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Reactive Extensions for Java
/**
* Copyright (c) 2016-present, RxJava Contributors.
*
* 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.internal.operators.observable;
import java.util.List;
import java.util.concurrent.*;
import io.reactivex.*;
import io.reactivex.functions.*;
import io.reactivex.internal.functions.*;
import io.reactivex.observables.ConnectableObservable;
/**
* Helper utility class to support Observable with inner classes.
*/
public final class ObservableInternalHelper {
private ObservableInternalHelper() {
throw new IllegalStateException("No instances!");
}
static final class SimpleGenerator implements BiFunction, S> {
final Consumer> consumer;
SimpleGenerator(Consumer> consumer) {
this.consumer = consumer;
}
@Override
public S apply(S t1, Emitter t2) throws Exception {
consumer.accept(t2);
return t1;
}
}
public static BiFunction, S> simpleGenerator(Consumer> consumer) {
return new SimpleGenerator(consumer);
}
static final class SimpleBiGenerator implements BiFunction, S> {
final BiConsumer> consumer;
SimpleBiGenerator(BiConsumer> consumer) {
this.consumer = consumer;
}
@Override
public S apply(S t1, Emitter t2) throws Exception {
consumer.accept(t1, t2);
return t1;
}
}
public static BiFunction, S> simpleBiGenerator(BiConsumer> consumer) {
return new SimpleBiGenerator(consumer);
}
static final class ItemDelayFunction implements Function> {
final Function> itemDelay;
ItemDelayFunction(Function> itemDelay) {
this.itemDelay = itemDelay;
}
@Override
public ObservableSource apply(final T v) throws Exception {
ObservableSource o = ObjectHelper.requireNonNull(itemDelay.apply(v), "The itemDelay returned a null ObservableSource");
return new ObservableTake(o, 1).map(Functions.justFunction(v)).defaultIfEmpty(v);
}
}
public static Function> itemDelay(final Function> itemDelay) {
return new ItemDelayFunction(itemDelay);
}
static final class ObserverOnNext implements Consumer {
final Observer observer;
ObserverOnNext(Observer observer) {
this.observer = observer;
}
@Override
public void accept(T v) throws Exception {
observer.onNext(v);
}
}
static final class ObserverOnError implements Consumer {
final Observer observer;
ObserverOnError(Observer observer) {
this.observer = observer;
}
@Override
public void accept(Throwable v) throws Exception {
observer.onError(v);
}
}
static final class ObserverOnComplete implements Action {
final Observer observer;
ObserverOnComplete(Observer observer) {
this.observer = observer;
}
@Override
public void run() throws Exception {
observer.onComplete();
}
}
public static Consumer observerOnNext(Observer observer) {
return new ObserverOnNext(observer);
}
public static Consumer observerOnError(Observer observer) {
return new ObserverOnError(observer);
}
public static Action observerOnComplete(Observer observer) {
return new ObserverOnComplete(observer);
}
static final class FlatMapWithCombinerInner implements Function {
private final BiFunction combiner;
private final T t;
FlatMapWithCombinerInner(BiFunction combiner, T t) {
this.combiner = combiner;
this.t = t;
}
@Override
public R apply(U w) throws Exception {
return combiner.apply(t, w);
}
}
static final class FlatMapWithCombinerOuter implements Function> {
private final BiFunction combiner;
private final Function> mapper;
FlatMapWithCombinerOuter(BiFunction combiner,
Function> mapper) {
this.combiner = combiner;
this.mapper = mapper;
}
@Override
public ObservableSource apply(final T t) throws Exception {
@SuppressWarnings("unchecked")
ObservableSource u = (ObservableSource)ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null ObservableSource");
return new ObservableMap(u, new FlatMapWithCombinerInner(combiner, t));
}
}
public static Function> flatMapWithCombiner(
final Function> mapper,
final BiFunction combiner) {
return new FlatMapWithCombinerOuter(combiner, mapper);
}
static final class FlatMapIntoIterable implements Function> {
private final Function> mapper;
