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rxjava3-observable developed by David Karnok
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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.observable.internal.operators;
import io.reactivex.common.Disposable;
import io.reactivex.common.exceptions.Exceptions;
import io.reactivex.common.functions.Function;
import io.reactivex.common.internal.disposables.DisposableHelper;
import io.reactivex.common.internal.functions.ObjectHelper;
import io.reactivex.observable.*;
/**
* 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> actual;
final Function super T, ? extends R> mapper;
Disposable d;
MapMaybeObserver(MaybeObserver super R> actual, Function super T, ? extends R> mapper) {
this.actual = actual;
this.mapper = mapper;
}
@Override
public void dispose() {
Disposable d = this.d;
this.d = DisposableHelper.DISPOSED;
d.dispose();
}
@Override
public boolean isDisposed() {
return d.isDisposed();
}
@Override
public void onSubscribe(Disposable d) {
if (DisposableHelper.validate(this.d, d)) {
this.d = d;
actual.onSubscribe(this);
}
}
@Override
public void onSuccess(T value) {
R v;
try {
v = ObjectHelper.requireNonNull(mapper.apply(value), "The mapper returned a null item");
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
actual.onError(ex);
return;
}
actual.onSuccess(v);
}
@Override
public void onError(Throwable e) {
actual.onError(e);
}
@Override
public void onComplete() {
actual.onComplete();
}
}
}