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/**
* 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.Iterator;
import io.reactivex.*;
import io.reactivex.annotations.Nullable;
import io.reactivex.exceptions.Exceptions;
import io.reactivex.internal.disposables.EmptyDisposable;
import io.reactivex.internal.functions.ObjectHelper;
import io.reactivex.internal.observers.BasicQueueDisposable;
public final class ObservableFromIterable extends Observable {
final Iterable source;
public ObservableFromIterable(Iterable source) {
this.source = source;
}
@Override
public void subscribeActual(Observer observer) {
Iterator it;
try {
it = source.iterator();
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
EmptyDisposable.error(e, observer);
return;
}
boolean hasNext;
try {
hasNext = it.hasNext();
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
EmptyDisposable.error(e, observer);
return;
}
if (!hasNext) {
EmptyDisposable.complete(observer);
return;
}
FromIterableDisposable d = new FromIterableDisposable(observer, it);
observer.onSubscribe(d);
if (!d.fusionMode) {
d.run();
}
}
static final class FromIterableDisposable extends BasicQueueDisposable {
final Observer downstream;
final Iterator it;
volatile boolean disposed;
boolean fusionMode;
boolean done;
boolean checkNext;
FromIterableDisposable(Observer actual, Iterator it) {
this.downstream = actual;
this.it = it;
}
void run() {
boolean hasNext;
do {
if (isDisposed()) {
return;
}
T v;
try {
v = ObjectHelper.requireNonNull(it.next(), "The iterator returned a null value");
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
downstream.onError(e);
return;
}
downstream.onNext(v);
if (isDisposed()) {
return;
}
try {
hasNext = it.hasNext();
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
downstream.onError(e);
return;
}
} while (hasNext);
if (!isDisposed()) {
downstream.onComplete();
}
}
@Override
public int requestFusion(int mode) {
if ((mode & SYNC) != 0) {
fusionMode = true;
return SYNC;
}
return NONE;
}
@Nullable
@Override
public T poll() {
if (done) {
return null;
}
if (checkNext) {
if (!it.hasNext()) {
done = true;
return null;
}
} else {
checkNext = true;
}
return ObjectHelper.requireNonNull(it.next(), "The iterator returned a null value");
}
@Override
public boolean isEmpty() {
return done;
}
@Override
public void clear() {
done = true;
}
@Override
public void dispose() {
disposed = true;
}
@Override
public boolean isDisposed() {
return disposed;
}
}
}