com.espertech.esper.epl.expression.core
Class ExprIdentNodeEvaluatorContext

java.lang.Object
  com.espertech.esper.epl.expression.core.ExprIdentNodeEvaluatorContext

All Implemented Interfaces:

ExprEvaluator, ExprIdentNodeEvaluator

public class ExprIdentNodeEvaluatorContext
extends java.lang.Object
implements ExprIdentNodeEvaluator

Constructor Summary

ExprIdentNodeEvaluatorContext(int streamNum, java.lang.Class resultType, EventPropertyGetter getter)

Method Summary

java.lang.Object	evaluate(EventBean[] eventsPerStream, boolean isNewData, ExprEvaluatorContext context) Evaluate event tuple and return result.
boolean	evaluatePropertyExists(EventBean[] eventsPerStream, boolean isNewData)
EventPropertyGetter	getGetter()
int	getStreamNum()
java.lang.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

ExprIdentNodeEvaluatorContext

public ExprIdentNodeEvaluatorContext(int streamNum,
                                     java.lang.Class resultType,
                                     EventPropertyGetter getter)

Method Detail

evaluatePropertyExists

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

Specified by:

evaluatePropertyExists in interface ExprIdentNodeEvaluator

getStreamNum

public int getStreamNum()

Specified by:

getStreamNum in interface ExprIdentNodeEvaluator

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.

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

getGetter

public EventPropertyGetter getGetter()

Specified by:

getGetter in interface ExprIdentNodeEvaluator

isContextEvaluated

public boolean isContextEvaluated()

Specified by:

isContextEvaluated in interface ExprIdentNodeEvaluator