private bool IsEventProviding(
ExprNode parameter,
ExprValidationContext validationContext)
{
if (parameter is ExprEnumerationForgeProvider) {
ExprEnumerationForgeProvider provider = (ExprEnumerationForgeProvider) parameter;
ExprEnumerationForgeDesc desc = provider.GetEnumerationForge(
validationContext.StreamTypeService,
validationContext.ContextDescriptor);
EventType eventType = desc?.Forge.GetEventTypeSingle(validationContext.StatementRawInfo, validationContext.StatementCompileTimeService);
return eventType != null;
}
ExprForge forge = parameter.Forge;
ExprEnumerationForge enumerationForge = forge as ExprEnumerationForge;
return enumerationForge?.GetEventTypeSingle(
validationContext.StatementRawInfo, validationContext.StatementCompileTimeService) != null;
}
public override ExprNode Validate(ExprValidationContext validationContext)
{
this.exprValidationContext = validationContext;
var prototype = PrototypeWVisibility;
if (prototype.IsAlias) {
if (!ChainParameters.IsEmpty()) {
throw new ExprValidationException("Expression '" + prototype.Name + " is an expression-alias and does not allow parameters");
}
try {
ExpressionBodyCopy = ExprNodeUtilityValidate.GetValidatedSubtree(
ExprNodeOrigin.ALIASEXPRBODY,
ExpressionBodyCopy,
validationContext);
}
catch (ExprValidationException ex) {
var message = "Failed to validate expression alias '" + prototype.Name + "': " + ex.Message;
throw new ExprValidationException(message, ex);
}
forge = ExpressionBodyCopy.Forge;
return null;
}
if (forge != null) {
return null; // already evaluated
}
if (ChildNodes.Length > 0) {
throw new IllegalStateException("Execution node has its own child nodes");
}
// validate chain
IList<ExprNode> validated = new List<ExprNode>();
foreach (var expr in ChainParameters) {
validated.Add(
ExprNodeUtilityValidate.GetValidatedSubtree(
ExprNodeOrigin.DECLAREDEXPRPARAM,
expr,
validationContext));
}
ChainParameters = validated;
// validate parameter count
CheckParameterCount();
// collect event and value (non-event) parameters
List<int> valueParameters = new List<int>();
List<int> eventParameters = new List<int>();
for (int i = 0; i < prototype.ParametersNames.Length; i++) {
ExprNode parameter = ChainParameters[i];
if (parameter is ExprWildcard) {
if (validationContext.StreamTypeService.EventTypes.Length != 1) {
throw new ExprValidationException("Expression '" + prototype.Name + "' only allows a wildcard parameter if there is a single stream available, please use a stream or tag name instead");
}
}
if (IsEventProviding(parameter, validationContext)) {
eventParameters.Add(i);
} else {
valueParameters.Add(i);
}
}
// determine value event type for holding non-event parameter values, if any
ObjectArrayEventType valueEventType = null;
List<ExprNode> valueExpressions = new List<ExprNode>(valueParameters.Count);
if (!valueParameters.IsEmpty()) {
var valuePropertyTypes = new LinkedHashMap<string, object>();
foreach (int index in valueParameters) {
String name = prototype.ParametersNames[index];
ExprNode expr = ChainParameters[index];
var result = Boxing.GetBoxedType(expr.Forge.EvaluationType);
valuePropertyTypes.Put(name, result);
valueExpressions.Add(expr);
}
valueEventType = ExprDotNodeUtility.MakeTransientOAType(
PrototypeWVisibility.Name,
valuePropertyTypes,
validationContext.StatementRawInfo,
validationContext.StatementCompileTimeService);
}
// create context for expression body
int numEventTypes = eventParameters.Count + (valueEventType == null ? 0 : 1);
EventType[] eventTypes = new EventType[numEventTypes];
String[] streamNames = new String[numEventTypes];
bool[] isIStreamOnly = new bool[numEventTypes];
ExprEnumerationForge[] eventEnumerationForges = new ExprEnumerationForge[numEventTypes];
allStreamIdsMatch = true;
int offsetEventType = 0;
if (valueEventType != null) {
offsetEventType = 1;
eventTypes[0] = valueEventType;
streamNames[0] = INTERNAL_VALUE_STREAMNAME;
isIStreamOnly[0] = true;
allStreamIdsMatch = false;
}
bool forceOptionalStream = false;
foreach (int index in eventParameters) {
ExprNode parameter = ChainParameters[index];
streamNames[offsetEventType] = prototype.ParametersNames[index];
int streamId;
bool istreamOnlyFlag;
ExprEnumerationForge forge;
if (parameter is ExprEnumerationForgeProvider) {
ExprEnumerationForgeProvider enumerationForgeProvider = (ExprEnumerationForgeProvider) parameter;
ExprEnumerationForgeDesc desc = enumerationForgeProvider.GetEnumerationForge(
validationContext.StreamTypeService, validationContext.ContextDescriptor);
forge = desc.Forge;
streamId = desc.DirectIndexStreamNumber;
istreamOnlyFlag = desc.IsIstreamOnly;
} else {
forge = (ExprEnumerationForge) parameter.Forge;
istreamOnlyFlag = false;
streamId = -1;
forceOptionalStream = true; // since they may return null, i.e. subquery returning no row or multiple rows etc.
