Package org.eclipse.persistence.descriptors.changetracking

Class ObjectChangeTrackingPolicy

java.lang.Object

org.eclipse.persistence.descriptors.changetracking.DeferredChangeDetectionPolicy

org.eclipse.persistence.descriptors.changetracking.ObjectChangeTrackingPolicy

All Implemented Interfaces:

Serializable, ObjectChangePolicy

Direct Known Subclasses:

AttributeChangeTrackingPolicy

public class ObjectChangeTrackingPolicy
extends DeferredChangeDetectionPolicy

PUBLIC: A ObjectChangeTrackingPolicy allows an object to calculate for itself whether it should has changed by implementing ChangeTracker. Changed objects 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, ChangeTracker, Serialized Form

Constructor Summary

Constructors

Constructor	Description
ObjectChangeTrackingPolicy()

Method Summary

Modifier and Type	Method	Description
void	clearChanges(Object clone, UnitOfWorkImpl uow, ClassDescriptor descriptor, boolean forRefresh)	INTERNAL: Clear the changes in the ObjectChangeListener
void	dissableEventProcessing(Object changeTracker)	INTERNAL: This method is used to disable changetracking temporarily
void	enableEventProcessing(Object changeTracker)	INTERNAL: This method is used to enable changetracking temporarily
void	initialize(AbstractSession session, ClassDescriptor descriptor)	INTERNAL: initialize the Policy
boolean	isDeferredChangeDetectionPolicy()	Used to track instances of the change policies without doing an instance of check
boolean	isObjectChangeTrackingPolicy()	Used to track instances of the change policies without doing an instance of check
void	raiseInternalPropertyChangeEvent(Object source, String propertyName, Object oldValue, Object newValue)	INTERNAL: This may cause a property change event to be raised to a listner in the case that a listener exists.
void	setAggregateChangeListener(Object parent, Object aggregate, UnitOfWorkImpl uow, ClassDescriptor descriptor, String mappingAttribute)	INTERNAL: Assign ChangeListener to an aggregate object
PropertyChangeListener	setChangeListener(Object clone, UnitOfWorkImpl uow, ClassDescriptor descriptor)	INTERNAL: Assign ObjectChangeListener to PropertyChangeListener
boolean	shouldCompareExistingObjectForChange(Object object, UnitOfWorkImpl unitOfWork, ClassDescriptor descriptor)	INTERNAL: Return true if the Object should be compared, false otherwise.

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

buildBackupClone, calculateChanges, calculateChangesForExistingObject, calculateChangesForNewObject, createObjectChangeSet, createObjectChangeSetThroughComparison, isAttributeChangeTrackingPolicy, revertChanges, setChangeSetOnListener, updateListenerForSelfMerge, updateWithChanges

Methods inherited from class java.lang.Object

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

Constructor Detail

ObjectChangeTrackingPolicy

public ObjectChangeTrackingPolicy()

Method Detail

dissableEventProcessing

public void dissableEventProcessing(Object changeTracker)

INTERNAL: This method is used to disable changetracking temporarily

Specified by:

dissableEventProcessing in interface ObjectChangePolicy

Overrides:

dissableEventProcessing in class DeferredChangeDetectionPolicy

enableEventProcessing

public void enableEventProcessing(Object changeTracker)

INTERNAL: This method is used to enable changetracking temporarily

Specified by:

enableEventProcessing in interface ObjectChangePolicy

Overrides:

enableEventProcessing in class DeferredChangeDetectionPolicy

shouldCompareExistingObjectForChange

public boolean shouldCompareExistingObjectForChange(Object object,
                                                    UnitOfWorkImpl unitOfWork,
                                                    ClassDescriptor descriptor)

INTERNAL: Return true if the Object should be compared, false otherwise. In ObjectChangeTrackingPolicy or AttributeChangeTracking Policy this method will return true if the object is new, if the object is in the OptimisticReadLock list or if the listener.hasChanges() returns true.

Specified by:

shouldCompareExistingObjectForChange in interface ObjectChangePolicy

Overrides:

shouldCompareExistingObjectForChange in class DeferredChangeDetectionPolicy

Parameters:

object - the object that will be compared

unitOfWork - the active unitOfWork

descriptor - the descriptor for the current object

raiseInternalPropertyChangeEvent

public void raiseInternalPropertyChangeEvent(Object source,
                                             String propertyName,
                                             Object oldValue,
                                             Object newValue)

INTERNAL: This may cause a property change event to be raised to a listner in the case that a listener exists. If there is no listener then this call is a no-op

Specified by:

raiseInternalPropertyChangeEvent in interface ObjectChangePolicy

Overrides:

raiseInternalPropertyChangeEvent in class DeferredChangeDetectionPolicy

setAggregateChangeListener

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

INTERNAL: Assign ChangeListener to an aggregate object

Specified by:

setAggregateChangeListener in interface ObjectChangePolicy

Overrides:

setAggregateChangeListener in class DeferredChangeDetectionPolicy

setChangeListener

public PropertyChangeListener setChangeListener(Object clone,
                                                UnitOfWorkImpl uow,
                                                ClassDescriptor descriptor)

INTERNAL: Assign ObjectChangeListener to PropertyChangeListener

Specified by:

setChangeListener in interface ObjectChangePolicy

Overrides:

setChangeListener in class DeferredChangeDetectionPolicy

clearChanges

public void clearChanges(Object clone,
                         UnitOfWorkImpl uow,
                         ClassDescriptor descriptor,
                         boolean forRefresh)

INTERNAL: Clear the changes in the ObjectChangeListener

Specified by:

clearChanges in interface ObjectChangePolicy

Overrides:

clearChanges in class DeferredChangeDetectionPolicy

initialize

public void initialize(AbstractSession session,
                       ClassDescriptor descriptor)

INTERNAL: initialize the Policy

Specified by:

initialize in interface ObjectChangePolicy

Overrides:

initialize in class DeferredChangeDetectionPolicy

isDeferredChangeDetectionPolicy

public boolean isDeferredChangeDetectionPolicy()

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

Specified by:

isDeferredChangeDetectionPolicy in interface ObjectChangePolicy

Overrides:

isDeferredChangeDetectionPolicy in class DeferredChangeDetectionPolicy

isObjectChangeTrackingPolicy

public boolean isObjectChangeTrackingPolicy()

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

Specified by:

isObjectChangeTrackingPolicy in interface ObjectChangePolicy

Overrides:

isObjectChangeTrackingPolicy in class DeferredChangeDetectionPolicy