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CovarianceTest.java
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/**
* Copyright 2015 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 io.reactivex;
import static org.junit.Assert.assertEquals;
import java.util.*;
import java.util.function.Function;
import org.junit.Test;
import io.reactivex.Observable.Transformer;
import io.reactivex.subscribers.TestSubscriber;
/**
* Test super/extends of generics.
*
* See https://github.com/Netflix/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> fromIterable(new ArrayList<HorrorMovie>());
// Observable.<HorrorMovie>from(new Movie()); // may not compile
}
@Test
public void testSortedList() {
Comparator<Media> SORT_FUNCTION = (t1, t2) -> 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 testGroupByCompose() {
Observable<Movie> movies = Observable.just(new HorrorMovie(), new ActionMovie(), new Movie());
TestSubscriber<String> ts = new TestSubscriber<>();
movies
.groupBy(Object::getClass)
.doOnNext(g -> System.out.println(g.key()))
.flatMap(g ->
g
.doOnNext(System.out::println)
.compose(m -> m.concatWith(Observable.just(new ActionMovie()))
)
.map(Object::toString))
.subscribe(ts);
ts.assertTerminated();
ts.assertNoErrors();
// System.out.println(ts.getOnNextEvents());
assertEquals(6, ts.valueCount());
}
@SuppressWarnings("unused")
@Test
public void testCovarianceOfCompose() {
Observable<HorrorMovie> movie = Observable.just(new HorrorMovie());
Observable<Movie> movie2 = movie.compose(t -> Observable.just(new Movie()));
}
@SuppressWarnings("unused")
@Test
public void testCovarianceOfCompose2() {
Observable<Movie> movie = Observable.<Movie> just(new HorrorMovie());
Observable<HorrorMovie> movie2 = movie.compose(t -> Observable.just(new HorrorMovie()));
}
@SuppressWarnings("unused")
@Test
public void testCovarianceOfCompose3() {
Observable<Movie> movie = Observable.<Movie>just(new HorrorMovie());
Observable<HorrorMovie> movie2 = movie.compose(t ->
Observable.just(new HorrorMovie()).map(v -> v)
);
}
@SuppressWarnings("unused")
@Test
public void testCovarianceOfCompose4() {
Observable<HorrorMovie> movie = Observable.just(new HorrorMovie());
Observable<HorrorMovie> movie2 = movie.compose(t1 -> t1.map(v -> v));
}
@Test
public void testComposeWithDeltaLogic() {
List<Movie> list1 = Arrays.asList(new Movie(), new HorrorMovie(), new ActionMovie());
List<Movie> list2 = Arrays.asList(new ActionMovie(), new Movie(), new HorrorMovie(), new ActionMovie());
Observable<List<Movie>> movies = Observable.just(list1, list2);
movies.compose(deltaTransformer);
}
static Function<List<List<Movie>>, Observable<Movie>> calculateDelta = listOfLists -> {
if (listOfLists.size() == 1) {
return Observable.fromIterable(listOfLists.get(0));
} else {
// diff the two
List<Movie> newList = listOfLists.get(1);
List<Movie> oldList = new ArrayList<>(listOfLists.get(0));
Set<Movie> delta = new LinkedHashSet<>();
delta.addAll(newList);
// remove all that match in old
delta.removeAll(oldList);
// filter oldList to those that aren't in the newList
oldList.removeAll(newList);
// for all left in the oldList we'll create DROP events
for (@SuppressWarnings("unused") Movie old : oldList) {
delta.add(new Movie());
}
return Observable.fromIterable(delta);
}
};
static Transformer<List<Movie>, Movie> deltaTransformer = movieList -> {
return movieList
.startWith(new ArrayList<Movie>())
.buffer(2, 1)
.skip(1)
.flatMap(calculateDelta);
};
/*
* 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 {
}
}