}
isIStreamOnly[offsetEventType] = istreamOnlyFlag;
eventEnumerationForges[offsetEventType] = forge;
eventTypes[offsetEventType] = forge.GetEventTypeSingle(validationContext.StatementRawInfo, validationContext.StatementCompileTimeService);
if (streamId != index) {
allStreamIdsMatch = false;
}
offsetEventType++;
}
var streamTypeService = validationContext.StreamTypeService;
var optionalStream = forceOptionalStream || streamTypeService.IsOptionalStreams;
var copyTypes = new StreamTypeServiceImpl(
eventTypes,
streamNames,
isIStreamOnly,
streamTypeService.IsOnDemandStreams,
optionalStream);
copyTypes.RequireStreamNames = true;
// validate expression body in this context
try {
var expressionBodyContext = new ExprValidationContext(copyTypes, validationContext);
ExpressionBodyCopy = ExprNodeUtilityValidate.GetValidatedSubtree(
ExprNodeOrigin.DECLAREDEXPRBODY,
ExpressionBodyCopy,
expressionBodyContext);
}
catch (ExprValidationException ex) {
var message = "Failed to validate expression declaration '" + prototype.Name + "': " + ex.Message;
throw new ExprValidationException(message, ex);
}
// analyze child node
var summaryVisitor = new ExprNodeSummaryVisitor();
ExpressionBodyCopy.Accept(summaryVisitor);
var isCache = !(summaryVisitor.HasAggregation || summaryVisitor.HasPreviousPrior);
isCache &= validationContext.StatementCompileTimeService.Configuration.Compiler.Execution
.IsEnabledDeclaredExprValueCache;
// determine a suitable evaluation
var audit = AuditEnum.EXPRDEF.GetAudit(validationContext.Annotations) != null;
var statementName = validationContext.StatementName;
if (ExpressionBodyCopy.Forge.ForgeConstantType.IsConstant) {
// pre-evaluated
forge = new ExprDeclaredForgeConstant(
this,
ExpressionBodyCopy.Forge.EvaluationType,
prototype,
ExpressionBodyCopy.Forge.ExprEvaluator.Evaluate(null, true, null),
audit,
statementName);
}
else if (valueEventType == null &&
prototype.ParametersNames.Length == 0 ||
allStreamIdsMatch && prototype.ParametersNames.Length == streamTypeService.EventTypes.Length) {
forge = new ExprDeclaredForgeNoRewrite(
this, ExpressionBodyCopy.Forge, isCache, audit, statementName);
}
else if (valueEventType == null) {
forge = new ExprDeclaredForgeRewrite(
this, ExpressionBodyCopy.Forge, isCache, eventEnumerationForges, audit, statementName);
}
else {
// cache is always false
forge = new ExprDeclaredForgeRewriteWValue(
this, ExpressionBodyCopy.Forge, false, audit, statementName, eventEnumerationForges, valueEventType, valueExpressions);
}
return null;
}
