| /* |
| * Copyright 2016-2017 JetBrains s.r.o. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package examples |
| |
| public class Try<out T> private constructor(private val _value: Any?) { |
| private class Fail(val exception: Throwable) { |
| override fun toString(): String = "Failure[$exception]" |
| } |
| |
| public companion object { |
| public operator fun <T> invoke(block: () -> T): Try<T> = |
| try { Success(block()) } catch(e: Throwable) { Failure<T>(e) } |
| public fun <T> Success(value: T) = Try<T>(value) |
| public fun <T> Failure(exception: Throwable) = Try<T>(Fail(exception)) |
| } |
| |
| @Suppress("UNCHECKED_CAST") |
| public val value: T get() = if (_value is Fail) throw _value.exception else _value as T |
| |
| public val exception: Throwable? get() = (_value as? Fail)?.exception |
| |
| override fun toString(): String = _value.toString() |
| } |