com.espertech.esper.epl.expression.core

Class ExprEvaluatorNull

java.lang.Object

com.espertech.esper.epl.expression.core.ExprEvaluatorNull

All Implemented Interfaces:

ExprEvaluator

public class ExprEvaluatorNull
extends java.lang.Object
implements ExprEvaluator

Field Summary

Fields

Modifier and Type	Field and Description
static ExprEvaluatorNull	INSTANCE

Method Summary

Modifier and Type	Method and Description
java.lang.Object	evaluate(EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext context) Evaluate event tuple and return result.

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final ExprEvaluatorNull INSTANCE

Method Detail

evaluate

public java.lang.Object evaluate(EventBean[] eventsPerStream,
                                 boolean isNewData,
                                 ExprEvaluatorContext context)

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)

context - context for expression evaluation

Returns:

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