Extension.scala.patch

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> import org.slf4j.{ Logger, LoggerFactory }
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>   private val log: Logger = LoggerFactory.getLogger(getClass)
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<       Try(
<         new Extension(
<           cursor.decodeAs[Option[String]]("id", Some(None)),
<           cursor.decodeAs[String]("url", None),
<           cursor.decodeOptRef[UnionAll]("value"),
<           cursor.decodeAs[LitSeq[Extension]]("extension", Some(LitSeq.empty)),
<           decodeAttributes(cursor)
---
>       cursor.downField("url").as[String].toTry.flatMap { url =>
>         def genericExtension = Try(
>           new Extension(
>             cursor.decodeAs[Option[String]]("id", Some(None)),
>             cursor.decodeAs[String]("url", None),
>             cursor.decodeOptRef[UnionAll]("value"),
>             cursor.decodeAs[LitSeq[Extension]]("extension", Some(LitSeq.empty)),
>             decodeAttributes(cursor)
>           )
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<       ))
---
>         if (!params.decodeSpecificExtensions) genericExtension
>         else {
>           val specificExtension = urlLookup.get(url)
>           specificExtension match {
>             case None =>
>               if (params.logOnMissingExtension) log.warn(s"Missing extension $url")
>               genericExtension
>             case Some(ext) =>
>               Try(ext.decodeThis(cursor).asInstanceOf[Try[Extension]]).flatten.recoverWith {
>                 case t if params.tolerateExtensionErrors =>
>                   log.warn(s"Failed to decode extension $url", t)
>                   genericExtension
>               }
>           }
>         }
>       })
>