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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 static org.junit.Assert.assertEquals;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.LinkedHashSet;

import java.util.List;

import java.util.Set;

import org.junit.Test;

import rx.Observable.Transformer;

import rx.functions.Func1;

import rx.functions.Func2;

import rx.observables.GroupedObservable;

import rx.observers.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> 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 testGroupByCompose() {

Observable<Movie> movies = Observable.just(new HorrorMovie(), new ActionMovie(), new Movie());

TestSubscriber<String> ts = new TestSubscriber<String>();

movies.groupBy(new Func1<Movie, Class<? extends Movie>>() {

@Override

public Class<? extends Movie> call(Movie m) {

return m.getClass();

}

}).flatMap(new Func1<GroupedObservable<Class<? extends Movie>, Movie>, Observable<String>>() {

@Override

public Observable<String> call(GroupedObservable<Class<? extends Movie>, Movie> g) {

return g.compose(new Transformer<Movie, Movie>() {

@Override

public Observable<Movie> call(Observable<Movie> m) {

return m.concatWith(Observable.just(new ActionMovie()));

}

}).map(new Func1<Movie, String>() {

@Override

public String call(Movie m) {

return m.toString();

}

});

}

}).subscribe(ts);

ts.assertTerminalEvent();

ts.assertNoErrors();

// System.out.println(ts.getOnNextEvents());

assertEquals(6, ts.getOnNextEvents().size());

}

@SuppressWarnings("unused")

@Test

public void testCovarianceOfCompose() {

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

Observable<Movie> movie2 = movie.compose(new Transformer<Movie, Movie>() {

@Override

public Observable<Movie> call(Observable<Movie> t1) {

return Observable.just(new Movie());

}

});

}

@SuppressWarnings("unused")

@Test

public void testCovarianceOfCompose2() {

Observable<Movie> movie = Observable.<Movie> just(new HorrorMovie());

Observable<HorrorMovie> movie2 = movie.compose(new Transformer<Movie, HorrorMovie>() {

@Override

public Observable<HorrorMovie> call(Observable<Movie> t1) {

return Observable.just(new HorrorMovie());

}

});

}

@SuppressWarnings("unused")

@Test

public void testCovarianceOfCompose3() {

Observable<Movie> movie = Observable.<Movie>just(new HorrorMovie());

Observable<HorrorMovie> movie2 = movie.compose(new Transformer<Movie, HorrorMovie>() {

@Override

public Observable<HorrorMovie> call(Observable<Movie> t1) {

return Observable.just(new HorrorMovie()).map(new Func1<HorrorMovie, HorrorMovie>() {

@Override

public HorrorMovie call(HorrorMovie horrorMovie) {

return horrorMovie;

}

});

}

});

}

@SuppressWarnings("unused")

@Test

public void testCovarianceOfCompose4() {

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

Observable<HorrorMovie> movie2 = movie.compose(new Transformer<HorrorMovie, HorrorMovie>() {

@Override

public Observable<HorrorMovie> call(Observable<HorrorMovie> t1) {

return t1.map(new Func1<HorrorMovie, HorrorMovie>() {

@Override

public HorrorMovie call(HorrorMovie horrorMovie) {

return horrorMovie;

}

});

}

});

}

@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 Transformer<List<Movie>, Movie> deltaTransformer = new Transformer<List<Movie>, Movie>() {

@Override

public Observable<Movie> call(Observable<List<Movie>> movieList) {

return movieList

.startWith(new ArrayList<Movie>())

.buffer(2, 1)

.skip(1)

.flatMap(calculateDelta);

}

};

static Func1<List<List<Movie>>, Observable<Movie>> calculateDelta = new Func1<List<List<Movie>>, Observable<Movie>>() {

public Observable<Movie> call(List<List<Movie>> listOfLists) {

if (listOfLists.size() == 1) {

return Observable.from(listOfLists.get(0));

} else {

// diff the two

List<Movie> newList = listOfLists.get(1);

List<Movie> oldList = new ArrayList<Movie>(listOfLists.get(0));

Set<Movie> delta = new LinkedHashSet<Movie>();

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.from(delta);

}

}

};

/*

* 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 {

}

}