リフレクションで動的にインスタンスを生成する何か

test.scala

import scala.reflect.runtime.{universe => ru}
import ru._

case class Hoge(id: Int, title: String)

class Fuga[T: TypeTag](orig: T) {
  val mirror = ru.runtimeMirror(Thread.currentThread.getContextClassLoader)
  val clazz = mirror.runtimeClass(typeOf[T])
  val fields = clazz.getDeclaredFields

  def dumpClass() {
    fields.map { field =>
      println(field.getName + ": " + field.getType.getName)
    }
  }

  def getType[U: TypeTag](obj: U) = typeOf[U]

  def makeInstance(): T = {
    val constructor = clazz.getConstructor(fields.map(_.getType): _*)
    val args: Array[AnyRef] = for (field <- fields) yield {
      field.setAccessible(true)
      field.get(orig)
      }
    }

    constructor.newInstance(args: _*).asInstanceOf[T]
  }
}

object Test {
  def main(args: Array[String]) {
    val s = new Fuga[Hoge](Hoge(1, "Ken"))
    s.dumpClass
    println(s.makeInstance)
  }
}