Bending JAXB to the will of Scala [1/2]

jaxb-in-scala-1_01.scala

case class EntryType(entrytypeoption: Seq[scalaxb.DataRecord[Any]] = Nil,
  attributes: Map[String, scalaxb.DataRecord[Any]]) extends FeedTypeOption

case class EntryType(entrytypeoption: Seq[scalaxb.DataRecord[Any]] = Nil,
  xmlbase: Option[java.net.URI] = None,
  xmllang: Option[String] = None,
  attributes: Map[String, scalaxb.DataRecord[Any]]) extends FeedTypeOption

jaxb-in-scala-1_02.txt

java.lang.NullPointerException
	at com.sun.xml.internal.bind.v2.runtime.output.Encoded.setEscape(Encoded.java:96)
	at com.sun.xml.internal.bind.v2.runtime.output.UTF8XmlOutput.doText(UTF8XmlOutput.java:306)
	at com.sun.xml.internal.bind.v2.runtime.output.UTF8XmlOutput.text(UTF8XmlOutput.java:290)
	at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.leafElement(XMLSerializer.java:314)
	at com.sun.xml.internal.bind.v2.model.impl.RuntimeBuiltinLeafInfoImpl$StringImplImpl.writeLeafElement(RuntimeBuiltinLeafInfoImpl.java:1037)
	at com.sun.xml.internal.bind.v2.model.impl.RuntimeBuiltinLeafInfoImpl$StringImplImpl.writeLeafElement(RuntimeBuiltinLeafInfoImpl.java:1016)
	at com.sun.xml.internal.bind.v2.runtime.reflect.TransducedAccessor$CompositeTransducedAccessorImpl.writeLeafElement(TransducedAccessor.java:241)
	at com.sun.xml.internal.bind.v2.runtime.property.SingleElementLeafProperty.serializeBody(SingleElementLeafProperty.java:114)
	at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:343)
	at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.childAsSoleContent(XMLSerializer.java:582)
	at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.serializeRoot(ClassBeanInfoImpl.java:325)
	at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.childAsRoot(XMLSerializer.java:483)
	at com.sun.xml.internal.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:308)
	at com.sun.xml.internal.bind.v2.runtime.MarshallerImpl.marshal(MarshallerImpl.java:236)
	at javax.xml.bind.helpers.AbstractMarshallerImpl.marshal(AbstractMarshallerImpl.java:95)

jaxb-in-scala-1_03.scala

import scala.annotation.target.field
 
import javax.xml.bind.annotation._
import javax.xml.bind.annotation.adapters._
 
type xmlElement     = XmlElement @field
type xmlTypeAdapter = XmlJavaTypeAdapter @field

class OptionAdapter[A](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)
}

object Email {
  class EmailOptionAdapter extends OptionAdapter[Email](null, Email(""))
}

@XmlAccessorType(XmlAccessType.FIELD)
case class Email(@xmlValue email:String) {
  override def toString = email

  private def this() = this("")
}

@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
case class Person(name:String,
                  @xmlTypeAdapter(classOf[Email.EmailOptionAdapter]) email:Option[Email] = None) {

  private def this() = this("", None)
}

jaxb-in-scala-1_04.txt

java.lang.NullPointerException
	at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:54)
	at sun.reflect.UnsafeQualifiedObjectFieldAccessorImpl.get(UnsafeQualifiedObjectFieldAccessorImpl.java:38)
	at java.lang.reflect.Field.get(Field.java:379)
	at com.sun.xml.bind.v2.runtime.reflect.Accessor$FieldReflection.get(Accessor.java:266)
	at com.sun.xml.bind.v2.runtime.reflect.Accessor.getUnadapted(Accessor.java:143)
	at com.sun.xml.bind.v2.runtime.reflect.TransducedAccessor$CompositeTransducedAccessorImpl.hasValue(TransducedAccessor.java:251)
	at com.sun.xml.bind.v2.model.impl.RuntimeClassInfoImpl$TransducerImpl.writeLeafElement(RuntimeClassInfoImpl.java:409)
	at com.sun.xml.bind.v2.runtime.reflect.TransducedAccessor$CompositeTransducedAccessorImpl.writeLeafElement(TransducedAccessor.java:256)
	at com.sun.xml.bind.v2.runtime.property.SingleElementLeafProperty.serializeBody(SingleElementLeafProperty.java:130)
	at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:361)
	at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsSoleContent(XMLSerializer.java:593)
	at com.sun.xml.bind.v2.runtime.ClassBeanInfoImpl.serializeRoot(ClassBeanInfoImpl.java:342)
	at com.sun.xml.bind.v2.runtime.XMLSerializer.childAsRoot(XMLSerializer.java:494)
	at com.sun.xml.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:323)
	at com.sun.xml.bind.v2.runtime.MarshallerImpl.marshal(MarshallerImpl.java:251)
	at javax.xml.bind.helpers.AbstractMarshallerImpl.marshal(AbstractMarshallerImpl.java:95)

jaxb-in-scala-1_05.scala

import scala.annotation.target.field
 
import javax.xml.bind.annotation._
import javax.xml.bind.annotation.adapters._

import org.joda.time.DateTime
import org.joda.time.format.DateTimeFormatter
 
type xmlElement     = XmlElement @field
type xmlTypeAdapter = XmlJavaTypeAdapter @field

/**
* 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))
  }
}

class DateTimeAdapter(dtf: DateTimeFormatter) extends XmlAdapter[String, DateTime] {
  def unmarshal(v: String): DateTime = dtf.parseDateTime(v)
  def marshal(v: DateTime): String = dtf.print(v)
}

class DateTimeOptionAdapter(dtf: DateTimeFormatter) extends CustomOptionAdapter[String, DateTime](new DateTimeAdapter(dtf), null, "")

@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
case class Entry(id:String
                 @xmlTypeAdapter(classOf[AtomDateTimeOptionAdapter]) published:Option[DateTime] = None {

  private def this() = this("", None)
}