src/main/java/org/apache/commons/lang3/function/FailableDoubleConsumer.java

/*
 * 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.DoubleConsumer;

/**
 * A functional interface like {@link DoubleConsumer} that declares a {@code Throwable}.
 *
 * @param <E> Thrown exception.
 * @since 3.11
 */
@FunctionalInterface
public interface FailableDoubleConsumer<E extends Throwable> {

    /** NOP singleton */
    @SuppressWarnings("rawtypes")
    FailableDoubleConsumer NOP = t -> {/* NOP */};

    /**
     * Returns The NOP singleton.
     *
     * @param <E> Thrown exception.
     * @return The NOP singleton.
     */
    static <E extends Throwable> FailableDoubleConsumer<E> nop() {
        return NOP;
    }

    /**
     * Accepts the consumer.
     *
     * @param value the parameter for the consumable to accept
     * @throws E Thrown when the consumer fails.
     */
    void accept(double value) throws E;

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