Johnson Lee johnsonlee

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Full Stack Engineer, focus on Android application architecture, mobile infrastructure, my personal blog 👉https://johnsonlee.io

bnorm / xref.kt

Last active November 29, 2020 08:41

One to many relationship via property delegation - Inspiration: https://github.com/jcornaz/xref

	object OneToMany {

	private class One<O, M, C : MutableCollection<M>>(initial: O?, private val rightProperty: KMutableProperty1<O, C>) : ReadWriteProperty<M, O?> {
	var one: O? = initial

	override fun getValue(thisRef: M, property: KProperty<*>): O? = one

	override fun setValue(thisRef: M, property: KProperty<*>, value: O?) {
	when {
	value != null -> add(value, thisRef)