com.espertech.esper.epl.join.table.PropertyIndexedEventTableSingleCoerceAdd Maven / Gradle / Ivy

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Complex event processing and event series analysis component

There is a newer version: 7.1.0

/**************************************************************************************
 * Copyright (C) 2008 EsperTech, Inc. All rights reserved.                            *
 * http://esper.codehaus.org                                                          *
 * 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.epl.join.table;

import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.EventType;
import com.espertech.esper.event.EventBeanUtility;
import com.espertech.esper.util.JavaClassHelper;
import com.espertech.esper.util.SimpleNumberCoercer;
import com.espertech.esper.util.SimpleNumberCoercerFactory;

public class PropertyIndexedEventTableSingleCoerceAdd extends PropertyIndexedEventTableSingle
{
    private final SimpleNumberCoercer coercer;
    private final Class coercionType;

    /**
     * Ctor.
     * @param streamNum is the stream number of the indexed stream
     * @param eventType is the event type of the indexed stream
     * @param propertyName are the property names to get property values
     * @param coercionType are the classes to coerce indexed values to
     */
    public PropertyIndexedEventTableSingleCoerceAdd(int streamNum, EventType eventType, String propertyName, Class coercionType)
    {
        super(streamNum, eventType, propertyName);
        this.coercionType = coercionType;
        if (JavaClassHelper.isNumeric(coercionType)) {
            coercer = SimpleNumberCoercerFactory.getCoercer(null, coercionType);
        }
        else {
            coercer = null;
        }
    }

    protected Object getKey(EventBean event)
    {
        Object keyValue = super.getKey(event);
        if ((keyValue != null) && (!keyValue.getClass().equals(coercionType)))
        {
            if (keyValue instanceof Number)
            {
                keyValue = coercer.coerceBoxed((Number) keyValue);
            }
            else {
                keyValue = EventBeanUtility.coerce(keyValue, coercionType);
            }
        }
        return keyValue;
    }
}