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package oracle.toplink.essentials.descriptors.copying;

import oracle.toplink.essentials.exceptions.*;
import oracle.toplink.essentials.sessions.*;
import oracle.toplink.essentials.descriptors.ClassDescriptor;
import oracle.toplink.essentials.queryframework.ObjectLevelReadQuery;
import oracle.toplink.essentials.queryframework.ObjectBuildingQuery;

/**
 * 

Purpose: Allows customization of how an object is cloned. * This class defines common behavoir that allows a subclass to be used * and set on a descriptor to provide a special cloning routine for how an object * is cloned in a unit of work. */ public abstract class AbstractCopyPolicy implements CopyPolicy { protected ClassDescriptor descriptor; public AbstractCopyPolicy() { super(); } public abstract Object buildClone(Object domainObject, Session session) throws DescriptorException; /** * By default use the buildClone. */ public Object buildWorkingCopyClone(Object domainObject, Session session) throws DescriptorException { return buildClone(domainObject, session); } /** * Create a new instance, unless a workingCopyClone method is specified, then build a new instance and clone it. */ public Object buildWorkingCopyCloneFromRow(Record row, ObjectLevelReadQuery query) throws DescriptorException { return this.buildWorkingCopyCloneFromRow(row, (ObjectBuildingQuery)query); } /** * By default create a new instance. */ public Object buildWorkingCopyCloneFromRow(Record row, ObjectBuildingQuery query) throws DescriptorException { return getDescriptor().getObjectBuilder().buildNewInstance(); } /** * INTERNAL: * Clones the CopyPolicy */ public Object clone() { try { // clones itself return super.clone(); } catch (Exception exception) { } return null; } /** * Return the descriptor. */ protected ClassDescriptor getDescriptor() { return descriptor; } /** * Do nothing by default. */ public void initialize(Session session) throws DescriptorException { // Do nothing by default. } /** * Set the descriptor. */ public void setDescriptor(ClassDescriptor descriptor) { this.descriptor = descriptor; } /** * Return if a new instance is created or a clone. */ public abstract boolean buildsNewInstance(); }





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