/**
* 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.
Observable.*;
import rx.
Subscriber;
import rx.exceptions.
Exceptions;
import rx.plugins.
RxJavaHooks;
/**
* Transforms the downstream Subscriber into a Subscriber via an operator
* callback and calls the parent OnSubscribe.call() method with it.
* @param <T> the source value type
* @param <R> the result value type
*/
public final class
OnSubscribeLift<T, R> implements
OnSubscribe<R> {
final
OnSubscribe<T>
parent;
final
Operator<? extends R, ? super T>
operator;
public
OnSubscribeLift(
OnSubscribe<T>
parent,
Operator<? extends R, ? super T>
operator) {
this.
parent =
parent;
this.
operator =
operator;
}
@
Override
public void
call(
Subscriber<? super R>
o) {
try {
Subscriber<? super T>
st =
RxJavaHooks.
onObservableLift(
operator).
call(
o);
try {
// new Subscriber created and being subscribed with so 'onStart' it
st.
onStart();
parent.
call(
st);
} catch (
Throwable e) {
// localized capture of errors rather than it skipping all operators
// and ending up in the try/catch of the subscribe method which then
// prevents onErrorResumeNext and other similar approaches to error handling
Exceptions.
throwIfFatal(
e);
st.
onError(
e);
}
} catch (
Throwable e) {
Exceptions.
throwIfFatal(
e);
// if the lift function failed all we can do is pass the error to the final Subscriber
// as we don't have the operator available to us
o.
onError(
e);
}
}
}