OptionalBinders.scala

package util

import play.api.mvc.QueryStringBindable

import java.util.{OptionalDouble, OptionalInt, OptionalLong}
import scala.compat.java8.OptionConverters.{RichOptionalDouble, RichOptionalInt, RichOptionalLong}

object OptionalBinders {
  /**
   * QueryString binder for Java OptionalInt.
   */
  implicit object bindableJavaOptionalInt extends QueryStringBindable[OptionalInt] {
    def bind(key: String, params: Map[String, Seq[String]]) = {
      Some(
        implicitly[QueryStringBindable[Int]]
          .bind(key, params)
          .map(_.right.map(OptionalInt.of))
          .getOrElse(Right(OptionalInt.empty))
      )
    }

    def unbind(key: String, value: OptionalInt) = value.asScala.getOrElse(0).toString
  }

  /**
   * QueryString binder for Java OptionalLong.
   */
  implicit object bindableJavaOptionalLong extends QueryStringBindable[OptionalLong] {
    def bind(key: String, params: Map[String, Seq[String]]) = {
      Some(
        implicitly[QueryStringBindable[Long]]
          .bind(key, params)
          .map(_.right.map(OptionalLong.of))
          .getOrElse(Right(OptionalLong.empty))
      )
    }

    def unbind(key: String, value: OptionalLong) = value.asScala.getOrElse(0).toString
  }

  /**
   * QueryString binder for Java OptionalDouble.
   */
  implicit object bindableJavaOptionalDouble extends QueryStringBindable[OptionalDouble] {
    def bind(key: String, params: Map[String, Seq[String]]) = {
      Some(
        implicitly[QueryStringBindable[Double]]
          .bind(key, params)
          .map(_.right.map(OptionalDouble.of))
          .getOrElse(Right(OptionalDouble.empty))
      )
    }

    def unbind(key: String, value: OptionalDouble) = value.asScala.getOrElse(0).toString
  }
}