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saaj » com » sun » xml » messaging » saaj » packaging » mime » internet » UniqueValue.java
/*
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 * (the "License").  You may not use this file except
 * in compliance with the License.
 *
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 * https://jwsdp.dev.java.net/CDDLv1.0.html
 * See the License for the specific language governing
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 *
 * When distributing Covered Code, include this CDDL
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 * add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your
 * own identifying information: Portions Copyright [yyyy]
 * [name of copyright owner]
 */
/*
 * @(#)UniqueValue.java       1.6 02/03/27
 */

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
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 * The contents of this file are subject to the terms of either the GNU
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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
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package com.sun.xml.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() {
  StringBuffer s = new StringBuffer();

  // Unique string is ----=_Part_<part>_<hashcode>.<currentTime>
  s.append("----=_Part_").append(part++).append("_").
    append(s.hashCode()).append('.').
    append(System.currentTimeMillis());
  return s.toString();
    }
}
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