org.eclipse.persistence.internal.sessions.EmptyRecord Maven / Gradle / Ivy
Show all versions of eclipselink Show documentation
/*******************************************************************************
* Copyright (c) 1998, 2013 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 v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* 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 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();
}
}