function-composition/src/main/java/com/iluwatar/function/composition/App.java - master - githubmirror/java-design-patterns

function-composition/src/main/java/com/iluwatar/function/composition/App.java

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Ilkka Seppälä

docs: update function composition pattern

12 апр 2025, 16:11

12 апр 2025, 16:118ca487e

/*
 * This project is licensed under the MIT license. Module model-view-viewmodel is using ZK framework licensed under LGPL (see lgpl-3.0.txt).
 *
 * The MIT License
 * Copyright © 2014-2022 Ilkka Seppälä
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package com.iluwatar.function.composition;

import java.util.function.Function;
import lombok.extern.slf4j.Slf4j;

/** Main application class to demonstrate the use of function composition. */
@Slf4j
public class App {

  /**
   * Main method to demonstrate function composition using FunctionComposer.
   *
   * @param args command line arguments (not used)
   */
  public static void main(String[] args) {
    Function<Integer, Integer> timesTwo = x -> x * 2;
    Function<Integer, Integer> square = x -> x * x;

    Function<Integer, Integer> composedFunction =
        FunctionComposer.composeFunctions(timesTwo, square);

    int result = composedFunction.apply(3);
    LOGGER.info("Result of composing 'timesTwo' and 'square' functions applied to 3 is: " + result);
  }
}