public static ExcludePlanHint GetHint(
string[] streamNames,
StatementRawInfo rawInfo,
StatementCompileTimeServices services)
{
IList<string> hints = HintEnum.EXCLUDE_PLAN.GetHintAssignedValues(rawInfo.Annotations);
if (hints == null) {
return null;
}
IList<ExprEvaluator> filters = new List<ExprEvaluator>();
foreach (string hint in hints) {
if (string.IsNullOrWhiteSpace(hint)) {
continue;
}
ExprForge forge = ExcludePlanHintExprUtil.ToExpression(hint, rawInfo, services);
if (Boxing.GetBoxedType(forge.EvaluationType) != typeof(bool?)) {
throw new ExprValidationException(
"Expression provided for hint " + HintEnum.EXCLUDE_PLAN + " must return a boolean value");
}
filters.Add(forge.ExprEvaluator);
}
return new ExcludePlanHint(streamNames, filters, services);
}
public bool Filter(
int streamLookup,
int streamIndexed,
ExcludePlanFilterOperatorType opType,
params ExprNode[] exprNodes)
{
EventBean @event = ExcludePlanHintExprUtil.ToEvent(
streamLookup,
streamIndexed,
streamNames[streamLookup],
streamNames[streamIndexed],
opType.GetName().ToLowerInvariant(),
exprNodes);
if (queryPlanLogging && QUERY_PLAN_LOG.IsInfoEnabled) {
QUERY_PLAN_LOG.Info("Exclude-plan-hint combination " + EventBeanUtility.PrintEvent(@event));
}
EventBean[] eventsPerStream = new EventBean[] {@event};
foreach (ExprEvaluator evaluator in evaluators) {
var pass = evaluator.Evaluate(eventsPerStream, true, null);
if (pass != null && true.Equals(pass)) {
if (queryPlanLogging && QUERY_PLAN_LOG.IsInfoEnabled) {
QUERY_PLAN_LOG.Info("Exclude-plan-hint combination : true");
}
return true;
}
}
if (queryPlanLogging && QUERY_PLAN_LOG.IsInfoEnabled) {
QUERY_PLAN_LOG.Info("Exclude-plan-hint combination : false");
}
return false;
}
