com.espertech.esper.epl.core.select

Class SelectExprResultProcessor

java.lang.Object

com.espertech.esper.epl.core.select.SelectExprResultProcessor

All Implemented Interfaces:

SelectExprProcessor, SelectExprProcessorForge

public class SelectExprResultProcessor
extends java.lang.Object
implements SelectExprProcessor, SelectExprProcessorForge

A select expression processor that check what type of result (synthetic and natural) event is expected and produces.

Constructor Summary

Constructors

Constructor and Description
SelectExprResultProcessor(StatementResultService statementResultService, SelectExprProcessorForge syntheticProcessor, BindProcessorForge bindProcessorForge) Ctor.

Method Summary

Modifier and Type	Method and Description
EventType	getResultEventType() Returns the event type that represents the select-clause items.
SelectExprProcessor	getSelectExprProcessor(EngineImportService engineImportService, boolean isFireAndForget, java.lang.String statementName)
EventBean	process(EventBean[] eventsPerStream, boolean isNewData, boolean isSynthesize, ExprEvaluatorContext exprEvaluatorContext) Computes the select-clause results and returns an event of the result event type that contains, in it's properties, the selected items.
CodegenMethodNode	processCodegen(CodegenMember memberResultEventType, CodegenMember memberEventAdapterService, CodegenMethodScope codegenMethodScope, SelectExprProcessorCodegenSymbol selectSymbol, ExprForgeCodegenSymbol exprSymbol, CodegenClassScope codegenClassScope)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SelectExprResultProcessor

public SelectExprResultProcessor(StatementResultService statementResultService,
                                 SelectExprProcessorForge syntheticProcessor,
                                 BindProcessorForge bindProcessorForge)

Ctor.

Parameters:

statementResultService - for awareness of listeners and subscribers handles output results

syntheticProcessor - is the processor generating synthetic events according to the select clause

bindProcessorForge - for generating natural object column results

Method Detail

getSelectExprProcessor

public SelectExprProcessor getSelectExprProcessor(EngineImportService engineImportService,
                                                  boolean isFireAndForget,
                                                  java.lang.String statementName)

Specified by:

getSelectExprProcessor in interface SelectExprProcessorForge

getResultEventType

public EventType getResultEventType()

Description copied from interface: SelectExprProcessorForge

Returns the event type that represents the select-clause items.

Specified by:

getResultEventType in interface SelectExprProcessorForge

Returns:

event type representing select-clause items

process

public EventBean process(EventBean[] eventsPerStream,
                         boolean isNewData,
                         boolean isSynthesize,
                         ExprEvaluatorContext exprEvaluatorContext)

Description copied from interface: SelectExprProcessor

Computes the select-clause results and returns an event of the result event type that contains, in it's properties, the selected items.

Specified by:

process in interface SelectExprProcessor

Parameters:

eventsPerStream - - is per stream the event

isNewData - - indicates whether we are dealing with new data (istream) or old data (rstream)

isSynthesize - - set to true to indicate that synthetic events are required for an iterator result set

exprEvaluatorContext - context

Returns:

event with properties containing selected items

processCodegen

public CodegenMethodNode processCodegen(CodegenMember memberResultEventType,
                                        CodegenMember memberEventAdapterService,
                                        CodegenMethodScope codegenMethodScope,
                                        SelectExprProcessorCodegenSymbol selectSymbol,
                                        ExprForgeCodegenSymbol exprSymbol,
                                        CodegenClassScope codegenClassScope)

Specified by:

processCodegen in interface SelectExprProcessorForge