org.exolab.castor.persist

Class OID

java.lang.Object

org.exolab.castor.persist.OID

All Implemented Interfaces:

java.io.Serializable

public final class OID
extends java.lang.Object
implements java.io.Serializable

Object identifier. An object identifier is unique within a cache engine or other persistence mechanism and is used to locate object based on their identity as well as assure no duplicate identities. The object type and it's identity object define the OID's identity. In addition the OID is used to hold the object's stamp and db-lock access fields which are used to optimize dirty checking within a transaction.

Version:

$Revision: 5980 $ $Date: 2006-04-22 11:05:30 -0600 (Sat, 22 Apr 2006) $

Author:

Assaf Arkin

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
OID(ClassMolder molder, Identity identity) Constructor
OID(ClassMolder molder, OID depends, Identity identity) Constructor

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object obj) Returns true if the two OID's are identical.
OID	getDepends() Get the depended object's oid
Identity	getIdentity() Return the object's identity, if known.
ClassMolder	getMolder() Get the ClassMolder of this object
(package private) java.lang.String	getName() Return the full qualified name of the object's type.
(package private) java.lang.Object	getStamp() Returns the OID's stamp.
(package private) java.lang.String[]	getSuperClassNames() Return the full qualified names of the object's superclasses, if any, otherwise returns null.
int	hashCode()
boolean	isDbLock() Returns true if the object represented by this OID has a database lock.
(package private) void	setDbLock(boolean dbLock) Specifies whether the object represented by this OID has a database lock.
(package private) void	setStamp(java.lang.Object stamp) Sets the OID's stamp.
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

OID

public OID(ClassMolder molder,
           Identity identity)

Constructor

OID

public OID(ClassMolder molder,
           OID depends,
           Identity identity)

Constructor

Method Detail

getDepends

public OID getDepends()

Get the depended object's oid

Returns:

the depended object's oid

getMolder

public ClassMolder getMolder()

Get the ClassMolder of this object

Returns:

the ClassMolder of this object

getStamp

java.lang.Object getStamp()

Returns the OID's stamp. The stamp may be used to efficiently implement dirty checking. The stamp is set with a call to setStamp(java.lang.Object)when the object is loaded, created or stored in persistent storage. Not all persistence engines support the stamp mechanism.

Returns:

The OID's stamp, or null

setStamp

void setStamp(java.lang.Object stamp)

Sets the OID's stamp. The stamp may be used to efficiently implement dirty checking. Not all persistence engines support the stamp mechanism.

Parameters:

stamp - The OID's stamp

setDbLock

void setDbLock(boolean dbLock)

Specifies whether the object represented by this OID has a database lock. Database locks overrides the need to perform dirty checking on the object. This status is set when the object is loaded with db-lock access, created or deleted. It is reset when the object is unlocked.

Parameters:

dbLock - True the object represented by this OID has a database lock

isDbLock

public boolean isDbLock()

Returns true if the object represented by this OID has a database lock. Database locks overrides the need to perform dirty checking on the object. This status is set when the object is loaded with db-lock access, created or deleted. It is reset when the object is unlocked.

Returns:

True the object represented by this OID is loaded with a datbase lock

getIdentity

public Identity getIdentity()

Return the object's identity, if known. And identity exists for every object that was loaded within a transaction and for those objects that were created with an identity. No two objects may have the same identity in persistent storage. If the object was created without an identity this method will return null until the object is first stored and it's identity is set.

Returns:

The object's identity, or null

getName

java.lang.String getName()

Return the full qualified name of the object's type. When using inheritance this is the type's full name of the top most object in the inheritance heirarchy specified in the object mapping.

Returns:

The object's type's full name

getSuperClassNames

java.lang.String[] getSuperClassNames()

Return the full qualified names of the object's superclasses, if any, otherwise returns null.

Returns:

The object's type's superclasses full name

equals

public boolean equals(java.lang.Object obj)

Returns true if the two OID's are identical. Two OID's are identical only if they represent the same object type and have the same identity (based on equality test). If no identity was specified for either or both objects, the objects are not identical.

Overrides:

equals in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object