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

Constructor Summary

Constructors

Constructor and Description
ExprIdentNodeEvaluatorImpl(int streamNum, EventPropertyGetter propertyGetter, Class propertyType, ExprIdentNode identNode)

Method Summary

Modifier and Type	Method and Description
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.
EventPropertyGetter	getGetter()
int	getStreamNum()
Class	getType() Returns the type that the node's evaluate method returns an instance of.
boolean	isContextEvaluated()

Methods inherited from class java.lang.Object

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

Constructor Detail

ExprIdentNodeEvaluatorImpl

public ExprIdentNodeEvaluatorImpl(int streamNum,
                                  EventPropertyGetter propertyGetter,
                                  Class propertyType,
                                  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.

getType

public Class getType()

Description copied from interface: ExprEvaluator

Returns the type that the node's evaluate method returns an instance of.

Specified by:

getType in interface ExprEvaluator

Returns:

type returned when evaluated

getGetter

public EventPropertyGetter 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