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.
/**
 * 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.exceptions.*;
import io.reactivex.functions.Predicate;
import io.reactivex.internal.disposables.DisposableHelper;

Emits an onComplete if the source emits an onError and the predicate returns true for
that Throwable.
Type parameters:
<T> – the value type/**
 * Emits an onComplete if the source emits an onError and the predicate returns true for
 * that Throwable.
 * 
 * @param <T> the value type
 */
public final class MaybeOnErrorComplete<T> extends AbstractMaybeWithUpstream<T, T> {

    final Predicate<? super Throwable> predicate;

    public MaybeOnErrorComplete(MaybeSource<T> source,
            Predicate<? super Throwable> predicate) {
        super(source);
        this.predicate = predicate;
    }

    @Override
    protected void subscribeActual(MaybeObserver<? super T> observer) {
        source.subscribe(new OnErrorCompleteMaybeObserver<T>(observer, predicate));
    }

    static final class OnErrorCompleteMaybeObserver<T> implements MaybeObserver<T>, Disposable {

        final MaybeObserver<? super T> downstream;

        final Predicate<? super Throwable> predicate;

        Disposable upstream;

        OnErrorCompleteMaybeObserver(MaybeObserver<? super T> actual, Predicate<? super Throwable> predicate) {
            this.downstream = actual;
            this.predicate = predicate;
        }

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

                downstream.onSubscribe(this);
            }
        }

        @Override
        public void onSuccess(T value) {
            downstream.onSuccess(value);
        }

        @Override
        public void onError(Throwable e) {
            boolean b;

            try {
                b = predicate.test(e);
            } catch (Throwable ex) {
                Exceptions.throwIfFatal(ex);
                downstream.onError(new CompositeException(e, ex));
                return;
            }

            if (b) {
                downstream.onComplete();
            } else {
                downstream.onError(e);
            }
        }

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

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

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