com.espertech.esper.epl.property
Interface PropertyEvaluator

All Known Implementing Classes:

PropertyEvaluatorNested, PropertyEvaluatorSelect, PropertyEvaluatorSimple

public interface PropertyEvaluator

Interface for a function that evaluates the properties of an event and returns event representing the properties.

Method Summary

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.

Method Detail

getProperty

EventBean[] getProperty(EventBean theEvent,
                        ExprEvaluatorContext exprEvaluatorContext)

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

Parameters:

theEvent - to inspect

exprEvaluatorContext - expression evaluation context

Returns:

events representing property(s)

getFragmentEventType

EventType getFragmentEventType()

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

Returns:

result event type

compareTo

boolean compareTo(PropertyEvaluator otherFilterPropertyEval)

Compare to another property evaluator.

Parameters:

otherFilterPropertyEval - other

Returns:

equals or not