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rxjava3-flowable developed by David Karnok
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/**
 * Copyright (c) 2016-present, RxJava Contributors.
 *
 * 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 io.reactivex.flowable.internal.operators;

import org.reactivestreams.*;

import hu.akarnokd.reactivestreams.extensions.RelaxedSubscriber;
import io.reactivex.common.RxJavaCommonPlugins;
import io.reactivex.common.exceptions.*;
import io.reactivex.common.functions.Function;
import io.reactivex.flowable.Flowable;
import io.reactivex.flowable.internal.subscriptions.SubscriptionArbiter;

public final class FlowableOnErrorNext extends AbstractFlowableWithUpstream {
    final Function> nextSupplier;
    final boolean allowFatal;

    public FlowableOnErrorNext(Flowable source,
            Function> nextSupplier, boolean allowFatal) {
        super(source);
        this.nextSupplier = nextSupplier;
        this.allowFatal = allowFatal;
    }

    @Override
    protected void subscribeActual(Subscriber s) {
        OnErrorNextSubscriber parent = new OnErrorNextSubscriber(s, nextSupplier, allowFatal);
        s.onSubscribe(parent.arbiter);
        source.subscribe(parent);
    }

    static final class OnErrorNextSubscriber implements RelaxedSubscriber {
        final Subscriber actual;
        final Function> nextSupplier;
        final boolean allowFatal;
        final SubscriptionArbiter arbiter;

        boolean once;

        boolean done;

        OnErrorNextSubscriber(Subscriber actual, Function> nextSupplier, boolean allowFatal) {
            this.actual = actual;
            this.nextSupplier = nextSupplier;
            this.allowFatal = allowFatal;
            this.arbiter = new SubscriptionArbiter();
        }

        @Override
        public void onSubscribe(Subscription s) {
            arbiter.setSubscription(s);
        }

        @Override
        public void onNext(T t) {
            if (done) {
                return;
            }
            actual.onNext(t);
            if (!once) {
                arbiter.produced(1L);
            }
        }

        @Override
        public void onError(Throwable t) {
            if (once) {
                if (done) {
                    RxJavaCommonPlugins.onError(t);
                    return;
                }
                actual.onError(t);
                return;
            }
            once = true;

            if (allowFatal && !(t instanceof Exception)) {
                actual.onError(t);
                return;
            }

            Publisher p;

            try {
                p = nextSupplier.apply(t);
            } catch (Throwable e) {
                Exceptions.throwIfFatal(e);
                actual.onError(new CompositeException(t, e));
                return;
            }

            if (p == null) {
                NullPointerException npe = new NullPointerException("Publisher is null");
                npe.initCause(t);
                actual.onError(npe);
                return;
            }

            p.subscribe(this);
        }

        @Override
        public void onComplete() {
            if (done) {
                return;
            }
            done = true;
            once = true;
            actual.onComplete();
        }
    }
}