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Reactive Extensions for Java
/**
* 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.observers;
import io.reactivex.Observer;
import io.reactivex.disposables.Disposable;
import io.reactivex.internal.disposables.DisposableHelper;
/**
* A fuseable Observer that can generate 0 or 1 resulting value.
* @param the input value type
* @param the output value type
*/
public abstract class DeferredScalarObserver
extends DeferredScalarDisposable
implements Observer {
private static final long serialVersionUID = -266195175408988651L;
/** The upstream disposable. */
protected Disposable upstream;
/**
* Creates a DeferredScalarObserver instance and wraps a downstream Observer.
* @param downstream the downstream subscriber, not null (not verified)
*/
public DeferredScalarObserver(Observer super R> downstream) {
super(downstream);
}
@Override
public void onSubscribe(Disposable d) {
if (DisposableHelper.validate(this.upstream, d)) {
this.upstream = d;
downstream.onSubscribe(this);
}
}
@Override
public void onError(Throwable t) {
value = null;
error(t);
}
@Override
public void onComplete() {
R v = value;
if (v != null) {
value = null;
complete(v);
} else {
complete();
}
}
@Override
public void dispose() {
super.dispose();
upstream.dispose();
}
}
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