2 * ============LICENSE_START=======================================================
3 * dcaegen2-collectors-veshv
4 * ================================================================================
5 * Copyright (C) 2018 NOKIA
6 * ================================================================================
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 * ============LICENSE_END=========================================================
20 package org.onap.dcae.collectors.veshv.utils.arrow
22 import arrow.core.Either
23 import arrow.core.ForOption
24 import arrow.core.Option
26 import arrow.core.extensions.option.monad.monad
28 import arrow.core.identity
29 import arrow.syntax.collections.firstOption
30 import arrow.typeclasses.MonadContinuation
31 import reactor.core.publisher.Flux
32 import reactor.core.publisher.Mono
33 import java.util.concurrent.atomic.AtomicReference
36 * @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
41 fun <A> binding(c: suspend MonadContinuation<ForOption, *>.() -> A)
42 : Option<A> = Option.monad().binding(c).fix()
45 fun <A> Either<A, A>.flatten() = fold(::identity, ::identity)
47 fun <B> Either<Throwable, B>.rightOrThrow() = fold({ throw it }, ::identity)
49 fun <A, B> Either<A, B>.rightOrThrow(mapper: (A) -> Throwable) = fold({ throw mapper(it) }, ::identity)
51 fun <A : Exception, B> Flux<Either<A, B>>.throwOnLeft(): Flux<B> = map { it.rightOrThrow() }
53 fun <A, B> Flux<Either<A, B>>.throwOnLeft(f: (A) -> Exception): Flux<B> = map { it.rightOrThrow(f) }
55 fun <A, B> Mono<Either<A, B>>.throwOnLeft(f: (A) -> Exception): Mono<B> = map { it.rightOrThrow(f) }
57 fun <A> AtomicReference<A>.getOption() = Option.fromNullable(get())
59 fun <A> Option.Companion.fromNullablesChain(firstValue: A?, vararg nextValues: () -> A?): Option<A> =
60 if (firstValue != null)
61 Option.just(firstValue)
62 else nextValues.asSequence()
64 .filter { it != null }
68 fun <A, B> Either<A, B>.doOnLeft(action: () -> Unit): Either<A, B> = apply { if (isLeft()) action() }
70 fun <A> Option<A>.doOnEmpty(action: () -> Unit): Option<A> = apply { if (isEmpty()) action() }
72 fun <A> Try<A>.doOnFailure(action: (Throwable) -> Unit): Try<A> = apply {
73 if (this is Try.Failure) {
78 fun <A, B> A.mapBinding(c: suspend MonadContinuation<ForOption, *>.(A) -> B)
79 : Option<B> = let { OptionUtils.binding { c(it) } }