rx.internal.operators.OnSubscribeTakeLastOne Maven / Gradle / Ivy
/**
* Copyright 2016 Netflix, Inc.
*
* 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 rx.internal.operators;
import rx.*;
import rx.Observable.OnSubscribe;
public final class OnSubscribeTakeLastOne implements OnSubscribe {
final Observable source;
public OnSubscribeTakeLastOne(Observable source) {
this.source = source;
}
@Override
public void call(Subscriber super T> t) {
new TakeLastOneSubscriber(t).subscribeTo(source);
}
static final class TakeLastOneSubscriber extends DeferredScalarSubscriber {
static final Object EMPTY = new Object();
@SuppressWarnings("unchecked")
public TakeLastOneSubscriber(Subscriber super T> actual) {
super(actual);
this.value = (T)EMPTY;
}
@Override
public void onNext(T t) {
value = t;
}
@SuppressWarnings("unchecked")
@Override
public void onCompleted() {
Object o = value;
if (o == EMPTY) {
complete();
} else {
complete((T)o);
}
}
}
}
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