| /* |
| * Copyright (c) 1998, 2021 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.AbstractRecord; |
| import org.eclipse.persistence.internal.sessions.AbstractSession; |
| |
| /** |
| * Used as the backup value holder in the unit of work for transparent indirection. |
| * This ensure that a reference to the original value holder is held in case the |
| * transparent collection or proxy is replace without first instantiating the original. |
| * |
| * @since 10.1.3 |
| * @author James Sutherland |
| */ |
| public class BackupValueHolder<T> extends DatabaseValueHolder<T> { |
| |
| /** Stores the original uow clone's value holder. */ |
| protected ValueHolderInterface<T> unitOfWorkValueHolder; |
| |
| public BackupValueHolder(ValueHolderInterface<T> unitOfWorkValueHolder) { |
| this.unitOfWorkValueHolder = unitOfWorkValueHolder; |
| } |
| |
| @Override |
| public boolean isPessimisticLockingValueHolder() { |
| return ((DatabaseValueHolder<T>)this.unitOfWorkValueHolder).isPessimisticLockingValueHolder(); |
| } |
| |
| @Override |
| public T instantiateForUnitOfWorkValueHolder(UnitOfWorkValueHolder<T> unitOfWorkValueHolder) { |
| return ((DatabaseValueHolder<T>)this.unitOfWorkValueHolder).instantiateForUnitOfWorkValueHolder(unitOfWorkValueHolder); |
| } |
| |
| @Override |
| public AbstractRecord getRow() { |
| return ((DatabaseValueHolder<T>)this.unitOfWorkValueHolder).getRow(); |
| } |
| |
| @Override |
| public AbstractSession getSession() { |
| return ((DatabaseValueHolder<T>)this.unitOfWorkValueHolder).getSession(); |
| } |
| |
| /** |
| * If the original value holder was not instantiated, |
| * then first instantiate it to obtain the backup value. |
| */ |
| @Override |
| public T instantiate() { |
| // Ensures instantiation of the original, and setting of this back value holder's value. |
| return this.unitOfWorkValueHolder.getValue(); |
| } |
| |
| /** |
| * Return the original uow clone's value holder. |
| */ |
| public ValueHolderInterface<?> getUnitOfWorkValueHolder() { |
| return unitOfWorkValueHolder; |
| } |
| } |