对案例类字段的简单迭代

Question

我正在尝试编写一个泛型方法来迭代案例类的字段:

case class PriceMove(price: Double, delta: Double)

def log(pm : PriceMove) { info("price -> " + price + " delta -> " + delta)}

我需要log能够处理任何案例类.什么只需要log处理case类的参数类型和实际的泛型字段迭代代码？

Answer 1

好的,考虑到我对问题的两个问题,这就是我使用的:

object Implicits {
  implicit class CaseClassToString(c: AnyRef) {
    def toStringWithFields: String = {
      val fields = (Map[String, Any]() /: c.getClass.getDeclaredFields) { (a, f) =>
        f.setAccessible(true)
        a + (f.getName -> f.get(c))
      }

      s"${c.getClass.getName}(${fields.mkString(", ")})"
    }
  }
}

case class PriceMove(price: Double, delta: Double)

object Test extends App {
  import Implicits._
  println(PriceMove(1.23, 2.56).toStringWithFields)
}

这会产生:

PriceMove(price -> 1.23, delta -> 2.56)