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.*;

Convenience interface and callback used by the Observable.as operator to turn an Observable into another value fluently. 
History: 2.1.7 - experimental
Type parameters:
<T> – the upstream type
<R> – the output type
Since:
2.2/**
 * Convenience interface and callback used by the {@link Observable#as} operator to turn an Observable into another
 * value fluently.
 * <p>History: 2.1.7 - experimental
 * @param <T> the upstream type
 * @param <R> the output type
 * @since 2.2
 */
public interface ObservableConverter<T, R> {
    
Applies a function to the upstream Observable and returns a converted value of type R. 
Params:
upstream – the upstream Observable instance
Returns:
the converted value/**
     * Applies a function to the upstream Observable and returns a converted value of type {@code R}.
     *
     * @param upstream the upstream Observable instance
     * @return the converted value
     */
    @NonNull
    R apply(@NonNull Observable<T> upstream);
}