InstanceCreators

Some serializable classes can't be initiated via an empty constructor. This is where InstanceCreators come in. For example, an EnumMap needs the enum class as a constructor parameter. So we can use the Type parameter retrieved when calling a serialization function to pass the enum class.

EnumMapInstanceCreator

object EnumMapInstanceCreator : InstanceCreator<EnumMap<*, *>> {

    override fun createInstance(type: KType): EnumMap<*, *> {
        val clazz = type.arguments[0].type!!.classifierClass!!.java
        return createEnumMap(clazz)
    }

    @Suppress("UNCHECKED_CAST")
    private fun <E : Enum<E>> createEnumMap(clazz: Class<*>): EnumMap<*, *> {
        return EnumMap<E, Any>(clazz as Class<E>)
    }

}

You can register it similarly to BinaryAdapters.

registerInstanceCreator(EnumMap::class, EnumMapInstanceCreator)

Note

This instance creator is registered by default.