scala
@@ -0,0 +1,69 @@
+package cc.spray.json
+package formats
+
+/*
+ * 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.
+ */
+
+import reflect.Manifest
+
+trait CollectionFormats {
+  
+  implicit def listFormat[T :JsonFormat] = new JsonFormat[List[T]] {
+    def write(list: List[T]) = JsArray(list.map(_.toJson))
+    def read(value: JsValue) = value match {
+      case JsArray(elements) => elements.map(_.fromJson)
+      case _ => throw new DeserializationException("List expected")
+    }
+  }
+  
+  implicit def arrayFormat[T :JsonFormat :Manifest] = new JsonFormat[Array[T]] {
+    def write(array: Array[T]) = JsArray(array.map(_.toJson).toList)
+    def read(value: JsValue) = value match {
+      case JsArray(elements) => elements.map(_.fromJson[T]).toArray
+      case _ => throw new DeserializationException("Array expected")
+    }
+  }
+  
+  implicit def mapFormat[K :JsonFormat, V :JsonFormat] = new JsonFormat[Map[K, V]] {
+    def write(m: Map[K, V]) = JsObject {
+      m.toList.map { t =>
+        t._1.toJson match {
+          case JsString(x) => JsField(x, t._2.toJson)
+          case x => throw new SerializationException("Map key must be formatted as JsString, not '" + x + "'")
+        }
+      }
+    }
+    def read(value: JsValue) = value match {
+      case JsObject(fields) => fields.map(field => (JsString(field.name).fromJson[K], field.value.fromJson[V])).toMap
+      case _ => throw new DeserializationException("Map expected")
+    }
+  }
+
+  implicit def immutableSetFormat[T :JsonFormat] = viaList[Set[T], T](list => Set(list :_*))
+  
+  import collection.mutable.Set
+  implicit def mutableSetFormat[T :JsonFormat] = viaList[Set[T], T](list => Set.empty ++ list)
+
+  def viaList[I <: Iterable[T], T :JsonFormat](f: List[T] => I): JsonFormat[I] = new JsonFormat[I] {
+    def write(iterable: I) = JsArray(iterable.map(_.toJson).toList)
+    def read(value: JsValue) = value match {
+      case JsArray(elements) => f(elements.map(_.fromJson[T]))
+      case _ => throw new DeserializationException("Collection expected")
+    }
+  }
+  
+}
+\ No newline at end of file