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java.lang.Objectnet.esper.pattern.EvalStateNode
net.esper.pattern.EvalNotStateNode
public final class EvalNotStateNode
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.
Constructor Summary | |
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EvalNotStateNode(Evaluator parentNode,
EvalNotNode evalNotNode,
MatchedEventMap beginState,
PatternContext context)
Constructor. |
Method Summary | |
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Object |
accept(EvalStateNodeVisitor visitor,
Object data)
Accept a visitor. |
Object |
childrenAccept(EvalStateNodeVisitor visitor,
Object data)
Pass the visitor to all child nodes. |
void |
evaluateFalse(EvalStateNode fromNode)
Indicate a change in truth value to false. |
void |
evaluateTrue(MatchedEventMap matchEvent,
EvalStateNode fromNode,
boolean isQuitted)
Indicate a change in truth value to true. |
void |
quit()
Stops the event expression or an instance of it. |
void |
start()
Starts the event expression or an instance of it. |
String |
toString()
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Methods inherited from class net.esper.pattern.EvalStateNode |
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getFactoryNode, getParentEvaluator, getStateObjectId, setParentEvaluator |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public EvalNotStateNode(Evaluator parentNode, EvalNotNode evalNotNode, MatchedEventMap beginState, PatternContext context)
parentNode
- is the parent evaluator to call to indicate truth valuebeginState
- contains the events that make up prior matchescontext
- contains handles to services requiredevalNotNode
- is the factory node associated to the stateMethod Detail |
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public final void start()
EvalStateNode
start
in class EvalStateNode
public final void evaluateFalse(EvalStateNode fromNode)
Evaluator
evaluateFalse
in interface Evaluator
fromNode
- is the node that indicates the changepublic final void evaluateTrue(MatchedEventMap matchEvent, EvalStateNode fromNode, boolean isQuitted)
Evaluator
evaluateTrue
in interface Evaluator
matchEvent
- is the container for events that caused the change in truth valuefromNode
- is the node that indicates the changeisQuitted
- is an indication of whether the node continues listenening or stops listeningpublic final void quit()
EvalStateNode
quit
in class EvalStateNode
public final Object accept(EvalStateNodeVisitor visitor, Object data)
EvalStateNode
accept
in class EvalStateNode
visitor
- on which the visit method is invoked by each nodedata
- any additional data the visitor may need is passed in this parameter
public final Object childrenAccept(EvalStateNodeVisitor visitor, Object data)
EvalStateNode
childrenAccept
in class EvalStateNode
visitor
- is the instance to be passed to all child nodesdata
- any additional data the visitor may need is passed in this parameter
public final String toString()
toString
in class Object
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