public void QPatternObserverStart(
EvalObserverFactoryNode evalObserverNode,
MatchedEventMap beginState)
{
}
public void QPatternObserverEvaluateTrue(
EvalObserverFactoryNode evalObserverNode,
MatchedEventMap matchEvent)
{
}
public static void WalkStatement(StatementSpecRaw spec, ExprNodeSubselectDeclaredDotVisitor visitor)
{
// Look for expressions with sub-selects in select expression list and filter expression
// Recursively compile the statement within the statement.
foreach (SelectClauseElementRaw raw in spec.SelectClauseSpec.SelectExprList)
{
if (raw is SelectClauseExprRawSpec)
{
SelectClauseExprRawSpec rawExpr = (SelectClauseExprRawSpec)raw;
rawExpr.SelectExpression.Accept(visitor);
}
else
{
continue;
}
}
if (spec.FilterRootNode != null)
{
spec.FilterRootNode.Accept(visitor);
}
if (spec.HavingExprRootNode != null)
{
spec.HavingExprRootNode.Accept(visitor);
}
if (spec.UpdateDesc != null)
{
if (spec.UpdateDesc.OptionalWhereClause != null)
{
spec.UpdateDesc.OptionalWhereClause.Accept(visitor);
}
foreach (OnTriggerSetAssignment assignment in spec.UpdateDesc.Assignments)
{
assignment.Expression.Accept(visitor);
}
}
if (spec.OnTriggerDesc != null)
{
VisitSubselectOnTrigger(spec.OnTriggerDesc, visitor);
}
// Determine pattern-filter subqueries
foreach (StreamSpecRaw streamSpecRaw in spec.StreamSpecs)
{
if (streamSpecRaw is PatternStreamSpecRaw)
{
PatternStreamSpecRaw patternStreamSpecRaw = (PatternStreamSpecRaw)streamSpecRaw;
EvalNodeAnalysisResult analysisResult = EvalNodeUtil.RecursiveAnalyzeChildNodes(patternStreamSpecRaw.EvalFactoryNode);
foreach (EvalFactoryNode evalNode in analysisResult.ActiveNodes)
{
if (evalNode is EvalFilterFactoryNode)
{
EvalFilterFactoryNode filterNode = (EvalFilterFactoryNode)evalNode;
foreach (ExprNode filterExpr in filterNode.RawFilterSpec.FilterExpressions)
{
filterExpr.Accept(visitor);
}
}
else if (evalNode is EvalObserverFactoryNode)
{
int beforeCount = visitor.Subselects.Count;
EvalObserverFactoryNode observerNode = (EvalObserverFactoryNode)evalNode;
foreach (ExprNode param in observerNode.PatternObserverSpec.ObjectParameters)
{
param.Accept(visitor);
}
if (visitor.Subselects.Count != beforeCount)
{
throw new ExprValidationException("Subselects are not allowed within pattern observer parameters, please consider using a variable instead");
}
}
}
}
}
// walk streams
WalkStreamSpecs(spec, visitor);
}
public void QPatternObserverQuit(EvalObserverFactoryNode evalObserverNode)
{
}
public void Visit(EvalObserverFactoryNode observer)
{
ProcObserverFactoryNode?.Invoke(observer);
}