/*******************************************************************************
* Copyright (c) 1998, 2008 Oracle. 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.xr;
// Javase imports
// Java extension imports
// EclipseLink imports
import org.eclipse.persistence.sessions.UnitOfWork;
public class UpdateOperation extends Operation {
/**
* Execute <tt>UPDATE</tt> operation on the database
* @param xrService parent <code>XRService</code> that owns this <code>Operation</code>
* @param invocation contains runtime argument values to be bound to the list of
* {@link Parameter}'s.
* @return result - <code>null</code> as the underlying <tt>UPDATE</tt> operation on
* the database does not return a value.
*
* @see {@link Operation}
*/
@Override
public Object invoke(XRServiceAdapter xrService, Invocation invocation) {
Object instance = invocation.getParameters().toArray()[0];
UnitOfWork uow = xrService.getORSession().acquireUnitOfWork();
// read the existing object into the uow
uow.readObject(instance);
// overwrite it
uow.mergeClone(instance);
uow.commit();
return null;
}
}