org.apache.openjpa.kernel
Class VersionAttachStrategy

java.lang.Object
  org.apache.openjpa.kernel.TransferFieldManager
      org.apache.openjpa.kernel.AttachStrategy
          org.apache.openjpa.kernel.VersionAttachStrategy

All Implemented Interfaces:

FieldConsumer, FieldManager, FieldSupplier, DetachState

 class VersionAttachStrategy
extends AttachStrategy
implements DetachState

Handles attaching instances using version and primary key fields.

Author:

Steve Kim

Field Summary

Fields inherited from class org.apache.openjpa.kernel.TransferFieldManager

dblval, field, longval, objval

Fields inherited from interface org.apache.openjpa.kernel.DetachState

DETACH_ALL, DETACH_FETCH_GROUPS, DETACH_FGS, DETACH_LOADED

Constructor Summary

VersionAttachStrategy()

Method Summary

Object	attach(AttachManager manager, Object toAttach, ClassMetaData meta, PersistenceCapable into, OpenJPAStateManager owner, ValueMetaData ownerMeta, boolean explicit) Attach.
protected PersistenceCapable	findFromDatabase(AttachManager manager, Object pc) Find a PersistenceCapable instance of an Object if it exists in the database.
protected Object	getDetachedObjectId(AttachManager manager, Object toAttach) Return the identity of the given detached instance.
protected void	provideField(Object toAttach, StateManagerImpl sm, int field) Provide the given field into this field manager.

Methods inherited from class org.apache.openjpa.kernel.AttachStrategy

attachCollection, attachField, attachMap, getReference, persist

Methods inherited from class org.apache.openjpa.kernel.TransferFieldManager

clear, fetchBooleanField, fetchByteField, fetchCharField, fetchDoubleField, fetchFloatField, fetchIntField, fetchLongField, fetchObjectField, fetchShortField, fetchStringField, storeBooleanField, storeByteField, storeCharField, storeDoubleField, storeFloatField, storeIntField, storeLongField, storeObjectField, storeShortField, storeStringField

Methods inherited from class java.lang.Object

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

Constructor Detail

VersionAttachStrategy

VersionAttachStrategy()

Method Detail

getDetachedObjectId

protected Object getDetachedObjectId(AttachManager manager,
                                     Object toAttach)

Description copied from class: AttachStrategy

Return the identity of the given detached instance.

Specified by:

getDetachedObjectId in class AttachStrategy

provideField

protected void provideField(Object toAttach,
                            StateManagerImpl sm,
                            int field)

Description copied from class: AttachStrategy

Provide the given field into this field manager.

Specified by:

provideField in class AttachStrategy

attach

public Object attach(AttachManager manager,
                     Object toAttach,
                     ClassMetaData meta,
                     PersistenceCapable into,
                     OpenJPAStateManager owner,
                     ValueMetaData ownerMeta,
                     boolean explicit)

Description copied from class: AttachStrategy

Attach.

Specified by:

attach in class AttachStrategy

Parameters:

manager - manager holding cache of attached instances

toAttach - detached instance

meta - metadata for the instance being attached

into - instance we're attaching into

owner - state manager for into

ownerMeta - field we traversed to find toAttach

explicit - whether to make new instances explicitly persistent

findFromDatabase

protected PersistenceCapable findFromDatabase(AttachManager manager,
                                              Object pc)

Find a PersistenceCapable instance of an Object if it exists in the database. If the object is null or can't be found in the database.

Parameters:

pc - An object which will be attached into the current context. The object may or may not correspond to a row in the database.

Returns:

If the object is null or can't be found in the database this method returns null. Otherwise a PersistenceCapable representation of the object is returned.