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  1. import scala.util.control.Exception.catching
  2.  
  3. object Main extends App {
  4.   case class A1(yoba: String, petushok: String = "kukareku")
  5.   case class A2(peka: Int)
  6.  
  7.   type YobaKostyl = PartialFunction[AnyRef, Option[AnyRef]]
  8.  
  9.   def hasField(name: String): YobaKostyl = {
  10.     case obj ⇒
  11.       catching(classOf[NoSuchFieldException])
  12.       	.opt(obj.getClass.getDeclaredField(name)).map(_ ⇒ obj)
  13.   }
  14.  
  15.   def hasFieldValue[T](name: String, value: T): YobaKostyl = {
  16.     case obj ⇒
  17.       catching(classOf[NoSuchFieldException])
  18.       	.either(obj.getClass.getDeclaredField(name)) match {
  19.         case Left(exc) ⇒
  20.           None
  21.         case Right(field) ⇒
  22.           field.setAccessible(true)
  23.           Some(field.get(obj)).filter(value ==).map(_ ⇒ obj)
  24.       }
  25.   }
  26.  
  27.   def and(f: YobaKostyl*) = f.reduce((f1, f2) ⇒ f1.andThen(_.flatMap(f2)))
  28.   def or(obj: AnyRef, f: YobaKostyl*) = f.reduce((f1, f2) ⇒ f1.andThen(_.orElse(f2(obj))))
  29.  
  30.  
  31.   val data = Vector(A1("123"), A2(321), A1("ALLOU", "ko-ko-ko"), A2(900))
  32.  
  33.   data.flatMap { obj ⇒
  34.       or(obj, and(hasField("yoba"), hasFieldValue("petushok", "ko-ko-ko")), hasFieldValue("peka", 900))(obj)
  35.   }.foreach(println)
  36. }
  37.  
Success #stdin #stdout 0.41s 382144KB
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A1(ALLOU,ko-ko-ko)
A2(900)
https://ideone.com/9OKIap
language:
Scala (scala 2.12.8)
created:
10 years ago
visibility:
public

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