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/**

* Copyright 2014 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 rx;

import org.junit.Test;

import rx.CovarianceTest.CoolRating;

import rx.CovarianceTest.ExtendedResult;

import rx.CovarianceTest.HorrorMovie;

import rx.CovarianceTest.Media;

import rx.CovarianceTest.Movie;

import rx.CovarianceTest.Rating;

import rx.CovarianceTest.Result;

import rx.functions.Action1;

import rx.functions.Func2;

import rx.subjects.BehaviorSubject;

import static org.junit.Assert.assertNull;

import static rx.Observable.combineLatest;

public class CombineLatestTests {

/**

* This won't compile if super/extends isn't done correctly on generics

*/

@Test

public void testCovarianceOfCombineLatest() {

Observable<HorrorMovie> horrors = Observable.just(new HorrorMovie());

Observable<CoolRating> ratings = Observable.just(new CoolRating());

Observable.<Movie, CoolRating, Result> combineLatest(horrors, ratings, combine).toBlocking().forEach(action);

Observable.<Movie, CoolRating, Result> combineLatest(horrors, ratings, combine).toBlocking().forEach(action);

Observable.<Media, Rating, ExtendedResult> combineLatest(horrors, ratings, combine).toBlocking().forEach(extendedAction);

Observable.<Media, Rating, Result> combineLatest(horrors, ratings, combine).toBlocking().forEach(action);

Observable.<Media, Rating, ExtendedResult> combineLatest(horrors, ratings, combine).toBlocking().forEach(action);

Observable.<Movie, CoolRating, Result> combineLatest(horrors, ratings, combine);

}

Func2<Media, Rating, ExtendedResult> combine = new Func2<Media, Rating, ExtendedResult>() {

@Override

public ExtendedResult call(Media m, Rating r) {

return new ExtendedResult();

}

};

Action1<Result> action = new Action1<Result>() {

@Override

public void call(Result t1) {

System.out.println("Result: " + t1);

}

};

Action1<ExtendedResult> extendedAction = new Action1<ExtendedResult>() {

@Override

public void call(ExtendedResult t1) {

System.out.println("Result: " + t1);

}

};

@Test

public void testNullEmitting() throws Exception {

Observable<Boolean> nullObservable = BehaviorSubject.create((Boolean) null);

Observable<Boolean> nonNullObservable = BehaviorSubject.create(true);

Observable<Boolean> combined =

combineLatest(nullObservable, nonNullObservable, new Func2<Boolean, Boolean, Boolean>() {

@Override

public Boolean call(Boolean bool1, Boolean bool2) {

return bool1 == null ? null : bool2;

}

});

combined.subscribe(new Action1<Boolean>() {

@Override

public void call(Boolean aBoolean) {

assertNull(aBoolean);

}

});

}

}