org.eclipse.persistence.descriptors.changetracking

Class AttributeChangeTrackingPolicy

java.lang.Object

org.eclipse.persistence.descriptors.changetracking.DeferredChangeDetectionPolicy

org.eclipse.persistence.descriptors.changetracking.ObjectChangeTrackingPolicy

org.eclipse.persistence.descriptors.changetracking.AttributeChangeTrackingPolicy

All Implemented Interfaces:

java.io.Serializable, ObjectChangePolicy

public class AttributeChangeTrackingPolicy
extends ObjectChangeTrackingPolicy

PUBLIC: An AttributeChangeTrackingPolicy allows change tracking at the attribute level of an object by implementing ChangeTracker. Objects with changed attributes will be processed in the UnitOfWork commit process to include any changes in the results of the commit. Unchanged objects will be ignored.

See Also:

DeferredChangeDetectionPolicy, ObjectChangeTrackingPolicy, ChangeTracker, Serialized Form

Constructor Summary

Constructors

Constructor and Description
AttributeChangeTrackingPolicy()

Method Summary

Modifier and Type	Method and Description
java.lang.Object	buildBackupClone(java.lang.Object clone, ObjectBuilder builder, UnitOfWorkImpl uow) INTERNAL: Only build backup clone
ObjectChangeSet	calculateChangesForExistingObject(java.lang.Object clone, UnitOfWorkChangeSet changeSet, UnitOfWorkImpl unitOfWork, ClassDescriptor descriptor, boolean shouldRaiseEvent) INTERNAL: PERF: Calculate change for the existing object, avoids check for new since already know.
ObjectChangeSet	createObjectChangeSet(java.lang.Object clone, java.lang.Object backUp, UnitOfWorkChangeSet changeSet, boolean isNew, AbstractSession session, ClassDescriptor descriptor) INTERNAL: Create ObjectChangeSet
boolean	isAttributeChangeTrackingPolicy() Used to track instances of the change policies without doing an instance of check
void	revertChanges(java.lang.Object clone, ClassDescriptor descriptor, UnitOfWorkImpl uow, java.util.Map cloneMapping, boolean forRefresh) INTERNAL: Clear the change set in the change event listener.
void	setAggregateChangeListener(java.lang.Object parent, java.lang.Object aggregate, UnitOfWorkImpl uow, ClassDescriptor descriptor, java.lang.String mappingAttribute) INTERNAL: Assign ChangeListener to an aggregate object
java.beans.PropertyChangeListener	setChangeListener(java.lang.Object clone, UnitOfWorkImpl uow, ClassDescriptor descriptor) INTERNAL: Assign AttributeChangeListener to PropertyChangeListener
void	setChangeSetOnListener(ObjectChangeSet objectChangeSet, java.lang.Object clone) INTERNAL: Set the ObjectChangeSet on the Listener, initially used for aggregate support
void	updateListenerForSelfMerge(ObjectChangeListener listener, ForeignReferenceMapping mapping, java.lang.Object source, java.lang.Object target, UnitOfWorkImpl unitOfWork) INTERNAL: In cases where a relationship with detached or new entities is merged into itself previous changes may have been recorded for the detached/new entity that need to be updated.
void	updateWithChanges(java.lang.Object object, ObjectChangeSet changeSet, UnitOfWorkImpl uow, ClassDescriptor descriptor) INTERNAL: Clear the change set in the change event listener.

Methods inherited from class org.eclipse.persistence.descriptors.changetracking.ObjectChangeTrackingPolicy

clearChanges, dissableEventProcessing, enableEventProcessing, initialize, isDeferredChangeDetectionPolicy, isObjectChangeTrackingPolicy, raiseInternalPropertyChangeEvent, shouldCompareExistingObjectForChange

Methods inherited from class org.eclipse.persistence.descriptors.changetracking.DeferredChangeDetectionPolicy

calculateChanges, calculateChangesForNewObject, createObjectChangeSetThroughComparison

Methods inherited from class java.lang.Object

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

Constructor Detail

AttributeChangeTrackingPolicy

public AttributeChangeTrackingPolicy()

Method Detail

calculateChangesForExistingObject

public ObjectChangeSet calculateChangesForExistingObject(java.lang.Object clone,
                                                         UnitOfWorkChangeSet changeSet,
                                                         UnitOfWorkImpl unitOfWork,
                                                         ClassDescriptor descriptor,
                                                         boolean shouldRaiseEvent)

INTERNAL: PERF: Calculate change for the existing object, avoids check for new since already know. Avoid backup clone, as not used.

