public override ExprNode Validate(ExprValidationContext validationContext)
{
// rewrite expression into a table-access expression
if (validationContext.StreamTypeService.HasTableTypes)
{
ExprTableIdentNode tableIdentNode = validationContext.TableService.GetTableIdentNode(validationContext.StreamTypeService, _unresolvedPropertyName, _streamOrPropertyName);
if (tableIdentNode != null)
{
return(tableIdentNode);
}
}
string unescapedPropertyName = PropertyParser.UnescapeBacktick(_unresolvedPropertyName);
Pair <PropertyResolutionDescriptor, string> propertyInfoPair = ExprIdentNodeUtil.GetTypeFromStream(validationContext.StreamTypeService, unescapedPropertyName, _streamOrPropertyName, false);
_resolvedStreamName = propertyInfoPair.Second;
int streamNum = propertyInfoPair.First.StreamNum;
Type propertyType = propertyInfoPair.First.PropertyType;
_resolvedPropertyName = propertyInfoPair.First.PropertyName;
EventPropertyGetter propertyGetter;
try {
propertyGetter = propertyInfoPair.First.StreamEventType.GetGetter(_resolvedPropertyName);
}
catch (PropertyAccessException ex) {
throw new ExprValidationException("Property '" + _unresolvedPropertyName + "' is not valid: " + ex.Message, ex);
}
if (propertyGetter == null)
{
throw new ExprValidationException("Property getter returned was invalid for property '" + _unresolvedPropertyName + "'");
}
var audit = AuditEnum.PROPERTY.GetAudit(validationContext.Annotations);
if (audit != null)
{
_evaluator = new ExprIdentNodeEvaluatorLogging(streamNum, propertyGetter, propertyType, this, _resolvedPropertyName, validationContext.StatementName, validationContext.StreamTypeService.EngineURIQualifier);
}
else
{
_evaluator = new ExprIdentNodeEvaluatorImpl(streamNum, propertyGetter, propertyType, this);
}
// if running in a context, take the property value from context
if (validationContext.ContextDescriptor != null && !validationContext.IsFilterExpression)
{
EventType fromType = validationContext.StreamTypeService.EventTypes[streamNum];
string contextPropertyName = validationContext.ContextDescriptor.ContextPropertyRegistry.GetPartitionContextPropertyName(fromType, _resolvedPropertyName);
if (contextPropertyName != null)
{
EventType contextType = validationContext.ContextDescriptor.ContextPropertyRegistry.ContextEventType;
_evaluator = new ExprIdentNodeEvaluatorContext(streamNum, contextType.GetPropertyType(contextPropertyName), contextType.GetGetter(contextPropertyName));
}
}
return(null);
}
public static void ToPrecedenceFreeEPL(TextWriter writer, string streamOrPropertyName, string unresolvedPropertyName)
{
if (streamOrPropertyName != null)
{
writer.Write(ASTUtil.UnescapeDot(streamOrPropertyName));
writer.Write('.');
}
writer.Write(ASTUtil.UnescapeDot(PropertyParser.UnescapeBacktick(unresolvedPropertyName)));
}
