/**
* 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.observable;
import io.reactivex.internal.functions.
ObjectHelper;
import java.util.*;
import java.util.concurrent.
Callable;
import io.reactivex.*;
import io.reactivex.
Observable;
import io.reactivex.
Observer;
import io.reactivex.disposables.
Disposable;
import io.reactivex.exceptions.
Exceptions;
import io.reactivex.internal.disposables.*;
import io.reactivex.internal.functions.
Functions;
import io.reactivex.internal.fuseable.
FuseToObservable;
import io.reactivex.plugins.
RxJavaPlugins;
public final class
ObservableToListSingle<T, U extends
Collection<? super T>>
extends
Single<U> implements
FuseToObservable<U> {
final
ObservableSource<T>
source;
final
Callable<U>
collectionSupplier;
@
SuppressWarnings({ "unchecked", "rawtypes" })
public
ObservableToListSingle(
ObservableSource<T>
source, final int
defaultCapacityHint) {
this.
source =
source;
this.
collectionSupplier = (
Callable)
Functions.
createArrayList(
defaultCapacityHint);
}
public
ObservableToListSingle(
ObservableSource<T>
source,
Callable<U>
collectionSupplier) {
this.
source =
source;
this.
collectionSupplier =
collectionSupplier;
}
@
Override
public void
subscribeActual(
SingleObserver<? super U>
t) {
U
coll;
try {
coll =
ObjectHelper.
requireNonNull(
collectionSupplier.
call(), "The collectionSupplier returned a null collection. Null values are generally not allowed in 2.x operators and sources.");
} catch (
Throwable e) {
Exceptions.
throwIfFatal(
e);
EmptyDisposable.
error(
e,
t);
return;
}
source.
subscribe(new
ToListObserver<T, U>(
t,
coll));
}
@
Override
public
Observable<U>
fuseToObservable() {
return
RxJavaPlugins.
onAssembly(new
ObservableToList<T, U>(
source,
collectionSupplier));
}
static final class
ToListObserver<T, U extends
Collection<? super T>> implements
Observer<T>,
Disposable {
final
SingleObserver<? super U>
downstream;
U
collection;
Disposable upstream;
ToListObserver(
SingleObserver<? super U>
actual, U
collection) {
this.
downstream =
actual;
this.
collection =
collection;
}
@
Override
public void
onSubscribe(
Disposable d) {
if (
DisposableHelper.
validate(this.
upstream,
d)) {
this.
upstream =
d;
downstream.
onSubscribe(this);
}
}
@
Override
public void
dispose() {
upstream.
dispose();
}
@
Override
public boolean
isDisposed() {
return
upstream.
isDisposed();
}
@
Override
public void
onNext(T
t) {
collection.
add(
t);
}
@
Override
public void
onError(
Throwable t) {
collection = null;
downstream.
onError(
t);
}
@
Override
public void
onComplete() {
U
c =
collection;
collection = null;
downstream.
onSuccess(
c);
}
}
}