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  1. object Main extends App {
  2.  
  3. import scala.reflect._
  4.  
  5. case class Simple(one: String, two: Int)
  6.  
  7. class SimpleBuilder {
  8.   var oneValue: Option[String] = None
  9.   var twoValue: Option[Int] = None
  10.  
  11.   def one(value: String): SimpleBuilder = {
  12.     oneValue = Some(value)
  13.     this
  14.   }
  15.  
  16.   def two(value: Int): SimpleBuilder = {
  17.     twoValue = Some(value)
  18.     this
  19.   }
  20.  
  21.   def build(): Simple = {
  22.     Simple(oneValue.getOrElse("DEFAULT"), twoValue.getOrElse(0))
  23.   }
  24. }
  25.  
  26. case class Complex(part: Double, place: String)
  27.  
  28. class ComplexBuilder {
  29.   var partValue: Option[Double] = None
  30.   var placeValue: Option[String] = None
  31.  
  32.   def part(value: Double): ComplexBuilder = {
  33.     partValue = Some(value)
  34.     this
  35.   }
  36.  
  37.   def place(value: String): ComplexBuilder = {
  38.     placeValue = Some(value)
  39.     this
  40.   }
  41.  
  42.   def build(): Complex = {
  43.     Complex(partValue.getOrElse(0.0), placeValue.getOrElse("DEFAULT"))
  44.   }
  45. }
  46.  
  47. trait Buildable[T] {
  48. 	type Result
  49. 	def newBuilder: Result
  50. }
  51.  
  52. object Buildable {
  53. 	implicit object SimpleBuildable extends Buildable[Simple] {
  54. 		type Result = SimpleBuilder
  55. 		override def newBuilder = new SimpleBuilder
  56. 	}
  57.  
  58. 	implicit object ComplexBuildable extends Buildable[Complex] {
  59. 		type Result = ComplexBuilder
  60. 		override def newBuilder = new ComplexBuilder
  61. 	}
  62.  
  63. 	def builder[T](implicit B: Buildable[T]): B.Result = B.newBuilder
  64. }
  65.  
  66. import Buildable._
  67.  
  68. println(builder[Simple].one("SOMETEXT").two(22).build())
  69. println(builder[Complex].part(3.14).place("London").build())
  70.  
  71. }
Success #stdin #stdout 0.37s 382080KB
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Simple(SOMETEXT,22)
Complex(3.14,London)
https://ideone.com/oPI7Az
language:
Scala (scala 2.12.8)
created:
9 years ago
visibility:
public

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