| /* |
| * Copyright (c) 1998, 2020 Oracle and/or its affiliates. All rights reserved. |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v. 2.0 which is available at |
| * http://www.eclipse.org/legal/epl-2.0, |
| * or the Eclipse Distribution License v. 1.0 which is available at |
| * http://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause |
| */ |
| |
| // Contributors: |
| // Oracle - initial API and implementation from Oracle TopLink |
| package org.eclipse.persistence.internal.indirection; |
| |
| import org.eclipse.persistence.indirection.*; |
| import org.eclipse.persistence.internal.sessions.UnitOfWorkImpl; |
| import org.eclipse.persistence.mappings.DatabaseMapping; |
| import org.eclipse.persistence.mappings.foundation.AbstractTransformationMapping; |
| |
| /** |
| * UnitOfWorkTransformerValueHolder wraps a database-stored object and |
| * implements behavior to access it. The object is read from |
| * the database by invoking a user-specified transformer object. |
| * This value holder is used only in the unit of work. |
| * |
| * Most of the methods ignore the actual attribute values and are |
| * simply used to trigger instantiation. |
| * |
| * @author Sati |
| */ |
| public class UnitOfWorkTransformerValueHolder extends UnitOfWorkValueHolder { |
| protected transient Object cloneOfObject; |
| protected transient Object object; |
| |
| public UnitOfWorkTransformerValueHolder(ValueHolderInterface attributeValue, Object original, Object clone, AbstractTransformationMapping mapping, UnitOfWorkImpl unitOfWork) { |
| this(attributeValue, clone, mapping, unitOfWork); |
| this.object = original; |
| this.cloneOfObject = clone; |
| } |
| |
| protected UnitOfWorkTransformerValueHolder(ValueHolderInterface attributeValue, Object clone, DatabaseMapping mapping, UnitOfWorkImpl unitOfWork) { |
| super(attributeValue, clone, mapping, unitOfWork); |
| } |
| |
| /** |
| * Backup the clone attribute value. |
| */ |
| @Override |
| protected Object buildBackupCloneFor(Object cloneAttributeValue) { |
| return buildCloneFor(cloneAttributeValue); |
| } |
| |
| /** |
| * Clone the original attribute value. |
| */ |
| @Override |
| public Object buildCloneFor(Object originalAttributeValue) { |
| return getMapping().buildCloneForPartObject(originalAttributeValue, getObject(), null, getCloneOfObject(), getUnitOfWork(), null, true, true); |
| } |
| |
| protected Object getCloneOfObject() { |
| return cloneOfObject; |
| } |
| |
| protected Object getObject() { |
| return object; |
| } |
| |
| /** |
| * Ensure that the backup value holder is populated. |
| */ |
| @Override |
| public void setValue(Object theValue) { |
| // Must force instantiation to be able to compare with the old value. |
| if (!this.isInstantiated) { |
| instantiate(); |
| } |
| super.setValue(theValue); |
| } |
| } |