public static ExprNode ProcessDot( bool useChainAsIs, bool resolveObjects, IList <Chainable> chain, StatementSpecMapContext mapContext) { if (chain.IsEmpty()) { throw new ArgumentException("Empty chain"); } Func <IList <Chainable>, ExprDotNodeImpl> dotNodeFunction = chainSpec => { var dotNode = new ExprDotNodeImpl( chainSpec, mapContext.Configuration.Compiler.Expression.IsDuckTyping, mapContext.Configuration.Compiler.Expression.IsUdfCache); // add any variables that are referenced var variable = dotNode.IsVariableOpGetName(mapContext.VariableCompileTimeResolver); if (variable != null) { mapContext.VariableNames.Add(variable.VariableName); } return(dotNode); }; // Resolve objects if required if (resolveObjects) { var resolved = ResolveObject(chain, mapContext, dotNodeFunction); if (resolved != null) { return(resolved); } } // Check if we are dealing with a plain event property expression, i.e. one without any eventstream-dependent expression var plain = DeterminePlainProperty(chain); if (plain) { return(HandlePlain(chain, dotNodeFunction, useChainAsIs)); } return(HandleNonPlain(chain, dotNodeFunction)); }
public static void HandleLibFunc( CommonTokenStream tokenStream, EsperEPL2GrammarParser.LibFunctionContext ctx, ConfigurationInformation configurationInformation, EngineImportService engineImportService, IDictionary <ITree, ExprNode> astExprNodeMap, LazyAllocatedMap <ConfigurationPlugInAggregationMultiFunction, PlugInAggregationMultiFunctionFactory> plugInAggregations, string engineURI, ExpressionDeclDesc expressionDeclarations, ExprDeclaredService exprDeclaredService, IList <ExpressionScriptProvided> scriptExpressions, ContextDescriptor contextDescriptor, TableService tableService, StatementSpecRaw statementSpec, VariableService variableService) { var model = GetModel(ctx, tokenStream); var duckType = configurationInformation.EngineDefaults.Expression.IsDuckTyping; var udfCache = configurationInformation.EngineDefaults.Expression.IsUdfCache; // handle "some.Xyz(...)" or "some.other.Xyz(...)" if (model.ChainElements.Count == 1 && model.OptionalClassIdent != null && ASTTableExprHelper.CheckTableNameGetExprForProperty(tableService, model.OptionalClassIdent) == null) { var chainSpec = GetLibFunctionChainSpec(model.ChainElements[0], astExprNodeMap); var declaredNodeX = ExprDeclaredHelper.GetExistsDeclaredExpr( model.OptionalClassIdent, Collections.GetEmptyList <ExprNode>(), expressionDeclarations.Expressions, exprDeclaredService, contextDescriptor); if (declaredNodeX != null) { var exprNode = new ExprDotNodeImpl(Collections.SingletonList(chainSpec), duckType, udfCache); exprNode.AddChildNode(declaredNodeX); ASTExprHelper.ExprCollectAddSubNodesAddParentNode(exprNode, ctx, astExprNodeMap); return; } var chainX = new List <ExprChainedSpec>(2); chainX.Add(new ExprChainedSpec(model.OptionalClassIdent, Collections.GetEmptyList <ExprNode>(), true)); chainX.Add(chainSpec); var dotNodeX = new ExprDotNodeImpl( chainX, configurationInformation.EngineDefaults.Expression.IsDuckTyping, configurationInformation.EngineDefaults.Expression.IsUdfCache); if (dotNodeX.IsVariableOpGetName(variableService) != null) { statementSpec.HasVariables = true; } ASTExprHelper.ExprCollectAddSubNodesAddParentNode(dotNodeX, ctx, astExprNodeMap); return; } // try additional built-in single-row function var singleRowExtNode = engineImportService.ResolveSingleRowExtendedBuiltin(model.ChainElements[0].FuncName); if (singleRowExtNode != null) { if (model.ChainElements.Count == 1) { ASTExprHelper.ExprCollectAddSubNodesAddParentNode(singleRowExtNode, ctx, astExprNodeMap); return; } var spec = new List <ExprChainedSpec>(); var firstArgs = model.ChainElements[0].Args; var childExpressions = GetExprNodesLibFunc(firstArgs, astExprNodeMap); singleRowExtNode.AddChildNodes(childExpressions); AddChainRemainderFromOffset(model.ChainElements, 1, spec, astExprNodeMap); var dotNodeX = new ExprDotNodeImpl( spec, configurationInformation.EngineDefaults.Expression.IsDuckTyping, configurationInformation.EngineDefaults.Expression.IsUdfCache); dotNodeX.AddChildNode(singleRowExtNode); ASTExprHelper.ExprCollectAddSubNodesAddParentNode(dotNodeX, ctx, astExprNodeMap); return; } // try plug-in single-row function try { var firstFunctionX = model.ChainElements[0].FuncName; var firstFunctionIsProperty = !model.ChainElements[0].HasLeftParen; var classMethodPair = engineImportService.ResolveSingleRow(firstFunctionX); var spec = new List <ExprChainedSpec>(); var firstArgs = model.ChainElements[0].Args; var childExpressions = GetExprNodesLibFunc(firstArgs, astExprNodeMap); spec.Add( new ExprChainedSpec(classMethodPair.Second.MethodName, childExpressions, firstFunctionIsProperty)); AddChainRemainderFromOffset(model.ChainElements, 1, spec, astExprNodeMap); var plugin = new ExprPlugInSingleRowNode( firstFunctionX, classMethodPair.First, spec, classMethodPair.Second); ASTExprHelper.ExprCollectAddSubNodesAddParentNode(plugin, ctx, astExprNodeMap); return; } catch (EngineImportUndefinedException) { // Not an single-row function } catch (EngineImportException e) { throw new IllegalStateException("Error resolving single-row function: " + e.Message, e); } // special case for min,max var firstFunction = model.ChainElements[0].FuncName; if ((firstFunction.ToLowerInvariant().Equals("max")) || (firstFunction.ToLowerInvariant().Equals("min")) || (firstFunction.ToLowerInvariant().Equals("fmax")) || (firstFunction.ToLowerInvariant().Equals("fmin"))) { var firstArgs = model.ChainElements[0].Args; HandleMinMax(firstFunction, firstArgs, astExprNodeMap); return; } // obtain chain with actual expressions IList <ExprChainedSpec> chain = new List <ExprChainedSpec>(); AddChainRemainderFromOffset(model.ChainElements, 0, chain, astExprNodeMap); // add chain element for class INFO, if any var distinct = model.ChainElements[0].Args != null && model.ChainElements[0].Args.DISTINCT() != null; if (model.OptionalClassIdent != null) { chain.Insert( 0, new ExprChainedSpec(model.OptionalClassIdent, Collections.GetEmptyList <ExprNode>(), true)); distinct = false; } firstFunction = chain[0].Name; // try plug-in aggregation function var aggregationNode = ASTAggregationHelper.TryResolveAsAggregation( engineImportService, distinct, firstFunction, plugInAggregations, engineURI); if (aggregationNode != null) { var firstSpec = chain.DeleteAt(0); aggregationNode.AddChildNodes(firstSpec.Parameters); ExprNode exprNode; if (chain.IsEmpty()) { exprNode = aggregationNode; } else { exprNode = new ExprDotNodeImpl(chain, duckType, udfCache); exprNode.AddChildNode(aggregationNode); } ASTExprHelper.ExprCollectAddSubNodesAddParentNode(exprNode, ctx, astExprNodeMap); return; } // try declared or alias expression var declaredNode = ExprDeclaredHelper.GetExistsDeclaredExpr( firstFunction, chain[0].Parameters, expressionDeclarations.Expressions, exprDeclaredService, contextDescriptor); if (declaredNode != null) { chain.RemoveAt(0); ExprNode exprNode; if (chain.IsEmpty()) { exprNode = declaredNode; } else { exprNode = new ExprDotNodeImpl(chain, duckType, udfCache); exprNode.AddChildNode(declaredNode); } ASTExprHelper.ExprCollectAddSubNodesAddParentNode(exprNode, ctx, astExprNodeMap); return; } // try script var scriptNode = ExprDeclaredHelper.GetExistsScript( configurationInformation.EngineDefaults.Scripts.DefaultDialect, chain[0].Name, chain[0].Parameters, scriptExpressions, exprDeclaredService); if (scriptNode != null) { chain.RemoveAt(0); ExprNode exprNode; if (chain.IsEmpty()) { exprNode = scriptNode; } else { exprNode = new ExprDotNodeImpl(chain, duckType, udfCache); exprNode.AddChildNode(scriptNode); } ASTExprHelper.ExprCollectAddSubNodesAddParentNode(exprNode, ctx, astExprNodeMap); return; } // try table var tableInfo = ASTTableExprHelper.CheckTableNameGetLibFunc( tableService, engineImportService, plugInAggregations, engineURI, firstFunction, chain); if (tableInfo != null) { ASTTableExprHelper.AddTableExpressionReference(statementSpec, tableInfo.First); chain = tableInfo.Second; ExprNode exprNode; if (chain.IsEmpty()) { exprNode = tableInfo.First; } else { exprNode = new ExprDotNodeImpl(chain, duckType, udfCache); exprNode.AddChildNode(tableInfo.First); } ASTExprHelper.ExprCollectAddSubNodesAddParentNode(exprNode, ctx, astExprNodeMap); return; } // Could be a mapped property with an expression-parameter "Mapped(expr)" or array property with an expression-parameter "Array(expr)". ExprDotNode dotNode; if (chain.Count == 1) { dotNode = new ExprDotNodeImpl(chain, false, false); } else { dotNode = new ExprDotNodeImpl(chain, duckType, udfCache); } ASTExprHelper.ExprCollectAddSubNodesAddParentNode(dotNode, ctx, astExprNodeMap); }