scala_dynamic.scala

import scala.language.{dynamics, unsafeNulls}


class DynamicBO(m: Map[String, Any]) extends Selectable, Dynamic {
  def selectDynamic(name: String): Any = m.getOrElse(name, null)
}

type User = DynamicBO {val name: String; val age: Int}

abstract class BaseDynamic extends Dynamic

// https://www.scala-lang.org/api/current/scala/Dynamic.html
class DynamicBO2(m: collection.mutable.Map[String, Any]) extends BaseDynamic {
  def selectDynamic(name: String): Any = m.getOrElse(name, null)

  def updateDynamic(name: String)(value: Any): Unit = m.update(name, value)

  def applyDynamic(name: String)(args: Any*): Any = {
    println(s"name: ${name}, args: ${args}")
    return ()
  }
}

@main
def main(): Unit = time {
  val bo = DynamicBO(Map("name" -> "itang", "age" -> 39)).asInstanceOf[User]
  bo.name |> println
  bo.age |> println

  bo.address |> println


  val bo2 = DynamicBO2(collection.mutable.Map("name" -> "tqibm", "age" -> 25))
  bo2.name |> println
  bo2.age |> println
  bo2.age = 30
  bo2.age |> println
  bo2.setName("tom")