org.hibernate.id

Class UUIDGenerator

java.lang.Object

org.hibernate.id.UUIDGenerator

All Implemented Interfaces:

Configurable, IdentifierGenerator

public class UUIDGenerator
extends Object
implements IdentifierGenerator, Configurable

An IdentifierGenerator which generates UUID values using a pluggable generation strategy. The values this generator can return include UUID, String and byte[16]

Supports 2 config parameters:

• UUID_GEN_STRATEGY - names the UUIDGenerationStrategy instance to use
• UUID_GEN_STRATEGY_CLASS - names the UUIDGenerationStrategy class to use

Currently there are 2 standard implementations of UUIDGenerationStrategy:

• StandardRandomStrategy (the default, if none specified)
• CustomVersionOneStrategy

Author:

Steve Ebersole

Field Summary

Fields

Modifier and Type	Field and Description
static String	UUID_GEN_STRATEGY
static String	UUID_GEN_STRATEGY_CLASS

Fields inherited from interface org.hibernate.id.IdentifierGenerator

ENTITY_NAME, JPA_ENTITY_NAME

Constructor Summary

Constructors

Constructor and Description
UUIDGenerator()

Method Summary

Modifier and Type	Method and Description
static UUIDGenerator	buildSessionFactoryUniqueIdentifierGenerator()
void	configure(Type type, Properties params, ServiceRegistry serviceRegistry) Configure this instance, given the value of parameters specified by the user as <param> elements.
Serializable	generate(SessionImplementor session, Object object) Generate a new identifier.

Methods inherited from class java.lang.Object

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

Field Detail

UUID_GEN_STRATEGY

public static final String UUID_GEN_STRATEGY

See Also:

Constant Field Values

UUID_GEN_STRATEGY_CLASS

public static final String UUID_GEN_STRATEGY_CLASS

See Also:

Constant Field Values

Constructor Detail

UUIDGenerator

public UUIDGenerator()

Method Detail

buildSessionFactoryUniqueIdentifierGenerator

public static UUIDGenerator buildSessionFactoryUniqueIdentifierGenerator()

configure

public void configure(Type type,
                      Properties params,
                      ServiceRegistry serviceRegistry)
               throws MappingException

Description copied from interface: Configurable

Configure this instance, given the value of parameters specified by the user as <param> elements. This method is called just once, following instantiation.

Specified by:

configure in interface Configurable

Parameters:

type - The id property type descriptor

params - param values, keyed by parameter name

serviceRegistry - Access to service that may be needed.

Throws:

MappingException

generate

public Serializable generate(SessionImplementor session,
                             Object object)
                      throws HibernateException

Description copied from interface: IdentifierGenerator

Generate a new identifier.

Specified by:

generate in interface IdentifierGenerator

Parameters:

session - The session from which the request originates

object - the entity or collection (idbag) for which the id is being generated

Returns:

a new identifier

Throws:

HibernateException - Indicates trouble generating the identifier