com.espertech.esper.epl.property

Class PropertyEvaluatorSelect

java.lang.Object

com.espertech.esper.epl.property.PropertyEvaluatorSelect

All Implemented Interfaces:

PropertyEvaluator

public class PropertyEvaluatorSelect
extends Object
implements PropertyEvaluator

Property evaluator that considers a select-clauses and relies on an accumulative property evaluator that presents events for all columns and rows.

Constructor Summary

Constructors

Constructor and Description
PropertyEvaluatorSelect(SelectExprProcessor selectExprProcessor, PropertyEvaluatorAccumulative accumulative) Ctor.

Method Summary

Modifier and Type	Method and Description
boolean	compareTo(PropertyEvaluator otherFilterPropertyEval) Compare to another property evaluator.
EventType	getFragmentEventType() Returns the result type of the events generated by evaluating a property expression.
EventBean[]	getProperty(EventBean theEvent, ExprEvaluatorContext exprEvaluatorContext) Returns the result events based on property values, or null if none found.

Methods inherited from class java.lang.Object

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

Constructor Detail

PropertyEvaluatorSelect

public PropertyEvaluatorSelect(SelectExprProcessor selectExprProcessor,
                               PropertyEvaluatorAccumulative accumulative)

Ctor.

Parameters:

selectExprProcessor - evaluates the select clause

accumulative - provides property events for input events

Method Detail

getProperty

public EventBean[] getProperty(EventBean theEvent,
                               ExprEvaluatorContext exprEvaluatorContext)

Description copied from interface: PropertyEvaluator

Returns the result events based on property values, or null if none found.

Specified by:

getProperty in interface PropertyEvaluator

Parameters:

theEvent - to inspect

exprEvaluatorContext - expression evaluation context

Returns:

events representing property(s)

getFragmentEventType

public EventType getFragmentEventType()

Description copied from interface: PropertyEvaluator

Returns the result type of the events generated by evaluating a property expression.

Specified by:

getFragmentEventType in interface PropertyEvaluator

Returns:

result event type

compareTo

public boolean compareTo(PropertyEvaluator otherFilterPropertyEval)

Description copied from interface: PropertyEvaluator

Compare to another property evaluator.

Specified by:

compareTo in interface PropertyEvaluator

Parameters:

otherFilterPropertyEval - other

Returns:

equals or not