Created
May 9, 2018 11:10
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| import org.json4s.{DefaultFormats, Formats, JNothing, JValue} | |
| import org.json4s.native.JsonMethods.{parse => jParser} | |
| import org.json4s.native.Serialization | |
| import org.json4s.native.Serialization.{write => jWrite} | |
| trait JsonHelper extends { | |
| val EMPTY_STRING = "" | |
| implicit val serialization: Serialization.type = Serialization | |
| implicit val formats: Formats = DefaultFormats | |
| /* | |
| takes any type of value and serializes it to string | |
| eg: val student = Student(1,"deepankar") | |
| write(student) will serialize it to {"rollNum":1,"name":"deepankar"} | |
| */ | |
| def write[T <: AnyRef](value: T): String = jWrite(value) | |
| /* | |
| Any valid json can be parsed into internal AST(Abstract Syntax Tree) format. | |
| eg : If this is our json string coming from a post request | |
| val jsonString = {"rollNum":1,"name":"deepankar"} | |
| parse(jsonString) will parse it to something like | |
| JObject(List((rollNum,JInt(1)), (name,JString(deepankar)))) | |
| */ | |
| protected def parse(value: String): JValue = jParser(value) | |
| implicit protected def extractOrEmptyString(json: JValue): String = { | |
| json match { | |
| case JNothing => EMPTY_STRING | |
| case data => data.extract[String] | |
| } | |
| } | |
| } |
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