/**
* 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.maybe;
import java.util.concurrent.
Callable;
import io.reactivex.*;
import io.reactivex.disposables.*;
import io.reactivex.exceptions.
Exceptions;
import io.reactivex.plugins.
RxJavaPlugins;
/**
* Executes a callable and signals its value as success or signals an exception.
*
* @param <T> the value type
*/
public final class
MaybeFromCallable<T> extends
Maybe<T> implements
Callable<T> {
final
Callable<? extends T>
callable;
public
MaybeFromCallable(
Callable<? extends T>
callable) {
this.
callable =
callable;
}
@
Override
protected void
subscribeActual(
MaybeObserver<? super T>
observer) {
Disposable d =
Disposables.
empty();
observer.
onSubscribe(
d);
if (!
d.
isDisposed()) {
T
v;
try {
v =
callable.
call();
} catch (
Throwable ex) {
Exceptions.
throwIfFatal(
ex);
if (!
d.
isDisposed()) {
observer.
onError(
ex);
} else {
RxJavaPlugins.
onError(
ex);
}
return;
}
if (!
d.
isDisposed()) {
if (
v == null) {
observer.
onComplete();
} else {
observer.
onSuccess(
v);
}
}
}
}
@
Override
public T
call() throws
Exception {
return
callable.
call();
}
}