com.espertech.esper.epl.declexpr
Class ExprDeclaredEvalConstant

java.lang.Object
  com.espertech.esper.epl.declexpr.ExprDeclaredEvalConstant

All Implemented Interfaces:

ExprEvaluator

public class ExprDeclaredEvalConstant
extends java.lang.Object
implements ExprEvaluator

Constructor Summary

ExprDeclaredEvalConstant(java.lang.Class returnType, ExpressionDeclItem prototype, java.lang.Object value)

Method Summary

java.lang.Object	evaluate(EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext context) Evaluate event tuple and return result.
java.lang.Class	getType() Returns the type that the node's evaluate method returns an instance of.

Methods inherited from class java.lang.Object

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

Constructor Detail

ExprDeclaredEvalConstant

public ExprDeclaredEvalConstant(java.lang.Class returnType,
                                ExpressionDeclItem prototype,
                                java.lang.Object value)

Method Detail

getType

public java.lang.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

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.