org.jetbrains.kotlin.fir.visitors.CompositeTransformResult.kt Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of kotlin-compiler Show documentation

Kotlin Compiler

There is a newer version: 2.0.0

/*
 * Copyright 2000-2018 JetBrains s.r.o. and Kotlin Programming Language contributors.
 * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
 */

package org.jetbrains.kotlin.fir.visitors

import org.jetbrains.kotlin.fir.FirElement

sealed class CompositeTransformResult {

    class Single(val _single: T) : CompositeTransformResult()

    class Multiple(val _list: List) : CompositeTransformResult()

    companion object {
        fun  empty() = Multiple(emptyList())
        fun  single(t: T) = Single(t)
        fun  many(l: List) = Multiple(l)
    }

    @Suppress("UNCHECKED_CAST")
    val list: List
        get() = when (this) {
            is Multiple<*> -> _list as List
            else -> error("!")
        }


    @Suppress("UNCHECKED_CAST")
    val single: T
        get() = when (this) {
            is Single<*> -> _single as T
            else -> error("!")
        }

    val isSingle
        get() = this is Single<*>

    val isEmpty
        get() = this is Multiple<*> && this.list.isEmpty()
}

@Suppress("NOTHING_TO_INLINE")
inline fun  T.compose() = CompositeTransformResult.single(this)