com.espertech.esper.event.map.MapEventBeanCopyMethodWithArrayMap Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of esper Show documentation
Complex event processing and event series analysis component
The newest version!
/*
 ***************************************************************************************
 *  Copyright (C) 2006 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.map;

import com.espertech.esper.client.EventBean;
import com.espertech.esper.event.EventAdapterService;
import com.espertech.esper.event.EventBeanCopyMethod;
import com.espertech.esper.event.MappedEventBean;

import java.lang.reflect.Array;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

/**
 * Copy method for Map-underlying events.
 */
public class MapEventBeanCopyMethodWithArrayMap implements EventBeanCopyMethod {
    private final MapEventType mapEventType;
    private final EventAdapterService eventAdapterService;
    private final Set mapPropertiesToCopy;
    private final Set arrayPropertiesToCopy;

    /**
     * Ctor.
     *
     * @param mapEventType          map event type
     * @param eventAdapterService   for copying events
     * @param mapPropertiesToCopy   map props
     * @param arrayPropertiesToCopy array props
     */
    public MapEventBeanCopyMethodWithArrayMap(MapEventType mapEventType, EventAdapterService eventAdapterService, Set mapPropertiesToCopy, Set arrayPropertiesToCopy) {
        this.mapEventType = mapEventType;
        this.eventAdapterService = eventAdapterService;
        this.mapPropertiesToCopy = mapPropertiesToCopy;
        this.arrayPropertiesToCopy = arrayPropertiesToCopy;
    }

    public EventBean copy(EventBean theEvent) {
        MappedEventBean mapped = (MappedEventBean) theEvent;
        Map props = mapped.getProperties();
        HashMap shallowCopy = new HashMap(props);

        for (String name : mapPropertiesToCopy) {
            Map innerMap = (Map) props.get(name);
            if (innerMap != null) {
                Map copy = new HashMap(innerMap);
                shallowCopy.put(name, copy);
            }
        }

        for (String name : arrayPropertiesToCopy) {
            Object array = props.get(name);
            if (array != null && array.getClass().isArray() && Array.getLength(array) != 0) {
                Object copied = Array.newInstance(array.getClass().getComponentType(), Array.getLength(array));
                System.arraycopy(array, 0, copied, 0, Array.getLength(array));
                shallowCopy.put(name, copied);
            }
        }
        return eventAdapterService.adapterForTypedMap(shallowCopy, mapEventType);
    }
}