org.wso2.siddhi.core.executor

Class VariableExpressionExecutor

java.lang.Object

org.wso2.siddhi.core.executor.VariableExpressionExecutor

All Implemented Interfaces:

ExpressionExecutor

public class VariableExpressionExecutor
extends Object
implements ExpressionExecutor

Executor class for Siddhi event attributes. This executor is used to extract attribute value from ComplexEvent.

Constructor Summary

Constructors

Constructor and Description
VariableExpressionExecutor(org.wso2.siddhi.query.api.definition.Attribute attribute, int streamEventChainIndex, int streamEventIndexInChain)

Method Summary

Modifier and Type	Method and Description
ExpressionExecutor	cloneExecutor(String key)
Object	execute(ComplexEvent event)
org.wso2.siddhi.query.api.definition.Attribute	getAttribute()
int[]	getPosition()
org.wso2.siddhi.query.api.definition.Attribute.Type	getReturnType()
void	setAttribute(org.wso2.siddhi.query.api.definition.Attribute attribute)
void	setPosition(int[] position) Method to set the position of variable to be executed.

Methods inherited from class java.lang.Object

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

Constructor Detail

VariableExpressionExecutor

public VariableExpressionExecutor(org.wso2.siddhi.query.api.definition.Attribute attribute,
                                  int streamEventChainIndex,
                                  int streamEventIndexInChain)

Method Detail

execute

public Object execute(ComplexEvent event)

Specified by:

execute in interface ExpressionExecutor

getReturnType

public org.wso2.siddhi.query.api.definition.Attribute.Type getReturnType()

Specified by:

getReturnType in interface ExpressionExecutor

cloneExecutor

public ExpressionExecutor cloneExecutor(String key)

Specified by:

cloneExecutor in interface ExpressionExecutor

getAttribute

public org.wso2.siddhi.query.api.definition.Attribute getAttribute()

setAttribute

public void setAttribute(org.wso2.siddhi.query.api.definition.Attribute attribute)

getPosition

public int[] getPosition()

setPosition

public void setPosition(int[] position)

Method to set the position of variable to be executed. For stream events(simple queries) position can be an array of size 2 and for state events(join/pattern queries) position should be an array of size 4.

Parameters:

position - attribute position