io.reactivex.internal.operators.flowable.FlowableFromIterable Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of rxjava Show documentation
Show all versions of rxjava Show documentation
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.flowable;
import java.util.Iterator;
import org.reactivestreams.Subscriber;
import io.reactivex.Flowable;
import io.reactivex.annotations.Nullable;
import io.reactivex.exceptions.Exceptions;
import io.reactivex.internal.functions.ObjectHelper;
import io.reactivex.internal.fuseable.ConditionalSubscriber;
import io.reactivex.internal.subscriptions.*;
import io.reactivex.internal.util.BackpressureHelper;
public final class FlowableFromIterable extends Flowable {
final Iterable source;
public FlowableFromIterable(Iterable source) {
this.source = source;
}
@Override
public void subscribeActual(Subscriber s) {
Iterator it;
try {
it = source.iterator();
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
EmptySubscription.error(e, s);
return;
}
subscribe(s, it);
}
public static void subscribe(Subscriber s, Iterator it) {
boolean hasNext;
try {
hasNext = it.hasNext();
} catch (Throwable e) {
Exceptions.throwIfFatal(e);
EmptySubscription.error(e, s);
return;
}
if (!hasNext) {
EmptySubscription.complete(s);
return;
}
if (s instanceof ConditionalSubscriber) {
s.onSubscribe(new IteratorConditionalSubscription(
(ConditionalSubscriber)s, it));
} else {
s.onSubscribe(new IteratorSubscription(s, it));
}
}
abstract static class BaseRangeSubscription extends BasicQueueSubscription {
private static final long serialVersionUID = -2252972430506210021L;
Iterator it;
volatile boolean cancelled;
boolean once;
BaseRangeSubscription(Iterator it) {
this.it = it;
}
@Override
public final int requestFusion(int mode) {
return mode & SYNC;
}
@Nullable
@Override
public final T poll() {
if (it == null) {
return null;
}
if (!once) {
once = true;
} else {
if (!it.hasNext()) {
return null;
}
}
return ObjectHelper.requireNonNull(it.next(), "Iterator.next() returned a null value");
}
@Override
public final boolean isEmpty() {
return it == null || !it.hasNext();
}
@Override
public final void clear() {
it = null;
}
@Override
public final void request(long n) {
if (SubscriptionHelper.validate(n)) {
if (BackpressureHelper.add(this, n) == 0L) {
if (n == Long.MAX_VALUE) {
fastPath();
} else {
slowPath(n);
}
}
}
}
@Override
public final void cancel() {
cancelled = true;
}
abstract void fastPath();
abstract void slowPath(long r);
}
static final class IteratorSubscription extends BaseRangeSubscription {
private static final long serialVersionUID = -6022804456014692607L;
final Subscriber downstream;
IteratorSubscription(Subscriber actual, Iterator it) {
super(it);
this.downstream = actual;
}
@Override
void fastPath() {
Iterator it = this.it;
Subscriber a = downstream;
for (;;) {
if (cancelled) {
return;
}
T t;
try {
t = it.next();
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
a.onError(ex);
return;
}
if (cancelled) {
return;
}
if (t == null) {
a.onError(new NullPointerException("Iterator.next() returned a null value"));
return;
} else {
a.onNext(t);
}
if (cancelled) {
return;
}
boolean b;
try {
b = it.hasNext();
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
a.onError(ex);
return;
}
if (!b) {
if (!cancelled) {
a.onComplete();
}
return;
}
}
}
@Override
void slowPath(long r) {
long e = 0L;
Iterator it = this.it;
Subscriber a = downstream;
for (;;) {
while (e != r) {
if (cancelled) {
return;
}
T t;
try {
t = it.next();
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
a.onError(ex);
return;
}
if (cancelled) {
return;
}
if (t == null) {
a.onError(new NullPointerException("Iterator.next() returned a null value"));
return;
} else {
a.onNext(t);
}
if (cancelled) {
return;
}
boolean b;
try {
b = it.hasNext();
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
a.onError(ex);
return;
}
if (!b) {
if (!cancelled) {
a.onComplete();
}
return;
}
e++;
}
r = get();
if (e == r) {
r = addAndGet(-e);
if (r == 0L) {
return;
}
e = 0L;
}
}
}
}
static final class IteratorConditionalSubscription extends BaseRangeSubscription {
private static final long serialVersionUID = -6022804456014692607L;
final ConditionalSubscriber downstream;
IteratorConditionalSubscription(ConditionalSubscriber actual, Iterator it) {
super(it);
this.downstream = actual;
}
@Override
void fastPath() {
Iterator it = this.it;
ConditionalSubscriber a = downstream;
for (;;) {
if (cancelled) {
return;
}
T t;
try {
t = it.next();
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
a.onError(ex);
return;
}
if (cancelled) {
return;
}
if (t == null) {
a.onError(new NullPointerException("Iterator.next() returned a null value"));
return;
} else {
a.tryOnNext(t);
}
if (cancelled) {
return;
}
boolean b;
try {
b = it.hasNext();
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
a.onError(ex);
return;
}
if (!b) {
if (!cancelled) {
a.onComplete();
}
return;
}
}
}
@Override
void slowPath(long r) {
long e = 0L;
Iterator it = this.it;
ConditionalSubscriber a = downstream;
for (;;) {
while (e != r) {
if (cancelled) {
return;
}
T t;
try {
t = it.next();
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
a.onError(ex);
return;
}
if (cancelled) {
return;
}
boolean b;
if (t == null) {
a.onError(new NullPointerException("Iterator.next() returned a null value"));
return;
} else {
b = a.tryOnNext(t);
}
if (cancelled) {
return;
}
boolean hasNext;
try {
hasNext = it.hasNext();
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
a.onError(ex);
return;
}
if (!hasNext) {
if (!cancelled) {
a.onComplete();
}
return;
}
if (b) {
e++;
}
}
r = get();
if (e == r) {
r = addAndGet(-e);
if (r == 0L) {
return;
}
e = 0L;
}
}
}
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy