/* * Copyright (c) 2005, John Mettraux, OpenWFE.org * All rights reserved. *  * Redistribution and use in source and binary forms, with or without  * modification, are permitted provided that the following conditions are met: *  * . Redistributions of source code must retain the above copyright notice, this *   list of conditions and the following disclaimer.   *  * . Redistributions in binary form must reproduce the above copyright notice,  *   this list of conditions and the following disclaimer in the documentation  *   and/or other materials provided with the distribution. *  * . Neither the name of the "OpenWFE" nor the names of its contributors may be *   used to endorse or promote products derived from this software without *   specific prior written permission. *  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE  * POSSIBILITY OF SUCH DAMAGE. * * $Id: UniqueIdGenerator.java,v 1.8 2005/05/17 16:40:14 jmettraux Exp $ *///// UniqueIdGenerator.java//// john.mettraux@openwfe.org//// generated with // jtmpl 1.1.00 16.08.2003 John Mettraux (jmettraux@openwfe.org)//package openwfe.org.misc;/** * A generator that you instantiate and then use as a utility instance. * * <p><font size=2>CVS Info : * <br>$Author: jmettraux $ * <br>$Id: UniqueIdGenerator.java,v 1.8 2005/05/17 16:40:14 jmettraux Exp $ </font> * * @author john.mettraux@openwfe.org */public class UniqueIdGenerator{    /*    private final static org.apache.log4j.Logger log = org.apache.log4j.Logger        .getLogger(UniqueIdGenerator.class.getName());    */    //    // CONSTANTS & co    public final static String P_ID_PREFIX        = "idPrefix";    protected static long lastGivenId = 0;    //    // FIELDS    protected int iPrefix = -1;    protected String sPrefix = null;    //    // CONSTRUCTORS    /**     * Instantiates a basic id generator : one that returns Long instances     * as ids     */    public UniqueIdGenerator ()    {        super();    }    /**     * the String prefix will always be prepended to the long ids     * generated, so you'll end up with a String uniqueId     */    public UniqueIdGenerator (String sPrefix)    {        super();        this.sPrefix = sPrefix;    }    public UniqueIdGenerator (int iPrefix)    {        super();        if (iPrefix < 10 || iPrefix > 99)        {            throw new RuntimeException                ("iPrefix must be comprised between 10 and 99 included");        }        this.iPrefix = iPrefix;    }    //    // METHODS    /**     * generates a unique id and prepares for generating the next one     */    public synchronized Object generateUniqueId ()    {        long id = System.currentTimeMillis();        if (id <= lastGivenId)        {            id = lastGivenId+1;        }        lastGivenId = id;        if (this.sPrefix != null)             return this.sPrefix + id;        if (this.iPrefix > 9)            return new Long(""+this.iPrefix+""+id);        return new Long(id);            // not returning directly lastGivenId...    }}