private static string GetErrorPrefix(AggregationStateType stateType)
{
return ExprAggMultiFunctionUtil.GetErrorPrefix(stateType.ToString().ToLowerInvariant());
}
public override void ToPrecedenceFreeEPL(TextWriter writer)
{
writer.Write(_stateType.ToString().ToLower());
ExprNodeUtility.ToExpressionStringParams(writer, this.ChildNodes);
}
private LinearAggregationFactoryDesc HandleNonIntoTable(
ExprNode[] childNodes,
AggregationStateType stateType,
ExprValidationContext validationContext)
{
var streamTypeService = validationContext.StreamTypeService;
int streamNum;
Type resultType;
ExprEvaluator evaluator;
ExprNode evaluatorIndex = null;
bool istreamOnly;
EventType containedType;
Type scalarCollectionComponentType = null;
// validate wildcard use
var isWildcard = childNodes.Length == 0 || childNodes.Length > 0 && childNodes[0] is ExprWildcard;
if (isWildcard)
{
ExprAggMultiFunctionUtil.ValidateWildcardStreamNumbers(
validationContext.StreamTypeService, stateType.ToString().ToLowerInvariant());
streamNum = 0;
containedType = streamTypeService.EventTypes[0];
resultType = containedType.UnderlyingType;
var tableMetadata = validationContext.TableService.GetTableMetadataFromEventType(containedType);
evaluator = ExprNodeUtility.MakeUnderlyingEvaluator(0, resultType, tableMetadata);
istreamOnly = GetIstreamOnly(streamTypeService, 0);
if (stateType == AggregationStateType.WINDOW && istreamOnly && !streamTypeService.IsOnDemandStreams)
throw MakeUnboundValidationEx(stateType);
}
else if (childNodes.Length > 0 && childNodes[0] is ExprStreamUnderlyingNode)
{
// validate "stream.*"
streamNum = ExprAggMultiFunctionUtil.ValidateStreamWildcardGetStreamNum(childNodes[0]);
istreamOnly = GetIstreamOnly(streamTypeService, streamNum);
if (stateType == AggregationStateType.WINDOW && istreamOnly && !streamTypeService.IsOnDemandStreams)
throw MakeUnboundValidationEx(stateType);
var type = streamTypeService.EventTypes[streamNum];
containedType = type;
resultType = type.UnderlyingType;
var tableMetadata = validationContext.TableService.GetTableMetadataFromEventType(type);
evaluator = ExprNodeUtility.MakeUnderlyingEvaluator(streamNum, resultType, tableMetadata);
}
else
{
// validate when neither wildcard nor "stream.*"
var child = childNodes[0];
var streams = ExprNodeUtility.GetIdentStreamNumbers(child);
if (streams.IsEmpty() || streams.Count > 1)
throw new ExprValidationException(GetErrorPrefix(stateType) +
" requires that any child expressions evaluate properties of the same stream; Use 'firstever' or 'lastever' or 'nth' instead");
streamNum = streams.First();
istreamOnly = GetIstreamOnly(streamTypeService, streamNum);
if (stateType == AggregationStateType.WINDOW && istreamOnly && !streamTypeService.IsOnDemandStreams)
throw MakeUnboundValidationEx(stateType);
resultType = childNodes[0].ExprEvaluator.ReturnType;
evaluator = childNodes[0].ExprEvaluator;
if (streamNum >= streamTypeService.EventTypes.Length)
containedType = streamTypeService.EventTypes[0];
else
containedType = streamTypeService.EventTypes[streamNum];
scalarCollectionComponentType = resultType;
}
if (childNodes.Length > 1)
{
if (stateType == AggregationStateType.WINDOW)
throw new ExprValidationException(GetErrorPrefix(stateType) +
" does not accept an index expression; Use 'first' or 'last' instead");
evaluatorIndex = childNodes[1];
if (!evaluatorIndex.ExprEvaluator.ReturnType.IsInt32()) {
throw new ExprValidationException(
GetErrorPrefix(stateType) +
" requires an index expression that returns an integer value");
}
}
// determine accessor
AggregationAccessor accessor;
if (evaluatorIndex != null)
{
var isFirst = stateType == AggregationStateType.FIRST;
var constant = -1;
if (evaluatorIndex.IsConstantResult)
constant = evaluatorIndex.ExprEvaluator.Evaluate(EvaluateParams.EmptyTrue).AsInt();
accessor = new AggregationAccessorFirstLastIndexWEval(streamNum, evaluator,
evaluatorIndex.ExprEvaluator, constant, isFirst);
}
else
{
if (stateType == AggregationStateType.FIRST)
