    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.Objects;
    021import java.util.function.IntConsumer;
    022
    023/**
    024 * A functional interface like {@link IntConsumer} that declares a {@code Throwable}.
    025 *
    026 * @param <E> Thrown exception.
    027 * @since 3.11
    028 */
    029@FunctionalInterface
    030public interface FailableIntConsumer<E extends Throwable> {
    031
    032    /** NOP singleton */
    033    @SuppressWarnings("rawtypes")
    034    FailableIntConsumer NOP = t -> {/* NOP */};
    035
    036    /**
    037     * Returns The NOP singleton.
    038     *
    039     * @param <E> Thrown exception.
    040     * @return The NOP singleton.
    041     */
    042    static <E extends Throwable> FailableIntConsumer<E> nop() {
    043        return NOP;
    044    }
    045
    046    /**
    047     * Accepts the consumer.
    048     *
    049     * @param value the parameter for the consumable to accept
    050     * @throws E Thrown when the consumer fails.
    051     */
    052    void accept(int value) throws E;
    053
    054    /**
    055     * Returns a composed {@code FailableIntConsumer} like {@link IntConsumer#andThen(IntConsumer)}.
    056     *
    057     * @param after the operation to perform after this one.
    058     * @return a composed {@code FailableLongConsumer} like {@link IntConsumer#andThen(IntConsumer)}.
    059     * @throws NullPointerException if {@code after} is null
    060     */
    061    default FailableIntConsumer<E> andThen(final FailableIntConsumer<E> after) {
    062        Objects.requireNonNull(after);
    063        return (final int t) -> {
    064            accept(t);
    065            after.accept(t);
    066        };
    067    }
    068
    069}