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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.single;
import java.util.*;
import java.util.concurrent.Callable;
import org.reactivestreams.Publisher;
import io.reactivex.*;
import io.reactivex.Observable;
import io.reactivex.functions.Function;
/**
* Helper utility class to support Single with inner classes.
*/
public final class SingleInternalHelper {
/** Utility class. */
private SingleInternalHelper() {
throw new IllegalStateException("No instances!");
}
enum NoSuchElementCallable implements Callable {
INSTANCE;
@Override
public NoSuchElementException call() throws Exception {
return new NoSuchElementException();
}
}
public static Callable emptyThrower() {
return NoSuchElementCallable.INSTANCE;
}
@SuppressWarnings("rawtypes")
enum ToFlowable implements Function {
INSTANCE;
@SuppressWarnings("unchecked")
@Override
public Publisher apply(SingleSource v) {
return new SingleToFlowable(v);
}
}
@SuppressWarnings({ "rawtypes", "unchecked" })
public static Function, Publisher extends T>> toFlowable() {
return (Function)ToFlowable.INSTANCE;
}
static final class ToFlowableIterator implements Iterator> {
private final Iterator extends SingleSource extends T>> sit;
ToFlowableIterator(Iterator extends SingleSource extends T>> sit) {
this.sit = sit;
}
@Override
public boolean hasNext() {
return sit.hasNext();
}
@Override
public Flowable next() {
return new SingleToFlowable(sit.next());
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}
static final class ToFlowableIterable implements Iterable> {
private final Iterable extends SingleSource extends T>> sources;
ToFlowableIterable(Iterable extends SingleSource extends T>> sources) {
this.sources = sources;
}
@Override
public Iterator> iterator() {
return new ToFlowableIterator(sources.iterator());
}
}
public static Iterable extends Flowable> iterableToFlowable(final Iterable extends SingleSource extends T>> sources) {
return new ToFlowableIterable(sources);
}
@SuppressWarnings("rawtypes")
enum ToObservable implements Function {
INSTANCE;
@SuppressWarnings("unchecked")
@Override
public Observable apply(SingleSource v) {
return new SingleToObservable(v);
}
}
@SuppressWarnings({ "rawtypes", "unchecked" })
public static Function, Observable extends T>> toObservable() {
return (Function)ToObservable.INSTANCE;
}
}
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