public ExprTableIdentNode GetTableIdentNode(StreamTypeService streamTypeService, string unresolvedPropertyName, string streamOrPropertyName)
{
var propertyPrefixed = unresolvedPropertyName;
if (streamOrPropertyName != null)
{
propertyPrefixed = streamOrPropertyName + "." + unresolvedPropertyName;
}
var col = FindTableColumnMayByPrefixed(streamTypeService, propertyPrefixed);
if (col == null)
{
return(null);
}
var pair = col.Pair;
if (pair.Column is TableMetadataColumnAggregation)
{
var agg = (TableMetadataColumnAggregation)pair.Column;
var node = new ExprTableIdentNode(streamOrPropertyName, unresolvedPropertyName);
var eval = ExprTableEvalStrategyFactory.GetTableAccessEvalStrategy(node, pair.TableMetadata.TableName, pair.StreamNum, agg);
node.Eval = eval;
return(node);
}
return(null);
}
public Pair <ExprNode, IList <ExprChainedSpec> > GetTableNodeChainable(
StreamTypeService streamTypeService,
IList <ExprChainedSpec> chainSpec,
EngineImportService engineImportService)
{
chainSpec = new List <ExprChainedSpec>(chainSpec);
var unresolvedPropertyName = chainSpec[0].Name;
var col = FindTableColumnMayByPrefixed(streamTypeService, unresolvedPropertyName);
if (col == null)
{
return(null);
}
var pair = col.Pair;
if (pair.Column is TableMetadataColumnAggregation)
{
var agg = (TableMetadataColumnAggregation)pair.Column;
if (chainSpec.Count > 1)
{
var candidateAccessor = chainSpec[1].Name;
var exprNode = (ExprAggregateNodeBase)ASTAggregationHelper.TryResolveAsAggregation(engineImportService, false, candidateAccessor, new LazyAllocatedMap <ConfigurationPlugInAggregationMultiFunction, PlugInAggregationMultiFunctionFactory>(), streamTypeService.EngineURIQualifier);
if (exprNode != null)
{
var identNode = new ExprTableIdentNodeSubpropAccessor(pair.StreamNum, col.OptionalStreamName, agg, exprNode);
exprNode.AddChildNodes(chainSpec[1].Parameters);
chainSpec.RemoveAt(0);
chainSpec.RemoveAt(0);
return(new Pair <ExprNode, IList <ExprChainedSpec> >(identNode, chainSpec));
}
}
var node = new ExprTableIdentNode(null, unresolvedPropertyName);
var eval = ExprTableEvalStrategyFactory.GetTableAccessEvalStrategy(node, pair.TableMetadata.TableName, pair.StreamNum, agg);
node.Eval = eval;
chainSpec.RemoveAt(0);
return(new Pair <ExprNode, IList <ExprChainedSpec> >(node, chainSpec));
}
return(null);
}
public static IDictionary <ExprTableAccessNode, ExprTableAccessEvalStrategy> AttachTableAccess(
EPServicesContext services,
AgentInstanceContext agentInstanceContext,
ExprTableAccessNode[] tableNodes)
{
if (tableNodes == null || tableNodes.Length == 0)
{
return(Collections.GetEmptyMap <ExprTableAccessNode, ExprTableAccessEvalStrategy>());
}
IDictionary <ExprTableAccessNode, ExprTableAccessEvalStrategy> strategies =
new Dictionary <ExprTableAccessNode, ExprTableAccessEvalStrategy>();
foreach (var tableNode in tableNodes)
{
var state = services.TableService.GetState(tableNode.TableName, agentInstanceContext.AgentInstanceId);
var tableMetadata = services.TableService.GetTableMetadata(tableNode.TableName);
var strategy = ExprTableEvalStrategyFactory.GetTableAccessEvalStrategy(agentInstanceContext.StatementContext.IsWritesToTables, tableNode, state, tableMetadata);
strategies.Put(tableNode, strategy);
}
return(strategies);
}