org.hibernate.engine.spi

Class IdentifierValue

java.lang.Object

org.hibernate.engine.spi.IdentifierValue

All Implemented Interfaces:

UnsavedValueStrategy

public class IdentifierValue
extends Object
implements UnsavedValueStrategy

A strategy for determining if an identifier value is an identifier of a new transient instance or a previously persistent transient instance. The strategy is determined by the unsaved-value attribute in the mapping file.

Author:

Gavin King

Field Summary

Fields

Modifier and Type	Field and Description
static IdentifierValue	ANY Always assume the transient instance is newly instantiated
static IdentifierValue	NONE Never assume the transient instance is newly instantiated
static IdentifierValue	NULL Assume the transient instance is newly instantiated if the identifier is null.
static IdentifierValue	UNDEFINED Assume nothing.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	IdentifierValue()
	IdentifierValue(Serializable value) Assume the transient instance is newly instantiated if its identifier is null or equal to value

Method Summary

Modifier and Type	Method and Description
Serializable	getDefaultValue(Object currentValue) Get a default value meant to indicate transience.
Boolean	isUnsaved(Object id) Does the given identifier belong to a new instance?
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

ANY

public static final IdentifierValue ANY

Always assume the transient instance is newly instantiated

NONE

public static final IdentifierValue NONE

Never assume the transient instance is newly instantiated

NULL

public static final IdentifierValue NULL

Assume the transient instance is newly instantiated if the identifier is null.

UNDEFINED

public static final IdentifierValue UNDEFINED

Assume nothing.

Constructor Detail

IdentifierValue

protected IdentifierValue()

IdentifierValue

public IdentifierValue(Serializable value)

Assume the transient instance is newly instantiated if its identifier is null or equal to value

Method Detail

isUnsaved

public Boolean isUnsaved(Object id)

Does the given identifier belong to a new instance?

Specified by:

isUnsaved in interface UnsavedValueStrategy

Parameters:

id - The value to be tested

Returns:

true indicates the value corresponds to unsaved data (aka, transient state; false indicates the value does not corresponds to unsaved data (aka, detached state); null indicates that this strategy was not able to determine conclusively.

getDefaultValue

public Serializable getDefaultValue(Object currentValue)

Description copied from interface: UnsavedValueStrategy

Get a default value meant to indicate transience.

Specified by:

getDefaultValue in interface UnsavedValueStrategy

Parameters:

currentValue - The current state value.

Returns:

The default transience value.

toString

public String toString()

Overrides:

toString in class Object