private static ExprOptionalConstant GetExprOrConstant(ExprNode exprNode, TimeAbacus timeAbacus)
{
if (exprNode is ExprTimePeriod)
{
var timePeriod = (ExprTimePeriod)exprNode;
if (!timePeriod.HasMonth && !timePeriod.HasYear)
{
// no-month and constant
if (exprNode.IsConstantResult)
{
var sec = timePeriod.EvaluateAsSeconds(null, true, null);
var l = timeAbacus.DeltaForSecondsDouble(sec);
IntervalDeltaExprEvaluator eval = new ProxyIntervalDeltaExprEvaluator
{
ProcEvaluate = (reference, eventsPerStream, isNewData, context) => l,
};
return(new ExprOptionalConstant(eval, l));
}
// no-month and not constant
else
{
IntervalDeltaExprEvaluator eval = new ProxyIntervalDeltaExprEvaluator
{
ProcEvaluate = (reference, eventsPerStream, isNewData, context) =>
{
double sec = timePeriod.EvaluateAsSeconds(eventsPerStream, isNewData, context);
return(timeAbacus.DeltaForSecondsDouble(sec));
},
};
return(new ExprOptionalConstant(eval, null));
}
}
// has-month
else
{
// has-month and constant
if (exprNode.IsConstantResult)
{
ExprTimePeriodEvalDeltaConst timerPeriodConst = timePeriod.ConstEvaluator(null);
IntervalDeltaExprEvaluator eval = new ProxyIntervalDeltaExprEvaluator
{
ProcEvaluate = (reference, eventsPerStream, isNewData, context) =>
{
return(timerPeriodConst.DeltaAdd(reference));
},
};
return(new ExprOptionalConstant(eval, null));
}
// has-month and not constant
else
{
ExprTimePeriodEvalDeltaNonConst timerPeriodNonConst = timePeriod.NonconstEvaluator();
IntervalDeltaExprEvaluator eval = new ProxyIntervalDeltaExprEvaluator
{
ProcEvaluate = (reference, eventsPerStream, isNewData, context) => timerPeriodNonConst.DeltaAdd(
reference, eventsPerStream, isNewData, context),
};
return(new ExprOptionalConstant(eval, null));
}
}
}
else if (ExprNodeUtility.IsConstantValueExpr(exprNode))
{
var constantNode = (ExprConstantNode)exprNode;
long l = constantNode.GetConstantValue(null).AsLong();
IntervalDeltaExprEvaluator eval = new ProxyIntervalDeltaExprEvaluator
{
ProcEvaluate = (reference, eventsPerStream, isNewData, context) => l,
};
return(new ExprOptionalConstant(eval, l));
}
else
{
var evaluator = exprNode.ExprEvaluator;
IntervalDeltaExprEvaluator eval = new ProxyIntervalDeltaExprEvaluator
{
ProcEvaluate = (reference, eventsPerStream, isNewData, context) => evaluator.Evaluate(
new EvaluateParams(eventsPerStream, isNewData, context)).AsLong(),
};
return(new ExprOptionalConstant(eval, null));
}
}
/// <summary>
/// Constructor.
/// </summary>
/// <param name="timePeriod">is the number of minutes or seconds to batch events for, may include variables</param>
/// <param name="isStartConditionOnCreation">if set to <c>true</c> [is start condition on creation].</param>
public OutputConditionTimeFactory(ExprTimePeriod timePeriod, bool isStartConditionOnCreation)
{
_timePeriod = timePeriod;
_timePeriodDeltaComputation = timePeriod.NonconstEvaluator();
_isStartConditionOnCreation = isStartConditionOnCreation;
}