Get a long integer from the byte buffer. - Java java.nio

Java examples for java.nio:ByteBuffer Int

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Description

Get a long integer from the byte buffer.

Demo Code

/* vim:set softtabstop=3 shiftwidth=3 tabstop=3 expandtab tw=72:
    $Id$//from   www. j a  va  2  s.  c  o m

    BufferUtil: static methods for reading from a ByteBuffer.
    Copyright (C) 2003  Casey Marshall <rsdio@metastatic.org>

    This file is a part of Jarsync.

    Jarsync is free software; you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    Jarsync 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 for more details.

    You should have received a copy of the GNU General Public License
    along with Jarsync; if not, write to the

       Free Software Foundation, Inc.,
       59 Temple Place, Suite 330,
       Boston, MA  02111-1307
       USA  */
//package com.java2s;

import java.nio.BufferUnderflowException;
import java.nio.ByteBuffer;

public class Main {
    /**
     * Get a long integer from the byte buffer. The semantics of the
     * integer read are as follows:
     *
     * <ul>
     * <li>If the first four bytes do not equal the integer
     * <tt>0xFFFFFFFF</tt>, return these four bytes, and don't read
     * anything else.</li>
     * <li>Otherwise, read eight more bytes and return that as the long
     * integer.</li>
     * </ul>
     *
     * @param in The input buffer.
     * @return The long integer.
     * @throws BufferUnderflowException If there are not enough bytes in
     *   the buffer.
     */
    public static long getLong(ByteBuffer in) {
        int i = in.getInt();
        if (i != 0xFFFFFFFF)
            return i;
        try {
            return in.getLong();
        } catch (BufferUnderflowException bue) {
            in.position(in.position() - 4);
            throw bue;
        }
    }
}

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