org.eclipse.persistence.internal.sessions.EmptyRecord Maven / Gradle / Ivy
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/*
* Copyright (c) 1998, 2018 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;
/**
*
* Purpose: 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.
*/
public DatabaseRecord clone() {
return new DatabaseRecord();
}
public void add(DatabaseField key, Object value) {
throw new UnsupportedOperationException();
}
public Object put(String key, Object value) {
throw new UnsupportedOperationException();
}
public Object put(DatabaseField key, Object value) {
throw new UnsupportedOperationException();
}
public void replaceAt(Object value, int index) {
throw new UnsupportedOperationException();
}
}