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rxjava2-interop developed by David Karnok

There is a newer version: 0.13.7

/*
 * Copyright 2016 David Karnok
 *
 * 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.rxjava.interop;

/**
 * Wrap a 2.x FlowableProcessor into a 1.x Subject.
 * @param  the input and output value type
 * @since 0.9.0
 */
final class ProcessorV2ToSubjectV1 extends rx.subjects.Subject {

    static  rx.subjects.Subject createWith(io.reactivex.processors.FlowableProcessor processor) {
        State state = new State(processor);
        return new ProcessorV2ToSubjectV1(state);
    }

    final State state;

    private ProcessorV2ToSubjectV1(State state) {
        super(state);
        this.state = state;
    }

    @Override
    public void onNext(T t) {
        state.onNext(t);
    }

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

    @Override
    public void onCompleted() {
        state.onCompleted();
    }

    @Override
    public boolean hasObservers() {
        return state.hasObservers();
    }

    static final class State
    implements rx.Observable.OnSubscribe {

        final io.reactivex.processors.FlowableProcessor processor;

        State(io.reactivex.processors.FlowableProcessor processor) {
            this.processor = processor;
        }

        @Override
        public void call(rx.Subscriber t) {
            hu.akarnokd.rxjava.interop.FlowableV2ToObservableV1.SourceSubscriber parent =
                    new hu.akarnokd.rxjava.interop.FlowableV2ToObservableV1.SourceSubscriber(t);

            t.add(parent);
            t.setProducer(parent);

            processor.subscribe(parent);
        }

        void onNext(T t) {
            processor.onNext(t);
        }

        void onError(Throwable e) {
            processor.onError(e);
        }

        void onCompleted() {
            processor.onComplete();
        }

        boolean hasObservers() {
            return processor.hasSubscribers();
        }
    }
}