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/**
 * 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.*;
import org.reactivestreams.Subscriber;

/**
 * Interface to map/wrap a downstream subscriber to an upstream subscriber.
 *
 * @param  the value type of the downstream
 * @param  the value type of the upstream
 */
public interface FlowableOperator {
    /**
     * Applies a function to the child Subscriber and returns a new parent Subscriber.
     * @param subscriber the child Subscriber instance
     * @return the parent Subscriber instance
     * @throws Exception on failure
     */
    @NonNull
    Subscriber apply(@NonNull Subscriber subscriber) throws Exception;
}




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