Class UUIDHexGenerator

java.lang.Object

org.datanucleus.store.valuegenerator.AbstractGenerator<String>

org.datanucleus.store.valuegenerator.AbstractUUIDGenerator

org.datanucleus.store.valuegenerator.UUIDHexGenerator

All Implemented Interfaces:

ValueGenerator<String>

public class UUIDHexGenerator
extends AbstractUUIDGenerator

Value generator for a UUID hexadecimal format. Results in Strings of length 32 characters, containing the IP address of the local machine as per the JDO2 spec section 18.6.1.

Field Summary

Fields inherited from class AbstractUUIDGenerator

counter, IP_ADDRESS, JVM_UNIQUE

Fields inherited from class AbstractGenerator

allocationSize, block, initialValue, name, storeMgr

Fields inherited from interface ValueGenerator

PROPERTY_CATALOG_NAME, PROPERTY_CLASS_NAME, PROPERTY_COLUMN_NAME, PROPERTY_FIELD_NAME, PROPERTY_KEY_CACHE_SIZE, PROPERTY_KEY_DATABASE_CACHE_SIZE, PROPERTY_KEY_INITIAL_VALUE, PROPERTY_KEY_MAX_VALUE, PROPERTY_KEY_MIN_VALUE, PROPERTY_ROOT_CLASS_NAME, PROPERTY_SCHEMA_NAME, PROPERTY_SEQUENCE_NAME, PROPERTY_SEQUENCETABLE_CATALOG, PROPERTY_SEQUENCETABLE_NAME_COLUMN, PROPERTY_SEQUENCETABLE_NEXTVAL_COLUMN, PROPERTY_SEQUENCETABLE_SCHEMA, PROPERTY_SEQUENCETABLE_TABLE, PROPERTY_TABLE_NAME

Constructor Summary

Constructors

Constructor	Description
UUIDHexGenerator(StoreManager storeMgr, String name)	Constructor.

Method Summary

Modifier and Type	Method	Description
private static String	getHexFromInt(int val)	Utility to convert an int into a 8-char hex String
private static String	getHexFromShort(short val)	Utility to convert a short into a 4-char hex String
protected String	getIdentifier()	Create an identifier with the form "IIIIIIIIJJJJJJJJHHHHLLLLLLLLCCCC".
static Class	getStorageClass()	Accessor for the storage class for values generated with this generator.

Methods inherited from class AbstractUUIDGenerator

getCount, reserveBlock

Methods inherited from class AbstractGenerator

allocate, current, currentValue, getName, next, nextValue, obtainGenerationBlock, obtainGenerationBlock, reserveBlock

Methods inherited from class Object

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

Constructor Details

UUIDHexGenerator

public UUIDHexGenerator(StoreManager storeMgr,
 String name)

Constructor.

Parameters:

storeMgr - StoreManager

name - Symbolic name for this generator

Method Details

getStorageClass

public static Class getStorageClass()

Accessor for the storage class for values generated with this generator.

Returns:

Storage class (in this case String.class)

getIdentifier

protected String getIdentifier()

Create an identifier with the form "IIIIIIIIJJJJJJJJHHHHLLLLLLLLCCCC". Where IIIIIIII is the IP address, JJJJJJJJ is something unique across JVMs, HHHH is the High Time, LLLLLLLL is the low time, and CCCC is a count.

Specified by:

getIdentifier in class AbstractUUIDGenerator

Returns:

The identifier

getHexFromInt

private static String getHexFromInt(int val)

Utility to convert an int into a 8-char hex String

Parameters:

val - The int

Returns:

The hex String form of the int

getHexFromShort

private static String getHexFromShort(short val)

Utility to convert a short into a 4-char hex String

Parameters:

val - The short

Returns:

The hex String form of the short