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streamsupport is a backport of the Java 8 java.util.function (functional interfaces) and java.util.stream (streams) API for Java 6 / 7 and Android developers

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/*
 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
 * 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 java8.util.function;

import java8.util.function.Supplier;

/**
 * Represents a supplier of {@code long}-valued results.  This is the
 * {@code long}-producing primitive specialization of {@link Supplier}.
 *
 * There is no requirement that a distinct result be returned each
 * time the supplier is invoked.
 *
 * This is a functional interface
 * whose functional method is {@link #getAsLong()}.
 *
 * @see Supplier
 * @since 1.8
 */
public interface LongSupplier {

    /**
     * Gets a result.
     *
     * @return a result
     */
    long getAsLong();
}