com.fasterxml.jackson.module.scala.deser.ScalaObjectDeserializerModule.scala Maven / Gradle / Ivy

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package com.fasterxml.jackson.module.scala.deser

import com.fasterxml.jackson.core.JsonParser
import com.fasterxml.jackson.databind.deser.Deserializers
import com.fasterxml.jackson.databind.deser.std.StdDeserializer
import com.fasterxml.jackson.databind._
import com.fasterxml.jackson.module.scala.JacksonModule
import com.fasterxml.jackson.module.scala.util.ClassW

import scala.languageFeature.postfixOps

private class ScalaObjectDeserializer(clazz: Class[_]) extends StdDeserializer[Any](classOf[Any]) {
  override def deserialize(p: JsonParser, ctxt: DeserializationContext): Any = {
    clazz.getDeclaredFields.find(_.getName == "MODULE$").map(_.get(null)).getOrElse(null)
  }
}

private object ScalaObjectDeserializerResolver extends Deserializers.Base {
  override def findBeanDeserializer(javaType: JavaType, config: DeserializationConfig, beanDesc: BeanDescription): JsonDeserializer[_] = {
    val clazz = javaType.getRawClass
    if (ClassW(clazz).isScalaObject)
      new ScalaObjectDeserializer(clazz)
    else null
  }
}

trait ScalaObjectDeserializerModule extends JacksonModule {
  override def getModuleName: String = "ScalaObjectDeserializerModule"
  this += { _ addDeserializers ScalaObjectDeserializerResolver }
}

object ScalaObjectDeserializerModule extends ScalaObjectDeserializerModule