Package com.espertech.esper.epl.expression

Examples of com.espertech.esper.epl.expression.ExprNode

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        }

        EventType eventType = prepareContext.getInputPorts().get(0).getTypeDesc().getEventType();
        singleOutputPort = prepareContext.getOutputPorts().size() == 1;

        ExprNode validated = ExprNodeUtility.validateSimpleGetSubtree(filter, prepareContext.getStatementContext(), eventType);
        evaluator = validated.getExprEvaluator();
        theEvent = prepareContext.getServicesContext().getEventAdapterService().getShellForType(eventType);
        eventsPerStream[0] = theEvent;

        GraphTypeDesc[] typesPerPort = new GraphTypeDesc[prepareContext.getOutputPorts().size()];
        for (int i = 0; i < typesPerPort.length; i++) {
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                int toStream = substreams[i];

                if (isHistorical[toStream])
                {
                    // There may not be an outer-join descriptor, use if provided to build the associated expression
                    ExprNode outerJoinExpr = null;
                    if (!outerJoinDescList.isEmpty()) {
                        OuterJoinDesc outerJoinDesc;
                        if (toStream == 0)
                        {
                            outerJoinDesc = outerJoinDescList.get(0);
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            }
        }

        // Build an outer join expression node
        boolean isOuterJoin = false;
        ExprNode outerJoinEqualsNode = null;
        if (!outerJoinDescList.isEmpty())
        {
            OuterJoinDesc outerJoinDesc = outerJoinDescList.get(0);
            if (outerJoinDesc.getOuterJoinType().equals(OuterJoinType.FULL))
            {
                isOuterJoin = true;
            }
            else if ((outerJoinDesc.getOuterJoinType().equals(OuterJoinType.LEFT)) &&
                    (streamViewNum == 0))
            {
                    isOuterJoin = true;
            }
            else if ((outerJoinDesc.getOuterJoinType().equals(OuterJoinType.RIGHT)) &&
                    (streamViewNum == 1))
            {
                    isOuterJoin = true;
            }

            outerJoinEqualsNode  = outerJoinDesc.makeExprNode(exprEvaluatorContext);
        }

        // Determine filter for indexing purposes
        ExprNode filterForIndexing = null;
        if ((outerJoinEqualsNode != null) && (optionalFilterNode != null))  // both filter and outer join, add
        {
            filterForIndexing = new ExprAndNodeImpl();
            filterForIndexing.addChildNode(optionalFilterNode);
            filterForIndexing.addChildNode(outerJoinEqualsNode);
        }
        else if ((outerJoinEqualsNode == null) && (optionalFilterNode != null))
        {
            filterForIndexing = optionalFilterNode;
        }
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                        "} or a plug-in single-row function or script but received '" + hashFuncName + "'");
                }
            }

            // get first parameter
            ExprNode paramExpr = item.getFunction().getParameters().get(0);
            ExprEvaluator eval = paramExpr.getExprEvaluator();
            Class paramType = eval.getType();
            EventPropertyGetter getter;

            if (hashFunction == HashFunctionEnum.CONSISTENT_HASH_CRC32) {
                if (item.getFunction().getParameters().size() > 1 || paramType != String.class) {
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        {
            // Evaluate assignment expression
            StreamTypeService typeService = new StreamTypeServiceImpl(new EventType[0], new String[0], new boolean[0], services.getEngineURI(), false);
            ExprEvaluatorContextStatement evaluatorContextStmt = new ExprEvaluatorContextStatement(statementContext);
            ExprValidationContext validationContext = new ExprValidationContext(typeService, statementContext.getMethodResolutionService(), null, statementContext.getSchedulingService(), statementContext.getVariableService(), evaluatorContextStmt, statementContext.getEventAdapterService(), statementContext.getStatementName(), statementContext.getStatementId(), statementContext.getAnnotations(), statementContext.getContextDescriptor());
            ExprNode validated = ExprNodeUtility.getValidatedSubtree(createDesc.getAssignment(), validationContext);
            value = validated.getExprEvaluator().evaluate(null, true, evaluatorContextStmt);
        }

        // Create variable
        try
        {
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        return raw.getStreamSpecs().get(0).getViewSpecs().get(0).getObjectParameters().get(0);
    }

    public Expression compileExpressionToSODA(String expression) throws EPException
    {
        ExprNode node = compileExpression(expression);
        return StatementSpecMapper.unmap(node);
    }
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Related Classes of com.espertech.esper.epl.expression.ExprNode

  • com.espertech.esper.antlr.ASTUtil
  • com.espertech.esper.core.context.mgr.ContextControllerHashFactory
  • com.espertech.esper.core.EPAdministratorImpl
  • com.espertech.esper.core.service.EPAdministratorImpl
  • com.espertech.esper.core.start.EPPreparedExecuteInsertInto
  • com.espertech.esper.core.start.EPPreparedExecuteSingleStreamUpdate
  • com.espertech.esper.core.start.EPStatementStartMethodCreateVariable
  • com.espertech.esper.dataflow.ops.Filter
  • com.espertech.esper.epl.agg.rollup.GroupByExpressionHelper
  • com.espertech.esper.epl.core.ColumnNamedNodeSwapper
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