DynamicConverter.scala

package util

import org.specs2.mutable.Specification
/**
 * Created by jero on 26-10-15.
 */
class FooTest extends Specification{

  trait Spec
  trait Data

  case class SpecA(id: String) extends Spec
  case class SpecB(id: String) extends Spec
  case class DataA(id: String) extends Data
  case class DataB(id: String) extends Data

  trait ConvertableTo[+D <: Data] { 
    def convert: PartialFunction[Spec, D]
  }

  class ConvertableToA extends ConvertableTo[DataA] {
    override def convert = { case SpecA(id) => DataA(id) }
  }

  class ConvertableToB extends ConvertableTo[DataB] {
    override def convert = { case SpecB(id) => DataB(id) }
  }

  implicit class ConvertableSpecList(specs: List[Spec]) {
    val converters = List(new ConvertableToA, new ConvertableToB) // TODO: dynamically load all available converters
    private val convert = converters.map(_.convert).reduceLeft(_ orElse _)
    def toDataList = specs.map(convert)
  }

  "Foo" should {
    "work" in {
      val specs = List(SpecA("a"), SpecB("b"))
      val result = specs.toDataList
      result should beEqualTo(List(DataA("a"), DataB("b")))
    }
  }
}