accessor = new AggregationAccessorFirstWEval(streamNum, evaluator);
else if (stateType == AggregationStateType.LAST)
accessor = new AggregationAccessorLastWEval(streamNum, evaluator);
else if (stateType == AggregationStateType.WINDOW)
accessor = new AggregationAccessorWindowWEval(streamNum, evaluator, resultType);
else
throw new IllegalStateException("Access type is undefined or not known as code '" + stateType +
"'");
}
var accessorResultType = resultType;
if (stateType == AggregationStateType.WINDOW) accessorResultType = TypeHelper.GetArrayType(resultType);
var isFafWindow = streamTypeService.IsOnDemandStreams && stateType == AggregationStateType.WINDOW;
var tableMetadataX = validationContext.TableService.GetTableMetadataFromEventType(containedType);
var optionalFilter = OptionalFilter;
if (tableMetadataX == null && !isFafWindow && (istreamOnly || streamTypeService.IsOnDemandStreams))
{
if (optionalFilter != null)
PositionalParams = ExprNodeUtility.AddExpression(PositionalParams, optionalFilter);
var factory = validationContext.EngineImportService.AggregationFactoryFactory.MakeLinearUnbounded(
validationContext.StatementExtensionSvcContext, this, containedType, accessorResultType, streamNum,
optionalFilter != null);
return new LinearAggregationFactoryDesc(factory, containedType, scalarCollectionComponentType);
}
var stateKey = new AggregationStateKeyWStream(
streamNum, containedType,
AggregationStateTypeWStream.DATAWINDOWACCESS_LINEAR,
new ExprNode[0], optionalFilter);
var optionalFilterEval = optionalFilter?.ExprEvaluator;
var stateFactory = validationContext.EngineImportService.AggregationFactoryFactory.MakeLinear(
validationContext.StatementExtensionSvcContext, this, streamNum, optionalFilterEval);
var factoryX = new ExprAggMultiFunctionLinearAccessNodeFactoryAccess(this, accessor, accessorResultType,
containedType,
stateKey, stateFactory, AggregationAgentDefault.INSTANCE);
var enumerationType = scalarCollectionComponentType == null ? containedType : null;
return new LinearAggregationFactoryDesc(factoryX, enumerationType, scalarCollectionComponentType);
}
private LinearAggregationFactoryDesc HandleNonIntoTable(ExprNode[] childNodes, AggregationStateType stateType, ExprValidationContext validationContext)
{
var streamTypeService = validationContext.StreamTypeService;
int streamNum;
Type resultType;
ExprEvaluator evaluator;
ExprNode evaluatorIndex = null;
bool istreamOnly;
EventType containedType;
Type scalarCollectionComponentType = null;
// validate wildcard use
var isWildcard = childNodes.Length == 0 || childNodes.Length > 0 && childNodes[0] is ExprWildcard;
if (isWildcard)
{
ExprAggMultiFunctionUtil.ValidateWildcardStreamNumbers(validationContext.StreamTypeService, stateType.ToString().ToLower());
streamNum = 0;
containedType = streamTypeService.EventTypes[0];
resultType = containedType.UnderlyingType;
TableMetadata tableMetadata = validationContext.TableService.GetTableMetadataFromEventType(containedType);
evaluator = ExprNodeUtility.MakeUnderlyingEvaluator(0, resultType, tableMetadata);
istreamOnly = GetIstreamOnly(streamTypeService, 0);
if ((stateType == AggregationStateType.WINDOW) && istreamOnly && !streamTypeService.IsOnDemandStreams)
{
throw MakeUnboundValidationEx(stateType);
}
}
// validate "stream.*"
else if (childNodes.Length > 0 && childNodes[0] is ExprStreamUnderlyingNode)
{
streamNum = ExprAggMultiFunctionUtil.ValidateStreamWildcardGetStreamNum(childNodes[0]);
istreamOnly = GetIstreamOnly(streamTypeService, streamNum);
if ((stateType == AggregationStateType.WINDOW) && istreamOnly && !streamTypeService.IsOnDemandStreams)
{
throw MakeUnboundValidationEx(stateType);
}
var type = streamTypeService.EventTypes[streamNum];
containedType = type;
resultType = type.UnderlyingType;
TableMetadata tableMetadata = validationContext.TableService.GetTableMetadataFromEventType(type);
evaluator = ExprNodeUtility.MakeUnderlyingEvaluator(streamNum, resultType, tableMetadata);
}
// validate when neither wildcard nor "stream.*"
