/**************************************************************************************
* 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.map;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.EventPropertyGetter;
import com.espertech.esper.client.PropertyAccessException;
import com.espertech.esper.event.BaseNestableEventUtil;
import java.util.Map;
/**
* A getter that works on EventBean events residing within a Map as an event property.
*/
public class MapEventBeanEntryPropertyGetter implements MapEventPropertyGetter {
private final String propertyMap;
private final EventPropertyGetter eventBeanEntryGetter;
/**
* Ctor.
* @param propertyMap the property to look at
* @param eventBeanEntryGetter the getter for the map entry
*/
public MapEventBeanEntryPropertyGetter(String propertyMap, EventPropertyGetter eventBeanEntryGetter) {
this.propertyMap = propertyMap;
this.eventBeanEntryGetter = eventBeanEntryGetter;
}
public Object getMap(Map<String, Object> map) throws PropertyAccessException
{
// If the map does not contain the key, this is allowed and represented as null
Object value = map.get(propertyMap);
if (value == null)
{
return null;
}
// Object within the map
EventBean theEvent = (EventBean) value;
return eventBeanEntryGetter.get(theEvent);
}
public boolean isMapExistsProperty(Map<String, Object> map)
{
return true; // Property exists as the property is not dynamic (unchecked)
}
public Object get(EventBean obj)
{
return getMap(BaseNestableEventUtil.checkedCastUnderlyingMap(obj));
}
public boolean isExistsProperty(EventBean eventBean)
{
return true; // Property exists as the property is not dynamic (unchecked)
}
public Object getFragment(EventBean obj)
{
Map<String, Object> map = BaseNestableEventUtil.checkedCastUnderlyingMap(obj);
// If the map does not contain the key, this is allowed and represented as null
Object value = map.get(propertyMap);
if (value == null)
{
return null;
}
// Object within the map
EventBean theEvent = (EventBean) value;
return eventBeanEntryGetter.getFragment(theEvent);
}
}