Scala Json parsing - json

Question

This is the input json which I am getting which is nested json structure and I don't want to map directly to class, need custom parsing of some the objects as I have made the case classes
{
"uuid": "b547e13e-b32d-11ec-b909-0242ac120002",
"log": {
"Response": {
"info": {
"receivedTime": "2022-02-09T00:30:00Z",
"isSecure": "Yes",
"Data": [{
"id": "75641",
"type": "vendor",
"sourceId": "3",
"size": 53
}],
"Group": [{
"isActive": "yes",
"metadata": {
"owner": "owner1",
"compressionType": "gz",
"comments": "someComment",
"createdDate": "2022-01-11T11:00:00Z",
"updatedDate": "2022-01-12T14:17:55Z"
},
"setId": "1"
},
{
"isActive": "yes",
"metadata": {
"owner": "owner12",
"compressionType": "snappy",
"comments": "someComment",
"createdDate": "2022-01-11T11:00:00Z",
"updatedDate": "2022-01-12T14:17:55Z"
},
"setId": "2"
},
{
"isActive": "yes",
"metadata": {
"owner": "owner123",
"compressionType": "snappy",
"comments": "someComment",
"createdDate": "2022-01-11T11:00:00Z",
"updatedDate": "2022-01-12T14:17:55Z"
},
"setId": "4"
},
{
"isActive": "yes",
"metadata": {
"owner": "owner124",
"compressionType": "snappy",
"comments": "someComments",
"createdDate": "2022-01-11T11:00:00Z",
"updatedDate": "2022-01-12T14:17:55Z"
},
"setId": "4"
}
]
}
}
}
}
Code that I am trying play json also tried circe . Please help ..New to scala world
below is object and case class
case class DataCatalog(uuid: String, data: Seq[Data], metadata: Seq[Metadata])
object DataCatalog {
case class Data(id: String,
type: String,
sourceId: Option[Int],
size: Int)
case class Metadata(isActive: String,
owner: String,
compressionType: String,
comments: String,
createdDate: String,
updatedDate: String
)
def convertJson(inputjsonLine: String): Option[DataCatalog] = {
val result = Try {
//val doc: Json = parse(line).getOrElse(Json.Null)
//val cursor: HCursor = doc.hcursor
//val uuid: Decoder.Result[String] = cursor.downField("uuid").as[String]
val lat = (inputjsonLine \ "uuid").get
DataCatalog(uuid, data, group)
}
//do pattern matching
result match {
case Success(dataCatalog) => Some(dataCatalog)
case Failure(exception) =>
}
}
}
Any parsing api is fine.

Answer 1

If you use Scala Play, for each case class you should have an companion object which will help you a lot with read/write object in/from json:
object Data {
import play.api.libs.json._
implicit val read = Json.reads[Data ]
implicit val write = Json.writes[Data ]
def tupled = (Data.apply _).tupled
}
object Metadata {
import play.api.libs.json._
implicit val read = Json.reads[Metadata ]
implicit val write = Json.writes[Metadata ]
def tupled = (Metadata.apply _).tupled
}
Is required as each companion object to be in same file as the case class. For your json example, you need more case classes because you have a lot of nested objects there (log, Response, info, each of it)
or, you can read the field which you're interested in as:
(jsonData \ "fieldName").as[CaseClassName]
You can try to access the Data value as:
(jsonData \ "log" \ "Response" \ "info" \ "Data").as[Data]
same for Metadata