| /* |
| * 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.sessions; |
| |
| import org.eclipse.persistence.internal.helper.DatabaseField; |
| import org.eclipse.persistence.sessions.DatabaseRecord; |
| |
| /** |
| * <p> |
| * <b>Purpose</b>: Define a singleton empty record to avoid record creation when not required. |
| * @since 11 |
| * @author James Sutherland |
| */ |
| public class EmptyRecord extends DatabaseRecord { |
| |
| /** PERF: Store a singleton empty record to avoid creation when not required. */ |
| public static final DatabaseRecord emptyRecord = new EmptyRecord(); |
| |
| /** |
| * Return the singleton empty record. |
| */ |
| public static DatabaseRecord getEmptyRecord() { |
| return EmptyRecord.emptyRecord; |
| } |
| |
| protected EmptyRecord() { |
| super(0); |
| } |
| |
| /** |
| * Need to return a real record. |
| */ |
| @Override |
| public DatabaseRecord clone() { |
| return new DatabaseRecord(); |
| } |
| |
| @Override |
| public void add(DatabaseField key, Object value) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public Object put(String key, Object value) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public Object put(DatabaseField key, Object value) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public void replaceAt(Object value, int index) { |
| throw new UnsupportedOperationException(); |
| } |
| } |