com.espertech.esper.pattern

Class EvalRootStateNode

java.lang.Object

com.espertech.esper.pattern.EvalStateNode

com.espertech.esper.pattern.EvalRootStateNode

All Implemented Interfaces:

EvalRootMatchRemover, EvalRootState, Evaluator, PatternStopCallback, StopCallback

public class EvalRootStateNode
extends EvalStateNode
implements Evaluator, PatternStopCallback, EvalRootState

This class is always the root node in the evaluation state tree representing any activated event expression. It hold the handle to a further state node with subnodes making up a whole evaluation state tree.

Field Summary

Fields

Modifier and Type	Field and Description
protected EvalNode	rootSingleChildNode
protected EvalStateNode	topStateNode

Constructor Summary

Constructors

Constructor and Description
EvalRootStateNode(EvalNode rootSingleChildNode) Constructor.

Method Summary

Modifier and Type	Method and Description
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.
EvalStateNode	getTopStateNode()
void	handleChildQuitEvent()
void	handleEvaluateFalseEvent()
void	handleQuitEvent()
boolean	isFilterChildNonQuitting()
boolean	isFilterStateNode()
boolean	isNotOperator()
boolean	isObserverStateNodeNonRestarting()
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	setCallback(PatternMatchCallback callback) Hands the callback to use to indicate matching events.
void	start(MatchedEventMap beginState) Starts the event expression or an instance of it.
void	startRecoverable(boolean startRecoverable, MatchedEventMap beginState)
void	stop() Stops the underlying resources.
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

rootSingleChildNode

protected EvalNode rootSingleChildNode

topStateNode

protected EvalStateNode topStateNode

Constructor Detail

EvalRootStateNode

public EvalRootStateNode(EvalNode rootSingleChildNode)

Constructor.

Parameters:

rootSingleChildNode - is the root nodes single child node

Method Detail

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

setCallback

public final void setCallback(PatternMatchCallback callback)

Hands the callback to use to indicate matching events.

Specified by:

setCallback in interface EvalRootState

Parameters:

callback - is invoked when the event expressions turns true.

startRecoverable

public void startRecoverable(boolean startRecoverable,
                             MatchedEventMap beginState)

Specified by:

startRecoverable in interface EvalRootState

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

Parameters:

beginState - begin state

stop

public final void stop()

Description copied from interface: StopCallback

Stops the underlying resources.

Specified by:

stop in interface StopCallback

quit

public 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

handleQuitEvent

public void handleQuitEvent()

handleChildQuitEvent

public void handleChildQuitEvent()

handleEvaluateFalseEvent

public void handleEvaluateFalseEvent()

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

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

restartable - whether the evaluator can be restarted

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 interface EvalRootState

Specified by:

accept in class EvalStateNode

Parameters:

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

isFilterStateNode

public boolean isFilterStateNode()

Specified by:

isFilterStateNode in class EvalStateNode

isNotOperator

public boolean isNotOperator()

Specified by:

isNotOperator 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 String toString()

Overrides:

toString in class Object

getTopStateNode

public EvalStateNode getTopStateNode()

removeMatch

public void removeMatch(Set<EventBean> matchEvent)

Description copied from class: EvalStateNode

Remove matches that overlap with the provided events.

Specified by:

removeMatch in interface EvalRootMatchRemover

Specified by:

removeMatch in class EvalStateNode

Parameters:

matchEvent - set of events to check for