com.twitter.server.util.Json.scala Maven / Gradle / Ivy

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package com.twitter.server.util

private[server] object Json {
  import com.fasterxml.jackson.core.`type`.TypeReference
  import com.fasterxml.jackson.databind.{ObjectMapper, JsonNode}
  import com.fasterxml.jackson.module.scala.DefaultScalaModule
  import java.lang.reflect.{Type, ParameterizedType}

  val mapper: ObjectMapper = new ObjectMapper().registerModule(DefaultScalaModule)

  def serialize(o: AnyRef): String = mapper.writeValueAsString(o)

  def deserialize[T: Manifest](value: String): T =
    mapper.readValue(value, typeReference[T])

  def deserialize[T: Manifest](node: JsonNode): T =
    mapper.readValue(node.traverse, typeReference[T])

  private def typeReference[T: Manifest] = new TypeReference[T] {
    override def getType = typeFromManifest(manifest[T])
  }

  private def typeFromManifest(m: Manifest[_]): Type =
    if (m.typeArguments.isEmpty) m.runtimeClass
    else new ParameterizedType {
      def getRawType = m.runtimeClass
      def getActualTypeArguments = m.typeArguments.map(typeFromManifest).toArray
      def getOwnerType = null
    }
}