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.util;

import org.reactivestreams.*;

import io.reactivex.*;
import io.reactivex.disposables.Disposable;
import io.reactivex.plugins.RxJavaPlugins;

Singleton implementing many interfaces as empty.
/**
 * Singleton implementing many interfaces as empty.
 */
public enum EmptyComponent implements FlowableSubscriber<Object>, Observer<Object>, MaybeObserver<Object>,
SingleObserver<Object>, CompletableObserver, Subscription, Disposable {
    INSTANCE;

    @SuppressWarnings("unchecked")
    public static <T> Subscriber<T> asSubscriber() {
        return (Subscriber<T>)INSTANCE;
    }

    @SuppressWarnings("unchecked")
    public static <T> Observer<T> asObserver() {
        return (Observer<T>)INSTANCE;
    }

    @Override
    public void dispose() {
        // deliberately no-op
    }

    @Override
    public boolean isDisposed() {
        return true;
    }

    @Override
    public void request(long n) {
        // deliberately no-op
    }

    @Override
    public void cancel() {
        // deliberately no-op
    }

    @Override
    public void onSubscribe(Disposable d) {
        d.dispose();
    }

    @Override
    public void onSubscribe(Subscription s) {
        s.cancel();
    }

    @Override
    public void onNext(Object t) {
        // deliberately no-op
    }

    @Override
    public void onError(Throwable t) {
        RxJavaPlugins.onError(t);
    }

    @Override
    public void onComplete() {
        // deliberately no-op
    }

    @Override
    public void onSuccess(Object value) {
        // deliberately no-op
    }
}