rx.internal.operators.OperatorDoOnEach Maven / Gradle / Ivy
/**
* Copyright 2014 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 java.util.Arrays;
import rx.*;
import rx.Observable.Operator;
import rx.exceptions.*;
/**
* Converts the elements of an observable sequence to the specified type.
*/
public class OperatorDoOnEach implements Operator {
private final Observer doOnEachObserver;
public OperatorDoOnEach(Observer doOnEachObserver) {
this.doOnEachObserver = doOnEachObserver;
}
@Override
public Subscriber call(final Subscriber observer) {
return new Subscriber(observer) {
private boolean done = false;
@Override
public void onCompleted() {
if (done) {
return;
}
try {
doOnEachObserver.onCompleted();
} catch (Throwable e) {
Exceptions.throwOrReport(e, this);
return;
}
// Set `done` here so that the error in `doOnEachObserver.onCompleted()` can be noticed by observer
done = true;
observer.onCompleted();
}
@Override
public void onError(Throwable e) {
// need to throwIfFatal since we swallow errors after terminated
Exceptions.throwIfFatal(e);
if (done) {
return;
}
done = true;
try {
doOnEachObserver.onError(e);
} catch (Throwable e2) {
Exceptions.throwIfFatal(e2);
observer.onError(new CompositeException(Arrays.asList(e, e2)));
return;
}
observer.onError(e);
}
@Override
public void onNext(T value) {
if (done) {
return;
}
try {
doOnEachObserver.onNext(value);
} catch (Throwable e) {
Exceptions.throwOrReport(e, this, value);
return;
}
observer.onNext(value);
}
};
}
}