68 lines
2.6 KiB
Java
68 lines
2.6 KiB
Java
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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 input argument and returns no
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* result. Unlike most other functional interfaces, {@code Consumer} is expected
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* 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(Object)}.
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*
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* @param <T> the type of the input to the operation
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*
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* @since 1.8
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*/
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@FunctionalInterface
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public interface Consumer<T> {
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/**
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* Performs this operation on the given argument.
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*
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* @param t the input argument
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*/
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void accept(T t);
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/**
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* Returns a composed {@code Consumer} 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 Consumer} 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 Consumer<T> andThen(Consumer<? super T> after) {
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Objects.requireNonNull(after);
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return (T t) -> { accept(t); after.accept(t); };
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}
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}
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