/*
* *************************************************************************************
* 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.pattern.guard;
import com.espertech.esper.client.EPException;
import com.espertech.esper.epl.expression.ExprNode;
import com.espertech.esper.epl.expression.ExprTimePeriod;
import com.espertech.esper.pattern.*;
import com.espertech.esper.util.JavaClassHelper;
import com.espertech.esper.util.MetaDefItem;
import java.io.Serializable;
import java.util.List;
public class TimerWithinOrMaxCountGuardFactory implements GuardFactory, MetaDefItem, Serializable
{
private static final long serialVersionUID = 6650243610865501435L;
/**
* Number of milliseconds.
*/
protected ExprNode millisecondsExpr;
/**
* Number of count-to max.
*/
protected ExprNode numCountToExpr;
/**
* For converting matched-events maps to events-per-stream.
*/
protected transient MatchedEventConvertor convertor;
public void setGuardParameters(List<ExprNode> parameters, MatchedEventConvertor convertor) throws GuardParameterException
{
String message = "Timer-within-or-max-count guard requires two parameters: "
+ "numeric or time period parameter and an integer-value expression parameter";
if (parameters.size() != 2) {
throw new GuardParameterException(message);
}
if (!JavaClassHelper.isNumeric(parameters.get(0).getExprEvaluator().getType())) {
throw new GuardParameterException(message);
}
if (parameters.get(1).getExprEvaluator().getType() != Integer.class) {
throw new GuardParameterException(message);
}
this.millisecondsExpr = parameters.get(0);
this.numCountToExpr = parameters.get(1);
this.convertor = convertor;
}
protected long computeMilliseconds(MatchedEventMap beginState, PatternAgentInstanceContext context) {
if (millisecondsExpr instanceof ExprTimePeriod) {
ExprTimePeriod timePeriod = (ExprTimePeriod) millisecondsExpr;
return timePeriod.nonconstEvaluator().deltaMillisecondsUseEngineTime(convertor.convert(beginState), context.getAgentInstanceContext());
}
else {
Object millisecondVal = PatternExpressionUtil.evaluate("Timer-Within-Or-Max-Count guard", beginState, millisecondsExpr, convertor, context.getAgentInstanceContext());
if (null == millisecondVal) {
throw new EPException("Timer-within-or-max first parameter evaluated to a null-value");
}
Number param = (Number) millisecondVal;
return Math.round(1000d * param.doubleValue());
}
}
protected int computeNumCountTo(MatchedEventMap beginState, PatternAgentInstanceContext context) {
Object numCountToVal = PatternExpressionUtil.evaluate("Timer-Within-Or-Max-Count guard", beginState, numCountToExpr, convertor,context.getAgentInstanceContext());
if (null == numCountToVal) {
throw new EPException("Timer-within-or-max second parameter evaluated to a null-value");
}
return (Integer) numCountToVal;
}
public Guard makeGuard(PatternAgentInstanceContext context, MatchedEventMap beginState, Quitable quitable, EvalStateNodeNumber stateNodeId, Object guardState)
{
return new TimerWithinOrMaxCountGuard(computeMilliseconds(beginState, context), computeNumCountTo(beginState, context), quitable);
}
}