/**
* 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 io.reactivex.*;
import io.reactivex.annotations.
Nullable;
import io.reactivex.internal.observers.
BasicIntQueueDisposable;
/**
* Emits a range of integer values from start to end.
*/
public final class
ObservableRange extends
Observable<
Integer> {
private final int
start;
private final long
end;
public
ObservableRange(int
start, int
count) {
this.
start =
start;
this.
end = (long)
start +
count;
}
@
Override
protected void
subscribeActual(
Observer<? super
Integer>
o) {
RangeDisposable parent = new
RangeDisposable(
o,
start,
end);
o.
onSubscribe(
parent);
parent.
run();
}
static final class
RangeDisposable
extends
BasicIntQueueDisposable<
Integer> {
private static final long
serialVersionUID = 396518478098735504L;
final
Observer<? super
Integer>
downstream;
final long
end;
long
index;
boolean
fused;
RangeDisposable(
Observer<? super
Integer>
actual, long
start, long
end) {
this.
downstream =
actual;
this.
index =
start;
this.
end =
end;
}
void
run() {
if (
fused) {
return;
}
Observer<? super
Integer>
actual = this.
downstream;
long
e =
end;
for (long
i =
index;
i !=
e &&
get() == 0;
i++) {
actual.
onNext((int)
i);
}
if (
get() == 0) {
lazySet(1);
actual.
onComplete();
}
}
@
Nullable
@
Override
public
Integer poll() throws
Exception {
long
i =
index;
if (
i !=
end) {
index =
i + 1;
return (int)
i;
}
lazySet(1);
return null;
}
@
Override
public boolean
isEmpty() {
return
index ==
end;
}
@
Override
public void
clear() {
index =
end;
lazySet(1);
}
@
Override
public void
dispose() {
set(1);
}
@
Override
public boolean
isDisposed() {
return
get() != 0;
}
@
Override
public int
requestFusion(int
mode) {
if ((
mode &
SYNC) != 0) {
fused = true;
return
SYNC;
}
return
NONE;
}
}
}