package test

import java.security.Principal
import kotlin.properties.ReadOnlyProperty
import kotlin.reflect.KProperty
import kotlin.reflect.KProperty1

data class TestUser(private val _name: String) : Principal {
    override fun getName(): String = _name
    override fun toString(): String = _name
}

data class Column<T>(val property: (TestUser) -> T)

abstract class Table {
    inner class DelegatedColumn<R>(val template: Column<R>) : ReadOnlyProperty<Any?, Column<R>> {
        override fun getValue(thisRef: Any?, property: KProperty<*>): Column<R> = template
    }

    fun <R> col(property: KProperty1<TestUser, R>): DelegatedColumn<R> {
        val column = Column<R>({ property.get(it) })
        return DelegatedColumn(column)
    }
}

object testUserTable : Table()
{
    val userName        by col(TestUser::name)
}

fun main(args: Array<String>) {
    println(testUserTable.userName)
}

Exception in thread "main" java.lang.ExceptionInInitializerError
	at test.testUserTable.<init>(TestDao.kt:29)
	at test.testUserTable.<clinit>(TestDao.kt:27)
	at test.TestDaoKt.main(TestDao.kt:33)
Caused by: kotlin.TypeCastException: null cannot be cast to non-null type kotlin.reflect.jvm.internal.KDeclarationContainerImpl
	at kotlin.reflect.jvm.internal.KProperty1Augmented.<init>(KPropertyFromReferenceImpl.kt:42)
	at kotlin.reflect.jvm.internal.KProperty1FromReferenceImpl.<init>(KPropertyFromReferenceImpl.kt:48)
	at kotlin.reflect.jvm.internal.ReflectionFactoryImpl.property1(ReflectionFactoryImpl.java:73)
	at kotlin.jvm.internal.Reflection.property1(Reflection.java:94)
	at test.testUserTable$userName$2.<clinit>(TestDao.kt)
	... 3 more