commonMain.entity.optional.delegate.OptionalDelegate.kt Maven / Gradle / Ivy

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package dev.kord.common.entity.optional.delegate

import dev.kord.common.entity.optional.Optional
import kotlin.js.JsName
import kotlin.jvm.JvmName
import kotlin.properties.ReadWriteProperty
import kotlin.reflect.KMutableProperty0
import kotlin.reflect.KProperty

public fun  KMutableProperty0>.delegate(): ReadWriteProperty =
    object : ReadWriteProperty {

        override fun setValue(thisRef: Any?, property: KProperty<*>, value: V?) {
            val optional = if (value == null) Optional.Missing()
            else Optional.Value(value)

            [email protected](optional)
        }

        override fun getValue(thisRef: Any?, property: KProperty<*>): V? {
            return when (val optional = [email protected]()) {
                is Optional.Value -> optional.value
                is Optional.Missing, is Optional.Null<*> -> null
            }
        }
    }

public fun  KMutableProperty0>>.delegateList(): ReadWriteProperty> =
    object : ReadWriteProperty> {

        override fun setValue(thisRef: Any?, property: KProperty<*>, value: List) {
            val optional = if (value.isEmpty()) Optional.Missing()
            else Optional.Value(value)

            [email protected](optional)
        }

        override fun getValue(thisRef: Any?, property: KProperty<*>): List {
            return when (val optional = [email protected]()) {
                is Optional.Value -> optional.value
                is Optional.Missing, is Optional.Null<*> -> emptyList()
            }
        }
    }

@JvmName("provideNullableDelegate")
@JsName("provideNullableDelegate")
public fun  KMutableProperty0>.delegate(): ReadWriteProperty =
    object : ReadWriteProperty {

        override fun getValue(thisRef: Any?, property: KProperty<*>): V? {
            return [email protected]().value
        }

        override fun setValue(thisRef: Any?, property: KProperty<*>, value: V?) {
            [email protected](Optional(value))
        }

    }