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package oracle.toplink.essentials.descriptors.changetracking;
import java.io.Serializable;
import oracle.toplink.essentials.internal.sessions.ObjectChangeSet;
import oracle.toplink.essentials.internal.descriptors.*;
import oracle.toplink.essentials.internal.sessions.AbstractSession;
import oracle.toplink.essentials.internal.sessions.UnitOfWorkImpl;
import oracle.toplink.essentials.descriptors.ClassDescriptor;
import oracle.toplink.essentials.internal.helper.IdentityHashtable;
/**
* INTERNAL:
* Implementers of ObjectChangePolicy implement the code which computes changes sets
* for TopLink's UnitOfWork commit process. An ObjectChangePolicy is stored on an
* Object's descriptor.
* @see DeferredChangeDetectionPolicy
* @see ObjectChangeTrackingPolicy
* @see AttributeChangeTrackingPolicy
* @author Tom Ware
*/
public interface ObjectChangePolicy extends Serializable {
/**
* INTERNAL:
* calculateChanges creates a change set for a particular object
* @return oracle.toplink.essentials.changesets.ObjectChangeSet an object change set describing
* the changes to this object
* @param clone the Object to compute a change set for
* @param backUp the old version of the object to use for comparison
* @param changes the change set to add changes to
* @param session the current session
* @param descriptor the descriptor for this object
* @param shouldRiseEvent indicates whether PreUpdate event should be risen (usually true)
*/
public ObjectChangeSet calculateChanges(Object clone, Object backUp, oracle.toplink.essentials.internal.sessions.UnitOfWorkChangeSet changes, AbstractSession session, ClassDescriptor descriptor, boolean shouldRiseEvent);
/**
* INTERNAL:
* Create ObjectChangeSet through comparison. Used in cases where we need to force change calculation (ie aggregates)
*/
public ObjectChangeSet createObjectChangeSetThroughComparison(Object clone, Object backUp, oracle.toplink.essentials.internal.sessions.UnitOfWorkChangeSet changeSet, boolean isNew, AbstractSession session, ClassDescriptor descriptor);
/**
* INTERNAL:
* This method is used to dissable changetracking temporarily
*/
public void dissableEventProcessing(Object changeTracker);
/**
* INTERNAL:
* This method is used to enable changetracking temporarily
*/
public void enableEventProcessing(Object changeTracker);
/**
* 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
*/
public void raiseInternalPropertyChangeEvent(Object source, String propertyName, Object oldValue, Object newValue);
/**
* INTERNAL:
* This method is used to revert an object within the unit of work
*/
public void revertChanges(Object clone, ClassDescriptor descriptor, UnitOfWorkImpl uow, IdentityHashtable cloneMapping);
/**
* INTERNAL:
* This is a place holder for reseting the listener on one of the subclasses
*/
public void clearChanges(Object object, UnitOfWorkImpl uow, ClassDescriptor descriptor);
/**
* INTERNAL:
* This method is used internally to rest the policies back to original state
* This is used when the clones are to be reused.
*/
public void updateWithChanges(Object clone, ObjectChangeSet objectChangeSet, UnitOfWorkImpl uow, ClassDescriptor descriptor);
/**
* INTERNAL:
* Return true if the Object should be compared, false otherwise. This method is implemented to allow
* run time determination of whether a change set should be computed for an object. In general, calculateChanges()
* will only be executed in a UnitOfWork if this method returns true.
* @param object the object that will be compared
* @param unitOfWork the active unitOfWork
* @param descriptor the descriptor for the current object
*/
public boolean shouldCompareForChange(Object object, UnitOfWorkImpl unitOfWork, ClassDescriptor descriptor);
/**
* INTERNAL:
* Assign Changelistner to an aggregate object
*/
public void setAggregateChangeListener(Object parent, Object aggregate, UnitOfWorkImpl uow, ClassDescriptor descriptor, String mappingAttribute);
/**
* INTERNAL:
* Assign appropriate ChangeListener to PropertyChangeListener based on the policy.
*/
public void setChangeListener(Object clone, UnitOfWorkImpl uow, ClassDescriptor descriptor);
/**
* INTERNAL:
* Set the ObjectChangeSet on the Listener, initially used for aggregate support
*/
public void setChangeSetOnListener(ObjectChangeSet objectChangeSet, Object clone);
/**
* INTERNAL:
* Build back up clone.
*/
public Object buildBackupClone(Object clone, ObjectBuilder builder, UnitOfWorkImpl uow);
/**
* INTERNAL:
* initialize the Policy
*/
public void initialize(AbstractSession session, ClassDescriptor descriptor);
/**
* Used to track instances of the change policies without doing an instance of check
*/
public boolean isDeferredChangeDetectionPolicy();
/**
* Used to track instances of the change policies without doing an instance of check
*/
public boolean isObjectChangeTrackingPolicy();
/**
* Used to track instances of the change policies without doing an instance of check
*/
public boolean isAttributeChangeTrackingPolicy();
}
