ai.deepsense.commons.json.EnumerationSerializer.scala Maven / Gradle / Ivy
/**
* Copyright 2015 deepsense.ai (CodiLime, Inc)
*
* 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 ai.deepsense.commons.json
import spray.json._
/**
* Utility that produces JsonFormat for enumeration.
*/
object EnumerationSerializer {
def jsonEnumFormat[T <: Enumeration](enumeration: T): JsonFormat[T#Value] = {
new JsonFormat[T#Value] {
def write(obj: T#Value) = JsString(obj.toString)
def read(json: JsValue) = json match {
case JsString(txt) => enumeration.withName(txt)
case x => throw new DeserializationException(
s"Expected a value from enum $enumeration instead of $x")
}
}
}
}