mutiny.zero.internal.IterablePublisher Maven / Gradle / Ivy

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package mutiny.zero.internal;

import static java.util.Objects.requireNonNull;

import org.reactivestreams.Publisher;
import org.reactivestreams.Subscriber;

public class IterablePublisher implements Publisher {

    private final Iterable iterable;

    public IterablePublisher(Iterable iterable) {
        this.iterable = iterable;
    }

    @Override
    public void subscribe(Subscriber subscriber) {
        requireNonNull(subscriber, "The subscriber cannot be null");
        if (!iterable.iterator().hasNext()) {
            subscriber.onSubscribe(new AlreadyCompletedSubscription());
            subscriber.onComplete();
        } else {
            subscriber.onSubscribe(new IteratorSubscription<>(iterable.iterator(), subscriber));
        }
    }

}