kinvoke

package example

import com.fasterxml.jackson.databind.JsonNode
import com.fasterxml.jackson.databind.ObjectMapper

import java.util.stream.Stream
import java.util.stream.StreamSupport

import org.w3c.dom.Document
import org.w3c.dom.Element
import org.w3c.dom.Node
import org.w3c.dom.NodeList
import javax.xml.parsers.DocumentBuilderFactory

data class Event(val id: Int)

val stringToEvent: (String) -> Event = { s -> Event(s.toInt()) }
val dummyToEvent: (Document) -> Event = { _ -> Event(1) }
val jsonToEvent: (JsonNode) -> Event = { j -> Event(j.get("id").asInt()) }

fun elementGen(opt: String): Any {
    return when(opt) {
        "string" -> "1"
        "json" -> {
            val mapper = ObjectMapper()
            mapper.readTree("{\"id\": 1 }")
        }
        "xml" -> {
            DocumentBuilderFactory.newInstance().newDocumentBuilder().parse("<id>1</id>")
        }
        else -> throw RuntimeException("Option not supported")
    }
}

fun main(args : Array<String>) {

    val parser = when (args[0]) {
        "string" -> stringToEvent
        "json" -> jsonToEvent
        "xml" -> dummyToEvent
        else -> throw RuntimeException("Option not supported")
    }

    print(parser(elementGen(args[0])))
}