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/*
* 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.rxjava3.internal.operators.maybe;
import io.reactivex.rxjava3.core.*;
import io.reactivex.rxjava3.disposables.Disposable;
import io.reactivex.rxjava3.exceptions.Exceptions;
import io.reactivex.rxjava3.functions.Function;
import io.reactivex.rxjava3.internal.disposables.DisposableHelper;
import java.util.Objects;
/**
* Maps the upstream success value into some other value.
*
* @param the upstream value type
* @param the downstream value type
*/
public final class MaybeMap extends AbstractMaybeWithUpstream {
final Function super T, ? extends R> mapper;
public MaybeMap(MaybeSource source, Function super T, ? extends R> mapper) {
super(source);
this.mapper = mapper;
}
@Override
protected void subscribeActual(MaybeObserver super R> observer) {
source.subscribe(new MapMaybeObserver(observer, mapper));
}
static final class MapMaybeObserver implements MaybeObserver, Disposable {
final MaybeObserver super R> downstream;
final Function super T, ? extends R> mapper;
Disposable upstream;
MapMaybeObserver(MaybeObserver super R> actual, Function super T, ? extends R> mapper) {
this.downstream = actual;
this.mapper = mapper;
}
@Override
public void dispose() {
Disposable d = this.upstream;
this.upstream = DisposableHelper.DISPOSED;
d.dispose();
}
@Override
public boolean isDisposed() {
return upstream.isDisposed();
}
@Override
public void onSubscribe(Disposable d) {
if (DisposableHelper.validate(this.upstream, d)) {
this.upstream = d;
downstream.onSubscribe(this);
}
}
@Override
public void onSuccess(T value) {
R v;
try {
v = Objects.requireNonNull(mapper.apply(value), "The mapper returned a null item");
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
downstream.onError(ex);
return;
}
downstream.onSuccess(v);
}
@Override
public void onError(Throwable e) {
downstream.onError(e);
}
@Override
public void onComplete() {
downstream.onComplete();
}
}
}
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