73 lines
2.8 KiB
Java
73 lines
2.8 KiB
Java
/*
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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 a function that accepts two arguments and produces a result.
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* This is the two-arity specialization of {@link Function}.
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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 #apply(Object, Object)}.
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*
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* @param <T> the type of the first argument to the function
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* @param <U> the type of the second argument to the function
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* @param <R> the type of the result of the function
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*
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* @see Function
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* @since 1.8
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*/
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@FunctionalInterface
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public interface BiFunction<T, U, R> {
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/**
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* Applies this function to the given arguments.
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*
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* @param t the first function argument
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* @param u the second function argument
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* @return the function result
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*/
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R apply(T t, U u);
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/**
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* Returns a composed function that first applies this function to
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* its input, and then applies the {@code after} function to the result.
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* If evaluation of either function throws an exception, it is relayed to
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* the caller of the composed function.
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*
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* @param <V> the type of output of the {@code after} function, and of the
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* composed function
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* @param after the function to apply after this function is applied
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* @return a composed function that first applies this function and then
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* applies the {@code after} function
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* @throws NullPointerException if after is null
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*/
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default <V> BiFunction<T, U, V> andThen(Function<? super R, ? extends V> after) {
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Objects.requireNonNull(after);
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return (T t, U u) -> after.apply(apply(t, u));
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}
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}
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