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private static final FormMapping<Registration> registrationForm =
Forms.automatic(Registration.class, "registration")
  .nested(Forms.automatic(Address.class, "contactAddress", 
    Forms.factoryMethod(Address.class, "getInstance")).build())
  .build();

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private static final FormMapping<RegDate> regDateMapping = 
  Forms.basic(RegDate.class, "regDate").fields("month", "year").build();
private static final FormMapping<Registration> registrationForm =
	Forms.basic(Registration.class, "registration")
	  // whitelist of properties to bind
	  .fields("attendanceReasons", "cv", "interests", "email")
	  .nested(Forms.automatic(UploadedFileWrapper.class, "certificates", 
	    null, MappingType.LIST).build())
	  .nested(Forms.basic(Address.class, "contactAddress", 
	    Forms.factoryMethod(Address.class, "getInstance"))

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private static final FormMapping<Person> personForm =
  Forms.automatic(Person.class, "person").build();
…
FormData<Person> formData = new FormData<Person>(person, null);
FormMapping<Person> filledForm = personForm.fill(formData);
// push filledForm to template …
…
FormData<Person> formData = personForm.bind(
  new HttpServletRequestParams(request));
if (formData.isValid()) {

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package com.spinoco.dojo

import scalaz.concurrent.Task
import scalaz.stream.{ process1, Process }
import Process._
import scala.concurrent.duration._
import scalaz.stream.io

/*
  Time to put it all together.

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package com.spinoco.dojo

import scalaz.stream.Process
import Process._
import scalaz.concurrent.Task
import scala.util.Random

object Dojo extends Dojo

trait Dojo {

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object NonDefaultResources {
  implicit object MySpecificUrlResource extends Resource[URL] {
    // ...
  }
}

def main(args: Array[String]) {
  import NonDefaultResources.MySpecificUrlResource

  println("Children of URL: \n: " +

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// Ad 1) Type class trait ("utility" rozhraní, na které budou 
// adaptovány konkrétní zdroje):
trait Resource[R] {
  def hasChildren(res: R): Boolean
  def children(res: R): Seq[R]
}

// Ad 2) Companion object s výchozími implicitními implementacemi
// type class traitu pro URL a File: 
object Resource {

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package com.examples.img

import java.io.File
import scala.sys.process._

class ImageMagickConverter(convertExec: String) {

  def resizeImage(in: File, out: File, width: Int, height: Int, quality: Int = ImageMagickConverter.DefaultQuality): Boolean = {
    val qual = if (quality < 0) ImageMagickConverter.DefaultQuality else if (quality > 100) 100 else quality
    val inAbsPath = in.getAbsolutePath()

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package controllers

import play.api.mvc.Action
import play.api.mvc.Controller
import scala.concurrent.future
import scala.concurrent.ExecutionContext.Implicits.global
import play.api.Logger

object Performance extends Controller {

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concurrent.Future {
  // Nejaky blokujici kod pristupujici k databazi
}(Contexts.myDbOperationContext)