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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

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package java.util.function;

import java.util.Objects;

/**

 * Represents an operation that accepts a single input argument and returns no

 * result. Unlike most other functional interfaces, {@code Consumer} is expected

 * to operate via side-effects.

 *

 * <p>This is a <a href="package-summary.html">functional interface</a>

 * whose functional method is {@link #accept(Object)}.

 *

 * @param <T> the type of the input to the operation

 *

 * @since 1.8

 */

@FunctionalInterface

public interface Consumer<T> {

    /**

     * Performs this operation on the given argument.

     *

     * @param t the input argument

     */

    void accept(T t);

    /**

     * Returns a composed {@code Consumer} that performs, in sequence, this

     * operation followed by the {@code after} operation. If performing either

     * operation throws an exception, it is relayed to the caller of the

     * composed operation.  If performing this operation throws an exception,

     * the {@code after} operation will not be performed.

     *

     * @param after the operation to perform after this operation

     * @return a composed {@code Consumer} that performs in sequence this

     * operation followed by the {@code after} operation

     * @throws NullPointerException if {@code after} is null

     */

    default Consumer<T> andThen(Consumer<? super T> after) {

        Objects.requireNonNull(after);

        return (T t) -> { accept(t); after.accept(t); };

    }

}