| /* |
| * Copyright (c) 1997, 2012, 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. <p> |
| * |
| * 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 <code>hashCode()</code>, |
| * and the current time (in milliseconds). |
| */ |
| public static String getUniqueBoundaryValue() { |
| StringBuilder s = new StringBuilder(); |
| |
| // Unique string is ----=_Part_<part>_<hashcode>.<currentTime> |
| s.append("----=_Part_").append(part++).append("_"). |
| append(s.hashCode()).append('.'). |
| append(System.currentTimeMillis()); |
| return s.toString(); |
| } |
| } |