| /* |
| * 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.oxm; |
| |
| import java.lang.ref.WeakReference; |
| |
| /** |
| * INTENRAL: |
| * <p><b>Purpose</b>: This class is used for caching objects based on Object |
| * Identity instead of a Primary Key. This class acts as the Primary Key, and |
| * wraps the domain object itself in a weak reference. hashCode and equals |
| * methods are implemented to insure identity is maintained.</p> |
| * @author mmacivor |
| * @since 10g |
| */ |
| |
| public class WeakObjectWrapper { |
| protected WeakReference reference; |
| |
| public WeakObjectWrapper(Object domainObject) { |
| reference = new WeakReference(domainObject); |
| } |
| |
| public Object getDomainObject() { |
| return reference.get(); |
| } |
| |
| public void setDomainObject(Object object) { |
| reference = new WeakReference(object); |
| } |
| |
| @Override |
| public int hashCode() { |
| if (getDomainObject() == null) { |
| return -1; |
| } |
| return getDomainObject().hashCode(); |
| } |
| |
| @Override |
| public boolean equals(Object wrapper) { |
| if (!(wrapper instanceof WeakObjectWrapper)) { |
| return false; |
| } |
| return getDomainObject() == ((WeakObjectWrapper)wrapper).getDomainObject(); |
| } |
| } |