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.commons.io.function;
018
019import java.io.IOException;
020import java.util.Objects;
021import java.util.function.Function;
022
023/**
024 * Represents a function that accepts four arguments and produces a result. This is the four-arity specialization of
025 * {@link IOFunction}.
026 *
027 * <p>
028 * This is a <a href="package-summary.html">functional interface</a> whose functional method is
029 * {@link #apply(Object, Object, Object, Object)}.
030 * </p>
031 *
032 * @param <T> the type of the first argument to the function
033 * @param <U> the type of the second argument to the function
034 * @param <V> the type of the third argument to the function
035 * @param <W> the type of the fourth argument to the function
036 * @param <R> the type of the result of the function
037 *
038 * @see Function
039 * @since 2.12.0
040 */
041@FunctionalInterface
042public interface IOQuadFunction<T, U, V, W, R> {
043
044    /**
045     * Creates a composed function that first applies this function to its input, and then applies the {@code after}
046     * function to the result. If evaluation of either function throws an exception, it is relayed to the caller of the
047     * composed function.
048     *
049     * @param <X> the type of output of the {@code after} function, and of the composed function
050     * @param after the function to apply after this function is applied
051     * @return a composed function that first applies this function and then applies the {@code after} function
052     * @throws NullPointerException if after is null
053     */
054    default <X> IOQuadFunction<T, U, V, W, X> andThen(final IOFunction<? super R, ? extends X> after) {
055        Objects.requireNonNull(after);
056        return (final T t, final U u, final V v, final W w) -> after.apply(apply(t, u, v, w));
057    }
058
059    /**
060     * Applies this function to the given arguments.
061     *
062     * @param t the first function argument
063     * @param u the second function argument
064     * @param v the third function argument
065     * @param w the fourth function argument
066     * @return the function result
067     * @throws IOException if an I/O error occurs.
068     */
069    R apply(T t, U u, V v, W w) throws IOException;
070}