public static ExprNode TryResolveAsAggregation(
EngineImportService engineImportService,
bool distinct,
String functionName,
LazyAllocatedMap <ConfigurationPlugInAggregationMultiFunction, PlugInAggregationMultiFunctionFactory> plugInAggregations,
String engineURI)
{
try
{
AggregationFunctionFactory aggregationFactory = engineImportService.ResolveAggregationFactory(functionName);
return(new ExprPlugInAggNode(distinct, aggregationFactory, functionName));
}
catch (EngineImportUndefinedException)
{
// Not an aggregation function
}
catch (EngineImportException e)
{
throw new IllegalStateException("Error resolving aggregation: " + e.Message, e);
}
// try plug-in aggregation multi-function
ConfigurationPlugInAggregationMultiFunction config =
engineImportService.ResolveAggregationMultiFunction(functionName);
if (config != null)
{
PlugInAggregationMultiFunctionFactory factory = plugInAggregations.Map.Get(config);
if (factory == null)
{
factory = TypeHelper.Instantiate <PlugInAggregationMultiFunctionFactory>(
config.MultiFunctionFactoryClassName);
plugInAggregations.Map.Put(config, factory);
}
factory.AddAggregationFunction(
new PlugInAggregationMultiFunctionDeclarationContext(
functionName.ToLower(), distinct, engineURI, config));
return(new ExprPlugInAggMultiFunctionNode(distinct, config, factory, functionName));
}
// try built-in expanded set of aggregation functions
return(engineImportService.ResolveAggExtendedBuiltin(functionName, distinct));
}
