com.espertech.esper.pattern

Class EvalObserverStateNode

java.lang.Object

com.espertech.esper.pattern.EvalStateNode

com.espertech.esper.pattern.EvalObserverStateNode

All Implemented Interfaces:

ObserverEventEvaluator

public class EvalObserverStateNode
extends EvalStateNode
implements ObserverEventEvaluator

This class represents the state of an eventObserver sub-expression in the evaluation state tree.

Field Summary

Fields

Modifier and Type	Field and Description
protected EvalObserverNode	evalObserverNode
protected EventObserver	eventObserver

Constructor Summary

Constructors

Constructor and Description
EvalObserverStateNode(Evaluator parentNode, EvalObserverNode evalObserverNode) Constructor.

Method Summary

Modifier and Type	Method and Description
void	accept(EvalStateNodeVisitor visitor) Accept a visitor.
PatternAgentInstanceContext	getContext()
EvalNode	getFactoryNode() Returns the factory node for the state node.
boolean	isFilterStateNode()
boolean	isNotOperator()
boolean	isObserverStateNodeNonRestarting()
void	observerEvaluateFalse(boolean restartable) Indicate that the observer turned permanently false.
void	observerEvaluateTrue(MatchedEventMap matchEvent, boolean quitted) Indicate an event for evaluation (sub-expression the observer represents has turned true).
void	quit() Stops the event expression or an instance of it.
void	removeMatch(Set<EventBean> matchEvent) Remove matches that overlap with the provided events.
void	start(MatchedEventMap beginState) Starts the event expression or an instance of it.
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

evalObserverNode

protected final EvalObserverNode evalObserverNode

eventObserver

protected EventObserver eventObserver

Constructor Detail

EvalObserverStateNode

public EvalObserverStateNode(Evaluator parentNode,
                             EvalObserverNode evalObserverNode)

Constructor.

Parameters:

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

evalObserverNode - is the factory node associated to the state

Method Detail

removeMatch

public void removeMatch(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

getContext

public PatternAgentInstanceContext getContext()

Specified by:

getContext in interface ObserverEventEvaluator

observerEvaluateTrue

public void observerEvaluateTrue(MatchedEventMap matchEvent,
                                 boolean quitted)

Description copied from interface: ObserverEventEvaluator

Indicate an event for evaluation (sub-expression the observer represents has turned true).

Specified by:

observerEvaluateTrue in interface ObserverEventEvaluator

Parameters:

matchEvent - is the matched events so far

quitted - whether the observer quit, usually "true" for most observers

observerEvaluateFalse

public void observerEvaluateFalse(boolean restartable)

Description copied from interface: ObserverEventEvaluator

Indicate that the observer turned permanently false.

Specified by:

observerEvaluateFalse in interface ObserverEventEvaluator

Parameters:

restartable - true for whether it can restart

start

public 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

Parameters:

beginState - begin state

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

isObserverStateNodeNonRestarting

public boolean isObserverStateNodeNonRestarting()

Specified by:

isObserverStateNodeNonRestarting in class EvalStateNode

toString

public final String toString()

Overrides:

toString in class Object