com.espertech.esper.pattern
Class EvalNotStateNode

java.lang.Object
  com.espertech.esper.pattern.EvalStateNode
      com.espertech.esper.pattern.EvalNotStateNode

All Implemented Interfaces:

Evaluator

public class EvalNotStateNode
extends EvalStateNode
implements Evaluator

This class contains the state of an 'not' operator in the evaluation state tree. The not operator inverts the truth of the subexpression under it. It defaults to being true rather than being false at startup. True at startup means it will generate an event on newState such that parent expressions may turn true. It turns permenantly false when it receives an event from a subexpression and the subexpression quitted. It indicates the false state via an evaluateFalse call on its parent evaluator.

Field Summary

protected EvalStateNode	childNode
protected EvalNotNode	evalNotNode

Constructor Summary

EvalNotStateNode(Evaluator parentNode, EvalNotNode evalNotNode)
Constructor.

Method Summary

void	accept(EvalStateNodeVisitor visitor) Accept a visitor.
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.
EvalNode	getFactoryNode() Returns the factory node for the state node.
boolean	isFilterChildNonQuitting()
boolean	isFilterStateNode()
boolean	isNotOperator()
boolean	isObserverStateNodeNonRestarting()
void	quit() Stops the event expression or an instance of it.
void	removeMatch(java.util.Set<EventBean> matchEvent) Remove matches that overlap with the provided events.
void	start(MatchedEventMap beginState) Starts the event expression or an instance of it.
java.lang.String	toString()

Methods inherited from class com.espertech.esper.pattern.EvalStateNode

getParentEvaluator, setParentEvaluator

Methods inherited from class java.lang.Object

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

Field Detail

evalNotNode

protected final EvalNotNode evalNotNode

childNode

protected EvalStateNode childNode

Constructor Detail

EvalNotStateNode

public EvalNotStateNode(Evaluator parentNode,
                        EvalNotNode evalNotNode)

Constructor.

Parameters:

parentNode - is the parent evaluator to call to indicate truth value

evalNotNode - is the factory node associated to the state

Method Detail

removeMatch

public void removeMatch(java.util.Set<EventBean> matchEvent)

Description copied from class: EvalStateNode

Remove matches that overlap with the provided events.

Specified by:

removeMatch in class EvalStateNode

Parameters:

matchEvent - set of events to check for

getFactoryNode

public EvalNode getFactoryNode()

Description copied from class: EvalStateNode

Returns the factory node for the state node.

Specified by:

getFactoryNode in class EvalStateNode

Returns:

factory node

start

public final void start(MatchedEventMap beginState)

Description copied from class: EvalStateNode

Starts the event expression or an instance of it. Child classes are expected to initialize and start any event listeners or schedule any time-based callbacks as needed.

Specified by:

start in class EvalStateNode

evaluateFalse

public final void evaluateFalse(EvalStateNode fromNode,
                                boolean restartable)

Description copied from interface: Evaluator

Indicate a change in truth value to false.

Specified by:

evaluateFalse in interface Evaluator

Parameters:

fromNode - is the node that indicates the change

evaluateTrue

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

Description copied from interface: Evaluator

Indicate a change in truth value to true.

Specified by:

evaluateTrue in interface Evaluator

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

quit

public final void quit()

Description copied from class: EvalStateNode

Stops the event expression or an instance of it. Child classes are expected to free resources and stop any event listeners or remove any time-based callbacks.

Specified by:

quit in class EvalStateNode

accept

public final void accept(EvalStateNodeVisitor visitor)

Description copied from class: EvalStateNode

Accept a visitor. Child classes are expected to invoke the visit method on the visitor instance passed in.

Specified by:

accept in class EvalStateNode

Parameters:

visitor - on which the visit method is invoked by each node

isNotOperator

public boolean isNotOperator()

Specified by:

isNotOperator in class EvalStateNode

isFilterStateNode

public boolean isFilterStateNode()

Specified by:

isFilterStateNode in class EvalStateNode

isFilterChildNonQuitting

public boolean isFilterChildNonQuitting()

Specified by:

isFilterChildNonQuitting in interface Evaluator

isObserverStateNodeNonRestarting

public boolean isObserverStateNodeNonRestarting()

Specified by:

isObserverStateNodeNonRestarting in class EvalStateNode

toString

public final java.lang.String toString()

Overrides:

toString in class java.lang.Object