/*
***************************************************************************************
* Copyright (C) 2006 EsperTech, Inc. All rights reserved. *
* http://www.espertech.com/esper *
* 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.metrics.instrumentation.InstrumentationHelper;
import java.util.Collection;
import java.util.concurrent.locks.ReadWriteLock;
/**
* Index for filter parameter constants to match using the equals (=) operator.
* The implementation is based on a regular HashMap.
*/
public final class FilterParamIndexEquals extends FilterParamIndexEqualsBase {
public FilterParamIndexEquals(FilterSpecLookupable lookupable, ReadWriteLock readWriteLock) {
super(lookupable, readWriteLock, FilterOperator.EQUAL);
}
public final void matchEvent(EventBean theEvent, Collection<FilterHandle> matches) {
Object attributeValue = lookupable.getGetter().get(theEvent);
if (InstrumentationHelper.ENABLED) {
InstrumentationHelper.get().qFilterReverseIndex(this, attributeValue);
}
if (attributeValue == null) { // null cannot match, not even null: requires use of "is"
if (InstrumentationHelper.ENABLED) {
InstrumentationHelper.get().aFilterReverseIndex(false);
}
return;
}
// Look up in hashtable
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) {
if (InstrumentationHelper.ENABLED) {
InstrumentationHelper.get().aFilterReverseIndex(false);
}
return;
}
evaluator.matchEvent(theEvent, matches);
if (InstrumentationHelper.ENABLED) {
InstrumentationHelper.get().aFilterReverseIndex(true);
}
}
}