@startuml
'https://plantuml.com/state-diagram

[*] --> Lists: start_CodeLists
Lists --> Codes: start_CodeList
Codes --> Name: start_Name
Name -> Read: cdata
Name -> Codes: end_Name
Codes --> Lists: end_CodeList
Lists --> [*]: end_CodeLists

@enduml

fun interface State {
    fun eval(eventType: Int)
}

private var result = ""
private var current: State = start

fun main() {
    while (reader.hasNext())
        current.eval(reader.next())
    print(result)
}

private val start: State = State {
    when (it) {
        XMLStreamReader.START_ELEMENT ->
            if (reader.localName == "CodeLists")
                current = lists
    }
}

private val lists: State = State {
    when (it) {
        XMLStreamReader.START_ELEMENT ->
            if (reader.localName == "CodeList")
                current = codes
        XMLStreamReader.END_ELEMENT ->
            if (reader.localName == "CodeLists")
                current = start
    }
}

private val codes: State = State {
    when (it) {
        XMLStreamReader.START_ELEMENT ->
            if (reader.localName == "Name")
                result += reader.elementText + "\n"
        XMLStreamReader.END_ELEMENT ->
            if (reader.localName == "CodeList")
                current = lists
    }
}