hu.akarnokd.rxjava2.internal.operators.nbp.NbpOnSubscribeDelaySubscriptionOther Maven / Gradle / Ivy

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rxjava2-backport developed by David Karnok
There is a newer version: 2.0.0-RC3
/**
 * Copyright 2015 David Karnok and 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 hu.akarnokd.rxjava2.internal.operators.nbp;

import hu.akarnokd.rxjava2.NbpObservable;
import hu.akarnokd.rxjava2.NbpObservable.*;
import hu.akarnokd.rxjava2.disposables.*;
import hu.akarnokd.rxjava2.plugins.RxJavaPlugins;

/**
 * Delays the subscription to the main source until the other
 * observable fires an event or completes.
 * @param  the main type
 * @param  the other value type, ignored
 */
public final class NbpOnSubscribeDelaySubscriptionOther implements NbpOnSubscribe {
    final NbpObservable main;
    final NbpObservable other;
    
    public NbpOnSubscribeDelaySubscriptionOther(NbpObservable main, NbpObservable other) {
        this.main = main;
        this.other = other;
    }
    
    @Override
    public void accept(final NbpSubscriber child) {
        final SerialDisposable serial = new SerialDisposable();
        child.onSubscribe(serial);
        
        NbpSubscriber otherSubscriber = new NbpSubscriber() {
            boolean done;
            @Override
            public void onSubscribe(Disposable d) {
                serial.set(d);
            }
            
            @Override
            public void onNext(U t) {
                onComplete();
            }
            
            @Override
            public void onError(Throwable e) {
                if (done) {
                    RxJavaPlugins.onError(e);
                    return;
                }
                done = true;
                child.onError(e);
            }
            
            @Override
            public void onComplete() {
                if (done) {
                    return;
                }
                done = true;
                
                main.unsafeSubscribe(new NbpSubscriber() {
                    @Override
                    public void onSubscribe(Disposable d) {
                        serial.set(d);
                    }
                    
                    @Override
                    public void onNext(T value) {
                        child.onNext(value);
                    }
                    
                    @Override
                    public void onError(Throwable e) {
                        child.onError(e);
                    }
                    
                    @Override
                    public void onComplete() {
                        child.onComplete();
                    }
                });
            }
        };
        
        other.unsafeSubscribe(otherSubscriber);
    }
}