com.espertech.esper.epl.expression.core

Class ExprIdentNodeEvaluatorImpl

java.lang.Object

com.espertech.esper.epl.expression.core.ExprIdentNodeEvaluatorImpl

All Implemented Interfaces:

ExprEvaluator, ExprIdentNodeEvaluator

Direct Known Subclasses:

ExprIdentNodeEvaluatorLogging

public class ExprIdentNodeEvaluatorImpl
extends Object
implements ExprIdentNodeEvaluator

Field Summary

Fields

Modifier and Type	Field and Description
protected Class	returnType

Constructor Summary

Constructors

Constructor and Description
ExprIdentNodeEvaluatorImpl(int streamNum, EventPropertyGetterSPI propertyGetter, Class returnType, ExprIdentNode identNode)

Method Summary

Modifier and Type	Method and Description
CodegenExpression	codegen(CodegenParamSetExprPremade params, CodegenContext context)
Object	evaluate(EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext exprEvaluatorContext) Evaluate event tuple and return result.
boolean	evaluatePropertyExists(EventBean[] eventsPerStream, boolean isNewData) Returns true if the property exists, or false if not.
Class	getEvaluationType()
EventPropertyGetterSPI	getGetter()
int	getStreamNum()
boolean	isContextEvaluated()

Methods inherited from class java.lang.Object

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

Field Detail

returnType

protected final Class returnType

Constructor Detail

ExprIdentNodeEvaluatorImpl

public ExprIdentNodeEvaluatorImpl(int streamNum,
                                  EventPropertyGetterSPI propertyGetter,
                                  Class returnType,
                                  ExprIdentNode identNode)

Method Detail

evaluate

public Object evaluate(EventBean[] eventsPerStream,
                       boolean isNewData,
                       ExprEvaluatorContext exprEvaluatorContext)

Description copied from interface: ExprEvaluator

Evaluate event tuple and return result.

Specified by:

evaluate in interface ExprEvaluator

Parameters:

eventsPerStream - - event tuple

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

exprEvaluatorContext - context for expression evaluation

Returns:

evaluation result, a boolean value for OR/AND-type evalution nodes.

codegen

public CodegenExpression codegen(CodegenParamSetExprPremade params,
                                 CodegenContext context)

Specified by:

codegen in interface ExprIdentNodeEvaluator

getEvaluationType

public Class getEvaluationType()

Specified by:

getEvaluationType in interface ExprIdentNodeEvaluator

getGetter

public EventPropertyGetterSPI getGetter()

Specified by:

getGetter in interface ExprIdentNodeEvaluator

evaluatePropertyExists

public boolean evaluatePropertyExists(EventBean[] eventsPerStream,
                                      boolean isNewData)

Returns true if the property exists, or false if not.

Specified by:

evaluatePropertyExists in interface ExprIdentNodeEvaluator

Parameters:

eventsPerStream - each stream's events

isNewData - if the stream represents insert or remove stream

Returns:

true if the property exists, false if not

getStreamNum

public int getStreamNum()

Specified by:

getStreamNum in interface ExprIdentNodeEvaluator

isContextEvaluated

public boolean isContextEvaluated()

Specified by:

isContextEvaluated in interface ExprIdentNodeEvaluator