Specified by:

calculateChangesForExistingObject in interface ObjectChangePolicy

Overrides:

calculateChangesForExistingObject in class DeferredChangeDetectionPolicy

Parameters:

clone - the Object to compute a change set for

changeSet - the change set to add changes to

unitOfWork - the current session

descriptor - the descriptor for this object

shouldRaiseEvent - indicates whether PreUpdate event should be risen (usually true)

Returns:

ObjectChangeSet an object change set describing the changes to this object

createObjectChangeSet

public ObjectChangeSet createObjectChangeSet(java.lang.Object clone,
                                             java.lang.Object backUp,
                                             UnitOfWorkChangeSet changeSet,
                                             boolean isNew,
                                             AbstractSession session,
                                             ClassDescriptor descriptor)

INTERNAL: Create ObjectChangeSet

Overrides:

createObjectChangeSet in class DeferredChangeDetectionPolicy

isAttributeChangeTrackingPolicy

public boolean isAttributeChangeTrackingPolicy()

Used to track instances of the change policies without doing an instance of check

Specified by:

isAttributeChangeTrackingPolicy in interface ObjectChangePolicy

Overrides:

isAttributeChangeTrackingPolicy in class DeferredChangeDetectionPolicy

updateWithChanges

public void updateWithChanges(java.lang.Object object,
                              ObjectChangeSet changeSet,
                              UnitOfWorkImpl uow,
                              ClassDescriptor descriptor)

INTERNAL: Clear the change set in the change event listener.

Specified by:

updateWithChanges in interface ObjectChangePolicy

Overrides:

updateWithChanges in class DeferredChangeDetectionPolicy

updateListenerForSelfMerge

public void updateListenerForSelfMerge(ObjectChangeListener listener,
                                       ForeignReferenceMapping mapping,
                                       java.lang.Object source,
                                       java.lang.Object target,
                                       UnitOfWorkImpl unitOfWork)

INTERNAL: In cases where a relationship with detached or new entities is merged into itself previous changes may have been recorded for the detached/new entity that need to be updated.

Specified by:

updateListenerForSelfMerge in interface ObjectChangePolicy

Overrides:

updateListenerForSelfMerge in class DeferredChangeDetectionPolicy

revertChanges

public void revertChanges(java.lang.Object clone,
                          ClassDescriptor descriptor,
                          UnitOfWorkImpl uow,
                          java.util.Map cloneMapping,
                          boolean forRefresh)

INTERNAL: Clear the change set in the change event listener.

Specified by:

revertChanges in interface ObjectChangePolicy

Overrides:

revertChanges in class DeferredChangeDetectionPolicy

cloneMapping - may not be the same as what is in the uow

setAggregateChangeListener

public void setAggregateChangeListener(java.lang.Object parent,
                                       java.lang.Object aggregate,
                                       UnitOfWorkImpl uow,
                                       ClassDescriptor descriptor,
                                       java.lang.String mappingAttribute)

INTERNAL: Assign ChangeListener to an aggregate object

Specified by:

setAggregateChangeListener in interface ObjectChangePolicy

Overrides:

setAggregateChangeListener in class ObjectChangeTrackingPolicy

setChangeListener

public java.beans.PropertyChangeListener setChangeListener(java.lang.Object clone,
                                                           UnitOfWorkImpl uow,
                                                           ClassDescriptor descriptor)

INTERNAL: Assign AttributeChangeListener to PropertyChangeListener

Specified by:

setChangeListener in interface ObjectChangePolicy

Overrides:

setChangeListener in class ObjectChangeTrackingPolicy

setChangeSetOnListener

public void setChangeSetOnListener(ObjectChangeSet objectChangeSet,
                                   java.lang.Object clone)

INTERNAL: Set the ObjectChangeSet on the Listener, initially used for aggregate support

Specified by:

setChangeSetOnListener in interface ObjectChangePolicy

Overrides:

setChangeSetOnListener in class DeferredChangeDetectionPolicy

buildBackupClone

public java.lang.Object buildBackupClone(java.lang.Object clone,
                                         ObjectBuilder builder,
                                         UnitOfWorkImpl uow)

INTERNAL: Only build backup clone

Specified by:

buildBackupClone in interface ObjectChangePolicy

Overrides:

buildBackupClone in class DeferredChangeDetectionPolicy