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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.internal.operators.flowable;

import java.util.concurrent.TimeUnit;

import org.reactivestreams.*;

import io.reactivex.*;
import io.reactivex.internal.subscriptions.SubscriptionHelper;
import io.reactivex.schedulers.Timed;

public final class FlowableTimeInterval extends AbstractFlowableWithUpstream> {
    final Scheduler scheduler;
    final TimeUnit unit;

    public FlowableTimeInterval(Flowable source, TimeUnit unit, Scheduler scheduler) {
        super(source);
        this.scheduler = scheduler;
        this.unit = unit;
    }


    @Override
    protected void subscribeActual(Subscriber> s) {
        source.subscribe(new TimeIntervalSubscriber(s, unit, scheduler));
    }

    static final class TimeIntervalSubscriber implements FlowableSubscriber, Subscription {
        final Subscriber> actual;
        final TimeUnit unit;
        final Scheduler scheduler;

        Subscription s;

        long lastTime;

        TimeIntervalSubscriber(Subscriber> actual, TimeUnit unit, Scheduler scheduler) {
            this.actual = actual;
            this.scheduler = scheduler;
            this.unit = unit;
        }

        @Override
        public void onSubscribe(Subscription s) {
            if (SubscriptionHelper.validate(this.s, s)) {
                lastTime = scheduler.now(unit);
                this.s = s;
                actual.onSubscribe(this);
            }
        }

        @Override
        public void onNext(T t) {
            long now = scheduler.now(unit);
            long last = lastTime;
            lastTime = now;
            long delta = now - last;
            actual.onNext(new Timed(t, delta, unit));
        }

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

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

        @Override
        public void request(long n) {
            s.request(n);
        }

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