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Complex event processing and event series analysis component

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/**************************************************************************************
 * Copyright (C) 2006-2015 EsperTech Inc. All rights reserved.                        *
 * http://www.espertech.com/esper                                                          *
 * http://www.espertech.com                                                           *
 * ---------------------------------------------------------------------------------- *
 * The software in this package is published under the terms of the GPL license       *
 * a copy of which has been included with this distribution in the license.txt file.  *
 **************************************************************************************/
package com.espertech.esper.event.vaevent;

import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.EventPropertyGetter;
import com.espertech.esper.util.NullableObject;

/**
 * Strategy for merging update properties using only existing property's values.
 */
public class UpdateStrategyExists extends UpdateStrategyBase
{
    /**
     * Ctor.
     * @param spec the specification
     */
    public UpdateStrategyExists(RevisionSpec spec)
    {
        super(spec);
    }

    public void handleUpdate(boolean isBaseEventType,
                              RevisionStateMerge revisionState,
                              RevisionEventBeanMerge revisionEvent,
                              RevisionTypeDesc typesDesc)
    {
        EventBean underlyingEvent = revisionEvent.getUnderlyingFullOrDelta();

        NullableObject