be.wegenenverkeer.atomium.play.jaxb.Adapters.scala Maven / Gradle / Ivy

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package be.wegenenverkeer.atomium.play.jaxb

import java.lang.{Double => JDouble, Integer => JInteger, Long => JLong}
import javax.xml.bind.annotation.adapters.XmlAdapter

object Adapters {

  /**
   * Taken from,
   * https://gist.github.com/krasserm/1891525#file-jaxb-02-scala
   */
  class OptionAdapter[A >: Null](nones: A*) extends XmlAdapter[A, Option[A]] {

    def marshal(v: Option[A]): A = {
      v.getOrElse(nones(0))
    }

    def unmarshal(v: A) = {
      if (nones contains v) None else Some(v)
    }
  }

  /**
   * NB The double type parameters ([S,A]) are necessary because MOXy always uses the first one as a target for casting
   * from the input string before passing to unmarshal. Unfortunately this means you need to always pass String as
   * the first type parameter when extending the CustomOptionAdapter (eg see DateTimeOptionAdapter).
   *
   * These bugs describe the behaviour and fix,
   * - https://bugs.eclipse.org/bugs/show_bug.cgi?id=440681
   * - https://bugs.eclipse.org/bugs/show_bug.cgi?id=431803
   * The fix should be available in the next release after 2.5.2
   */
  class CustomOptionAdapter[S, A](customAdapter: XmlAdapter[String, A], nones: String*) extends XmlAdapter[String, Option[A]] {

    def marshal(v: Option[A]): String = {
      v.map(customAdapter.marshal).getOrElse(nones(0))
    }

    def unmarshal(v: String): Option[A] = {
      if (nones contains v) None else Some(customAdapter.unmarshal(v))
    }
  }

  /**
   * Taken from,
   * https://gist.github.com/krasserm/1891525#file-jaxb-02-scala
   */
  class StringOptionAdapter extends OptionAdapter[String](null, "")

  class LongAdapter extends XmlAdapter[String, JLong] {

    override def unmarshal(v: String) = JLong.parseLong(v)

    override def marshal(v: JLong) = v.toString
  }

  class LongOptionAdapter extends CustomOptionAdapter[String, JLong](new LongAdapter, null)

  class DoubleAdapter extends XmlAdapter[String, JDouble] {

    override def unmarshal(v: String) = JDouble.parseDouble(v)

    override def marshal(v: JDouble) = v.toString
  }

  class IntAdapter extends XmlAdapter[String, JInteger] {

    override def unmarshal(v: String) = JInteger.parseInt(v)

    override def marshal(v: JInteger) = v.toString
  }

}