com.github.davidmoten.rx.internal.operators.OnSubscribeFromQueue Maven / Gradle / Ivy

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package com.github.davidmoten.rx.internal.operators;

import java.util.Queue;

import rx.Observer;
import rx.observables.SyncOnSubscribe;

public class OnSubscribeFromQueue extends SyncOnSubscribe, T> {

    private final Queue queue;

    public OnSubscribeFromQueue(Queue queue) {
        this.queue = queue;
    }

    @Override
    protected Queue generateState() {
        return this.queue;
    }

    @Override
    protected Queue next(Queue queue, Observer observer) {
        T value = queue.poll();
        if (value == null) {
            observer.onCompleted();
        } else {
            observer.onNext(value);
        }
        return queue;
    }

}