else
{
var child = childNodes[0];
var streams = ExprNodeUtility.GetIdentStreamNumbers(child);
if ((streams.IsEmpty() || (streams.Count > 1)))
{
throw new ExprValidationException(GetErrorPrefix(stateType) + " requires that any child expressions evaluate properties of the same stream; Use 'firstever' or 'lastever' or 'nth' instead");
}
streamNum = streams.First();
istreamOnly = GetIstreamOnly(streamTypeService, streamNum);
if ((stateType == AggregationStateType.WINDOW) && istreamOnly && !streamTypeService.IsOnDemandStreams)
{
throw MakeUnboundValidationEx(stateType);
}
resultType = childNodes[0].ExprEvaluator.ReturnType;
evaluator = childNodes[0].ExprEvaluator;
if (streamNum >= streamTypeService.EventTypes.Length)
{
containedType = streamTypeService.EventTypes[0];
}
else
{
containedType = streamTypeService.EventTypes[streamNum];
}
scalarCollectionComponentType = resultType;
}
if (childNodes.Length > 1)
{
if (stateType == AggregationStateType.WINDOW)
{
throw new ExprValidationException(GetErrorPrefix(stateType) + " does not accept an index expression; Use 'first' or 'last' instead");
}
evaluatorIndex = childNodes[1];
if (evaluatorIndex.ExprEvaluator.ReturnType != typeof(int?))
{
throw new ExprValidationException(GetErrorPrefix(stateType) + " requires an index expression that returns an integer value");
}
}
// determine accessor
AggregationAccessor accessor;
if (evaluatorIndex != null)
{
var isFirst = stateType == AggregationStateType.FIRST;
var constant = -1;
if (evaluatorIndex.IsConstantResult)
{
constant = evaluatorIndex.ExprEvaluator.Evaluate(new EvaluateParams(null, true, null)).AsInt();
}
accessor = new AggregationAccessorFirstLastIndexWEval(streamNum, evaluator, evaluatorIndex.ExprEvaluator, constant, isFirst);
}
else
{
if (stateType == AggregationStateType.FIRST)
{
accessor = new AggregationAccessorFirstWEval(streamNum, evaluator);
}
else if (stateType == AggregationStateType.LAST)
{
accessor = new AggregationAccessorLastWEval(streamNum, evaluator);
}
else if (stateType == AggregationStateType.WINDOW)
{
accessor = new AggregationAccessorWindowWEval(streamNum, evaluator, resultType);
}
else
{
throw new IllegalStateException("Access type is undefined or not known as code '" + stateType + "'");
}
}
var accessorResultType = resultType;
if (stateType == AggregationStateType.WINDOW)
{
accessorResultType = TypeHelper.GetArrayType(resultType);
}
var isFafWindow = streamTypeService.IsOnDemandStreams && stateType == AggregationStateType.WINDOW;
TableMetadata tableMetadataX = validationContext.TableService.GetTableMetadataFromEventType(containedType);
if (tableMetadataX == null && !isFafWindow && (istreamOnly || streamTypeService.IsOnDemandStreams))
{
var factoryX = new ExprAggMultiFunctionLinearAccessNodeFactoryMethod(this, containedType, accessorResultType, streamNum);
return(new LinearAggregationFactoryDesc(factoryX, containedType, scalarCollectionComponentType));
}
var stateKey = new AggregationStateKeyWStream(streamNum, containedType, AggregationStateTypeWStream.DATAWINDOWACCESS_LINEAR, new ExprNode[0]);
ExprNode me = this;
var theStreamNum = streamNum;
AggregationStateFactory stateFactory = new ProxyAggregationStateFactory
{
ProcCreateAccess = (methodResolutionService, agentInstanceId, groupId, aggregationId, join, groupKey, passThru) =>
{
if (join)
{
return(methodResolutionService.MakeAccessAggLinearJoin(agentInstanceId, groupId, aggregationId, theStreamNum, passThru));
}
return(methodResolutionService.MakeAccessAggLinearNonJoin(agentInstanceId, groupId, aggregationId, theStreamNum, passThru));
},
ProcAggregationExpression = () => me
};
var factory = new ExprAggMultiFunctionLinearAccessNodeFactoryAccess(this, accessor, accessorResultType, containedType,
stateKey, stateFactory, AggregationAgentDefault.INSTANCE);
var enumerationType = scalarCollectionComponentType == null ? containedType : null;
return(new LinearAggregationFactoryDesc(factory, enumerationType, scalarCollectionComponentType));
}