    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 *      https://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.io.function;
    019
    020import java.io.IOException;
    021import java.io.UncheckedIOException;
    022import java.util.Objects;
    023import java.util.function.BiConsumer;
    024
    025/**
    026 * Like {@link BiConsumer} but throws {@link IOException}.
    027 *
    028 * @param <T> the type of the first argument to the operation
    029 * @param <U> the type of the second argument to the operation
    030 * @see BiConsumer
    031 * @since 2.12.0
    032 */
    033@FunctionalInterface
    034public interface IOBiConsumer<T, U> {
    035
    036    /**
    037     * Returns the no-op singleton.
    038     *
    039     * @param <T> the type of the first argument to the operation
    040     * @param <U> the type of the second argument to the operation
    041     * @return The no-op singleton.
    042     */
    043    @SuppressWarnings("unchecked")
    044    static <T, U> IOBiConsumer<T, U> noop() {
    045        return Constants.IO_BI_CONSUMER;
    046    }
    047
    048    /**
    049     * Performs this operation on the given arguments.
    050     *
    051     * @param t the first input argument
    052     * @param u the second input argument
    053     * @throws IOException if an I/O error occurs.
    054     */
    055    void accept(T t, U u) throws IOException;
    056
    057    /**
    058     * Creates a composed {@link IOBiConsumer} that performs, in sequence, this operation followed by the {@code after}
    059     * operation. If performing either operation throws an exception, it is relayed to the caller of the composed operation.
    060     * If performing this operation throws an exception, the {@code after} operation will not be performed.
    061     *
    062     * @param after the operation to perform after this operation
    063     * @return a composed {@link IOBiConsumer} that performs in sequence this operation followed by the {@code after}
    064     *         operation
    065     * @throws NullPointerException if {@code after} is null
    066     */
    067    default IOBiConsumer<T, U> andThen(final IOBiConsumer<? super T, ? super U> after) {
    068        Objects.requireNonNull(after);
    069        return (t, u) -> {
    070            accept(t, u);
    071            after.accept(t, u);
    072        };
    073    }
    074
    075    /**
    076     * Creates a {@link BiConsumer} for this instance that throws {@link UncheckedIOException} instead of
    077     * {@link IOException}.
    078     *
    079     * @return an UncheckedIOException BiConsumer.
    080     * @throws UncheckedIOException Wraps an {@link IOException}.
    081     * @since 2.12.0
    082     */
    083    default BiConsumer<T, U> asBiConsumer() {
    084        return (t, u) -> Uncheck.accept(this, t, u);
    085    }
    086
    087}