jdk/src/share/classes/java/util/function/LongConsumer.java
author mduigou
Tue, 23 Jul 2013 13:20:11 -0700
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8019840: Spec updates for java.util.function Reviewed-by: mduigou, chegar Contributed-by: brian.goetz@oracle.com
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/*
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 * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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package java.util.function;
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import java.util.Objects;
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/**
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 * Represents an operation that accepts a single {@code long}-valued argument and
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 * returns no result.  This is the primitive type specialization of
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 * {@link Consumer} for {@code long}.  Unlike most other functional interfaces,
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 * {@code LongConsumer} is expected to operate via side-effects.
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 *
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 * <p>This is a <a href="package-summary.html">functional interface</a>
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 * whose functional method is {@link #accept(long)}.
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 *
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 * @see Consumer
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 * @since 1.8
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 */
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@FunctionalInterface
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public interface LongConsumer {
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    /**
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     * Performs this operation on the given argument.
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     *
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     * @param value the input argument
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     */
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    void accept(long value);
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    /**
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     * Returns a composed {@code LongConsumer} that performs, in sequence, this
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     * operation followed by the {@code after} operation. If performing either
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     * operation throws an exception, it is relayed to the caller of the
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     * composed operation.  If performing this operation throws an exception,
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     * the {@code after} operation will not be performed.
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     *
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     * @param after the operation to perform after this operation
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     * @return a composed {@code LongConsumer} that performs in sequence this
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     * operation followed by the {@code after} operation
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     * @throws NullPointerException if {@code after} is null
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     */
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    default LongConsumer andThen(LongConsumer after) {
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        Objects.requireNonNull(after);
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        return (long t) -> { accept(t); after.accept(t); };
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    }
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}