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CovarianceTest.java
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120 lines (94 loc) · 3.21 KB
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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 java.util.ArrayList;
import org.junit.Test;
import rx.Observable.Transformer;
import rx.functions.Func2;
/**
* Test super/extends of generics.
*
* See https://github.com/ReactiveX/RxJava/pull/331
*/
public class CovarianceTest {
/**
* This won't compile if super/extends isn't done correctly on generics
*/
@Test
public void testCovarianceOfFrom() {
Observable.<Movie> just(new HorrorMovie());
Observable.<Movie> from(new ArrayList<HorrorMovie>());
// Observable.<HorrorMovie>from(new Movie()); // may not compile
}
@Test
public void testSortedList() {
Func2<Media, Media, Integer> SORT_FUNCTION = new Func2<Media, Media, Integer>() {
@Override
public Integer call(Media t1, Media t2) {
return 1;
}
};
// this one would work without the covariance generics
Observable<Media> o = Observable.just(new Movie(), new TVSeason(), new Album());
o.toSortedList(SORT_FUNCTION);
// this one would NOT work without the covariance generics
Observable<Movie> o2 = Observable.just(new Movie(), new ActionMovie(), new HorrorMovie());
o2.toSortedList(SORT_FUNCTION);
}
@Test
public void testCovarianceOfCompose() {
Observable<HorrorMovie> movie = Observable.<HorrorMovie> from(new HorrorMovie());
Observable<Movie> movie2 = movie.compose(new Transformer<Movie, Movie>() {
@Override
public Observable<Movie> call(Observable<? extends Movie> t1) {
return Observable.from(new Movie());
}
});
}
@Test
public void testCovarianceOfCompose2() {
Observable<Movie> movie = Observable.<Movie> from(new HorrorMovie());
Observable<HorrorMovie> movie2 = movie.compose(new Transformer<Movie, HorrorMovie>() {
@Override
public Observable<HorrorMovie> call(Observable<? extends Movie> t1) {
return Observable.from(new HorrorMovie());
}
});
}
/*
* Most tests are moved into their applicable classes such as [Operator]Tests.java
*/
static class Media {
}
static class Movie extends Media {
}
static class HorrorMovie extends Movie {
}
static class ActionMovie extends Movie {
}
static class Album extends Media {
}
static class TVSeason extends Media {
}
static class Rating {
}
static class CoolRating extends Rating {
}
static class Result {
}
static class ExtendedResult extends Result {
}
}