com.espertech.esper.pattern

Interface Evaluator

All Known Implementing Classes:

EvalAndStateNode, EvalAuditStateNode, EvalEveryDistinctStateExpireKeyNode, EvalEveryDistinctStateNode, EvalEveryStateNode, EvalEveryStateSpawnEvaluator, EvalFollowedByStateNode, EvalFollowedByWithMaxStateNodeManaged, EvalGuardStateNode, EvalMatchUntilStateNode, EvalNotStateNode, EvalOrStateNode, EvalRootStateNode

public interface Evaluator

Interface for nodes in an expression evaluation state tree that are being informed by a child that the event expression fragments (subtrees) which the child represents has turned true (evaluateTrue method) or false (evaluateFalse).

Method Summary

Modifier and Type	Method and Description
void	evaluateFalse(EvalStateNode fromNode, boolean restartable) Indicate a change in truth value to false.
void	evaluateTrue(MatchedEventMap matchEvent, EvalStateNode fromNode, boolean isQuitted) Indicate a change in truth value to true.
boolean	isFilterChildNonQuitting()

Method Detail

evaluateTrue

void evaluateTrue(MatchedEventMap matchEvent,
                  EvalStateNode fromNode,
                  boolean isQuitted)

Indicate a change in truth value to true.

Parameters:

matchEvent - is the container for events that caused the change in truth value

fromNode - is the node that indicates the change

isQuitted - is an indication of whether the node continues listenening or stops listening

evaluateFalse

void evaluateFalse(EvalStateNode fromNode,
                   boolean restartable)

Indicate a change in truth value to false.

Parameters:

fromNode - is the node that indicates the change

restartable - whether the evaluator can be restarted

isFilterChildNonQuitting

boolean isFilterChildNonQuitting()