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=========================================================
21 @file:Suppress("TooManyFunctions")
23 package org.onap.dcae.collectors.veshv.utils.arrow
25 import arrow.core.Either
26 import arrow.core.ForOption
27 import arrow.core.Option
29 import arrow.core.extensions.option.monad.monad
31 import arrow.core.identity
32 import arrow.syntax.collections.firstOption
33 import arrow.typeclasses.MonadContinuation
34 import reactor.core.publisher.Flux
35 import reactor.core.publisher.Mono
36 import java.util.concurrent.atomic.AtomicReference
39 * @author Piotr Jaszczyk <piotr.jaszczyk@nokia.com>
45 fun <A> binding(c: suspend MonadContinuation<ForOption, *>.() -> A)
46 : Option<A> = Option.monad().binding(c).fix()
49 fun <A> Either<A, A>.flatten() = fold(::identity, ::identity)
51 fun <B> Either<Throwable, B>.rightOrThrow() = fold({ throw it }, ::identity)
53 fun <A, B> Either<A, B>.rightOrThrow(mapper: (A) -> Throwable) = fold({ throw mapper(it) }, ::identity)
55 fun <A : Exception, B> Flux<Either<A, B>>.throwOnLeft(): Flux<B> = map { it.rightOrThrow() }
57 fun <A, B> Flux<Either<A, B>>.throwOnLeft(f: (A) -> Exception): Flux<B> = map { it.rightOrThrow(f) }
59 fun <A, B> Mono<Either<A, B>>.throwOnLeft(f: (A) -> Exception): Mono<B> = map { it.rightOrThrow(f) }
61 fun <A> AtomicReference<A>.getOption() = Option.fromNullable(get())
63 fun <A> Option.Companion.fromNullablesChain(firstValue: A?, vararg nextValues: () -> A?): Option<A> =
64 if (firstValue != null)
65 Option.just(firstValue)
66 else nextValues.asSequence()
68 .filter { it != null }
72 fun <A, B> Either<A, B>.doOnLeft(action: () -> Unit): Either<A, B> = apply { if (isLeft()) action() }
74 fun <A> Option<A>.doOnEmpty(action: () -> Unit): Option<A> = apply { if (isEmpty()) action() }
76 fun <A> Try<A>.doOnFailure(action: (Throwable) -> Unit): Try<A> = apply {
77 if (this is Try.Failure) {
82 fun <A, B> A.mapBinding(c: suspend MonadContinuation<ForOption, *>.(A) -> B)
83 : Option<B> = let { OptionUtils.binding { c(it) } }
85 fun <T> Option<Boolean>.flatFold(ifEmptyOrFalse: () -> T, ifTrue: () -> T) =