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Reactive Extensions for Java

There is a newer version: 2.2.8

/**
 * Copyright 2016 Netflix, Inc.
 *
 * 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.internal.observers;

import java.util.concurrent.atomic.AtomicReference;

import io.reactivex.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.exceptions.*;
import io.reactivex.functions.Consumer;
import io.reactivex.internal.disposables.DisposableHelper;
import io.reactivex.plugins.RxJavaPlugins;

public final class ToNotificationObserver
extends AtomicReference
implements Observer, Disposable {
    private static final long serialVersionUID = -7420197867343208289L;

    final Consumer> consumer;

    public ToNotificationObserver(Consumer> consumer) {
        this.consumer = consumer;
    }

    @Override
    public void onSubscribe(Disposable s) {
        DisposableHelper.setOnce(this, s);
    }

    @Override
    public void onNext(T t) {
        if (t == null) {
            get().dispose();
            onError(new NullPointerException("onNext called with null. Null values are generally not allowed in 2.x operators and sources."));
        } else {
            try {
                consumer.accept(Notification.