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• KeyWrites.scala

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play.api.libs.json.KeyWrites.scala Maven / Gradle / Ivy

/*
 * Copyright (C) from 2022 The Play Framework Contributors , 2011-2021 Lightbend Inc. 
 */

package play.api.libs.json

/**
 * Used to write object key for types other than `String`.
 *
 * @see [[Writes.keyMapWrites]]
 */
trait KeyWrites[T] {
  def writeKey(key: T): String
}

object KeyWrites extends EnvKeyWrites {

  /**
   * Returns an instance which uses `f` as [[KeyWrites.writeKey]] function.
   */
  def apply[T](f: T => String): KeyWrites[T] = new KeyWrites[T] {
    def writeKey(key: T) = f(key)
  }

  implicit def anyValKeyWrites[T <: AnyVal]: KeyWrites[T] =
    KeyWrites[T](_.toString)
}