com.qbizm.kramerius.imptool.poc.utils.UUIDManager.java Source code

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Here is the source code for com.qbizm.kramerius.imptool.poc.utils.UUIDManager.java

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package com.qbizm.kramerius.imptool.poc.utils;

import java.util.regex.Pattern;

import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
import org.safehaus.uuid.EthernetAddress;
import org.safehaus.uuid.UUID;
import org.safehaus.uuid.UUIDGenerator;

import com.qbizm.kramerius.imptool.poc.valueobj.ServiceException;

import cz.incad.kramerius.utils.conf.KConfiguration;

/**
 * Class for working with uuid
 * <p>
 * Copyright (c) 2006 Qbizm technologies, a.s. All rights reserved.
 * <p>
 * This software is the proprietary information of Qbizm technologies, a.s. Use is subject to
 * license terms.
 * <p>
 * Requirements: <br>
 * Keywords: <br>
 * 
 * @author <A href="mailto:pavel.rotek@qbizm.cz">Pavel Rotek</a>
 * @version $Revision: 1.11 $ $Date: 2008/05/06 16:01:06 $
 */
public class UUIDManager {

    /** logger */
    private static final Logger log = Logger.getLogger(UUIDManager.class);

    private static Pattern pattern = Pattern
            .compile("^[a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12}$");

    /**
     * instance of uuid generator
     */
    private static UUIDGenerator uuidGenerator = UUIDGenerator.getInstance();

    /**
     * cached ethernet address of the server
     */
    private static EthernetAddress ea = null;

    static {
        String macAddress = KConfiguration.getInstance().getConfiguration().getString("uuid.mac");
        macAddress = macAddress.replaceAll("-", ":"); // pro jistotu
        if (StringUtils.isEmpty(macAddress)) {
            log.error("MAC address not set!");
        }
        ea = new EthernetAddress(macAddress);
    }

    /**
     * generate UUID version 2, type 1
     * 
     * @return uuid
     * @throws ServiceException
     */
    public static UUID generateUUID() throws ServiceException {
        if (ea != null) {
            return uuidGenerator.generateTimeBasedUUID(ea);
        } else {
            throw new ServiceException("No MAC address set, can't generate UUID!");
        }
    }

    /**
     * validate uuid string
     * 
     * @param uuid
     * @return true if uuid is valid uuid otherwise false
     */
    public static boolean validateUUID(String uuid) {
        if (StringUtils.trimToNull(uuid) == null)
            return false;
        return pattern.matcher(uuid).find();
    }
}