FlatMapIntoIterable(Function> mapper) {
this.mapper = mapper;
}
@Override
public ObservableSource apply(T t) throws Exception {
return new ObservableFromIterable(ObjectHelper.requireNonNull(mapper.apply(t), "The mapper returned a null Iterable"));
}
}
public static Function> flatMapIntoIterable(final Function> mapper) {
return new FlatMapIntoIterable(mapper);
}
enum MapToInt implements Function {
INSTANCE;
@Override
public Object apply(Object t) throws Exception {
return 0;
}
}
public static Callable> replayCallable(final Observable parent) {
return new ReplayCallable(parent);
}
public static Callable> replayCallable(final Observable parent, final int bufferSize) {
return new BufferedReplayCallable(parent, bufferSize);
}
public static Callable> replayCallable(final Observable parent, final int bufferSize, final long time, final TimeUnit unit, final Scheduler scheduler) {
return new BufferedTimedReplayCallable(parent, bufferSize, time, unit, scheduler);
}
public static Callable> replayCallable(final Observable parent, final long time, final TimeUnit unit, final Scheduler scheduler) {
return new TimedReplayCallable(parent, time, unit, scheduler);
}
public static Function, ObservableSource> replayFunction(final Function, ? extends ObservableSource> selector, final Scheduler scheduler) {
return new ReplayFunction(selector, scheduler);
}
static final class ZipIterableFunction
implements Function>, ObservableSource> {
private final Function zipper;
ZipIterableFunction(Function zipper) {
this.zipper = zipper;
}
@Override
public ObservableSource apply(List> list) {
return Observable.zipIterable(list, zipper, false, Observable.bufferSize());
}
}
public static Function>, ObservableSource> zipIterable(final Function zipper) {
return new ZipIterableFunction(zipper);
}
static final class ReplayCallable implements Callable> {
private final Observable parent;
ReplayCallable(Observable parent) {
this.parent = parent;
}
@Override
public ConnectableObservable call() {
return parent.replay();
}
}
static final class BufferedReplayCallable implements Callable> {
private final Observable parent;
private final int bufferSize;
BufferedReplayCallable(Observable parent, int bufferSize) {
this.parent = parent;
this.bufferSize = bufferSize;
}
@Override
public ConnectableObservable call() {
return parent.replay(bufferSize);
}
}
static final class BufferedTimedReplayCallable implements Callable> {
private final Observable parent;
private final int bufferSize;
private final long time;
private final TimeUnit unit;
private final Scheduler scheduler;
BufferedTimedReplayCallable(Observable parent, int bufferSize, long time, TimeUnit unit, Scheduler scheduler) {
this.parent = parent;
this.bufferSize = bufferSize;
this.time = time;
this.unit = unit;
this.scheduler = scheduler;
}
@Override
public ConnectableObservable call() {
return parent.replay(bufferSize, time, unit, scheduler);
}
}
static final class TimedReplayCallable implements Callable> {
private final Observable parent;
private final long time;
private final TimeUnit unit;
private final Scheduler scheduler;
TimedReplayCallable(Observable parent, long time, TimeUnit unit, Scheduler scheduler) {
this.parent = parent;
this.time = time;
this.unit = unit;
this.scheduler = scheduler;
}
@Override
public ConnectableObservable call() {
return parent.replay(time, unit, scheduler);
}
}
static final class ReplayFunction implements Function, ObservableSource> {
private final Function, ? extends ObservableSource> selector;
private final Scheduler scheduler;
ReplayFunction(Function, ? extends ObservableSource> selector, Scheduler scheduler) {
this.selector = selector;
this.scheduler = scheduler;
}
@Override
public ObservableSource apply(Observable t) throws Exception {
ObservableSource apply = ObjectHelper.requireNonNull(selector.apply(t), "The selector returned a null ObservableSource");
return Observable.wrap(apply).observeOn(scheduler);
}
}
}
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