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Apache Commons Lang, a package of Java utility classes for the classes that are in java.lang's hierarchy, or are considered to be so standard as to justify existence in java.lang. The code is tested using the latest revision of the JDK for supported LTS releases: 8, 11, 17 and 21 currently. See https://github.com/apache/commons-lang/blob/master/.github/workflows/maven.yml Please ensure your build environment is up-to-date and kindly report any build issues.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.commons.lang3.function;

import java.util.Objects;
import java.util.function.Consumer;
import java.util.function.Function;

/**
 * A functional interface like {@link Consumer} that declares a {@link Throwable}.
 *
 * 
 * This is a functional interface whose functional method is {@link #accept(Object)}.
 * 
 *
 * @param  the type of the input to the operation
 * @param  Thrown exception type.
 * @since 3.11
 */
@FunctionalInterface
public interface FailableConsumer {

    /** NOP singleton */
    @SuppressWarnings("rawtypes")
    FailableConsumer NOP = Function.identity()::apply;

    /**
     * Returns The NOP singleton.
     *
     * @param  Consumed type 1.
     * @param  The kind of thrown exception or error.
     * @return The NOP singleton.
     */
    @SuppressWarnings("unchecked")
    static  FailableConsumer nop() {
        return NOP;
    }

    /**
     * Accepts the given arguments.
     *
     * @param object the parameter for the consumable to accept
     * @throws E Thrown when the consumer fails.
     */
    void accept(T object) throws E;

    /**
     * Returns a composed {@link Consumer} like {@link Consumer#andThen(Consumer)}.
     *
     * @param after the operation to perform after this operation
     * @return a composed {@link Consumer} like {@link Consumer#andThen(Consumer)}.
     * @throws NullPointerException when {@code after} is null
     */
    default FailableConsumer andThen(final FailableConsumer after) {
        Objects.requireNonNull(after);
        return (final T t) -> {
            accept(t);
            after.accept(t);
        };
    }
}