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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.internal.operators.maybe;

import io.reactivex.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.internal.disposables.DisposableHelper;
import io.reactivex.internal.fuseable.HasUpstreamMaybeSource;
import io.reactivex.internal.observers.DeferredScalarDisposable;

/**
 * Wraps a MaybeSource and exposes it as an Observable, relaying signals in a backpressure-aware manner
 * and composes cancellation through.
 *
 * @param  the value type
 */
public final class MaybeToObservable extends Observable implements HasUpstreamMaybeSource {

    final MaybeSource source;

    public MaybeToObservable(MaybeSource source) {
        this.source = source;
    }

    @Override
    public MaybeSource source() {
        return source;
    }

    @Override
    protected void subscribeActual(Observer observer) {
        source.subscribe(create(observer));
    }

    /**
     * Creates a {@link MaybeObserver} wrapper around a {@link Observer}.
     * 

History: 2.1.11 - experimental * @param the value type * @param downstream the downstream {@code Observer} to talk to * @return the new MaybeObserver instance * @since 2.2 */ public static MaybeObserver create(Observer downstream) { return new MaybeToObservableObserver(downstream); } static final class MaybeToObservableObserver extends DeferredScalarDisposable implements MaybeObserver { private static final long serialVersionUID = 7603343402964826922L; Disposable upstream; MaybeToObservableObserver(Observer downstream) { super(downstream); } @Override public void onSubscribe(Disposable d) { if (DisposableHelper.validate(this.upstream, d)) { this.upstream = d; downstream.onSubscribe(this); } } @Override public void onSuccess(T value) { complete(value); } @Override public void onError(Throwable e) { error(e); } @Override public void onComplete() { complete(); } @Override public void dispose() { super.dispose(); upstream.dispose(); } } }





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