| Line | Hits | Source |
|---|---|---|
| 1 | /******************************************************************************* | |
| 2 | *InternetCafe is a software solution that helps the management of Cybercafes | |
| 3 | * according with the ITALIAN DECREE LAW ON ANTI-TERROR MEASURES, 27 JULY 2005. | |
| 4 | * Copyright (C) 2006 Guido Angelo Ingenito | |
| 5 | ||
| 6 | * This program is free software; you can redistribute it and/or | |
| 7 | * modify it under the terms of the GNU General Public License | |
| 8 | * as published by the Free Software Foundation; either version 2 | |
| 9 | * of the License, or (at your option) any later version. | |
| 10 | ||
| 11 | * This program is distributed in the hope that it will be useful, | |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 14 | * GNU General Public License for more details. | |
| 15 | * | |
| 16 | * You should have received a copy of the GNU General Public License | |
| 17 | * along with this program; if not, write to the Free Software | |
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. | |
| 19 | *******************************************************************************/ | |
| 20 | package base.jdbs; | |
| 21 | ||
| 22 | import java.math.BigInteger; | |
| 23 | import java.security.SecureRandom; | |
| 24 | ||
| 25 | import org.apache.log4j.Logger; | |
| 26 | ||
| 27 | 0 | public class GUIDGenerator { |
| 28 | ||
| 29 | 0 | private static final transient Logger logger = Logger.getLogger(GUIDGenerator.class.getName()); |
| 30 | ||
| 31 | /**The secure random to use when must be build a global unique identifier.**/ | |
| 32 | private SecureRandom secureRandom; | |
| 33 | /**The GUIDGenerator instance according to the Singleton pattern.**/ | |
| 34 | 0 | private static GUIDGenerator instance = null; |
| 35 | ||
| 36 | ||
| 37 | /** | |
| 38 | * @return Returns the instance. | |
| 39 | */ | |
| 40 | public static GUIDGenerator getInstance(){ | |
| 41 | 0 | return instance!=null ? instance : (instance = new GUIDGenerator()); |
| 42 | } | |
| 43 | ||
| 44 | /** | |
| 45 | * The default constructor. | |
| 46 | */ | |
| 47 | 0 | protected GUIDGenerator(){ |
| 48 | 0 | this.secureRandom = new SecureRandom(); |
| 49 | 0 | logger.debug(secureRandom.getProvider().getInfo()); |
| 50 | 0 | } |
| 51 | ||
| 52 | /** | |
| 53 | * This method returns a alphanumeric key that is unique to a millisecond. The uniqueness | |
| 54 | * is increased by appending a random number to the key. | |
| 55 | * @return The unique key. | |
| 56 | */ | |
| 57 | public String getAlphanumericKey() { | |
| 58 | // Append current time in millis to a hexadecimal representation | |
| 59 | // of a random number. | |
| 60 | 0 | String key = "" + System.currentTimeMillis() + Long.toHexString(secureRandom.nextInt()); |
| 61 | 0 | logger.debug("getAlphanumericKey(): "+key); |
| 62 | 0 | return key; |
| 63 | } | |
| 64 | ||
| 65 | /** | |
| 66 | * This method returns a numeric key that is unique to a millisecond. The uniqueness | |
| 67 | * is increased by appending a random number to the key. | |
| 68 | * @return The unique key. | |
| 69 | */ | |
| 70 | public BigInteger getNumericKey() { | |
| 71 | // Append current time in millis to a hexadecimal representation | |
| 72 | // of a random number. | |
| 73 | 0 | String firstToken = ""+System.currentTimeMillis(); |
| 74 | 0 | Long secureToken = secureRandom.nextLong(); |
| 75 | 0 | String lastToken = secureToken > 0 ? ""+secureToken : ""+(-1 * secureToken); |
| 76 | 0 | BigInteger key = new BigInteger(firstToken+lastToken); |
| 77 | 0 | logger.debug("getNumericKey(): "+key); |
| 78 | 0 | return key; |
| 79 | } | |
| 80 | ||
| 81 | } |
|
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