/**
* 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 io.reactivex.*;
import io.reactivex.exceptions.
Exceptions;
import io.reactivex.internal.disposables.
EmptyDisposable;
import io.reactivex.internal.functions.
ObjectHelper;
/**
* Calls a MaybeOperator for the incoming MaybeObserver.
*
* @param <T> the upstream value type
* @param <R> the downstream value type
*/
public final class
MaybeLift<T, R> extends
AbstractMaybeWithUpstream<T, R> {
final
MaybeOperator<? extends R, ? super T>
operator;
public
MaybeLift(
MaybeSource<T>
source,
MaybeOperator<? extends R, ? super T>
operator) {
super(
source);
this.
operator =
operator;
}
@
Override
protected void
subscribeActual(
MaybeObserver<? super R>
observer) {
MaybeObserver<? super T>
lifted;
try {
lifted =
ObjectHelper.
requireNonNull(
operator.
apply(
observer), "The operator returned a null MaybeObserver");
} catch (
Throwable ex) {
Exceptions.
throwIfFatal(
ex);
EmptyDisposable.
error(
ex,
observer);
return;
}
source.
subscribe(
lifted);
}
}