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jacks

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// Copyright (C) 2011 - Will Glozer.  All rights reserved.

package com.lambdaworks.jacks

import com.fasterxml.jackson.databind.JavaType
import com.fasterxml.jackson.databind.ObjectMapper
import com.fasterxml.jackson.databind.ObjectWriter

import scala.collection.convert.Wrappers.JConcurrentMapWrapper

import java.io._
import java.util.concurrent.ConcurrentHashMap

trait JacksMapper {
  val mapper = new ObjectMapper
  mapper.registerModule(new ScalaModule)

  def readValue[T: Manifest](src: Array[Byte]): T = mapper.readValue(src, resolve)
  def readValue[T: Manifest](src: InputStream): T = mapper.readValue(src, resolve)
  def readValue[T: Manifest](src: Reader): T      = mapper.readValue(src, resolve)
  def readValue[T: Manifest](src: String): T      = mapper.readValue(src, resolve)

  def writeValue(w: Writer, v: Any)         { mapper.writeValue(w, v) }
  def writeValue(o: OutputStream, v: Any)   { mapper.writeValue(o, v) }
  def writeValueAsString[T: Manifest](v: T) = writerWithType.writeValueAsString(v)

  def writerWithType[T: Manifest]: ObjectWriter = mapper.writerFor(resolve)

  val cache = JConcurrentMapWrapper(new ConcurrentHashMap[Manifest[_], JavaType])

  def resolve(implicit m: Manifest[_]): JavaType = cache.getOrElseUpdate(m, {
    def params = m.typeArguments.map(resolve(_))
    val tf = mapper.getTypeFactory
    m.typeArguments.isEmpty match {
      case true  => tf.constructType(m.erasure)
      case false => tf.constructParametrizedType(m.erasure, m.erasure, params: _*)
    }
  })
}

object JacksMapper extends JacksMapper