/**
* 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.disposables.
Disposable;
import io.reactivex.exceptions.
Exceptions;
import io.reactivex.functions.
Function;
import io.reactivex.internal.disposables.
DisposableHelper;
import io.reactivex.internal.functions.
ObjectHelper;
/**
* Maps the upstream success value into some other value.
*
* @param <T> the upstream value type
* @param <R> the downstream value type
*/
public final class
MaybeMap<T, R> extends
AbstractMaybeWithUpstream<T, R> {
final
Function<? super T, ? extends R>
mapper;
public
MaybeMap(
MaybeSource<T>
source,
Function<? super T, ? extends R>
mapper) {
super(
source);
this.
mapper =
mapper;
}
@
Override
protected void
subscribeActual(
MaybeObserver<? super R>
observer) {
source.
subscribe(new
MapMaybeObserver<T, R>(
observer,
mapper));
}
static final class
MapMaybeObserver<T, R> implements
MaybeObserver<T>,
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 =
ObjectHelper.
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();
}
}
}