com.knowgate.stringutils

Class Uid

java.lang.Object

com.knowgate.stringutils.Uid

public class Uid
extends Object

Functions for creating universal unique identifiers

Version:

1.0

Author:

Sergio Montoro Ten

Constructor Summary

Constructors

Constructor and Description
Uid()

Method Summary

Modifier and Type	Method and Description
static String	createTimeDependentKey() Create a universal unique key which increases over time
static String	createUniqueKey() Create a universal unique key for a new record
static String	generateRandomId(int iLength, String sCharset, byte byCategory) Generate a random identifier of a given length
static String	generateReverseTimestampId() Generate a reverse timestamp plus random int identifier of 32 characters length The identifier will be composed of Long.MAX_VALUE-Current Time in Milliseconds followed by a random 32 bits integer

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Uid

public Uid()

Method Detail

generateRandomId

public static String generateRandomId(int iLength,
                                      String sCharset,
                                      byte byCategory)
                               throws StringIndexOutOfBoundsException

Generate a random identifier of a given length

Parameters:

iLength - int Length of identifier to be generated /between 1 and 4096 characters)

sCharset - String Character set to be used for generating the identifier

byCategory - byte Character category, must be one of Character.UNASSIGNED, Character.UPPERCASE_LETTER or Character.LOWERCASE_LETTER If sCharset is null then it is "abcdefghjkmnpqrstuvwxyz23456789" by default

Returns:

Identifier of given length composed using the designated character set

Throws:

StringIndexOutOfBoundsException

createUniqueKey

public static String createUniqueKey()

Create a universal unique key for a new record

Returns:

String of 32 characters length

createTimeDependentKey

public static String createTimeDependentKey()

Create a universal unique key which increases over time

Returns:

String of 32 characters length

generateReverseTimestampId

public static String generateReverseTimestampId()

Generate a reverse timestamp plus random int identifier of 32 characters length The identifier will be composed of Long.MAX_VALUE-Current Time in Milliseconds followed by a random 32 bits integer

Returns:

Numeric identifier of 32 characters length padded with zeros at the left