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rxjava3-observable developed by David Karnok

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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.observable.internal.operators;

import io.reactivex.common.Disposable;
import io.reactivex.common.internal.disposables.DisposableHelper;
import io.reactivex.observable.*;

/**
 * Hides the identity of the upstream Completable and its Disposable sent through onSubscribe.
 */
public final class CompletableHide extends Completable {

    final CompletableSource source;

    public CompletableHide(CompletableSource source) {
        this.source = source;
    }

    @Override
    protected void subscribeActual(CompletableObserver observer) {
        source.subscribe(new HideCompletableObserver(observer));
    }

    static final class HideCompletableObserver implements CompletableObserver, Disposable {

        final CompletableObserver actual;

        Disposable d;

        HideCompletableObserver(CompletableObserver actual) {
            this.actual = actual;
        }

        @Override
        public void dispose() {
            d.dispose();
            d = DisposableHelper.DISPOSED;
        }

        @Override
        public boolean isDisposed() {
            return d.isDisposed();
        }

        @Override
        public void onSubscribe(Disposable d) {
            if (DisposableHelper.validate(this.d, d)) {
                this.d = d;

                actual.onSubscribe(this);
            }
        }

        @Override
        public void onError(Throwable e) {
            actual.onError(e);
        }

        @Override
        public void onComplete() {
            actual.onComplete();
        }
    }
}