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rxjava2-backport developed by David Karnok

There is a newer version: 2.0.0-RC3

/**
 * Copyright 2015 David Karnok and Netflix, Inc.
 * 
 * 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.rxjava2.internal.operators;

import java.util.concurrent.TimeUnit;

import org.reactivestreams.*;

import hu.akarnokd.rxjava2.Observable.Operator;
import hu.akarnokd.rxjava2.Scheduler;
import hu.akarnokd.rxjava2.schedulers.Timed;

public final class OperatorTimeInterval implements Operator, T> {
    final Scheduler scheduler;
    final TimeUnit unit;
    
    public OperatorTimeInterval(TimeUnit unit, Scheduler scheduler) {
        this.scheduler = scheduler;
        this.unit = unit;
    }
    
    @Override
    public Subscriber apply(Subscriber> t) {
        return new TimeIntervalSubscriber(t, unit, scheduler);
    }
    
    static final class TimeIntervalSubscriber implements Subscriber {
        final Subscriber> actual;
        final TimeUnit unit;
        final Scheduler scheduler;
        
        long lastTime;
        
        public TimeIntervalSubscriber(Subscriber> actual, TimeUnit unit, Scheduler scheduler) {
            this.actual = actual;
            this.scheduler = scheduler;
            this.unit = unit;
        }
        
        @Override
        public void onSubscribe(Subscription s) {
            lastTime = scheduler.now(unit);
            actual.onSubscribe(s);
        }
        
        @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();
        }
    }
}