/**************************************************************************************
* 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.filter;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.EventPropertyGetter;
import com.espertech.esper.client.EventType;
import java.util.Collection;
/**
* Index for filter parameter constants to match using the equals (=) operator.
* The implementation is based on a regular HashMap.
*/
public final class FilterParamIndexEqualsIs extends FilterParamIndexEqualsBase
{
public FilterParamIndexEqualsIs(FilterSpecLookupable lookupable) {
super(lookupable, FilterOperator.IS);
}
public final void matchEvent(EventBean theEvent, Collection<FilterHandle> matches)
{
Object attributeValue = lookupable.getGetter().get(theEvent);
EventEvaluator evaluator = null;
constantsMapRWLock.readLock().lock();
try
{
evaluator = constantsMap.get(attributeValue);
}
finally
{
constantsMapRWLock.readLock().unlock();
}
// No listener found for the value, return
if (evaluator == null)
{
return;
}
evaluator.matchEvent(theEvent, matches);
}
}