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‎build.sbt

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@@ -445,6 +445,16 @@ lazy val scala_libraries = (project in file("scala-libraries"))
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"org.elasticmq" %% "elasticmq-rest-sqs" % "1.6.7",
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"software.amazon.awssdk" % "sqs" % "2.27.10"
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),
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Defaults.itSettings
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)
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lazy val scala_libraries_2 = (project in file("scala-libraries-2"))
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.configs(IntegrationTest)
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.settings(
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name := "scala-libraries-2",
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scalaVersion := scala3Version,
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libraryDependencies ++= scalaTestDeps
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.map(_.withConfigurations(Some("it,test"))),
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libraryDependencies += "io.scalaland" %% "chimney" % "1.4.0",
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Defaults.itSettings
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)

‎scala-libraries-2/README.md

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## Relevant Articles:
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‎scala-libraries/src/main/scala/com/baeldung/chimney/Codec.scala renamed to ‎scala-libraries-2/src/main/scala/com/baeldung/chimney/Codec.scala

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‎scala-libraries/src/main/scala/com/baeldung/chimney/Iso.scala renamed to ‎scala-libraries-2/src/main/scala/com/baeldung/chimney/Iso.scala

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‎scala-libraries/src/main/scala/com/baeldung/chimney/PartialTransformer.scala renamed to ‎scala-libraries-2/src/main/scala/com/baeldung/chimney/PartialTransformer.scala

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‎scala-libraries/src/main/scala/com/baeldung/chimney/Patcher.scala renamed to ‎scala-libraries-2/src/main/scala/com/baeldung/chimney/Patcher.scala

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‎scala-libraries/src/main/scala/com/baeldung/chimney/Transformer.scala renamed to ‎scala-libraries-2/src/main/scala/com/baeldung/chimney/Transformer.scala

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‎scala-libraries-2/src/test/scala/com/baeldung/circe/JSONConversionsUnitTest.scala

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package com.baeldung.circe
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import com.baeldung.circe.JSONConversions.{stringJson, invalidStringJson}
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import io.circe.parser.parse
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import org.scalatest.flatspec.AnyFlatSpec
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import org.scalatest.matchers.should
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class JSONConversionsUnitTest extends AnyFlatSpec with should.Matchers {
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"Convert Json String" should "successfully" in {
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val parseResult = parse(stringJson)
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assert(parseResult.isRight)
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}
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"Convert Json String" should "fail return a Json" in {
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val parseResult = parse(invalidStringJson)
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assert(parseResult.isLeft)
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}
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}

