public static SelectClauseSpecCompiled CompileSelectClause(SelectClauseSpecRaw spec)
{
IList <SelectClauseElementCompiled> selectElements = new List <SelectClauseElementCompiled>();
foreach (SelectClauseElementRaw raw in spec.SelectExprList)
{
if (raw is SelectClauseExprRawSpec)
{
SelectClauseExprRawSpec rawExpr = (SelectClauseExprRawSpec)raw;
selectElements.Add(new SelectClauseExprCompiledSpec(rawExpr.SelectExpression, rawExpr.OptionalAsName, rawExpr.OptionalAsName, rawExpr.IsEvents));
}
else if (raw is SelectClauseStreamRawSpec)
{
SelectClauseStreamRawSpec rawExpr = (SelectClauseStreamRawSpec)raw;
selectElements.Add(new SelectClauseStreamCompiledSpec(rawExpr.StreamName, rawExpr.OptionalAsName));
}
else if (raw is SelectClauseElementWildcard)
{
SelectClauseElementWildcard wildcard = (SelectClauseElementWildcard)raw;
selectElements.Add(wildcard);
}
else
{
throw new IllegalStateException("Unexpected select clause element class : " + raw.GetType().FullName);
}
}
return(new SelectClauseSpecCompiled(selectElements.ToArray(), spec.IsDistinct));
}
private static void WalkSubselectSelectClause(
IList<SelectClauseElementRaw> selectClause,
ExprNodeSubselectDeclaredDotVisitor visitor)
{
foreach (SelectClauseElementRaw element in selectClause) {
if (element is SelectClauseExprRawSpec) {
SelectClauseExprRawSpec selectExpr = (SelectClauseExprRawSpec) element;
selectExpr.SelectExpression.Accept(visitor);
}
}
}
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);
}
private static void VisitSubselectOnTrigger(OnTriggerDesc onTriggerDesc, ExprNodeSubselectDeclaredDotVisitor visitor)
{
if (onTriggerDesc is OnTriggerWindowUpdateDesc)
{
OnTriggerWindowUpdateDesc updates = (OnTriggerWindowUpdateDesc)onTriggerDesc;
foreach (OnTriggerSetAssignment assignment in updates.Assignments)
{
assignment.Expression.Accept(visitor);
}
}
else if (onTriggerDesc is OnTriggerSetDesc)
{
OnTriggerSetDesc sets = (OnTriggerSetDesc)onTriggerDesc;
foreach (OnTriggerSetAssignment assignment in sets.Assignments)
{
assignment.Expression.Accept(visitor);
}
}
else if (onTriggerDesc is OnTriggerSplitStreamDesc)
{
OnTriggerSplitStreamDesc splits = (OnTriggerSplitStreamDesc)onTriggerDesc;
foreach (OnTriggerSplitStream split in splits.SplitStreams)
{
if (split.WhereClause != null)
{
split.WhereClause.Accept(visitor);
}
if (split.SelectClause.SelectExprList != null)
{
foreach (SelectClauseElementRaw element in split.SelectClause.SelectExprList)
{
if (element is SelectClauseExprRawSpec)
{
SelectClauseExprRawSpec selectExpr = (SelectClauseExprRawSpec)element;
selectExpr.SelectExpression.Accept(visitor);
}
}
}
}
}
else if (onTriggerDesc is OnTriggerMergeDesc)
{
OnTriggerMergeDesc merge = (OnTriggerMergeDesc)onTriggerDesc;
foreach (OnTriggerMergeMatched matched in merge.Items)
{
if (matched.OptionalMatchCond != null)
{
matched.OptionalMatchCond.Accept(visitor);
}
foreach (OnTriggerMergeAction action in matched.Actions)
{
if (action.OptionalWhereClause != null)
{
action.OptionalWhereClause.Accept(visitor);
}
if (action is OnTriggerMergeActionUpdate)
{
OnTriggerMergeActionUpdate update = (OnTriggerMergeActionUpdate)action;
foreach (OnTriggerSetAssignment assignment in update.Assignments)
{
assignment.Expression.Accept(visitor);
}
}
if (action is OnTriggerMergeActionInsert)
{
OnTriggerMergeActionInsert insert = (OnTriggerMergeActionInsert)action;
foreach (SelectClauseElementRaw element in insert.SelectClause)
{
if (element is SelectClauseExprRawSpec)
{
SelectClauseExprRawSpec selectExpr = (SelectClauseExprRawSpec)element;
selectExpr.SelectExpression.Accept(visitor);
}
}
}
}
}
}
}