/**
* 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.
Observable.
Operator;
import rx.
Subscriber;
import rx.functions.
Action0;
import rx.observers.
Subscribers;
/**
* This operator modifies an {@link rx.Observable} so a given action is invoked when the {@link rx.Observable} is subscribed.
* @param <T> The type of the elements in the {@link rx.Observable} that this operator modifies
*/
public class
OperatorDoOnSubscribe<T> implements
Operator<T, T> {
private final
Action0 subscribe;
/**
* Constructs an instance of the operator with the callback that gets invoked when the modified Observable is subscribed
* @param subscribe the action that gets invoked when the modified {@link rx.Observable} is subscribed
*/
public
OperatorDoOnSubscribe(
Action0 subscribe) {
this.
subscribe =
subscribe;
}
@
Override
public
Subscriber<? super T>
call(final
Subscriber<? super T>
child) {
subscribe.
call();
// Pass through since this operator is for notification only, there is
// no change to the stream whatsoever.
return
Subscribers.
wrap(
child);
}
}