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97 lines (79 loc) · 2.47 KB
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/**
* 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 rx.*;
import rx.Observable.Operator;
import rx.exceptions.*;
import rx.plugins.RxJavaHooks;
/**
* Converts the elements of an observable sequence to the specified type.
* @param <T> the input value type
* @param <R> the output value type
*/
public class OperatorCast<T, R> implements Operator<R, T> {
final Class<R> castClass;
public OperatorCast(Class<R> castClass) {
this.castClass = castClass;
}
@Override
public Subscriber<? super T> call(final Subscriber<? super R> o) {
CastSubscriber<T, R> parent = new CastSubscriber<T, R>(o, castClass);
o.add(parent);
return parent;
}
static final class CastSubscriber<T, R> extends Subscriber<T> {
final Subscriber<? super R> actual;
final Class<R> castClass;
boolean done;
public CastSubscriber(Subscriber<? super R> actual, Class<R> castClass) {
this.actual = actual;
this.castClass = castClass;
}
@Override
public void onNext(T t) {
R result;
try {
result = castClass.cast(t);
} catch (Throwable ex) {
Exceptions.throwIfFatal(ex);
unsubscribe();
onError(OnErrorThrowable.addValueAsLastCause(ex, t));
return;
}
actual.onNext(result);
}
@Override
public void onError(Throwable e) {
if (done) {
RxJavaHooks.onError(e);
return;
}
done = true;
actual.onError(e);
}
@Override
public void onCompleted() {
if (done) {
return;
}
actual.onCompleted();
}
@Override
public void setProducer(Producer p) {
actual.setProducer(p);
}
}
}