/******************************************************************************* | |
* 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; | |
/** | |
* <p> | |
* <b>Purpose</b>: Define a singleton empty record to avoid record creation when not required. | |
* <p> | |
* @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(); | |
} | |
} |