001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 018package org.apache.commons.lang3.function; 019 020import java.util.function.Function; 021 022/** 023 * Factory for {@link Function}. 024 * 025 * @since 3.14.0 026 */ 027public final class Functions { 028 029 /** 030 * Starts a fluent chain like {@code function(foo::bar).andThen(...).andThen(...).apply(...);} 031 * 032 * @param <T> Input type. 033 * @param <R> Return type. 034 * @param function the argument to return. 035 * @return the argument 036 */ 037 public static <T, R> Function<T, R> function(final Function<T, R> function) { 038 return function; 039 } 040 041 private Functions() { 042 // no instances needed. 043 } 044}