https://github.com/ReactiveX/RxJava: Reactive Extensions for Java
  • David Karnok 
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.

/**
 * 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;

import io.reactivex.annotations.*;


Interface to map/wrap a downstream observer to an upstream observer.

Type parameters:
  • <Downstream> – the value type of the downstream
  • <Upstream> – the value type of the upstream
/**
 * Interface to map/wrap a downstream observer to an upstream observer.
 *
 * @param <Downstream> the value type of the downstream
 * @param <Upstream> the value type of the upstream
 */
public interface SingleOperator<Downstream, Upstream> {
    
Applies a function to the child SingleObserver and returns a new parent SingleObserver.

Params:
  • observer – the child SingleObserver instance
Throws:
Returns:the parent SingleObserver instance
/**
     * Applies a function to the child SingleObserver and returns a new parent SingleObserver.
     * @param observer the child SingleObserver instance
     * @return the parent SingleObserver instance
     * @throws Exception on failure
     */
    @NonNull
    SingleObserver<? super Upstream> apply(@NonNull SingleObserver<? super Downstream> observer) throws Exception;
}