run.smt.ktest.util.functional.Try.Try.kt Maven / Gradle / Ivy

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kTest utilities

There is a newer version: 1.0.0

package run.smt.ktest.util.functional.Try

fun  success(value: T): Try = Success(value)

sealed class Try(
    val value: T?,
    val exception: Throwable?
) {
    companion object {
        fun  of(f: () -> T): Try {
            return try {
                Success(f())
            } catch (e: Throwable) {
                Failure(e)
            }
        }
    }

    fun  map(mapper: (T) -> U): Try =
        value?.let(mapper)?.let { Success(it) }
            ?: Failure(exception ?: IllegalStateException())

    fun  flatMap(mapper: (T) -> Try): Try =
        value?.let(mapper) ?: Failure(exception ?: IllegalStateException())

    fun  mapTry(mapper: (T) -> U): Try = flatMap { of { mapper(it) } }
}

class Success internal constructor(value: T) : Try(value, null)
class Failure internal constructor(exception: Throwable) : Try(null, exception)