Scala Manifest类代码示例

//设置package包名称以及导入依赖的类
package util

import java.io.StringWriter

import com.fasterxml.jackson.databind.{DeserializationFeature, ObjectMapper}
import com.fasterxml.jackson.module.scala.DefaultScalaModule
import com.fasterxml.jackson.module.scala.experimental.ScalaObjectMapper

import scala.reflect.{ClassTag, Manifest}

object JsonUtil {

  val mapper = new ObjectMapper() with ScalaObjectMapper
  mapper.registerModule(DefaultScalaModule)
  mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)

  def toJson[T](data: T): String = {
    val out = new StringWriter()
    mapper.writeValue(out, data)
    out.toString
  }

  def fromJson[T: ClassTag](json: String)(implicit m: Manifest[T]): T =
    mapper.readValue[T](json)
} 

//设置package包名称以及导入依赖的类
package ru.finagram.test

import org.mockito.verification.VerificationWithTimeout
import org.mockito.{ ArgumentCaptor, Mockito }

import scala.concurrent.duration._
import scala.reflect.Manifest

trait MockitoSugar extends org.scalatest.mockito.MockitoSugar {

  def any[T <: Any](implicit manifest: Manifest[T]): T = {
    org.mockito.Matchers.any(manifest.runtimeClass.asInstanceOf[Class[T]])
  }

  def argumentCaptor[T <: Any](implicit manifest: Manifest[T]): ArgumentCaptor[T] = {
    ArgumentCaptor.forClass(manifest.runtimeClass.asInstanceOf[Class[T]])
  }

  def timeout(duration: Duration): VerificationWithTimeout = {
    Mockito.timeout(duration.toMillis.toInt)
  }
} 

//设置package包名称以及导入依赖的类
package sbtmarathon

import scala.reflect.{Manifest, ManifestFactory}
import org.json4sbt.{Formats, JValue, JObject, JArray, JString}

object ManifestSerialization {

  private val NameKey = "runtimeName"

  private val TypeParamsKey = "typeArguments"

  def manifestOf[A : Manifest]: Manifest[_] = manifest[A]

  def emit(m: Manifest[_]): JValue = {
    val head = NameKey -> JString(m.runtimeClass.getName)
    val tail = m.typeArguments.map(emit) match {
      case Nil => Nil
      case jvalues => (TypeParamsKey -> JArray(jvalues)) :: Nil
    }
    JObject((head :: tail): _*)
  }

  def parse(jvalue: JValue)(implicit formats: Formats): Manifest[_] = {
    val runtimeManifest = manifestFromString((jvalue \ NameKey).extract[String])
    val typeArguments = jvalue \ TypeParamsKey match {
      case JArray(jvalues) => jvalues.map(parse)
      case _ => Nil
    }
    typeArguments match {
      case Nil => runtimeManifest
      case head :: tail => ManifestFactory.classType(runtimeManifest.runtimeClass, head, tail: _*)
    }
  }

  private def manifestFromString(value: String): Manifest[_] = value match {
    case "boolean"  => manifestOf[Boolean]
    case "byte"     => manifestOf[Byte]
    case "char"     => manifestOf[Char]
    case "short"    => manifestOf[Short]
    case "int"      => manifestOf[Int]
    case "long"     => manifestOf[Long]
    case "float"    => manifestOf[Float]
    case "double"   => manifestOf[Double]
    case _          => ManifestFactory.classType(Class.forName(value))
  }
} 

//设置package包名称以及导入依赖的类
package sbtmarathon

import scala.reflect.Manifest
import org.json4sbt._
import org.json4sbt.jackson.JsonMethods
import org.scalatest.{FlatSpec, Matchers}

class ManifestSerializationSpec extends FlatSpec with Matchers {

  import ManifestSerialization._

  behavior of "ManifestSerializer"

  Seq(
    manifestOf[String],
    manifestOf[Int],
    manifestOf[Array[String]],
    manifestOf[List[String]],
    manifestOf[Map[String, Seq[Int]]],
    manifestOf[Map[String, Seq[Map[java.lang.Integer, String]]]]
  ).foreach { m =>
    it should s"emit and parse JSON representation of Manifest[$m]" in {
      ensureSuccessfulRoundTrip(m)
    }
  }

  def ensureSuccessfulRoundTrip(manifest: Manifest[_]): Unit = {
    implicit val formats = DefaultFormats
    val json = JsonMethods.compact(JsonMethods.render(emit(manifest)))
    manifest shouldBe parse(JsonMethods.parse(json))
  }
}