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

public final class ObservableSingleMaybe extends Maybe {

    final ObservableSource source;

    public ObservableSingleMaybe(ObservableSource source) {
        this.source = source;
    }
    @Override
    public void subscribeActual(MaybeObserver t) {
        source.subscribe(new SingleElementObserver(t));
    }

    static final class SingleElementObserver implements Observer, Disposable {
        final MaybeObserver actual;

        Disposable s;

        T value;

        boolean done;

        SingleElementObserver(MaybeObserver actual) {
            this.actual = actual;
        }

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


        @Override
        public void dispose() {
            s.dispose();
        }

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


        @Override
        public void onNext(T t) {
            if (done) {
                return;
            }
            if (value != null) {
                done = true;
                s.dispose();
                actual.onError(new IllegalArgumentException("Sequence contains more than one element!"));
                return;
            }
            value = t;
        }

        @Override
        public void onError(Throwable t) {
            if (done) {
                RxJavaCommonPlugins.onError(t);
                return;
            }
            done = true;
            actual.onError(t);
        }

        @Override
        public void onComplete() {
            if (done) {
                return;
            }
            done = true;
            T v = value;
            value = null;
            if (v == null) {
                actual.onComplete();
            } else {
                actual.onSuccess(v);
            }
        }
    }
}