daharon · April 8, 2022 23:34
diff --git a/JacksonJsonSugar.scala b/JacksonJsonSugar.scala
 package us.aharon.test.json

 import com.fasterxml.jackson.databind.json.JsonMapper
 import com.fasterxml.jackson.module.scala.DefaultScalaModule

 import scala.reflect.{ClassTag, classTag}

 /**
 * Extension methods for [[String]]s.
 */
 private object StringExtension {
  /**
   * [[String]]s that contain JSON objects.
   */
  implicit class JsonString(self: String) {
    /**
     * Convert the JSON [[String]] to the type provided by [[T]].
     * @param mapper A Jackson JSON mapper instance.
     * @tparam T Deserialize to this type.
     */
    def fromJson[T: ClassTag]()(implicit mapper: JsonMapper): T =
      mapper.readValue(self, classTag[T].runtimeClass.asInstanceOf[Class[T]])
  }
 }

 /**
 * Include the implicit JSON mapper.
 */
 trait JsonSupport {
  implicit val mapper: JsonMapper = JsonMapper.builder()
    .addModule(DefaultScalaModule)
    .build()
 }

 object JacksonJsonSugar extends App with JsonSupport {

  /**
   * Example object as a target for JSON deserialization.
   */
  case class Example(a: Int, b: Double, c: String)

  val exampleJson =
    """
      |{
      |  "a": 1,
      |  "b": 2.2,
      |  "c": "example"
      |}""".stripMargin

  val expected = Example(1, 2.2, "example")

  import us.aharon.test.json.StringExtension.JsonString
  val actual = exampleJson.fromJson[Example]

  println(s"Example JSON:\n$exampleJson")
  println(s"Expected:  $expected")
  println(s"Actual:  $actual")

  assert(expected == actual)
 }
	package us.aharon.test.json

	import com.fasterxml.jackson.databind.json.JsonMapper
	import com.fasterxml.jackson.module.scala.DefaultScalaModule

	import scala.reflect.{ClassTag, classTag}

	/**
	* Extension methods for [[String]]s.
	*/
	private object StringExtension {
	/**
	* [[String]]s that contain JSON objects.
	*/
	implicit class JsonString(self: String) {
	/**
	* Convert the JSON [[String]] to the type provided by [[T]].
	* @param mapper A Jackson JSON mapper instance.
	* @tparam T Deserialize to this type.
	*/
	def fromJson[T: ClassTag]()(implicit mapper: JsonMapper): T =
	mapper.readValue(self, classTag[T].runtimeClass.asInstanceOf[Class[T]])
	}
	}

	/**
	* Include the implicit JSON mapper.
	*/
	trait JsonSupport {
	implicit val mapper: JsonMapper = JsonMapper.builder()
	.addModule(DefaultScalaModule)
	.build()
	}

	object JacksonJsonSugar extends App with JsonSupport {

	/**
	* Example object as a target for JSON deserialization.
	*/
	case class Example(a: Int, b: Double, c: String)

	val exampleJson =
	"""
	\|{
	\| "a": 1,
	\| "b": 2.2,
	\| "c": "example"
	\|}""".stripMargin

	val expected = Example(1, 2.2, "example")

	import us.aharon.test.json.StringExtension.JsonString
	val actual = exampleJson.fromJson[Example]

	println(s"Example JSON:\n$exampleJson")
	println(s"Expected: $expected")
	println(s"Actual: $actual")

	assert(expected == actual)
	}