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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.Exceptions;
import io.reactivex.common.functions.Predicate;
import io.reactivex.flowable.Flowable;
import io.reactivex.flowable.internal.subscriptions.SubscriptionHelper;

public final class FlowableTakeWhile extends AbstractFlowableWithUpstream {
    final Predicate predicate;
    public FlowableTakeWhile(Flowable source, Predicate predicate) {
        super(source);
        this.predicate = predicate;
    }

    @Override
    protected void subscribeActual(Subscriber s) {
        source.subscribe(new TakeWhileSubscriber(s, predicate));
    }

    static final class TakeWhileSubscriber implements RelaxedSubscriber, Subscription {
        final Subscriber actual;
        final Predicate predicate;

        Subscription s;

        boolean done;

        TakeWhileSubscriber(Subscriber actual, Predicate predicate) {
            this.actual = actual;
            this.predicate = predicate;
        }

        @Override
        public void onSubscribe(Subscription s) {
            if (SubscriptionHelper.validate(this.s, s)) {
                this.s = s;
                actual.onSubscribe(this);
            }
        }

        @Override
        public void onNext(T t) {
            if (done) {
                return;
            }
            boolean b;
            try {
                b = predicate.test(t);
            } catch (Throwable e) {
                Exceptions.throwIfFatal(e);
                s.cancel();
                onError(e);
                return;
            }

            if (!b) {
                done = true;
                s.cancel();
                actual.onComplete();
                return;
            }

            actual.onNext(t);
        }

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

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

        @Override
        public void request(long n) {
            s.request(n);
        }

        @Override
        public void cancel() {
            s.cancel();
        }
    }
}