‎scala-libraries-2/src/test/scala/com/baeldung/scala/circe/CirceUnitTest.scala

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package com.baeldung.scala.circe
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import org.scalatest.flatspec.AnyFlatSpec
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import org.scalatest.matchers.should
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class CirceUnitTest extends AnyFlatSpec with should.Matchers {
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val jsonString =
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"""{
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| "textField" : "textContent",
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| "numericField" : 123,
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| "booleanField" : true,
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| "nestedObject" : {
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| "arrayField" : [
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| 1,
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| 2,
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| 3
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| ]
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| }
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|}""".stripMargin
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val jsonStringWithMissingFields =
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"""{
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| "textField" : "textContent",
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| "nestedObject" : {
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| "arrayField" : null
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| }
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|}""".stripMargin
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"Circe" should "validate a valid JSON string" in {
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import io.circe._, io.circe.parser._
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val parseResult: Either[ParsingFailure, Json] = parse(jsonString)
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parseResult match {
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case Left(parsingError) =>
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throw new IllegalArgumentException(
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s"Invalid JSON object: ${parsingError.message}"
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)
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case Right(json) =>
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val numbers = json \\ "numericField"
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val firstNumber: Option[Option[JsonNumber]] = numbers.collectFirst {
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case field => field.asNumber
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}
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val singleOption: Option[Int] = firstNumber.flatten.flatMap(_.toInt)
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singleOption shouldEqual Some[Int](123)
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}
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}
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it should "convert JSON into object using converters and back to original string" in {
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import io.circe._, io.circe.generic.semiauto._, io.circe.parser._,
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io.circe.syntax._
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case class Nested(arrayField: List[Int])
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case class OurJson(
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textField: String,
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numericField: Int,
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booleanField: Boolean,
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nestedObject: Nested
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)
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implicit val nestedDecoder: Decoder[Nested] = deriveDecoder[Nested]
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implicit val jsonDecoder: Decoder[OurJson] = deriveDecoder[OurJson]
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decode[OurJson](jsonString) shouldEqual Right(
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OurJson("textContent", 123, true, Nested(List(1, 2, 3)))
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)
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val decoded = decode[OurJson](jsonString)
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implicit val nestedEncoder: Encoder[Nested] = deriveEncoder[Nested]
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implicit val jsonEncoder: Encoder[OurJson] = deriveEncoder[OurJson]
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decoded match {
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case Right(decodedJson) =>
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val jsonObject: Json = decodedJson.asJson
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jsonObject.spaces2 shouldEqual jsonString
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}
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}
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it should "decode a JSON with missing fields" in {
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import io.circe._, io.circe.generic.semiauto._, io.circe.parser._
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val jsonStringWithMissingFields =
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"""{
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| "textField" : "textContent",
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| "nestedObject" : {
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| "arrayField" : null
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| }
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|}""".stripMargin
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case class Nested(arrayField: Option[List[Int]])
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case class OurJson(
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textField: String,
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numericField: Option[Int],
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booleanField: Option[Boolean],
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nestedObject: Nested
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)
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implicit val nestedDecoder: Decoder[Nested] = deriveDecoder[Nested]
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implicit val jsonDecoder: Decoder[OurJson] = deriveDecoder[OurJson]
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decode[OurJson](jsonStringWithMissingFields) shouldEqual Right(
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OurJson("textContent", None, None, Nested(None))
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)
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}
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it should "decode a JSON with missing fields using a custom decoder" in {
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import io.circe._, io.circe.generic.semiauto._, io.circe.parser._
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case class Nested(arrayField: List[Int])
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case class OurJson(
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textField: String,
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numericField: Option[Int],
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booleanField: Option[Boolean],
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nestedObject: Nested
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)
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implicit val decodeNested: Decoder[Nested] = (c: HCursor) =>
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for {
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arrayField <- c.downField("arrayField").as[Option[List[Int]]]
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} yield {
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val flattenedArray = arrayField.getOrElse(Nil)
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Nested(flattenedArray)
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}
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implicit val jsonDecoder: Decoder[OurJson] = deriveDecoder[OurJson]
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decode[OurJson](jsonStringWithMissingFields) shouldEqual Right(
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OurJson("textContent", None, None, Nested(Nil))
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)
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val jsonStringWithArray =
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"""{
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| "textField" : "textContent",
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| "nestedObject" : {
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| "arrayField" : [1, 2]
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| }
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|}""".stripMargin
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decode[OurJson](jsonStringWithArray) shouldEqual Right(
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OurJson("textContent", None, None, Nested(List(1, 2)))
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)
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}
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it should "use automatic decoder derivation" in {
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import io.circe.generic.auto._, io.circe.parser
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case class Nested(arrayField: List[Int])
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case class OurJson(
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textField: String,
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numericField: Int,
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booleanField: Boolean,
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nestedObject: Nested
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)
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parser.decode[OurJson](jsonString) shouldEqual Right(
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OurJson("textContent", 123, true, Nested(List(1, 2, 3)))
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)
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}
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}

‎scala-libraries-2/src/test/scala/com/baeldung/scala/circe/CustomDecoderUnitTest.scala

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package com.baeldung.scala.circe
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import org.scalatest.flatspec.AnyFlatSpec
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import org.scalatest.matchers.should
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import io.circe._
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import io.circe.generic.semiauto._
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import io.circe.parser._
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class CustomDecoderUnitTest extends AnyFlatSpec with should.Matchers {
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val jsonStringWithNullArray =
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"""{
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| "textField" : "textContent",
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| "nestedObject" : {
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| "arrayField" : null
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| }
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|}""".stripMargin
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val jsonStringWithMissingArray =
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"""{
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| "textField" : "textContent",
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| "nestedObject" : {
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| }
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|}""".stripMargin
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val jsonStringWithArray =
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"""{
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| "textField" : "textContent",
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| "nestedObject" : {
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| "arrayField" : [1, 2]
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| }
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|}""".stripMargin
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val jsonStringWithEmptyArray =
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"""{
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| "textField" : "textContent",
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| "nestedObject" : {
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| "arrayField" : []
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| }
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|}""".stripMargin
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case class Nested(arrayField: List[Int])
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case class OurJson(
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textField: String,
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numericField: Option[Int],
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booleanField: Option[Boolean],
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nestedObject: Nested
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)
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implicit val decodeNested: Decoder[Nested] = (c: HCursor) =>
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for {
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arrayField <- c.downField("arrayField").as[Option[List[Int]]]
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} yield {
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val flattenedArray = arrayField.getOrElse(Nil)
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Nested(flattenedArray)
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}
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implicit val jsonDecoder: Decoder[OurJson] = deriveDecoder[OurJson]
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"A custom decoder" should "decode a JSON with a null array value" in {
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decode[OurJson](jsonStringWithNullArray) shouldEqual Right(
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OurJson("textContent", None, None, Nested(Nil))
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)
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}
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it should "decode a JSON with a missing field" in {
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decode[OurJson](jsonStringWithMissingArray) shouldEqual Right(
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OurJson("textContent", None, None, Nested(Nil))
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)
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}
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it should "decode a JSON with an existing array value" in {
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decode[OurJson](jsonStringWithArray) shouldEqual Right(
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OurJson("textContent", None, None, Nested(List(1, 2)))
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)
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}
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it should "decode a JSON with an empty array" in {
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decode[OurJson](jsonStringWithEmptyArray) shouldEqual Right(
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OurJson("textContent", None, None, Nested(Nil))
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)
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}
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}

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