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 compose Observables.

Type parameters:
  • <Upstream> – the upstream value type
  • <Downstream> – the downstream value type
/**
 * Interface to compose Observables.
 *
 * @param <Upstream> the upstream value type
 * @param <Downstream> the downstream value type
 */
public interface ObservableTransformer<Upstream, Downstream> {
    
Applies a function to the upstream Observable and returns an ObservableSource with
optionally different element type.

Params:
  • upstream – the upstream Observable instance
Returns:the transformed ObservableSource instance
/**
     * Applies a function to the upstream Observable and returns an ObservableSource with
     * optionally different element type.
     * @param upstream the upstream Observable instance
     * @return the transformed ObservableSource instance
     */
    @NonNull
    ObservableSource<Downstream> apply(@NonNull Observable<Upstream> upstream);
}