org.json4s.ext.EnumSerializer.scala Maven / Gradle / Ivy
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/*
* Copyright 2006-2010 WorldWide Conferencing, LLC
*
* 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 org.json4s
package ext
class EnumSerializer[E <: Enumeration: ClassManifest](enum: E)
extends Serializer[E#Value] {
import JsonDSL._
val EnumerationClass = classOf[E#Value]
private[this] def isValid(json: JValue) = json match {
case JInt(value) => value <= enum.maxId
case _ => false
}
def deserialize(implicit format: Formats):
PartialFunction[(TypeInfo, JValue), E#Value] = {
case (TypeInfo(EnumerationClass, _), json) if isValid(json) => json match {
case JInt(value) => enum(value.toInt)
case value => throw new MappingException("Can't convert " +
value + " to "+ EnumerationClass)
}
}
def serialize(implicit format: Formats): PartialFunction[Any, JValue] = {
case i: E#Value => i.id
}
}
class EnumNameSerializer[E <: Enumeration: ClassManifest](enum: E)
extends Serializer[E#Value] {
import JsonDSL._
val EnumerationClass = classOf[E#Value]
def deserialize(implicit format: Formats):
PartialFunction[(TypeInfo, JValue), E#Value] = {
case (t @ TypeInfo(EnumerationClass, _), json) if (isValid(json)) => {
json match {
case JString(value) => enum.withName(value)
case value => throw new MappingException("Can't convert " +
value + " to "+ EnumerationClass)
}
}
}
private[this] def isValid(json: JValue) = json match {
case JString(value) if (enum.values.exists(_.toString == value)) => true
case _ => false
}
def serialize(implicit format: Formats): PartialFunction[Any, JValue] = {
case i: E#Value => i.toString
}
}