How to encode and decode an enum class? Could you provide a simple example? about 4koma

[valderman]

As of version 1.1.0, this will be handled automatically:

enum class MyEnum { Foo, Bar, Baz }
data class MyConfig(val someEnumValue: MyEnum)

fun main() {
    val mapper = tomlMapper { }
    val config = mapper.decode<MyConfig>("someEnumValue = \"Bar\"")
    println(config) // prints MyConfig(someEnumValue = MyEnum.Bar)
}

However, in 1.0.x and earlier you need to register a custom decoder for each enum type:

enum class MyEnum { Foo, Bar, Baz }
data class MyConfig(val someEnumValue: MyEnum)

fun main() {
    val mapper = tomlMapper {
        decoder { str: TomlValue.String -> MyEnum.valueOf(str.value) }
    }
    val config = mapper.decode<MyConfig>("someEnumValue = \"Bar\"")
    println(config) // prints MyConfig(someEnumValue = MyEnum.Bar)
}