com.espertech.esperio.SendableBeanEvent.java Source code

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Here is the source code for com.espertech.esperio.SendableBeanEvent.java

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/**************************************************************************************
 * 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.esperio;

import com.espertech.esper.client.EPException;
import com.espertech.esper.schedule.ScheduleSlot;
import net.sf.cglib.core.ReflectUtils;
import org.apache.commons.beanutils.BeanUtils;

import java.beans.PropertyDescriptor;
import java.util.Map;

/**
 * An implementation of SendableEvent that wraps a Map event for
 * sending into the runtime.
 */
public class SendableBeanEvent extends AbstractSendableEvent {
    private final Object beanToSend;

    /**
     * Converts mapToSend to an instance of beanClass
     * @param mapToSend - the map containing data to send into the runtime
     * @param beanClass  - type of the bean to create from mapToSend
     * @param eventTypeName - the event type name for the map event
     * @param timestamp - the timestamp for this event
     * @param scheduleSlot - the schedule slot for the entity that created this event
     */
    public SendableBeanEvent(Map<String, Object> mapToSend, Class beanClass, String eventTypeName, long timestamp,
            ScheduleSlot scheduleSlot) {
        super(timestamp, scheduleSlot);

        try {
            beanToSend = beanClass.newInstance();
            // pre-create nested properties if any, as BeanUtils does not otherwise populate 'null' objects from their respective properties
            PropertyDescriptor[] pds = ReflectUtils.getBeanSetters(beanClass);
            for (PropertyDescriptor pd : pds) {
                if (!pd.getPropertyType().isPrimitive() && !pd.getPropertyType().getName().startsWith("java")) {
                    BeanUtils.setProperty(beanToSend, pd.getName(), pd.getPropertyType().newInstance());
                }
            }
            // this method silently ignores read only properties on the dest bean but we should
            // have caught them in CSVInputAdapter.constructPropertyTypes.
            BeanUtils.copyProperties(beanToSend, mapToSend);
        } catch (Exception e) {
            throw new EPException("Cannot populate bean instance", e);
        }
    }

    /* (non-Javadoc)
     * @see com.espertech.esperio.SendableEvent#send(com.espertech.esper.client.EPRuntime)
     */
    public void send(AbstractSender sender) {
        sender.sendEvent(this, beanToSend);
    }

    public String toString() {
        return beanToSend.toString();
    }
}