common/kotlinx-coroutines-core-common/test/Try.kt

/*
 * 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 kotlinx.coroutines.experimental

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()
}