/**************************************************************************************
* 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.PropertyAccessException;
import com.espertech.esper.event.BaseNestableEventUtil;
import com.espertech.esper.event.EventAdapterService;
import com.espertech.esper.event.bean.BaseNativePropertyGetter;
import com.espertech.esper.event.bean.BeanEventPropertyGetter;
import java.util.Map;
/**
* A getter that works on POJO events residing within a Map as an event property.
*/
public class MapPOJOEntryPropertyGetter extends BaseNativePropertyGetter implements MapEventPropertyGetter
{
private final String propertyMap;
private final BeanEventPropertyGetter mapEntryGetter;
/**
* Ctor.
* @param propertyMap the property to look at
* @param mapEntryGetter the getter for the map entry
* @param eventAdapterService for producing wrappers to objects
* @param returnType type of the entry returned
*/
public MapPOJOEntryPropertyGetter(String propertyMap, BeanEventPropertyGetter mapEntryGetter, EventAdapterService eventAdapterService, Class returnType) {
super(eventAdapterService, returnType, null);
this.propertyMap = propertyMap;
this.mapEntryGetter = mapEntryGetter;
}
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
return mapEntryGetter.getBeanProp(value);
}
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)
}
}