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java-design-patterns/function-composition/src/main/java/com/iluwatar/function/composition/FunctionComposer.java
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2025-04-12 16:11:03 +03:00

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Java

/*
* 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;
/**
* Class for composing functions using the Function Composition pattern. Provides a static method to
* compose two functions using the 'andThen' method.
*/
public class FunctionComposer {
private FunctionComposer() {}
/**
* Composes two functions where the output of the first function becomes the input of the second
* function.
*
* @param f1 the first function to apply
* @param f2 the second function to apply after the first
* @return a composed function that applies f1 and then f2
*/
public static Function<Integer, Integer> composeFunctions(
Function<Integer, Integer> f1, Function<Integer, Integer> f2) {
return f1.andThen(f2);
}
}