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encode-decode's Introduction

encode / decode

library	link
jackson	https://github.com/FasterXML/jackson
protobuf	https://developers.google.com/protocol-buffers
Thirft	https://thrift.apache.org/
Avro	https://github.com/prayagupa/avro-in-makwanpur
circe	https://circe.github.io/circe/
argonaut	https://github.com/argonaut-io/argonaut
play.json lib	https://www.playframework.com/documentation/2.6.x/ScalaJson
json4s	https://github.com/json4s/json4s

// find ~/.m2/repository/ -name "*.jar" | tr '\n' ':'

jshell --class-path $(find ~/.m2/repository/com/fasterxml/ -name "*.jar" | tr '\n' ':') --enable-preview
|  Welcome to JShell -- Version 12.0.1
|  For an introduction type: /help intro

jshell> import com.fasterxml.jackson.databind.ObjectMapper

jshell> var om = new ObjectMapper()
om ==> com.fasterxml.jackson.databind.ObjectMapper@30a3107a

jshell> import com.fasterxml.jackson.core.*
jshell> var json = om.readTree("{\"config\": [{ \"name\": \"a\"}, {\"name\": \"b\"}] }")
json ==> {"config":[{"name":"a"},{"name":"b"}]}

jshell> import com.fasterxml.jackson.core.JsonPointer
jshell> json.at("/config")
$12 ==> [{"name":"a"},{"name":"b"}]

jshell> json.at("/config").forEach(v -> System.out.println(v))
{"name":"a"}
{"name":"b"}

scala> val json = om.readTree("""{"config": [{ "name": "a"}, {"name": "b"}, {"name": ""}] }""")
json: com.fasterxml.jackson.databind.JsonNode = {"config":[{"name":"a"},{"name":"b"},{"name":""}]}

scala> json.at("/config").forEach(a => println(a.at("/name").textValue.nonEmpty))
true
true
false

proto

brew install protobuf
brew upgrade protobuf

protoc src/main/resources/sku.proto --java_out=src/main/java/data/

Note

install https://github.com/mplushnikov/lombok-intellij-plugin for idea 2019.3.+

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play json serialisers

Play Serialisers

scala> import play.api.libs.json.Json._
import play.api.libs.json.Json._

scala> import play.api.libs.json._
import play.api.libs.json._

scala> final case class Android(name: String, version: String)
defined class Android

scala> final case class AiResponse[T](body: T)
defined class AiResponse

scala> implicit val androidFormat: Format[Android] = Json.format[Android]
androidFormat: play.api.libs.json.Format[Android] = play.api.libs.json.OFormat$$anon$1@2cb66c68

scala> val androidAiResponseFormat = Json.format[AiResponse[Android]]
androidAiResponseFormat: play.api.libs.json.OFormat[AiResponse[Android]] = play.api.libs.json.OFormat$$anon$1@704adf36

Serialisation

scala> Json.toJson(AiResponse(body = Android(name = "android", version = "1.0")))
res1: play.api.libs.json.JsValue = {"body":{"name":"android","version":"1.0"}}

Deserialisation

scala> Json.fromJson[AiResponse[Android]](Json.parse("""{"body":{"name":"android","version":"1.0"}}"""))
res3: play.api.libs.json.JsResult[AiResponse[Android]] = JsSuccess(AiResponse(Android(android,1.0)),)

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