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/*******************************************************************************
 * Copyright (c) 1998, 2012 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.xr;

// Javase imports

// Java extension imports

// EclipseLink imports
import org.eclipse.persistence.queries.FetchGroup;
import org.eclipse.persistence.queries.ReadObjectQuery;
import org.eclipse.persistence.sessions.UnitOfWork;

public class UpdateOperation extends Operation {

    /**
     * Execute UPDATE operation on the database
     * @param   xrService parent XRService that owns this Operation
     * @param   invocation contains runtime argument values to be bound to the list of
     *          {@link Parameter}'s.
     * @return  result - null as the underlying UPDATE operation on
     *          the database does not return a value.
     *
     * @see  {@link Operation}
     */
    @Override
    public Object invoke(XRServiceAdapter xrService, Invocation invocation) {
    	XRDynamicEntity instance = (XRDynamicEntity)invocation.getParameters().toArray()[0];
        UnitOfWork uow = xrService.getORSession().acquireUnitOfWork();
        ReadObjectQuery query = new ReadObjectQuery();
        query.setSelectionObject(instance);
        query.setIsExecutionClone(true);
        FetchGroup simpleFetchGroup = new FetchGroup();
        for (String propertyName : instance.fetchPropertiesManager().getPropertyNames()) {
            if (instance.isSet(propertyName)) {
                simpleFetchGroup.addAttribute(propertyName);
            }
        }
        query.setFetchGroup(simpleFetchGroup);
        // read the existing object into the uow
        uow.executeQuery(query);
        // merge in only properties that are set
        uow.mergeClone(instance);
        uow.commit();
        return null;
    }
}