Package 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.

Field Summary

Fields

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

Method Summary

Modifier and Type	Method	Description
@Nullable Object	getDefaultValue(@Nullable Object currentValue)	Get a default value meant to indicate transience.
@Nullable Boolean	isUnsaved(@Nullable 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(Object value)

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

Method Detail

isUnsaved

public @Nullable Boolean isUnsaved(@Nullable 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 @Nullable Object getDefaultValue(@Nullable 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