def validate()

in server/protocols/jmap-rfc-8621/src/main/scala/org/apache/james/jmap/mail/MailboxSet.scala [104:159]
49 lines of code
15 McCabe index (conditional complexity)

  def validate(mailboxIdFactory: MailboxId.Factory,
               serializer: MailboxSerializer,
               capabilities: Set[CapabilityIdentifier],
               mailboxSession: MailboxSession): Either[PatchUpdateValidationException, ValidatedMailboxPatchObject] = {
    val asUpdatedIterable = updates(serializer, capabilities, mailboxIdFactory, mailboxSession)

    val maybeParseException: Option[PatchUpdateValidationException] = asUpdatedIterable
      .flatMap(x => x match {
        case Left(e) => Some(e)
        case _ => None
      }).headOption

    val nameUpdate: Option[NameUpdate] = asUpdatedIterable
      .flatMap(x => x match {
        case scala.Right(NameUpdate(newName)) => Some(NameUpdate(newName))
        case _ => None
      }).headOption

    val isSubscribedUpdate: Option[IsSubscribedUpdate] = asUpdatedIterable
      .flatMap(x => x match {
        case scala.Right(IsSubscribedUpdate(isSubscribed)) => Some(IsSubscribedUpdate(isSubscribed))
        case _ => None
      }).headOption

    val rightsReset: Option[SharedWithResetUpdate] = asUpdatedIterable
      .flatMap(x => x match {
        case scala.Right(SharedWithResetUpdate(rights)) => Some(SharedWithResetUpdate(rights))
        case _ => None
      }).headOption

    val parentIdUpdate: Option[ParentIdUpdate] = asUpdatedIterable
      .flatMap(x => x match {
        case scala.Right(ParentIdUpdate(newId)) => Some(ParentIdUpdate(newId))
        case _ => None
      }).headOption

    val partialRightsUpdates: Seq[SharedWithPartialUpdate] = asUpdatedIterable.flatMap(x => x match {
      case scala.Right(SharedWithPartialUpdate(entryKey, rights)) => Some(SharedWithPartialUpdate(entryKey, rights))
      case _ => None
    }).toSeq

    val bothPartialAndResetRights: Option[PatchUpdateValidationException] = if (rightsReset.isDefined && partialRightsUpdates.nonEmpty) {
      Some(InvalidPatchException("Resetting rights and partial updates cannot be done in the same method call"))
    } else {
       None
    }
    maybeParseException
      .orElse(bothPartialAndResetRights)
      .map(e => Left(e))
      .getOrElse(scala.Right(ValidatedMailboxPatchObject(
        nameUpdate = nameUpdate,
        parentIdUpdate = parentIdUpdate,
        isSubscribedUpdate = isSubscribedUpdate,
        rightsReset = rightsReset,
        rightsPartialUpdates = partialRightsUpdates)))
  }