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oracle.toplink.descriptors.copying
Interface CopyPolicy

All Superinterfaces:

java.lang.Cloneable, java.io.Serializable

All Known Implementing Classes:

AbstractCopyPolicy

public interface CopyPolicy

extends java.lang.Cloneable, java.io.Serializable

Purpose: Allows customization of how an object is cloned. An implementer of CopyPolicy can be set on a descriptor to provide special cloning routine for how an object is cloned in a unit of work. By default the InstantiationCopyPolicy is used which creates a new instance of the class to be copied into. The MethodBasedCopyPolicy can also be used that uses a clone method in the object to clone the object. When a clone method is used it avoid the requirement of having to copy over each of the direct attributes.

Method Summary

java.lang.Object	buildClone(java.lang.Object object, Session session) Return a shallow clone of the object for usage with object copying, or unit of work backup cloning.
boolean	buildsNewInstance() Return if this copy policy creates a new instance, vs a clone.
java.lang.Object	buildWorkingCopyClone(java.lang.Object object, Session session) Return a shallow clone of the object for usage with the unit of work working copy.
java.lang.Object	buildWorkingCopyCloneFromRow(Record row, ObjectLevelReadQuery query, java.util.Vector primaryKey, UnitOfWork uow) Return an instance with the primary key set from the row, used for building a working copy during a unit of work transactional read.
java.lang.Object	clone() Clone the CopyPolicy.
void	initialize(Session session) Allow for any initialization or validation required.
void	setDescriptor(Descriptor descriptor) Set the descriptor.

Method Detail

buildClone

public java.lang.Object buildClone(java.lang.Object object,
                                   Session session)
                            throws DescriptorException

Return a shallow clone of the object for usage with object copying, or unit of work backup cloning.

Throws:

DescriptorException

buildWorkingCopyClone

public java.lang.Object buildWorkingCopyClone(java.lang.Object object,
                                              Session session)
                                       throws DescriptorException

Return a shallow clone of the object for usage with the unit of work working copy.

Throws:

DescriptorException

buildWorkingCopyCloneFromRow

public java.lang.Object buildWorkingCopyCloneFromRow(Record row,
                                                     ObjectLevelReadQuery query,
                                                     java.util.Vector primaryKey,
                                                     UnitOfWork uow)
                                              throws DescriptorException

Return an instance with the primary key set from the row, used for building a working copy during a unit of work transactional read.

Throws:

DescriptorException

clone

public java.lang.Object clone()

Clone the CopyPolicy.

initialize

public void initialize(Session session)
                throws DescriptorException

Allow for any initialization or validation required.

Throws:

DescriptorException

setDescriptor

public void setDescriptor(Descriptor descriptor)

Set the descriptor.

buildsNewInstance

public boolean buildsNewInstance()

Return if this copy policy creates a new instance, vs a clone.

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