/* * Copyright (c) 1997, 2010, 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. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ /* * @(#)UniqueValue.java 1.6 02/03/27 */ package com.sun.xml.internal.messaging.saaj.packaging.mime.internet; /** * This is a utility class that generates unique values. The generated * String contains only US-ASCII characters and hence is safe for use * in RFC822 headers.
*
* This is a package private class.
*
* @author John Mani
* @author Max Spivak
* @author Bill Shannon
*/
class UniqueValue {
/**
* A global part number. Access is not synchronized because the
* value is only one part of the unique value and so doesn't need
* to be accurate.
*/
private static int part = 0;
/**
* Get a unique value for use in a multipart boundary string.
*
* This implementation generates it by concatenating a global
* part number, a newly created object's hashCode()
,
* and the current time (in milliseconds).
*/
public static String getUniqueBoundaryValue() {
StringBuffer s = new StringBuffer();
// Unique string is ----=_Part_