xuwei-k / shapeless-java-records

derive `shapeless.Generic` instances for Java Records and Sealed Classes

shapeless java records

setup

• install jdk 15 or later
• build.sbt

// if jdk 15 or 16
javacOptions ++= Seq("--enable-preview", "--release", scala.util.Properties.javaSpecVersion)

scalaVersion := // 2.12.x or 2.13.x

libraryDependencies += "com.github.xuwei-k" %% "shapeless-java-records" % "latest version"

// https://github.com/scala/bug/issues/11908
// https://github.com/scala/bug/issues/12159
compileOrder := CompileOrder.JavaThenScala

• run sbt -J--enable-preview

usage

import shapeless._
import shapeless.JavaRecordGeneric._

// summon shapeless.Generic instances
Generic[YourJavaRecordType]
Generic[YourJavaSealedType]

LabelledGeneric

import shapeless._
import shapeless.JavaRecordGeneric._
import shapeless.JavaRecordGeneric.string._ // string label
// or import shapeless.JavaRecordGeneric.symbol._

LabelledGeneric[YourJavaRecordType]
LabelledGeneric[YourJavaSealedType]

shapeless-java-records's Issues

support type params

LabelledGeneric instances for Sealed Classes

shapeless default implementation can derive scala sealed trait/class

scala> sealed trait XX; case class YY(i: Int) extends XX; case class ZZ(s: String) extends XX
trait XX
class YY
class ZZ

scala> LabelledGeneric[XX]
val res1: shapeless.LabelledGeneric[XX]{type Repr = YY with shapeless.labelled.KeyTag[Symbol with shapeless.tag.Tagged[String("YY")],YY] :+: ZZ with shapeless.labelled.KeyTag[Symbol with shapeless.tag.Tagged[String("ZZ")],ZZ] :+: shapeless.CNil} = shapeless.LabelledGeneric$$anon$2@4b5e8f34

derive LabelledGeneric

support JDK15 Sealed Classes

https://openjdk.java.net/jeps/360

add scala-js tests