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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.flowable;
import org.reactivestreams.Subscriber;
import io.reactivex.Flowable;
import io.reactivex.annotations.Nullable;
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 FlowableFromArray extends Flowable {
final T[] array;
public FlowableFromArray(T[] array) {
this.array = array;
}
@Override
public void subscribeActual(Subscriber s) {
if (s instanceof ConditionalSubscriber) {
s.onSubscribe(new ArrayConditionalSubscription(
(ConditionalSubscriber)s, array));
} else {
s.onSubscribe(new ArraySubscription(s, array));
}
}
abstract static class BaseArraySubscription extends BasicQueueSubscription {
private static final long serialVersionUID = -2252972430506210021L;
final T[] array;
int index;
volatile boolean cancelled;
BaseArraySubscription(T[] array) {
this.array = array;
}
@Override
public final int requestFusion(int mode) {
return mode & SYNC;
}
@Nullable
@Override
public final T poll() {
int i = index;
T[] arr = array;
if (i == arr.length) {
return null;
}
index = i + 1;
return ObjectHelper.requireNonNull(arr[i], "array element is null");
}
@Override
public final boolean isEmpty() {
return index == array.length;
}
@Override
public final void clear() {
index = array.length;
}
@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 ArraySubscription extends BaseArraySubscription {
private static final long serialVersionUID = 2587302975077663557L;
final Subscriber downstream;
ArraySubscription(Subscriber actual, T[] array) {
super(array);
this.downstream = actual;
}
@Override
void fastPath() {
T[] arr = array;
int f = arr.length;
Subscriber a = downstream;
for (int i = index; i != f; i++) {
if (cancelled) {
return;
}
T t = arr[i];
if (t == null) {
a.onError(new NullPointerException("The element at index " + i + " is null"));
return;
} else {
a.onNext(t);
}
}
if (cancelled) {
return;
}
a.onComplete();
}
@Override
void slowPath(long r) {
long e = 0;
T[] arr = array;
int f = arr.length;
int i = index;
Subscriber a = downstream;
for (;;) {
while (e != r && i != f) {
if (cancelled) {
return;
}
T t = arr[i];
if (t == null) {
a.onError(new NullPointerException("The element at index " + i + " is null"));
return;
} else {
a.onNext(t);
}
e++;
i++;
}
if (i == f) {
if (!cancelled) {
a.onComplete();
}
return;
}
r = get();
if (e == r) {
index = i;
r = addAndGet(-e);
if (r == 0L) {
return;
}
e = 0L;
}
}
}
}
static final class ArrayConditionalSubscription extends BaseArraySubscription {
private static final long serialVersionUID = 2587302975077663557L;
final ConditionalSubscriber downstream;
ArrayConditionalSubscription(ConditionalSubscriber actual, T[] array) {
super(array);
this.downstream = actual;
}
@Override
void fastPath() {
T[] arr = array;
int f = arr.length;
ConditionalSubscriber a = downstream;
for (int i = index; i != f; i++) {
if (cancelled) {
return;
}
T t = arr[i];
if (t == null) {
a.onError(new NullPointerException("The element at index " + i + " is null"));
return;
} else {
a.tryOnNext(t);
}
}
if (cancelled) {
return;
}
a.onComplete();
}
@Override
void slowPath(long r) {
long e = 0;
T[] arr = array;
int f = arr.length;
int i = index;
ConditionalSubscriber a = downstream;
for (;;) {
while (e != r && i != f) {
if (cancelled) {
return;
}
T t = arr[i];
if (t == null) {
a.onError(new NullPointerException("The element at index " + i + " is null"));
return;
} else {
if (a.tryOnNext(t)) {
e++;
}
i++;
}
}
if (i == f) {
if (!cancelled) {
a.onComplete();
}
return;
}
r = get();
if (e == r) {
index = i;
r = addAndGet(-e);
if (r == 0L) {
return;
}
e = 0L;
}
}
}
}
}