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/*
* ============LICENSE_START=======================================================
* dcaegen2-collectors-veshv
* ================================================================================
* Copyright (C) 2018 NOKIA
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.dcae.collectors.veshv.utils.arrow
import arrow.core.Either
import arrow.core.Option
import arrow.core.identity
import arrow.syntax.collections.firstOption
import java.util.concurrent.atomic.AtomicReference
/**
* @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
* @since July 2018
*/
fun <A> Either<A, A>.flatten() = fold(::identity, ::identity)
fun <B> Either<Throwable, B>.rightOrThrow() = fold({ throw it }, ::identity)
fun <A, B> Either<A, B>.rightOrThrow(mapper: (A) -> Throwable) = fold({ throw mapper(it) }, ::identity)
fun <A> AtomicReference<A>.getOption() = Option.fromNullable(get())
fun <A> Option.Companion.fromNullablesChain(firstValue: A?, vararg nextValues: () -> A?): Option<A> =
if (firstValue != null)
Option.just(firstValue)
else nextValues.asSequence()
.map { it() }
.filter { it != null }
.firstOption()
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