storm-client/src/jvm/org/apache/storm/streams/operations/Function.java

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.  The ASF licenses this file to you 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 org.apache.storm.streams.operations;

/**
 * Represents a function that accepts one argument and produces a result.
 *
 * @param <T> the type of the input to the function
 * @param <R> the type of the result of the function
 */
public interface Function<T, R> extends Operation {
    /**
     * Applies this function to the given argument.
     *
     * @param input the input to the function
     * @return the function result
     */
    R apply(T input);
}