/**************************************************************************************
* 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.event.bean;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.EventType;
import com.espertech.esper.client.EventPropertyGetter;
import com.espertech.esper.client.PropertyAccessException;
/**
* Wrapper for Java bean (POJO or regular) Java objects the represent events.
* Allows access to event properties, which is done through the getter supplied by the event type.
* {@link EventType} instances containing type information are obtained from {@link BeanEventTypeFactory}.
* Two BeanEventBean instances are equal if they have the same event type and refer to the same instance of event object.
* Clients that need to compute equality between Java beans wrapped by this class need to obtain the underlying object.
*/
public class BeanEventBean implements EventBean
{
private EventType eventType;
private Object event;
/**
* Constructor.
* @param event is the event object
* @param eventType is the schema information for the event object.
*/
public BeanEventBean(Object event, EventType eventType)
{
this.eventType = eventType;
this.event = event;
}
public Object getUnderlying()
{
return event;
}
public EventType getEventType()
{
return eventType;
}
public Object get(String property) throws PropertyAccessException
{
EventPropertyGetter getter = eventType.getGetter(property);
if (getter == null)
{
throw new PropertyAccessException("Property named '" + property + "' is not a valid property name for this type");
}
return getter.get(this);
}
public String toString()
{
return "BeanEventBean" +
" eventType=" + eventType +
" bean=" + event;
}
public Object getFragment(String propertyExpression)
{
EventPropertyGetter getter = eventType.getGetter(propertyExpression);
if (getter == null)
{
throw new PropertyAccessException("Property named '" + propertyExpression + "' is not a valid property name for this type");
}
return getter.getFragment(this);
}
}