How to type cast Any dynamically in scala?

Question

I want to convert "Any" object into an object of runtime type. Based on the class name (string) at the runtime, how do I convert an ANY object to actual object?

I tried using converting class name into class object using Class.forName

val clazz = Class.forName("my.package.Animal")
val any: Any = Animal(1, "simba")
any.asInstanceOf[clazz] // Compilation Error // Looking for a solution

Answer 1

Try to use

• compiler toolbox

  package my.package
  
  import scala.tools.reflect.ToolBox
  import scala.reflect.runtime.universe._
  
  case class Animal(id: Int, name: String)
  
  object App {    
    val any: Any = Animal(1, "simba")
    val className = "my.package.Animal"
  
    val mirror = runtimeMirror(getClass.getClassLoader)
    val tb = mirror.mkToolBox()
    tb.eval(tb.parse(
      s"""
        import my.package.App._
        val animal = any.asInstanceOf[$className]
        println(animal.id)
        println(animal.name)
      """))
  }
  

libraryDependencies += scalaOrganization.value % "scala-reflect" % scalaVersion.value

libraryDependencies += scalaOrganization.value % "scala-compiler" % scalaVersion.value

• or Scala reflection

  import scala.reflect.runtime.universe._
  
  val mirror = runtimeMirror(getClass.getClassLoader)
  val classSymbol = mirror.staticClass(className)
  val typ = classSymbol.toType
  val idMethodSymbol = typ.decl(TermName("id")).asMethod
  val nameMethodSymbol = typ.decl(TermName("name")).asMethod
  val instanceMirror = mirror.reflect(any)
  val idMethodMirror = instanceMirror.reflectMethod(idMethodSymbol)
  val nameMethodMirror = instanceMirror.reflectMethod(nameMethodSymbol)
  println(idMethodMirror())
  println(nameMethodMirror())
  

libraryDependencies += scalaOrganization.value % "scala-reflect" % scalaVersion.value

• or Java reflection

  val clazz = Class.forName(className)
  val idMethod = clazz.getMethod("id")
  val nameMethod = clazz.getMethod("name")
  println(idMethod.invoke(any))
  println(nameMethod.invoke(any))