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 */ 017package org.apache.juneau.commons.function; 018 019import static org.apache.juneau.commons.utils.Shorts.*; 020 021 022/** 023 * A functional interface representing an operation that accepts three arguments and returns no result. 024 * 025 * <p> 026 * This interface extends the standard Java {@link java.util.function.Consumer} pattern to support 027 * three-argument consumers. It's useful when you need to pass operations with three parameters to methods 028 * that expect functional interfaces, such as in iteration, builders, or callback patterns. 029 * 030 * <h5 class='section'>Features:</h5> 031 * <ul class='spaced-list'> 032 * <li>Functional interface - can be used with lambda expressions and method references 033 * <li>Composition support - provides {@link #andThen(Consumer3)} for operation chaining 034 * <li>Side-effect operations - designed for operations that perform side effects rather than return values 035 * </ul> 036 * 037 * <h5 class='section'>Use Cases:</h5> 038 * <ul class='spaced-list'> 039 * <li>Three-argument operations in iteration patterns 040 * <li>Builder methods that accept three-parameter operations 041 * <li>Callback patterns with three parameters 042 * <li>Event handlers that process three values 043 * </ul> 044 * 045 * <h5 class='section'>Usage:</h5> 046 * <p class='bjava'> 047 * <jc>// Lambda expression</jc> 048 * Consumer3<String,Integer,Boolean> <jv>printer</jv> = (<jv>name</jv>, <jv>age</jv>, <jv>active</jv>) -> 049 * System.<jsf>out</jsf>.println(<jv>name</jv> + <js>" is "</js> + <jv>age</jv> + <js>" ("</js> + (<jv>active</jv> ? <js>"active"</js> : <js>"inactive"</js>) + <js>")"</js>); 050 * <jv>printer</jv>.apply(<js>"Alice"</js>, 30, <jk>true</jk>); <jc>// Prints "Alice is 30 (active)"</jc> 051 * 052 * <jc>// Operation composition</jc> 053 * Consumer3<String,Integer,Boolean> <jv>validate</jv> = (<jv>s</jv>, <jv>i</jv>, <jv>b</jv>) -> { 054 * <jk>if</jk> (<jv>i</jv> < 0) <jk>throw new</jk> IllegalArgumentException(); 055 * }; 056 * Consumer3<String,Integer,Boolean> <jv>process</jv> = (<jv>s</jv>, <jv>i</jv>, <jv>b</jv>) -> <jsm>process</jsm>(<jv>s</jv>, <jv>i</jv>, <jv>b</jv>); 057 * Consumer3<String,Integer,Boolean> <jv>validateAndProcess</jv> = <jv>validate</jv>.andThen(<jv>process</jv>); 058 * <jv>validateAndProcess</jv>.apply(<js>"data"</js>, 42, <jk>true</jk>); <jc>// Validates then processes</jc> 059 * </p> 060 * 061 * <h5 class='section'>See Also:</h5><ul> 062 * <li class='jc'>{@link Consumer2} - Two-argument consumer 063 * <li class='jc'>{@link Consumer4} - Four-argument consumer 064 * <li class='jc'>{@link Consumer5} - Five-argument consumer 065 * <li class='link'><a class="doclink" href="https://juneau.apache.org/docs/topics/JuneauCommons">juneau-commons</a> 066 * </ul> 067 * 068 * @param <A> The type of the first argument to the operation. 069 * @param <B> The type of the second argument to the operation. 070 * @param <C> The type of the third argument to the operation. 071 */ 072@FunctionalInterface 073@SuppressWarnings({ 074 "java:S1192" // Duplicated literals (argument/property names) read more clearly inline than as constants 075}) 076public interface Consumer3<A,B,C> { 077 078 /** 079 * Returns a composed {@link Consumer3} that performs, in sequence, this operation followed by the {@code after} operation. 080 * 081 * <p> 082 * This method enables operation composition, allowing you to chain multiple operations together. 083 * If performing either operation throws an exception, it is relayed to the caller of the composed operation. 084 * If performing this operation throws an exception, the {@code after} operation will not be performed. 085 * 086 * <h5 class='section'>Example:</h5> 087 * <p class='bjava'> 088 * Consumer3<String,Integer,Boolean> <jv>log</jv> = (<jv>s</jv>, <jv>i</jv>, <jv>b</jv>) -> <jsm>logger</jsm>.info(<jv>s</jv> + <js>": "</js> + <jv>i</jv> + <js>", "</js> + <jv>b</jv>); 089 * Consumer3<String,Integer,Boolean> <jv>store</jv> = (<jv>s</jv>, <jv>i</jv>, <jv>b</jv>) -> <jv>cache</jv>.put(<jv>s</jv>, <jv>i</jv>, <jv>b</jv>); 090 * Consumer3<String,Integer,Boolean> <jv>logAndStore</jv> = <jv>log</jv>.andThen(<jv>store</jv>); 091 * <jv>logAndStore</jv>.apply(<js>"data"</js>, 100, <jk>true</jk>); <jc>// Logs and stores</jc> 092 * </p> 093 * 094 * @param after The operation to perform after this operation. Must not be <jk>null</jk>. 095 * @return A composed {@link Consumer3} that performs in sequence this operation followed by the {@code after} operation. 096 * @throws NullPointerException if {@code after} is <jk>null</jk>. 097 */ 098 default Consumer3<A,B,C> andThen(Consumer3<? super A,? super B,? super C> after) { 099 reqnn("after", after); 100 return (A a, B b, C c) -> { 101 apply(a, b, c); 102 after.apply(a, b, c); 103 }; 104 } 105 106 /** 107 * Performs this operation on the given arguments. 108 * 109 * <h5 class='section'>Example:</h5> 110 * <p class='bjava'> 111 * Consumer3<String,Integer,Boolean> <jv>handler</jv> = (<jv>key</jv>, <jv>value</jv>, <jv>flag</jv>) -> { 112 * <jv>map</jv>.put(<jv>key</jv>, <jv>value</jv>); 113 * <jk>if</jk> (<jv>flag</jv>) <jv>cache</jv>.invalidate(<jv>key</jv>); 114 * }; 115 * <jv>handler</jv>.apply(<js>"user"</js>, 12345, <jk>true</jk>); 116 * </p> 117 * 118 * @param a The first operation argument. 119 * @param b The second operation argument. 120 * @param c The third operation argument. 121 */ 122 void apply(A a, B b, C c); 123}